2215 lines
78 KiB
C
2215 lines
78 KiB
C
/**********************************************************************************************
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*
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* rlgl - raylib OpenGL abstraction layer
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*
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* raylib now uses OpenGL 1.1 style functions (rlVertex) that are mapped to selected OpenGL version:
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* OpenGL 1.1 - Direct map rl* -> gl*
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* OpenGL 3.3+ - Vertex data is stored in VAOs, call rlglDraw() to render
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* OpenGL ES 2 - Same behaviour as OpenGL 3.3+
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*
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* Copyright (c) 2014 Ramon Santamaria (Ray San - raysan@raysanweb.com)
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*
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* This software is provided "as-is", without any express or implied warranty. In no event
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* will the authors be held liable for any damages arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose, including commercial
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* applications, and to alter it and redistribute it freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not claim that you
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* wrote the original software. If you use this software in a product, an acknowledgment
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* in the product documentation would be appreciated but is not required.
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*
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* 2. Altered source versions must be plainly marked as such, and must not be misrepresented
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* as being the original software.
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*
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* 3. This notice may not be removed or altered from any source distribution.
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*
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**********************************************************************************************/
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#include "rlgl.h"
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#include <stdio.h> // Standard input / output lib
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#include <stdlib.h> // Declares malloc() and free() for memory management, rand()
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#if defined(GRAPHICS_API_OPENGL_11)
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#ifdef __APPLE__ // OpenGL include for OSX
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#include <OpenGL/gl.h>
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#else
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#include <GL/gl.h> // Basic OpenGL include
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#endif
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#endif
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#if defined(GRAPHICS_API_OPENGL_33)
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#define GLEW_STATIC
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#ifdef __APPLE__ // OpenGL include for OSX
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#include <OpenGL/gl3.h>
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#else
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#include <GL/glew.h> // Extensions loading lib
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//#include "glad.h" // TODO: Other extensions loading lib? --> REVIEW
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#endif
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#endif
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#if defined(GRAPHICS_API_OPENGL_ES2)
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#include <EGL/egl.h>
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#include <GLES2/gl2.h>
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#include <GLES2/gl2ext.h>
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#endif
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//----------------------------------------------------------------------------------
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// Defines and Macros
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//----------------------------------------------------------------------------------
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#define MATRIX_STACK_SIZE 16 // Matrix stack max size
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#define MAX_DRAWS_BY_TEXTURE 256 // Draws are organized by texture changes
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#define TEMP_VERTEX_BUFFER_SIZE 4096 // Temporal Vertex Buffer (required for vertex-transformations)
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// NOTE: Every vertex are 3 floats (12 bytes)
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//----------------------------------------------------------------------------------
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// Types and Structures Definition
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//----------------------------------------------------------------------------------
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// Vertex buffer (position + color arrays)
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// NOTE: Used for lines and triangles VAOs
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typedef struct {
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int vCounter;
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int cCounter;
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float *vertices; // 3 components per vertex
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unsigned char *colors; // 4 components per vertex
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} VertexPositionColorBuffer;
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// Vertex buffer (position + texcoords + color arrays)
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// NOTE: Not used
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typedef struct {
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int vCounter;
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int tcCounter;
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int cCounter;
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float *vertices; // 3 components per vertex
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float *texcoords; // 2 components per vertex
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unsigned char *colors; // 4 components per vertex
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} VertexPositionColorTextureBuffer;
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// Vertex buffer (position + texcoords + normals arrays)
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// NOTE: Not used
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typedef struct {
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int vCounter;
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int tcCounter;
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int nCounter;
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float *vertices; // 3 components per vertex
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float *texcoords; // 2 components per vertex
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float *normals; // 3 components per vertex
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//short *normals; // NOTE: Less data load... but padding issues and normalizing required!
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} VertexPositionTextureNormalBuffer;
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// Vertex buffer (position + texcoords + colors + indices arrays)
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// NOTE: Used for quads VAO
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typedef struct {
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int vCounter;
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int tcCounter;
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int cCounter;
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float *vertices; // 3 components per vertex
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float *texcoords; // 2 components per vertex
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unsigned char *colors; // 4 components per vertex
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#if defined(GRAPHICS_API_OPENGL_11) || defined(GRAPHICS_API_OPENGL_33)
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unsigned int *indices; // 6 indices per quad (could be int)
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#elif defined(GRAPHICS_API_OPENGL_ES2)
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unsigned short *indices; // 6 indices per quad (must be short)
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// NOTE: 6*2 byte = 12 byte, not alignment problem!
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#endif
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} VertexPositionColorTextureIndexBuffer;
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// Draw call type
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// NOTE: Used to track required draw-calls, organized by texture
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typedef struct {
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GLuint textureId;
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int vertexCount;
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} DrawCall;
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// pixel type (same as Color type)
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// NOTE: Used exclusively in mipmap generation functions
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typedef struct {
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unsigned char r;
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unsigned char g;
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unsigned char b;
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unsigned char a;
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} pixel;
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//----------------------------------------------------------------------------------
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// Global Variables Definition
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//----------------------------------------------------------------------------------
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#if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
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static Matrix stack[MATRIX_STACK_SIZE];
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static int stackCounter = 0;
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static Matrix modelview;
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static Matrix projection;
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static Matrix *currentMatrix;
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static int currentMatrixMode;
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static DrawMode currentDrawMode;
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// Vertex arrays for lines, triangles and quads
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static VertexPositionColorBuffer lines; // No texture support
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static VertexPositionColorBuffer triangles; // No texture support
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static VertexPositionColorTextureIndexBuffer quads;
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// Vetex-Fragment Shader Program ID
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static GLuint defaultShaderProgram, simpleShaderProgram;
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// Default Shader program attibutes binding locations
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static GLuint defaultVertexLoc, defaultTexcoordLoc, defaultColorLoc;
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static GLuint defaultProjectionMatrixLoc, defaultModelviewMatrixLoc;
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static GLuint defaultTextureLoc;
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// Simple Shader program attibutes binding locations
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static GLuint simpleVertexLoc, simpleTexcoordLoc, simpleNormalLoc, simpleColorLoc;
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static GLuint simpleProjectionMatrixLoc, simpleModelviewMatrixLoc;
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static GLuint simpleTextureLoc;
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// Vertex Array Objects (VAO)
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static GLuint vaoLines, vaoTriangles, vaoQuads;
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// Vertex Buffer Objects (VBO)
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static GLuint linesBuffer[2];
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static GLuint trianglesBuffer[2];
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static GLuint quadsBuffer[4];
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static DrawCall *draws;
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static int drawsCounter;
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// Temp vertex buffer to be used with rlTranslate, rlRotate, rlScale
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static Vector3 *tempBuffer;
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static int tempBufferCount = 0;
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static bool useTempBuffer = false;
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// Support for VAOs (OpenGL ES2 could not support VAO extensions)
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static bool vaoSupported = false;
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#endif
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#if defined(GRAPHICS_API_OPENGL_ES2)
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// NOTE: VAO functionality is exposed through extensions (OES)
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// emscripten does not support VAOs
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static PFNGLGENVERTEXARRAYSOESPROC glGenVertexArrays;
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static PFNGLBINDVERTEXARRAYOESPROC glBindVertexArray;
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static PFNGLDELETEVERTEXARRAYSOESPROC glDeleteVertexArrays;
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static PFNGLISVERTEXARRAYOESPROC glIsVertexArray;
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#endif
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// White texture useful for plain color polys (required by shader)
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// NOTE: It's required in shapes and models modules!
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unsigned int whiteTexture;
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//----------------------------------------------------------------------------------
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// Module specific Functions Declaration
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//----------------------------------------------------------------------------------
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#if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
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static GLuint LoadDefaultShader(void);
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static GLuint LoadSimpleShader(void);
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static void InitializeBuffers(void);
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static void InitializeBuffersGPU(void);
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static void UpdateBuffers(void);
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// Custom shader files loading (external)
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static GLuint LoadCustomShader(char *vertexFileName, char *fragmentFileName);
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static char *TextFileRead(char *fn);
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#endif
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#if defined(GRAPHICS_API_OPENGL_11)
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static int GenerateMipmaps(unsigned char *data, int baseWidth, int baseHeight);
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static pixel *GenNextMipmap(pixel *srcData, int srcWidth, int srcHeight);
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#endif
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//----------------------------------------------------------------------------------
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// Module Functions Definition - Matrix operations
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//----------------------------------------------------------------------------------
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#if defined(GRAPHICS_API_OPENGL_11)
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// Fallback to OpenGL 1.1 function calls
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//---------------------------------------
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void rlMatrixMode(int mode)
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{
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switch (mode)
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{
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case RL_PROJECTION: glMatrixMode(GL_PROJECTION); break;
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case RL_MODELVIEW: glMatrixMode(GL_MODELVIEW); break;
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case RL_TEXTURE: glMatrixMode(GL_TEXTURE); break;
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default: break;
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}
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}
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void rlFrustum(double left, double right, double bottom, double top, double near, double far)
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{
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glFrustum(left, right, bottom, top, near, far);
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}
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void rlOrtho(double left, double right, double bottom, double top, double near, double far)
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{
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glOrtho(left, right, bottom, top, near, far);
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}
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void rlPushMatrix(void) { glPushMatrix(); }
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void rlPopMatrix(void) { glPopMatrix(); }
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void rlLoadIdentity(void) { glLoadIdentity(); }
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void rlTranslatef(float x, float y, float z) { glTranslatef(x, y, z); }
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void rlRotatef(float angleDeg, float x, float y, float z) { glRotatef(angleDeg, x, y, z); }
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void rlScalef(float x, float y, float z) { glScalef(x, y, z); }
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void rlMultMatrixf(float *mat) { glMultMatrixf(mat); }
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#elif defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
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// Choose the current matrix to be transformed
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void rlMatrixMode(int mode)
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{
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if (mode == RL_PROJECTION) currentMatrix = &projection;
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else if (mode == RL_MODELVIEW) currentMatrix = &modelview;
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//else if (mode == RL_TEXTURE) // Not supported
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currentMatrixMode = mode;
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}
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// Push the current matrix to stack
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void rlPushMatrix(void)
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{
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if (stackCounter == MATRIX_STACK_SIZE - 1)
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{
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TraceLog(ERROR, "Stack Buffer Overflow (MAX %i Matrix)", MATRIX_STACK_SIZE);
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}
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stack[stackCounter] = *currentMatrix;
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rlLoadIdentity();
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stackCounter++;
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if (currentMatrixMode == RL_MODELVIEW) useTempBuffer = true;
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}
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// Pop lattest inserted matrix from stack
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void rlPopMatrix(void)
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{
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if (stackCounter > 0)
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{
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Matrix mat = stack[stackCounter - 1];
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*currentMatrix = mat;
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stackCounter--;
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}
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}
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// Reset current matrix to identity matrix
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void rlLoadIdentity(void)
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{
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*currentMatrix = MatrixIdentity();
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}
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// Multiply the current matrix by a translation matrix
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void rlTranslatef(float x, float y, float z)
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{
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Matrix mat = MatrixTranslate(x, y, z);
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MatrixTranspose(&mat);
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*currentMatrix = MatrixMultiply(*currentMatrix, mat);
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}
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// Multiply the current matrix by a rotation matrix
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void rlRotatef(float angleDeg, float x, float y, float z)
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{
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// TODO: Support rotation in multiple axes
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Matrix rot = MatrixIdentity();
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// OPTION 1: It works...
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if (x == 1) rot = MatrixRotateX(angleDeg*DEG2RAD);
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else if (y == 1) rot = MatrixRotateY(angleDeg*DEG2RAD);
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else if (z == 1) rot = MatrixRotateZ(angleDeg*DEG2RAD);
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// OPTION 2: Requires review...
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//Vector3 vec = (Vector3){ 0, 1, 0 };
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//VectorNormalize(&vec);
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//rot = MatrixFromAxisAngle(vec, angleDeg*DEG2RAD); // Working?
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// OPTION 3: TODO: Review, it doesn't work!
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//Vector3 vec = (Vector3){ x, y, z };
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//VectorNormalize(&vec);
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//rot = MatrixRotate(angleDeg*vec.x, angleDeg*vec.x, angleDeg*vec.x);
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MatrixTranspose(&rot);
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*currentMatrix = MatrixMultiply(*currentMatrix, rot);
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}
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// Multiply the current matrix by a scaling matrix
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void rlScalef(float x, float y, float z)
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{
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Matrix mat = MatrixScale(x, y, z);
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MatrixTranspose(&mat);
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*currentMatrix = MatrixMultiply(*currentMatrix, mat);
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}
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// Multiply the current matrix by another matrix
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void rlMultMatrixf(float *m)
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{
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// TODO: review Matrix creation from array
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Matrix mat = { m[0], m[1], m[2], m[3],
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m[4], m[5], m[6], m[7],
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m[8], m[9], m[10], m[11],
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m[12], m[13], m[14], m[15] };
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*currentMatrix = MatrixMultiply(*currentMatrix, mat);
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}
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// Multiply the current matrix by a perspective matrix generated by parameters
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void rlFrustum(double left, double right, double bottom, double top, double near, double far)
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{
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Matrix matPerps = MatrixFrustum(left, right, bottom, top, near, far);
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MatrixTranspose(&matPerps);
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*currentMatrix = MatrixMultiply(*currentMatrix, matPerps);
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}
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// Multiply the current matrix by an orthographic matrix generated by parameters
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void rlOrtho(double left, double right, double bottom, double top, double near, double far)
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{
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Matrix matOrtho = MatrixOrtho(left, right, bottom, top, near, far);
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MatrixTranspose(&matOrtho);
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*currentMatrix = MatrixMultiply(*currentMatrix, matOrtho);
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}
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#endif
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//----------------------------------------------------------------------------------
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// Module Functions Definition - Vertex level operations
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//----------------------------------------------------------------------------------
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#if defined(GRAPHICS_API_OPENGL_11)
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// Fallback to OpenGL 1.1 function calls
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//---------------------------------------
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void rlBegin(int mode)
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{
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switch (mode)
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{
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case RL_LINES: glBegin(GL_LINES); break;
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case RL_TRIANGLES: glBegin(GL_TRIANGLES); break;
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case RL_QUADS: glBegin(GL_QUADS); break;
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default: break;
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}
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}
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void rlEnd() { glEnd(); }
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void rlVertex2i(int x, int y) { glVertex2i(x, y); }
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void rlVertex2f(float x, float y) { glVertex2f(x, y); }
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void rlVertex3f(float x, float y, float z) { glVertex3f(x, y, z); }
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void rlTexCoord2f(float x, float y) { glTexCoord2f(x, y); }
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void rlNormal3f(float x, float y, float z) { glNormal3f(x, y, z); }
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void rlColor4ub(byte r, byte g, byte b, byte a) { glColor4ub(r, g, b, a); }
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void rlColor3f(float x, float y, float z) { glColor3f(x, y, z); }
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void rlColor4f(float x, float y, float z, float w) { glColor4f(x, y, z, w); }
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#elif defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
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// Initialize drawing mode (how to organize vertex)
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void rlBegin(int mode)
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{
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// Draw mode can only be RL_LINES, RL_TRIANGLES and RL_QUADS
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currentDrawMode = mode;
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}
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// Finish vertex providing
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void rlEnd(void)
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{
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if (useTempBuffer)
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{
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// NOTE: In this case, *currentMatrix is already transposed because transposing has been applied
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// independently to translation-scale-rotation matrices -> t(M1 x M2) = t(M2) x t(M1)
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// This way, rlTranslatef(), rlRotatef()... behaviour is the same than OpenGL 1.1
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// Apply transformation matrix to all temp vertices
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for (int i = 0; i < tempBufferCount; i++) VectorTransform(&tempBuffer[i], *currentMatrix);
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// Deactivate tempBuffer usage to allow rlVertex3f do its job
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useTempBuffer = false;
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// Copy all transformed vertices to right VAO
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for (int i = 0; i < tempBufferCount; i++) rlVertex3f(tempBuffer[i].x, tempBuffer[i].y, tempBuffer[i].z);
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// Reset temp buffer
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tempBufferCount = 0;
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}
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// Make sure vertexCount is the same for vertices-texcoords-normals-colors
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// NOTE: In OpenGL 1.1, one glColor call can be made for all the subsequent glVertex calls.
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switch (currentDrawMode)
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{
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case RL_LINES:
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{
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if (lines.vCounter != lines.cCounter)
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{
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int addColors = lines.vCounter - lines.cCounter;
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for (int i = 0; i < addColors; i++)
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{
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lines.colors[4*lines.cCounter] = lines.colors[4*lines.cCounter - 4];
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lines.colors[4*lines.cCounter + 1] = lines.colors[4*lines.cCounter - 3];
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lines.colors[4*lines.cCounter + 2] = lines.colors[4*lines.cCounter - 2];
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lines.colors[4*lines.cCounter + 3] = lines.colors[4*lines.cCounter - 1];
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lines.cCounter++;
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}
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}
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} break;
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case RL_TRIANGLES:
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{
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if (triangles.vCounter != triangles.cCounter)
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{
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int addColors = triangles.vCounter - triangles.cCounter;
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for (int i = 0; i < addColors; i++)
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{
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triangles.colors[4*triangles.cCounter] = triangles.colors[4*triangles.cCounter - 4];
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triangles.colors[4*triangles.cCounter + 1] = triangles.colors[4*triangles.cCounter - 3];
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triangles.colors[4*triangles.cCounter + 2] = triangles.colors[4*triangles.cCounter - 2];
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triangles.colors[4*triangles.cCounter + 3] = triangles.colors[4*triangles.cCounter - 1];
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triangles.cCounter++;
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}
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}
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} break;
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case RL_QUADS:
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{
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// Make sure colors count match vertex count
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if (quads.vCounter != quads.cCounter)
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{
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int addColors = quads.vCounter - quads.cCounter;
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for (int i = 0; i < addColors; i++)
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{
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quads.colors[4*quads.cCounter] = quads.colors[4*quads.cCounter - 4];
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quads.colors[4*quads.cCounter + 1] = quads.colors[4*quads.cCounter - 3];
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quads.colors[4*quads.cCounter + 2] = quads.colors[4*quads.cCounter - 2];
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quads.colors[4*quads.cCounter + 3] = quads.colors[4*quads.cCounter - 1];
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quads.cCounter++;
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}
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}
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// Make sure texcoords count match vertex count
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|
if (quads.vCounter != quads.tcCounter)
|
|
{
|
|
int addTexCoords = quads.vCounter - quads.tcCounter;
|
|
|
|
for (int i = 0; i < addTexCoords; i++)
|
|
{
|
|
quads.texcoords[2*quads.tcCounter] = 0.0f;
|
|
quads.texcoords[2*quads.tcCounter + 1] = 0.0f;
|
|
|
|
quads.tcCounter++;
|
|
}
|
|
}
|
|
|
|
// TODO: Make sure normals count match vertex count
|
|
|
|
} break;
|
|
default: break;
|
|
}
|
|
}
|
|
|
|
// Define one vertex (position)
|
|
void rlVertex3f(float x, float y, float z)
|
|
{
|
|
if (useTempBuffer)
|
|
{
|
|
tempBuffer[tempBufferCount].x = x;
|
|
tempBuffer[tempBufferCount].y = y;
|
|
tempBuffer[tempBufferCount].z = z;
|
|
tempBufferCount++;
|
|
}
|
|
else
|
|
{
|
|
switch (currentDrawMode)
|
|
{
|
|
case RL_LINES:
|
|
{
|
|
// Verify that MAX_LINES_BATCH limit not reached
|
|
if (lines.vCounter / 2 < MAX_LINES_BATCH)
|
|
{
|
|
lines.vertices[3*lines.vCounter] = x;
|
|
lines.vertices[3*lines.vCounter + 1] = y;
|
|
lines.vertices[3*lines.vCounter + 2] = z;
|
|
|
|
lines.vCounter++;
|
|
}
|
|
else TraceLog(ERROR, "MAX_LINES_BATCH overflow");
|
|
|
|
} break;
|
|
case RL_TRIANGLES:
|
|
{
|
|
// Verify that MAX_TRIANGLES_BATCH limit not reached
|
|
if (triangles.vCounter / 3 < MAX_TRIANGLES_BATCH)
|
|
{
|
|
triangles.vertices[3*triangles.vCounter] = x;
|
|
triangles.vertices[3*triangles.vCounter + 1] = y;
|
|
triangles.vertices[3*triangles.vCounter + 2] = z;
|
|
|
|
triangles.vCounter++;
|
|
}
|
|
else TraceLog(ERROR, "MAX_TRIANGLES_BATCH overflow");
|
|
|
|
} break;
|
|
case RL_QUADS:
|
|
{
|
|
// Verify that MAX_QUADS_BATCH limit not reached
|
|
if (quads.vCounter / 4 < MAX_QUADS_BATCH)
|
|
{
|
|
quads.vertices[3*quads.vCounter] = x;
|
|
quads.vertices[3*quads.vCounter + 1] = y;
|
|
quads.vertices[3*quads.vCounter + 2] = z;
|
|
|
|
quads.vCounter++;
|
|
|
|
draws[drawsCounter - 1].vertexCount++;
|
|
}
|
|
else TraceLog(ERROR, "MAX_QUADS_BATCH overflow");
|
|
|
|
} break;
|
|
default: break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Define one vertex (position)
|
|
void rlVertex2f(float x, float y)
|
|
{
|
|
rlVertex3f(x, y, 0.0f);
|
|
}
|
|
|
|
// Define one vertex (position)
|
|
void rlVertex2i(int x, int y)
|
|
{
|
|
rlVertex3f((float)x, (float)y, 0.0f);
|
|
}
|
|
|
|
// Define one vertex (texture coordinate)
|
|
// NOTE: Texture coordinates are limited to QUADS only
|
|
void rlTexCoord2f(float x, float y)
|
|
{
|
|
if (currentDrawMode == RL_QUADS)
|
|
{
|
|
quads.texcoords[2*quads.tcCounter] = x;
|
|
quads.texcoords[2*quads.tcCounter + 1] = y;
|
|
|
|
quads.tcCounter++;
|
|
}
|
|
}
|
|
|
|
// Define one vertex (normal)
|
|
// NOTE: Normals limited to TRIANGLES only ?
|
|
void rlNormal3f(float x, float y, float z)
|
|
{
|
|
// TODO: Normals usage...
|
|
}
|
|
|
|
// Define one vertex (color)
|
|
void rlColor4ub(byte x, byte y, byte z, byte w)
|
|
{
|
|
switch (currentDrawMode)
|
|
{
|
|
case RL_LINES:
|
|
{
|
|
lines.colors[4*lines.cCounter] = x;
|
|
lines.colors[4*lines.cCounter + 1] = y;
|
|
lines.colors[4*lines.cCounter + 2] = z;
|
|
lines.colors[4*lines.cCounter + 3] = w;
|
|
|
|
lines.cCounter++;
|
|
|
|
} break;
|
|
case RL_TRIANGLES:
|
|
{
|
|
triangles.colors[4*triangles.cCounter] = x;
|
|
triangles.colors[4*triangles.cCounter + 1] = y;
|
|
triangles.colors[4*triangles.cCounter + 2] = z;
|
|
triangles.colors[4*triangles.cCounter + 3] = w;
|
|
|
|
triangles.cCounter++;
|
|
|
|
} break;
|
|
case RL_QUADS:
|
|
{
|
|
quads.colors[4*quads.cCounter] = x;
|
|
quads.colors[4*quads.cCounter + 1] = y;
|
|
quads.colors[4*quads.cCounter + 2] = z;
|
|
quads.colors[4*quads.cCounter + 3] = w;
|
|
|
|
quads.cCounter++;
|
|
|
|
} break;
|
|
default: break;
|
|
}
|
|
}
|
|
|
|
// Define one vertex (color)
|
|
void rlColor4f(float r, float g, float b, float a)
|
|
{
|
|
rlColor4ub((byte)(r*255), (byte)(g*255), (byte)(b*255), (byte)(a*255));
|
|
}
|
|
|
|
// Define one vertex (color)
|
|
void rlColor3f(float x, float y, float z)
|
|
{
|
|
rlColor4ub((byte)(x*255), (byte)(y*255), (byte)(z*255), 255);
|
|
}
|
|
|
|
#endif
|
|
|
|
//----------------------------------------------------------------------------------
|
|
// Module Functions Definition - OpenGL equivalent functions (common to 1.1, 3.3+, ES2)
|
|
//----------------------------------------------------------------------------------
|
|
|
|
// Enable texture usage
|
|
void rlEnableTexture(unsigned int id)
|
|
{
|
|
#if defined(GRAPHICS_API_OPENGL_11)
|
|
glEnable(GL_TEXTURE_2D);
|
|
glBindTexture(GL_TEXTURE_2D, id);
|
|
#endif
|
|
|
|
#if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
|
|
if (draws[drawsCounter - 1].textureId != id)
|
|
{
|
|
if (draws[drawsCounter - 1].vertexCount > 0) drawsCounter++;
|
|
|
|
draws[drawsCounter - 1].textureId = id;
|
|
draws[drawsCounter - 1].vertexCount = 0;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
// Disable texture usage
|
|
void rlDisableTexture(void)
|
|
{
|
|
#if defined(GRAPHICS_API_OPENGL_11)
|
|
glDisable(GL_TEXTURE_2D);
|
|
glBindTexture(GL_TEXTURE_2D, 0);
|
|
#endif
|
|
}
|
|
|
|
// Unload texture from GPU memory
|
|
void rlDeleteTextures(unsigned int id)
|
|
{
|
|
glDeleteTextures(1, &id);
|
|
}
|
|
|
|
// Unload vertex data (VAO) from GPU memory
|
|
void rlDeleteVertexArrays(unsigned int id)
|
|
{
|
|
#if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
|
|
if (vaoSupported) glDeleteVertexArrays(1, &id);
|
|
#endif
|
|
}
|
|
|
|
// Unload vertex data (VBO) from GPU memory
|
|
void rlDeleteBuffers(unsigned int id)
|
|
{
|
|
#if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
|
|
glDeleteBuffers(1, &id);
|
|
#endif
|
|
}
|
|
|
|
// Clear color buffer with color
|
|
void rlClearColor(byte r, byte g, byte b, byte a)
|
|
{
|
|
// Color values clamp to 0.0f(0) and 1.0f(255)
|
|
float cr = (float)r / 255;
|
|
float cg = (float)g / 255;
|
|
float cb = (float)b / 255;
|
|
float ca = (float)a / 255;
|
|
|
|
glClearColor(cr, cg, cb, ca);
|
|
}
|
|
|
|
// Clear used screen buffers (color and depth)
|
|
void rlClearScreenBuffers(void)
|
|
{
|
|
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear used buffers: Color and Depth (Depth is used for 3D)
|
|
//glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT); // Stencil buffer not used...
|
|
}
|
|
|
|
// Returns current OpenGL version
|
|
int rlGetVersion(void)
|
|
{
|
|
#if defined(GRAPHICS_API_OPENGL_11)
|
|
return OPENGL_11;
|
|
#elif defined(GRAPHICS_API_OPENGL_33)
|
|
return OPENGL_33;
|
|
#elif defined(GRAPHICS_API_OPENGL_ES2)
|
|
return OPENGL_ES_20;
|
|
#endif
|
|
}
|
|
|
|
//----------------------------------------------------------------------------------
|
|
// Module Functions Definition - rlgl Functions
|
|
//----------------------------------------------------------------------------------
|
|
|
|
// Init OpenGL 3.3+ required data
|
|
void rlglInit(void)
|
|
{
|
|
#if defined(GRAPHICS_API_OPENGL_33)
|
|
// Loading extensions the hard way (Example)
|
|
/*
|
|
GLint numExt;
|
|
glGetIntegerv(GL_NUM_EXTENSIONS, &numExt);
|
|
|
|
for (int i = 0; i < numExt; i++)
|
|
{
|
|
const GLubyte *extensionName = glGetStringi(GL_EXTENSIONS, i);
|
|
if (strcmp(extensionName, (const GLubyte *)"GL_ARB_vertex_array_object") == 0)
|
|
{
|
|
// The extension is supported by our hardware and driver, try to get related functions popinters
|
|
glGenVertexArrays = (PFNGLGENVERTEXARRAYSOESPROC)wglGetProcAddress("glGenVertexArrays");
|
|
glBindVertexArray = (PFNGLBINDVERTEXARRAYOESPROC)wglGetProcAddress("glBindVertexArray");
|
|
glDeleteVertexArrays = (PFNGLDELETEVERTEXARRAYSOESPROC)wglGetProcAddress("glDeleteVertexArrays");
|
|
glIsVertexArray = (PFNGLISVERTEXARRAYOESPROC)wglGetProcAddress("glIsVertexArray");
|
|
}
|
|
}
|
|
*/
|
|
|
|
// Initialize extensions using GLEW
|
|
glewExperimental = 1; // Needed for core profile
|
|
|
|
GLenum error = glewInit();
|
|
|
|
if (error != GLEW_OK) TraceLog(ERROR, "Failed to initialize GLEW - Error Code: %s\n", glewGetErrorString(error));
|
|
|
|
if (glewIsSupported("GL_VERSION_3_3")) TraceLog(INFO, "OpenGL 3.3 extensions supported");
|
|
|
|
// NOTE: GLEW is a big library that loads ALL extensions, using glad we can only load required ones...
|
|
//if (!gladLoadGL()) TraceLog("ERROR: Failed to initialize glad\n");
|
|
|
|
vaoSupported = true;
|
|
#endif
|
|
|
|
#if defined(GRAPHICS_API_OPENGL_ES2)
|
|
// NOTE: emscripten does not support VAOs natively, it uses emulation and it reduces overall performance...
|
|
#if !defined(PLATFORM_WEB)
|
|
glGenVertexArrays = (PFNGLGENVERTEXARRAYSOESPROC)eglGetProcAddress("glGenVertexArraysOES");
|
|
glBindVertexArray = (PFNGLBINDVERTEXARRAYOESPROC)eglGetProcAddress("glBindVertexArrayOES");
|
|
glDeleteVertexArrays = (PFNGLDELETEVERTEXARRAYSOESPROC)eglGetProcAddress("glDeleteVertexArraysOES");
|
|
glIsVertexArray = (PFNGLISVERTEXARRAYOESPROC)eglGetProcAddress("glIsVertexArrayOES");
|
|
#endif
|
|
|
|
if (glGenVertexArrays == NULL) TraceLog(WARNING, "Could not initialize VAO extensions, VAOs not supported");
|
|
else
|
|
{
|
|
vaoSupported = true;
|
|
TraceLog(INFO, "VAO extensions initialized successfully");
|
|
}
|
|
#endif
|
|
|
|
// Print current OpenGL and GLSL version
|
|
TraceLog(INFO, "GPU: Vendor: %s", glGetString(GL_VENDOR));
|
|
TraceLog(INFO, "GPU: Renderer: %s", glGetString(GL_RENDERER));
|
|
TraceLog(INFO, "GPU: Version: %s", glGetString(GL_VERSION));
|
|
TraceLog(INFO, "GPU: GLSL: %s", glGetString(0x8B8C)); //GL_SHADING_LANGUAGE_VERSION
|
|
|
|
// NOTE: We can get a bunch of extra information about GPU capabilities (glGet*)
|
|
//int maxTexSize;
|
|
//glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxTexSize);
|
|
//TraceLog(INFO, "GL_MAX_TEXTURE_SIZE: %i", maxTexSize);
|
|
|
|
//int numAuxBuffers;
|
|
//glGetIntegerv(GL_AUX_BUFFERS, &numAuxBuffers);
|
|
//TraceLog(INFO, "GL_AUX_BUFFERS: %i", numAuxBuffers);
|
|
|
|
// Show supported extensions
|
|
// NOTE: We don't need that much data on screen... right now...
|
|
/*
|
|
#if defined(GRAPHICS_API_OPENGL_33)
|
|
GLint numExt;
|
|
glGetIntegerv(GL_NUM_EXTENSIONS, &numExt);
|
|
|
|
for (int i = 0; i < numExt; i++)
|
|
{
|
|
TraceLog(INFO, "Supported extension: %s", glGetStringi(GL_EXTENSIONS, i));
|
|
}
|
|
#elif defined(GRAPHICS_API_OPENGL_ES2)
|
|
char *extensions = (char *)glGetString(GL_EXTENSIONS); // One big string
|
|
|
|
// NOTE: String could be splitted using strtok() function (string.h)
|
|
TraceLog(INFO, "Supported extension: %s", extensions);
|
|
#endif
|
|
*/
|
|
|
|
#if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
|
|
// Set default draw mode
|
|
currentDrawMode = RL_TRIANGLES;
|
|
|
|
// Reset projection and modelview matrices
|
|
projection = MatrixIdentity();
|
|
modelview = MatrixIdentity();
|
|
currentMatrix = &modelview;
|
|
|
|
// Initialize matrix stack
|
|
for (int i = 0; i < MATRIX_STACK_SIZE; i++) stack[i] = MatrixIdentity();
|
|
|
|
// Init default Shader (GLSL 110) -> Common for GL 3.3+ and ES2
|
|
defaultShaderProgram = LoadDefaultShader();
|
|
simpleShaderProgram = LoadSimpleShader();
|
|
//customShaderProgram = LoadShaders("simple150.vert", "simple150.frag");
|
|
|
|
// Get handles to GLSL input vars locations for defaultShaderProgram
|
|
//-------------------------------------------------------------------
|
|
defaultVertexLoc = glGetAttribLocation(defaultShaderProgram, "vertexPosition");
|
|
defaultTexcoordLoc = glGetAttribLocation(defaultShaderProgram, "vertexTexCoord");
|
|
defaultColorLoc = glGetAttribLocation(defaultShaderProgram, "vertexColor");
|
|
|
|
// Get handles to GLSL uniform vars locations (vertex-shader)
|
|
defaultModelviewMatrixLoc = glGetUniformLocation(defaultShaderProgram, "modelviewMatrix");
|
|
defaultProjectionMatrixLoc = glGetUniformLocation(defaultShaderProgram, "projectionMatrix");
|
|
|
|
// Get handles to GLSL uniform vars locations (fragment-shader)
|
|
defaultTextureLoc = glGetUniformLocation(defaultShaderProgram, "texture0");
|
|
//--------------------------------------------------------------------
|
|
|
|
// Get handles to GLSL input vars locations for simpleShaderProgram
|
|
//-------------------------------------------------------------------
|
|
simpleVertexLoc = glGetAttribLocation(simpleShaderProgram, "vertexPosition");
|
|
simpleTexcoordLoc = glGetAttribLocation(simpleShaderProgram, "vertexTexCoord");
|
|
simpleNormalLoc = glGetAttribLocation(defaultShaderProgram, "vertexNormal");
|
|
|
|
// Get handles to GLSL uniform vars locations (vertex-shader)
|
|
simpleModelviewMatrixLoc = glGetUniformLocation(simpleShaderProgram, "modelviewMatrix");
|
|
simpleProjectionMatrixLoc = glGetUniformLocation(simpleShaderProgram, "projectionMatrix");
|
|
|
|
// Get handles to GLSL uniform vars locations (fragment-shader)
|
|
simpleTextureLoc = glGetUniformLocation(simpleShaderProgram, "texture0");
|
|
simpleColorLoc = glGetUniformLocation(simpleShaderProgram, "fragColor");
|
|
//--------------------------------------------------------------------
|
|
|
|
InitializeBuffers(); // Init vertex arrays
|
|
InitializeBuffersGPU(); // Init VBO and VAO
|
|
|
|
// Init temp vertex buffer, used when transformation required (translate, rotate, scale)
|
|
tempBuffer = (Vector3 *)malloc(sizeof(Vector3)*TEMP_VERTEX_BUFFER_SIZE);
|
|
|
|
for (int i = 0; i < TEMP_VERTEX_BUFFER_SIZE; i++) tempBuffer[i] = VectorZero();
|
|
|
|
// Create default white texture for plain colors (required by shader)
|
|
unsigned char pixels[4] = { 255, 255, 255, 255 }; // 1 pixel RGBA (4 bytes)
|
|
|
|
whiteTexture = rlglLoadTexture(pixels, 1, 1, false);
|
|
|
|
if (whiteTexture != 0) TraceLog(INFO, "[TEX ID %i] Base white texture loaded successfully", whiteTexture);
|
|
else TraceLog(WARNING, "Base white texture could not be loaded");
|
|
|
|
// Init draw calls tracking system
|
|
draws = (DrawCall *)malloc(sizeof(DrawCall)*MAX_DRAWS_BY_TEXTURE);
|
|
|
|
for (int i = 0; i < MAX_DRAWS_BY_TEXTURE; i++)
|
|
{
|
|
draws[i].textureId = 0;
|
|
draws[i].vertexCount = 0;
|
|
}
|
|
|
|
drawsCounter = 1;
|
|
draws[drawsCounter - 1].textureId = whiteTexture;
|
|
#endif
|
|
}
|
|
|
|
// Vertex Buffer Object deinitialization (memory free)
|
|
void rlglClose(void)
|
|
{
|
|
#if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
|
|
// Unbind everything
|
|
if (vaoSupported) glBindVertexArray(0);
|
|
glDisableVertexAttribArray(0);
|
|
glDisableVertexAttribArray(1);
|
|
glDisableVertexAttribArray(2);
|
|
glDisableVertexAttribArray(3);
|
|
glBindBuffer(GL_ARRAY_BUFFER, 0);
|
|
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
|
|
|
|
glUseProgram(0);
|
|
|
|
// Delete VBOs
|
|
glDeleteBuffers(1, &linesBuffer[0]);
|
|
glDeleteBuffers(1, &linesBuffer[1]);
|
|
glDeleteBuffers(1, &trianglesBuffer[0]);
|
|
glDeleteBuffers(1, &trianglesBuffer[1]);
|
|
glDeleteBuffers(1, &quadsBuffer[0]);
|
|
glDeleteBuffers(1, &quadsBuffer[1]);
|
|
glDeleteBuffers(1, &quadsBuffer[2]);
|
|
glDeleteBuffers(1, &quadsBuffer[3]);
|
|
|
|
if (vaoSupported)
|
|
{
|
|
// Delete VAOs
|
|
glDeleteVertexArrays(1, &vaoLines);
|
|
glDeleteVertexArrays(1, &vaoTriangles);
|
|
glDeleteVertexArrays(1, &vaoQuads);
|
|
}
|
|
|
|
//glDetachShader(defaultShaderProgram, v);
|
|
//glDetachShader(defaultShaderProgram, f);
|
|
//glDeleteShader(v);
|
|
//glDeleteShader(f);
|
|
glDeleteProgram(defaultShaderProgram);
|
|
|
|
// Free vertex arrays memory
|
|
free(lines.vertices);
|
|
free(lines.colors);
|
|
|
|
free(triangles.vertices);
|
|
free(triangles.colors);
|
|
|
|
free(quads.vertices);
|
|
free(quads.texcoords);
|
|
free(quads.colors);
|
|
free(quads.indices);
|
|
|
|
// Free GPU texture
|
|
glDeleteTextures(1, &whiteTexture);
|
|
|
|
free(draws);
|
|
#endif
|
|
}
|
|
|
|
void rlglDraw(void)
|
|
{
|
|
#if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
|
|
UpdateBuffers();
|
|
|
|
if ((lines.vCounter > 0) || (triangles.vCounter > 0) || (quads.vCounter > 0))
|
|
{
|
|
glUseProgram(defaultShaderProgram); // Use our shader
|
|
|
|
glUniformMatrix4fv(defaultProjectionMatrixLoc, 1, false, GetMatrixVector(projection));
|
|
glUniformMatrix4fv(defaultModelviewMatrixLoc, 1, false, GetMatrixVector(modelview));
|
|
glUniform1i(defaultTextureLoc, 0);
|
|
}
|
|
|
|
// NOTE: We draw in this order: triangle shapes, textured quads and lines
|
|
|
|
if (triangles.vCounter > 0)
|
|
{
|
|
glBindTexture(GL_TEXTURE_2D, whiteTexture);
|
|
|
|
if (vaoSupported)
|
|
{
|
|
glBindVertexArray(vaoTriangles);
|
|
}
|
|
else
|
|
{
|
|
glBindBuffer(GL_ARRAY_BUFFER, trianglesBuffer[0]);
|
|
glVertexAttribPointer(defaultVertexLoc, 3, GL_FLOAT, 0, 0, 0);
|
|
glEnableVertexAttribArray(defaultVertexLoc);
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, trianglesBuffer[1]);
|
|
glVertexAttribPointer(defaultColorLoc, 4, GL_UNSIGNED_BYTE, GL_TRUE, 0, 0);
|
|
glEnableVertexAttribArray(defaultColorLoc);
|
|
}
|
|
|
|
glDrawArrays(GL_TRIANGLES, 0, triangles.vCounter);
|
|
|
|
if (!vaoSupported) glBindBuffer(GL_ARRAY_BUFFER, 0);
|
|
glBindTexture(GL_TEXTURE_2D, 0);
|
|
}
|
|
|
|
if (quads.vCounter > 0)
|
|
{
|
|
int quadsCount = 0;
|
|
int numIndicesToProcess = 0;
|
|
int indicesOffset = 0;
|
|
|
|
if (vaoSupported)
|
|
{
|
|
glBindVertexArray(vaoQuads);
|
|
}
|
|
else
|
|
{
|
|
// Enable vertex attributes
|
|
glBindBuffer(GL_ARRAY_BUFFER, quadsBuffer[0]);
|
|
glVertexAttribPointer(defaultVertexLoc, 3, GL_FLOAT, 0, 0, 0);
|
|
glEnableVertexAttribArray(defaultVertexLoc);
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, quadsBuffer[1]);
|
|
glVertexAttribPointer(defaultTexcoordLoc, 2, GL_FLOAT, 0, 0, 0);
|
|
glEnableVertexAttribArray(defaultTexcoordLoc);
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, quadsBuffer[2]);
|
|
glVertexAttribPointer(defaultColorLoc, 4, GL_UNSIGNED_BYTE, GL_TRUE, 0, 0);
|
|
glEnableVertexAttribArray(defaultColorLoc);
|
|
|
|
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, quadsBuffer[3]);
|
|
}
|
|
|
|
//TraceLog(DEBUG, "Draws required per frame: %i", drawsCounter);
|
|
|
|
for (int i = 0; i < drawsCounter; i++)
|
|
{
|
|
quadsCount = draws[i].vertexCount/4;
|
|
numIndicesToProcess = quadsCount*6; // Get number of Quads * 6 index by Quad
|
|
|
|
//TraceLog(DEBUG, "Quads to render: %i - Vertex Count: %i", quadsCount, draws[i].vertexCount);
|
|
|
|
glBindTexture(GL_TEXTURE_2D, draws[i].textureId);
|
|
|
|
// NOTE: The final parameter tells the GPU the offset in bytes from the start of the index buffer to the location of the first index to process
|
|
#if defined(GRAPHICS_API_OPENGL_33)
|
|
glDrawElements(GL_TRIANGLES, numIndicesToProcess, GL_UNSIGNED_INT, (GLvoid*) (sizeof(GLuint) * indicesOffset));
|
|
#elif defined(GRAPHICS_API_OPENGL_ES2)
|
|
glDrawElements(GL_TRIANGLES, numIndicesToProcess, GL_UNSIGNED_SHORT, (GLvoid*) (sizeof(GLushort) * indicesOffset));
|
|
#endif
|
|
//GLenum err;
|
|
//if ((err = glGetError()) != GL_NO_ERROR) TraceLog(INFO, "OpenGL error: %i", (int)err); //GL_INVALID_ENUM!
|
|
|
|
indicesOffset += draws[i].vertexCount/4*6;
|
|
}
|
|
|
|
if (!vaoSupported)
|
|
{
|
|
glBindBuffer(GL_ARRAY_BUFFER, 0);
|
|
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
|
|
}
|
|
|
|
glBindTexture(GL_TEXTURE_2D, 0); // Unbind textures
|
|
}
|
|
|
|
if (lines.vCounter > 0)
|
|
{
|
|
glBindTexture(GL_TEXTURE_2D, whiteTexture);
|
|
|
|
if (vaoSupported)
|
|
{
|
|
glBindVertexArray(vaoLines);
|
|
}
|
|
else
|
|
{
|
|
glBindBuffer(GL_ARRAY_BUFFER, linesBuffer[0]);
|
|
glVertexAttribPointer(defaultVertexLoc, 3, GL_FLOAT, 0, 0, 0);
|
|
glEnableVertexAttribArray(defaultVertexLoc);
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, linesBuffer[1]);
|
|
glVertexAttribPointer(defaultColorLoc, 4, GL_UNSIGNED_BYTE, GL_TRUE, 0, 0);
|
|
glEnableVertexAttribArray(defaultColorLoc);
|
|
}
|
|
|
|
glDrawArrays(GL_LINES, 0, lines.vCounter);
|
|
|
|
if (!vaoSupported) glBindBuffer(GL_ARRAY_BUFFER, 0);
|
|
glBindTexture(GL_TEXTURE_2D, 0);
|
|
}
|
|
|
|
if (vaoSupported) glBindVertexArray(0); // Unbind VAO
|
|
|
|
// Reset draws counter
|
|
drawsCounter = 1;
|
|
draws[0].textureId = whiteTexture;
|
|
draws[0].vertexCount = 0;
|
|
|
|
// Reset vertex counters for next frame
|
|
lines.vCounter = 0;
|
|
lines.cCounter = 0;
|
|
|
|
triangles.vCounter = 0;
|
|
triangles.cCounter = 0;
|
|
|
|
quads.vCounter = 0;
|
|
quads.tcCounter = 0;
|
|
quads.cCounter = 0;
|
|
#endif
|
|
}
|
|
|
|
// Draw a 3d model
|
|
void rlglDrawModel(Model model, Vector3 position, Vector3 rotation, Vector3 scale, Color color, bool wires)
|
|
{
|
|
#if defined (GRAPHICS_API_OPENGL_11) || defined(GRAPHICS_API_OPENGL_33)
|
|
// NOTE: glPolygonMode() not available on OpenGL ES
|
|
if (wires) glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
|
|
#endif
|
|
|
|
#if defined(GRAPHICS_API_OPENGL_11)
|
|
glEnable(GL_TEXTURE_2D);
|
|
glBindTexture(GL_TEXTURE_2D, model.textureId);
|
|
|
|
// NOTE: On OpenGL 1.1 we use Vertex Arrays to draw model
|
|
glEnableClientState(GL_VERTEX_ARRAY); // Enable vertex array
|
|
glEnableClientState(GL_TEXTURE_COORD_ARRAY); // Enable texture coords array
|
|
glEnableClientState(GL_NORMAL_ARRAY); // Enable normals array
|
|
|
|
glVertexPointer(3, GL_FLOAT, 0, model.mesh.vertices); // Pointer to vertex coords array
|
|
glTexCoordPointer(2, GL_FLOAT, 0, model.mesh.texcoords); // Pointer to texture coords array
|
|
glNormalPointer(GL_FLOAT, 0, model.mesh.normals); // Pointer to normals array
|
|
//glColorPointer(4, GL_UNSIGNED_BYTE, 0, model.mesh.colors); // Pointer to colors array (NOT USED)
|
|
|
|
rlPushMatrix();
|
|
rlTranslatef(position.x, position.y, position.z);
|
|
rlScalef(scale.x, scale.y, scale.z);
|
|
rlRotatef(rotation.y, 0, 1, 0);
|
|
|
|
// TODO: If rotate in multiple axis, get rotation matrix and use rlMultMatrix()
|
|
|
|
rlColor4ub(color.r, color.g, color.b, color.a);
|
|
|
|
glDrawArrays(GL_TRIANGLES, 0, model.mesh.vertexCount);
|
|
rlPopMatrix();
|
|
|
|
glDisableClientState(GL_VERTEX_ARRAY); // Disable vertex array
|
|
glDisableClientState(GL_TEXTURE_COORD_ARRAY); // Disable texture coords array
|
|
glDisableClientState(GL_NORMAL_ARRAY); // Disable normals array
|
|
|
|
glDisable(GL_TEXTURE_2D);
|
|
glBindTexture(GL_TEXTURE_2D, 0);
|
|
#endif
|
|
|
|
#if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
|
|
glUseProgram(simpleShaderProgram); // Use our simple shader
|
|
|
|
VectorScale(&rotation, DEG2RAD);
|
|
|
|
// Get transform matrix (rotation -> scale -> translation)
|
|
Matrix transform = MatrixTransform(position, rotation, scale);
|
|
Matrix modelviewworld = MatrixMultiply(transform, modelview);
|
|
|
|
// NOTE: Drawing in OpenGL 3.3+, transform is passed to shader
|
|
glUniformMatrix4fv(simpleProjectionMatrixLoc, 1, false, GetMatrixVector(projection));
|
|
glUniformMatrix4fv(simpleModelviewMatrixLoc, 1, false, GetMatrixVector(modelviewworld));
|
|
glUniform1i(simpleTextureLoc, 0);
|
|
|
|
// Apply color tinting to model
|
|
// NOTE: Just update one uniform on fragment shader
|
|
float vColor[4] = { (float)color.r/255, (float)color.g/255, (float)color.b/255, (float)color.a/255 };
|
|
glUniform4fv(simpleColorLoc, 1, vColor);
|
|
|
|
if (vaoSupported)
|
|
{
|
|
glBindVertexArray(model.vaoId);
|
|
}
|
|
else
|
|
{
|
|
// Bind model VBOs data
|
|
glBindBuffer(GL_ARRAY_BUFFER, model.vboId[0]);
|
|
glVertexAttribPointer(simpleVertexLoc, 3, GL_FLOAT, 0, 0, 0);
|
|
glEnableVertexAttribArray(simpleVertexLoc);
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, model.vboId[1]);
|
|
glVertexAttribPointer(simpleTexcoordLoc, 2, GL_FLOAT, 0, 0, 0);
|
|
glEnableVertexAttribArray(simpleTexcoordLoc);
|
|
|
|
// Add normals support
|
|
glBindBuffer(GL_ARRAY_BUFFER, model.vboId[2]);
|
|
glVertexAttribPointer(simpleNormalLoc, 3, GL_FLOAT, 0, 0, 0);
|
|
glEnableVertexAttribArray(simpleNormalLoc);
|
|
}
|
|
|
|
glBindTexture(GL_TEXTURE_2D, model.textureId);
|
|
|
|
glDrawArrays(GL_TRIANGLES, 0, model.mesh.vertexCount);
|
|
|
|
glBindTexture(GL_TEXTURE_2D, 0); // Unbind textures
|
|
|
|
if (vaoSupported) glBindVertexArray(0); // Unbind VAO
|
|
else glBindBuffer(GL_ARRAY_BUFFER, 0); // Unbind VBOs
|
|
|
|
glUseProgram(0);
|
|
#endif
|
|
|
|
#if defined (GRAPHICS_API_OPENGL_11) || defined(GRAPHICS_API_OPENGL_33)
|
|
// NOTE: glPolygonMode() not available on OpenGL ES
|
|
if (wires) glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
|
|
#endif
|
|
}
|
|
|
|
// Initialize Graphics Device (OpenGL stuff)
|
|
void rlglInitGraphics(int offsetX, int offsetY, int width, int height)
|
|
{
|
|
// NOTE: Required! viewport must be recalculated if screen resized!
|
|
glViewport(offsetX/2, offsetY/2, width - offsetX, height - offsetY); // Set viewport width and height
|
|
|
|
// NOTE: Don't confuse glViewport with the transformation matrix
|
|
// NOTE: glViewport just defines the area of the context that you will actually draw to.
|
|
|
|
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear used buffers, depth buffer is used for 3D
|
|
glClearColor(0.0f, 0.0f, 0.0f, 1.0f); // Set background color (black)
|
|
//glClearDepth(1.0f); // Clear depth buffer (default)
|
|
|
|
glEnable(GL_DEPTH_TEST); // Enables depth testing (required for 3D)
|
|
glDepthFunc(GL_LEQUAL); // Type of depth testing to apply
|
|
|
|
glEnable(GL_BLEND); // Enable color blending (required to work with transparencies)
|
|
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); // Color blending function (how colors are mixed)
|
|
|
|
#if defined(GRAPHICS_API_OPENGL_11)
|
|
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); // Improve quality of color and texture coordinate interpolation (Deprecated in OGL 3.0)
|
|
// Other options: GL_FASTEST, GL_DONT_CARE (default)
|
|
#endif
|
|
|
|
rlMatrixMode(RL_PROJECTION); // Switch to PROJECTION matrix
|
|
rlLoadIdentity(); // Reset current matrix (PROJECTION)
|
|
|
|
rlOrtho(0, width - offsetX, height - offsetY, 0, 0, 1); // Config orthographic mode: top-left corner --> (0,0)
|
|
|
|
rlMatrixMode(RL_MODELVIEW); // Switch back to MODELVIEW matrix
|
|
rlLoadIdentity(); // Reset current matrix (MODELVIEW)
|
|
|
|
// NOTE: All shapes/models triangles are drawn CCW
|
|
|
|
glEnable(GL_CULL_FACE); // Enable backface culling (Disabled by default)
|
|
//glCullFace(GL_BACK); // Cull the Back face (default)
|
|
//glFrontFace(GL_CCW); // Front face are defined counter clockwise (default)
|
|
|
|
#if defined(GRAPHICS_API_OPENGL_11)
|
|
glShadeModel(GL_SMOOTH); // Smooth shading between vertex (vertex colors interpolation) (Deprecated on OpenGL 3.3+)
|
|
// Possible options: GL_SMOOTH (Color interpolation) or GL_FLAT (no interpolation)
|
|
#endif
|
|
|
|
TraceLog(INFO, "OpenGL Graphics initialized successfully");
|
|
}
|
|
|
|
// Convert image data to OpenGL texture (returns OpenGL valid Id)
|
|
unsigned int rlglLoadTexture(unsigned char *data, int width, int height, bool genMipmaps)
|
|
{
|
|
glBindTexture(GL_TEXTURE_2D,0); // Free any old binding
|
|
|
|
GLuint id;
|
|
glGenTextures(1, &id); // Generate Pointer to the texture
|
|
|
|
//glActiveTexture(GL_TEXTURE0);
|
|
glBindTexture(GL_TEXTURE_2D, id);
|
|
|
|
// NOTE: glTexParameteri does NOT affect texture uploading, just the way it's used!
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); // Set texture to repead on x-axis
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); // Set texture to repead on y-axis
|
|
|
|
bool texIsPOT = false;
|
|
|
|
// Check if width and height are power-of-two (POT)
|
|
if (((width > 0) && ((width & (width - 1)) == 0)) && ((height > 0) && ((height & (height - 1)) == 0))) texIsPOT = true;
|
|
|
|
if (genMipmaps && !texIsPOT)
|
|
{
|
|
TraceLog(WARNING, "[TEX ID %i] Texture is not power-of-two, mipmaps can not be generated", id);
|
|
|
|
genMipmaps = false;
|
|
}
|
|
|
|
// If mipmaps are being used, we configure mag-min filters accordingly
|
|
if (genMipmaps)
|
|
{
|
|
// Trilinear filtering with mipmaps
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); // Activate use of mipmaps (must be available)
|
|
}
|
|
else
|
|
{
|
|
// Not using mipmappings
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); // Filter for pixel-perfect drawing, alternative: GL_LINEAR
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); // Filter for pixel-perfect drawing, alternative: GL_LINEAR
|
|
}
|
|
|
|
#if defined(GRAPHICS_API_OPENGL_11)
|
|
if (genMipmaps)
|
|
{
|
|
TraceLog(WARNING, "[TEX ID %i] Mipmaps generated manually on CPU side", id);
|
|
|
|
// Compute required mipmaps
|
|
// NOTE: data size is reallocated to fit mipmaps data
|
|
int mipmapCount = GenerateMipmaps(data, width, height);
|
|
|
|
int offset = 0;
|
|
int size = 0;
|
|
|
|
int mipWidth = width;
|
|
int mipHeight = height;
|
|
|
|
// Load the mipmaps
|
|
for (int level = 0; level < mipmapCount; level++)
|
|
{
|
|
glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA8, mipWidth, mipHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, data + offset);
|
|
|
|
size = mipWidth*mipHeight*4;
|
|
offset += size;
|
|
|
|
mipWidth /= 2;
|
|
mipHeight /= 2;
|
|
}
|
|
}
|
|
else glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
|
|
#endif
|
|
|
|
#if defined(GRAPHICS_API_OPENGL_33)
|
|
// NOTE: We define internal (GPU) format as GL_RGBA8 (probably BGRA8 in practice, driver takes care)
|
|
//glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data); // OpenGL
|
|
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data); // WebGL
|
|
#elif defined(GRAPHICS_API_OPENGL_ES2)
|
|
// NOTE: On embedded systems, we let the driver choose the best internal format
|
|
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
|
|
#endif
|
|
|
|
#if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
|
|
if (genMipmaps)
|
|
{
|
|
glGenerateMipmap(GL_TEXTURE_2D); // Generate mipmaps automatically
|
|
TraceLog(INFO, "[TEX ID %i] Mipmaps generated automatically for new texture", id);
|
|
}
|
|
#endif
|
|
|
|
// At this point we have the image converted to texture and uploaded to GPU
|
|
|
|
// Unbind current texture
|
|
glBindTexture(GL_TEXTURE_2D, 0);
|
|
|
|
TraceLog(INFO, "[TEX ID %i] Texture created successfully (%ix%i)", id, width, height);
|
|
|
|
return id;
|
|
}
|
|
|
|
// Load vertex data into a VAO (if supported) and VBO
|
|
Model rlglLoadModel(VertexData mesh)
|
|
{
|
|
Model model;
|
|
|
|
model.mesh = mesh;
|
|
|
|
#if defined(GRAPHICS_API_OPENGL_11)
|
|
model.textureId = 0; // No texture required
|
|
model.vaoId = 0; // Vertex Array Object
|
|
model.vboId[0] = 0; // Vertex position VBO
|
|
model.vboId[1] = 0; // Texcoords VBO
|
|
model.vboId[2] = 0; // Normals VBO
|
|
|
|
#elif defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
|
|
model.textureId = 1; // Default whiteTexture
|
|
|
|
GLuint vaoModel = 0; // Vertex Array Objects (VAO)
|
|
GLuint vertexBuffer[3]; // Vertex Buffer Objects (VBO)
|
|
|
|
if (vaoSupported)
|
|
{
|
|
// Initialize Quads VAO (Buffer A)
|
|
glGenVertexArrays(1, &vaoModel);
|
|
glBindVertexArray(vaoModel);
|
|
}
|
|
|
|
// Create buffers for our vertex data (positions, texcoords, normals)
|
|
glGenBuffers(3, vertexBuffer);
|
|
|
|
// Enable vertex attributes: position
|
|
glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer[0]);
|
|
glBufferData(GL_ARRAY_BUFFER, sizeof(float)*3*mesh.vertexCount, mesh.vertices, GL_STATIC_DRAW);
|
|
glEnableVertexAttribArray(simpleVertexLoc);
|
|
glVertexAttribPointer(simpleVertexLoc, 3, GL_FLOAT, 0, 0, 0);
|
|
|
|
// Enable vertex attributes: texcoords
|
|
glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer[1]);
|
|
glBufferData(GL_ARRAY_BUFFER, sizeof(float)*2*mesh.vertexCount, mesh.texcoords, GL_STATIC_DRAW);
|
|
glEnableVertexAttribArray(simpleTexcoordLoc);
|
|
glVertexAttribPointer(simpleTexcoordLoc, 2, GL_FLOAT, 0, 0, 0);
|
|
|
|
// Enable vertex attributes: normals
|
|
glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer[2]);
|
|
glBufferData(GL_ARRAY_BUFFER, sizeof(float)*3*mesh.vertexCount, mesh.normals, GL_STATIC_DRAW);
|
|
glEnableVertexAttribArray(simpleNormalLoc);
|
|
glVertexAttribPointer(simpleNormalLoc, 3, GL_FLOAT, 0, 0, 0);
|
|
|
|
model.vboId[0] = vertexBuffer[0]; // Vertex position VBO
|
|
model.vboId[1] = vertexBuffer[1]; // Texcoords VBO
|
|
model.vboId[2] = vertexBuffer[2]; // Normals VBO
|
|
|
|
if (vaoSupported)
|
|
{
|
|
if (vaoModel > 0)
|
|
{
|
|
model.vaoId = vaoModel;
|
|
TraceLog(INFO, "[VAO ID %i] Model uploaded successfully to VRAM (GPU)", vaoModel);
|
|
}
|
|
else TraceLog(WARNING, "Model could not be uploaded to VRAM (GPU)");
|
|
}
|
|
else
|
|
{
|
|
TraceLog(INFO, "[VBO ID %i][VBO ID %i][VBO ID %i] Model uploaded successfully to VRAM (GPU)", model.vboId[0], model.vboId[1], model.vboId[2]);
|
|
}
|
|
#endif
|
|
|
|
return model;
|
|
}
|
|
|
|
// Convert image data to OpenGL texture (returns OpenGL valid Id)
|
|
// NOTE: Expected compressed image data and POT image
|
|
unsigned int rlglLoadCompressedTexture(unsigned char *data, int width, int height, int mipmapCount, int compFormat)
|
|
{
|
|
GLuint id;
|
|
|
|
#if defined(GRAPHICS_API_OPENGL_11)
|
|
id = 0;
|
|
TraceLog(WARNING, "GPU compressed textures not supported on OpenGL 1.1");
|
|
|
|
#elif defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
|
|
TraceLog(DEBUG, "Compressed texture width: %i", width);
|
|
TraceLog(DEBUG, "Compressed texture height: %i", height);
|
|
TraceLog(DEBUG, "Compressed texture mipmap levels: %i", mipmapCount);
|
|
TraceLog(DEBUG, "Compressed texture format: 0x%x", compFormat);
|
|
|
|
if (compFormat == 0)
|
|
{
|
|
id = 0;
|
|
TraceLog(WARNING, "Texture compressed format not recognized", id);
|
|
}
|
|
else
|
|
{
|
|
glGenTextures(1, &id);
|
|
|
|
// Bind the texture
|
|
glBindTexture(GL_TEXTURE_2D, id);
|
|
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
|
|
|
|
// Set texture parameters
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
|
|
|
|
// If mipmaps are being used, we configure mag-min filters accordingly
|
|
if (mipmapCount > 1)
|
|
{
|
|
// Trilinear filtering with mipmaps
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); // Activate use of mipmaps (must be available)
|
|
}
|
|
else
|
|
{
|
|
// Not using mipmappings
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); // Filter for pixel-perfect drawing, alternative: GL_LINEAR
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); // Filter for pixel-perfect drawing, alternative: GL_LINEAR
|
|
}
|
|
|
|
int blockSize = 0;
|
|
int offset = 0;
|
|
|
|
if (compFormat == GL_COMPRESSED_RGBA_S3TC_DXT1_EXT) blockSize = 8;
|
|
else blockSize = 16;
|
|
|
|
// Load the mipmaps
|
|
for (int level = 0; level < mipmapCount && (width || height); level++)
|
|
{
|
|
unsigned int size = 0;
|
|
|
|
// NOTE: size specifies the number of bytes of image data (S3TC/DXTC)
|
|
if (compFormat == GL_COMPRESSED_RGBA_S3TC_DXT1_EXT) size = ((width + 3)/4)*((height + 3)/4)*blockSize; // S3TC/DXTC
|
|
#if defined(GRAPHICS_API_OPENGL_ES2)
|
|
else if (compFormat == GL_ETC1_RGB8_OES) size = 8*((width + 3) >> 2)*((height + 3) >> 2); // ETC1
|
|
#endif
|
|
glCompressedTexImage2D(GL_TEXTURE_2D, level, compFormat, width, height, 0, size, data + offset);
|
|
|
|
offset += size;
|
|
width /= 2;
|
|
height /= 2;
|
|
|
|
// Security check for NPOT textures
|
|
if (width < 1) width = 1;
|
|
if (height < 1) height = 1;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
return id;
|
|
}
|
|
|
|
// Read screen pixel data (color buffer)
|
|
unsigned char *rlglReadScreenPixels(int width, int height)
|
|
{
|
|
unsigned char *screenData = (unsigned char *)malloc(width * height * sizeof(unsigned char) * 4);
|
|
|
|
// NOTE: glReadPixels returns image flipped vertically -> (0,0) is the bottom left corner of the framebuffer
|
|
glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, screenData);
|
|
|
|
// Flip image vertically!
|
|
unsigned char *imgData = (unsigned char *)malloc(width * height * sizeof(unsigned char) * 4);
|
|
|
|
for (int y = height-1; y >= 0; y--)
|
|
{
|
|
for (int x = 0; x < (width*4); x++)
|
|
{
|
|
imgData[x + (height - y - 1)*width*4] = screenData[x + (y*width*4)];
|
|
}
|
|
}
|
|
|
|
free(screenData);
|
|
|
|
return imgData; // NOTE: image data should be freed
|
|
}
|
|
|
|
#if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
|
|
|
|
void PrintProjectionMatrix()
|
|
{
|
|
PrintMatrix(projection);
|
|
}
|
|
|
|
void PrintModelviewMatrix()
|
|
{
|
|
PrintMatrix(modelview);
|
|
}
|
|
|
|
#endif
|
|
|
|
//----------------------------------------------------------------------------------
|
|
// Module specific Functions Definition
|
|
//----------------------------------------------------------------------------------
|
|
|
|
#if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
|
|
|
|
// Load Shader (Vertex and Fragment)
|
|
// NOTE: This shader program is used only for batch buffers (lines, triangles, quads)
|
|
static GLuint LoadDefaultShader(void)
|
|
{
|
|
// NOTE: Shaders are written using GLSL 110 (desktop), that is equivalent to GLSL 100 on ES2
|
|
|
|
// Vertex shader directly defined, no external file required
|
|
#if defined(GRAPHICS_API_OPENGL_33)
|
|
char vShaderStr[] = " #version 110 \n" // NOTE: Equivalent to version 100 on ES2
|
|
#elif defined(GRAPHICS_API_OPENGL_ES2)
|
|
char vShaderStr[] = " #version 100 \n" // NOTE: Must be defined this way! 110 doesn't work!
|
|
#endif
|
|
"uniform mat4 projectionMatrix; \n"
|
|
"uniform mat4 modelviewMatrix; \n"
|
|
"attribute vec3 vertexPosition; \n"
|
|
"attribute vec2 vertexTexCoord; \n"
|
|
"attribute vec4 vertexColor; \n"
|
|
"varying vec2 fragTexCoord; \n"
|
|
"varying vec4 fragColor; \n"
|
|
"void main() \n"
|
|
"{ \n"
|
|
" fragTexCoord = vertexTexCoord; \n"
|
|
" fragColor = vertexColor; \n"
|
|
" gl_Position = projectionMatrix * modelviewMatrix * vec4(vertexPosition, 1.0); \n"
|
|
"} \n";
|
|
|
|
// Fragment shader directly defined, no external file required
|
|
#if defined(GRAPHICS_API_OPENGL_33)
|
|
char fShaderStr[] = " #version 110 \n" // NOTE: Equivalent to version 100 on ES2
|
|
#elif defined(GRAPHICS_API_OPENGL_ES2)
|
|
char fShaderStr[] = " #version 100 \n" // NOTE: Must be defined this way! 110 doesn't work!
|
|
"precision mediump float; \n" // WebGL, required for emscripten
|
|
#endif
|
|
"uniform sampler2D texture0; \n"
|
|
"varying vec2 fragTexCoord; \n"
|
|
"varying vec4 fragColor; \n"
|
|
"void main() \n"
|
|
"{ \n"
|
|
" gl_FragColor = texture2D(texture0, fragTexCoord) * fragColor; \n"
|
|
"} \n";
|
|
|
|
GLuint program;
|
|
GLuint vertexShader;
|
|
GLuint fragmentShader;
|
|
|
|
vertexShader = glCreateShader(GL_VERTEX_SHADER);
|
|
fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
|
|
|
|
const char *pvs = vShaderStr;
|
|
const char *pfs = fShaderStr;
|
|
|
|
glShaderSource(vertexShader, 1, &pvs, NULL);
|
|
glShaderSource(fragmentShader, 1, &pfs, NULL);
|
|
|
|
GLint success = 0;
|
|
|
|
glCompileShader(vertexShader);
|
|
|
|
glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
|
|
|
|
if (success != GL_TRUE) TraceLog(WARNING, "[VSHDR ID %i] Failed to compile default vertex shader...", vertexShader);
|
|
else TraceLog(INFO, "[VSHDR ID %i] Default vertex shader compiled successfully", vertexShader);
|
|
|
|
glCompileShader(fragmentShader);
|
|
|
|
glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
|
|
|
|
if (success != GL_TRUE) TraceLog(WARNING, "[FSHDR ID %i] Failed to compile default fragment shader...", fragmentShader);
|
|
else TraceLog(INFO, "[FSHDR ID %i] Default fragment shader compiled successfully", fragmentShader);
|
|
|
|
program = glCreateProgram();
|
|
|
|
glAttachShader(program, vertexShader);
|
|
glAttachShader(program, fragmentShader);
|
|
|
|
glLinkProgram(program);
|
|
|
|
glGetProgramiv(program, GL_LINK_STATUS, &success);
|
|
|
|
if (success == GL_FALSE)
|
|
{
|
|
int maxLength;
|
|
int length;
|
|
|
|
glGetProgramiv(program, GL_INFO_LOG_LENGTH, &maxLength);
|
|
|
|
char log[maxLength];
|
|
|
|
glGetProgramInfoLog(program, maxLength, &length, log);
|
|
|
|
TraceLog(INFO, "Shader program fail log: %s", log);
|
|
}
|
|
else TraceLog(INFO, "[SHDR ID %i] Default shader program loaded successfully", program);
|
|
|
|
glDeleteShader(vertexShader);
|
|
glDeleteShader(fragmentShader);
|
|
|
|
return program;
|
|
}
|
|
|
|
// Load Simple Shader (Vertex and Fragment)
|
|
// NOTE: This shader program is used to render models
|
|
static GLuint LoadSimpleShader(void)
|
|
{
|
|
// NOTE: Shaders are written using GLSL 110 (desktop), that is equivalent to GLSL 100 on ES2
|
|
|
|
// Vertex shader directly defined, no external file required
|
|
#if defined(GRAPHICS_API_OPENGL_33)
|
|
char vShaderStr[] = " #version 110 \n" // NOTE: Equivalent to version 100 on ES2
|
|
#elif defined(GRAPHICS_API_OPENGL_ES2)
|
|
char vShaderStr[] = " #version 100 \n" // NOTE: Must be defined this way! 110 doesn't work!
|
|
#endif
|
|
"uniform mat4 projectionMatrix; \n"
|
|
"uniform mat4 modelviewMatrix; \n"
|
|
"attribute vec3 vertexPosition; \n"
|
|
"attribute vec2 vertexTexCoord; \n"
|
|
"attribute vec3 vertexNormal; \n"
|
|
"varying vec2 fragTexCoord; \n"
|
|
"void main() \n"
|
|
"{ \n"
|
|
" fragTexCoord = vertexTexCoord; \n"
|
|
" gl_Position = projectionMatrix * modelviewMatrix * vec4(vertexPosition, 1.0); \n"
|
|
"} \n";
|
|
|
|
// Fragment shader directly defined, no external file required
|
|
#if defined(GRAPHICS_API_OPENGL_33)
|
|
char fShaderStr[] = " #version 110 \n" // NOTE: Equivalent to version 100 on ES2
|
|
#elif defined(GRAPHICS_API_OPENGL_ES2)
|
|
char fShaderStr[] = " #version 100 \n" // NOTE: Must be defined this way! 110 doesn't work!
|
|
"precision mediump float; \n" // WebGL, required for emscripten
|
|
#endif
|
|
"uniform sampler2D texture0; \n"
|
|
"varying vec2 fragTexCoord; \n"
|
|
"uniform vec4 fragColor; \n"
|
|
"void main() \n"
|
|
"{ \n"
|
|
" gl_FragColor = texture2D(texture0, fragTexCoord) * fragColor; \n"
|
|
"} \n";
|
|
|
|
GLuint program;
|
|
GLuint vertexShader;
|
|
GLuint fragmentShader;
|
|
|
|
vertexShader = glCreateShader(GL_VERTEX_SHADER);
|
|
fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
|
|
|
|
const char *pvs = vShaderStr;
|
|
const char *pfs = fShaderStr;
|
|
|
|
glShaderSource(vertexShader, 1, &pvs, NULL);
|
|
glShaderSource(fragmentShader, 1, &pfs, NULL);
|
|
|
|
GLint success = 0;
|
|
|
|
glCompileShader(vertexShader);
|
|
|
|
glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
|
|
|
|
if (success != GL_TRUE) TraceLog(WARNING, "[VSHDR ID %i] Failed to compile simple vertex shader...", vertexShader);
|
|
else TraceLog(INFO, "[VSHDR ID %i] Simple vertex shader compiled successfully", vertexShader);
|
|
|
|
glCompileShader(fragmentShader);
|
|
|
|
glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
|
|
|
|
if (success != GL_TRUE) TraceLog(WARNING, "[FSHDR ID %i] Failed to compile simple fragment shader...", fragmentShader);
|
|
else TraceLog(INFO, "[FSHDR ID %i] Simple fragment shader compiled successfully", fragmentShader);
|
|
|
|
program = glCreateProgram();
|
|
|
|
glAttachShader(program, vertexShader);
|
|
glAttachShader(program, fragmentShader);
|
|
|
|
glLinkProgram(program);
|
|
|
|
glGetProgramiv(program, GL_LINK_STATUS, &success);
|
|
|
|
if (success == GL_FALSE)
|
|
{
|
|
int maxLength;
|
|
int length;
|
|
|
|
glGetProgramiv(program, GL_INFO_LOG_LENGTH, &maxLength);
|
|
|
|
char log[maxLength];
|
|
|
|
glGetProgramInfoLog(program, maxLength, &length, log);
|
|
|
|
TraceLog(INFO, "Shader program fail log: %s", log);
|
|
}
|
|
else TraceLog(INFO, "[SHDR ID %i] Simple shader program loaded successfully", program);
|
|
|
|
glDeleteShader(vertexShader);
|
|
glDeleteShader(fragmentShader);
|
|
|
|
return program;
|
|
}
|
|
|
|
// Load shaders from text files
|
|
static GLuint LoadCustomShader(char *vertexFileName, char *fragmentFileName)
|
|
{
|
|
// Shaders loading from external text file
|
|
char *vShaderStr = TextFileRead(vertexFileName);
|
|
char *fShaderStr = TextFileRead(fragmentFileName);
|
|
|
|
GLuint program;
|
|
GLuint vertexShader;
|
|
GLuint fragmentShader;
|
|
|
|
vertexShader = glCreateShader(GL_VERTEX_SHADER);
|
|
fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
|
|
|
|
const char *pvs = vShaderStr;
|
|
const char *pfs = fShaderStr;
|
|
|
|
glShaderSource(vertexShader, 1, &pvs, NULL);
|
|
glShaderSource(fragmentShader, 1, &pfs, NULL);
|
|
|
|
glCompileShader(vertexShader);
|
|
glCompileShader(fragmentShader);
|
|
|
|
TraceLog(INFO, "[VSHDR ID %i] Vertex shader compiled successfully", vertexShader);
|
|
TraceLog(INFO, "[FSHDR ID %i] Fragment shader compiled successfully", fragmentShader);
|
|
|
|
program = glCreateProgram();
|
|
|
|
glAttachShader(program, vertexShader);
|
|
glAttachShader(program, fragmentShader);
|
|
|
|
glLinkProgram(program);
|
|
|
|
glDeleteShader(vertexShader);
|
|
glDeleteShader(fragmentShader);
|
|
|
|
free(vShaderStr);
|
|
free(fShaderStr);
|
|
|
|
TraceLog(INFO, "[SHDR ID %i] Shader program loaded successfully", program);
|
|
|
|
return program;
|
|
}
|
|
|
|
// Read shader text file
|
|
// NOTE: text chars array should be freed manually
|
|
static char *TextFileRead(char *fileName)
|
|
{
|
|
FILE *textFile;
|
|
char *text = NULL;
|
|
|
|
int count=0;
|
|
|
|
if (fileName != NULL)
|
|
{
|
|
textFile = fopen(fileName,"rt");
|
|
|
|
if (textFile != NULL)
|
|
{
|
|
fseek(textFile, 0, SEEK_END);
|
|
count = ftell(textFile);
|
|
rewind(textFile);
|
|
|
|
if (count > 0)
|
|
{
|
|
text = (char *)malloc(sizeof(char) * (count+1));
|
|
count = fread(text, sizeof(char), count, textFile);
|
|
text[count] = '\0';
|
|
}
|
|
|
|
fclose(textFile);
|
|
}
|
|
else TraceLog(WARNING, "[%s] Text file could not be opened", fileName);
|
|
}
|
|
|
|
return text;
|
|
}
|
|
|
|
// Allocate and initialize float array buffers to store vertex data (lines, triangles, quads)
|
|
static void InitializeBuffers(void)
|
|
{
|
|
// Initialize lines arrays (vertex position and color data)
|
|
lines.vertices = (float *)malloc(sizeof(float)*3*2*MAX_LINES_BATCH); // 3 float by vertex, 2 vertex by line
|
|
lines.colors = (unsigned char *)malloc(sizeof(unsigned char)*4*2*MAX_LINES_BATCH); // 4 float by color, 2 colors by line
|
|
|
|
for (int i = 0; i < (3*2*MAX_LINES_BATCH); i++) lines.vertices[i] = 0.0f;
|
|
for (int i = 0; i < (4*2*MAX_LINES_BATCH); i++) lines.colors[i] = 0;
|
|
|
|
lines.vCounter = 0;
|
|
lines.cCounter = 0;
|
|
|
|
// Initialize triangles arrays (vertex position and color data)
|
|
triangles.vertices = (float *)malloc(sizeof(float)*3*3*MAX_TRIANGLES_BATCH); // 3 float by vertex, 3 vertex by triangle
|
|
triangles.colors = (unsigned char *)malloc(sizeof(unsigned char)*4*3*MAX_TRIANGLES_BATCH); // 4 float by color, 3 colors by triangle
|
|
|
|
for (int i = 0; i < (3*3*MAX_TRIANGLES_BATCH); i++) triangles.vertices[i] = 0.0f;
|
|
for (int i = 0; i < (4*3*MAX_TRIANGLES_BATCH); i++) triangles.colors[i] = 0;
|
|
|
|
triangles.vCounter = 0;
|
|
triangles.cCounter = 0;
|
|
|
|
// Initialize quads arrays (vertex position, texcoord and color data... and indexes)
|
|
quads.vertices = (float *)malloc(sizeof(float)*3*4*MAX_QUADS_BATCH); // 3 float by vertex, 4 vertex by quad
|
|
quads.texcoords = (float *)malloc(sizeof(float)*2*4*MAX_QUADS_BATCH); // 2 float by texcoord, 4 texcoord by quad
|
|
quads.colors = (unsigned char *)malloc(sizeof(unsigned char)*4*4*MAX_QUADS_BATCH); // 4 float by color, 4 colors by quad
|
|
#if defined(GRAPHICS_API_OPENGL_33)
|
|
quads.indices = (unsigned int *)malloc(sizeof(int)*6*MAX_QUADS_BATCH); // 6 int by quad (indices)
|
|
#elif defined(GRAPHICS_API_OPENGL_ES2)
|
|
quads.indices = (unsigned short *)malloc(sizeof(short)*6*MAX_QUADS_BATCH); // 6 int by quad (indices)
|
|
#endif
|
|
|
|
|
|
for (int i = 0; i < (3*4*MAX_QUADS_BATCH); i++) quads.vertices[i] = 0.0f;
|
|
for (int i = 0; i < (2*4*MAX_QUADS_BATCH); i++) quads.texcoords[i] = 0.0f;
|
|
for (int i = 0; i < (4*4*MAX_QUADS_BATCH); i++) quads.colors[i] = 0;
|
|
|
|
int k = 0;
|
|
|
|
// Indices can be initialized right now
|
|
for (int i = 0; i < (6*MAX_QUADS_BATCH); i+=6)
|
|
{
|
|
quads.indices[i] = 4*k;
|
|
quads.indices[i+1] = 4*k+1;
|
|
quads.indices[i+2] = 4*k+2;
|
|
quads.indices[i+3] = 4*k;
|
|
quads.indices[i+4] = 4*k+2;
|
|
quads.indices[i+5] = 4*k+3;
|
|
|
|
k++;
|
|
}
|
|
|
|
quads.vCounter = 0;
|
|
quads.tcCounter = 0;
|
|
quads.cCounter = 0;
|
|
|
|
TraceLog(INFO, "CPU buffers (lines, triangles, quads) initialized successfully");
|
|
}
|
|
|
|
// Initialize Vertex Array Objects (Contain VBO)
|
|
static void InitializeBuffersGPU(void)
|
|
{
|
|
if (vaoSupported)
|
|
{
|
|
// Initialize Lines VAO
|
|
glGenVertexArrays(1, &vaoLines);
|
|
glBindVertexArray(vaoLines);
|
|
}
|
|
|
|
// Create buffers for our vertex data
|
|
glGenBuffers(2, linesBuffer);
|
|
|
|
// Lines - Vertex positions buffer binding and attributes enable
|
|
glBindBuffer(GL_ARRAY_BUFFER, linesBuffer[0]);
|
|
glBufferData(GL_ARRAY_BUFFER, sizeof(float)*3*2*MAX_LINES_BATCH, lines.vertices, GL_DYNAMIC_DRAW);
|
|
glEnableVertexAttribArray(defaultVertexLoc);
|
|
glVertexAttribPointer(defaultVertexLoc, 3, GL_FLOAT, 0, 0, 0);
|
|
|
|
// Lines - colors buffer
|
|
glBindBuffer(GL_ARRAY_BUFFER, linesBuffer[1]);
|
|
glBufferData(GL_ARRAY_BUFFER, sizeof(unsigned char)*4*2*MAX_LINES_BATCH, lines.colors, GL_DYNAMIC_DRAW);
|
|
glEnableVertexAttribArray(defaultColorLoc);
|
|
glVertexAttribPointer(defaultColorLoc, 4, GL_UNSIGNED_BYTE, GL_TRUE, 0, 0);
|
|
|
|
if (vaoSupported) TraceLog(INFO, "[VAO ID %i] Lines VAO initialized successfully", vaoLines);
|
|
else TraceLog(INFO, "[VBO ID %i][VBO ID %i] Lines VBOs initialized successfully", linesBuffer[0], linesBuffer[1]);
|
|
//--------------------------------------------------------------
|
|
|
|
if (vaoSupported)
|
|
{
|
|
// Initialize Triangles VAO
|
|
glGenVertexArrays(1, &vaoTriangles);
|
|
glBindVertexArray(vaoTriangles);
|
|
}
|
|
|
|
// Create buffers for our vertex data
|
|
glGenBuffers(2, trianglesBuffer);
|
|
|
|
// Enable vertex attributes
|
|
glBindBuffer(GL_ARRAY_BUFFER, trianglesBuffer[0]);
|
|
glBufferData(GL_ARRAY_BUFFER, sizeof(float)*3*3*MAX_TRIANGLES_BATCH, triangles.vertices, GL_DYNAMIC_DRAW);
|
|
glEnableVertexAttribArray(defaultVertexLoc);
|
|
glVertexAttribPointer(defaultVertexLoc, 3, GL_FLOAT, 0, 0, 0);
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, trianglesBuffer[1]);
|
|
glBufferData(GL_ARRAY_BUFFER, sizeof(unsigned char)*4*3*MAX_TRIANGLES_BATCH, triangles.colors, GL_DYNAMIC_DRAW);
|
|
glEnableVertexAttribArray(defaultColorLoc);
|
|
glVertexAttribPointer(defaultColorLoc, 4, GL_UNSIGNED_BYTE, GL_TRUE, 0, 0);
|
|
|
|
if (vaoSupported) TraceLog(INFO, "[VAO ID %i] Triangles VAO initialized successfully", vaoTriangles);
|
|
else TraceLog(INFO, "[VBO ID %i][VBO ID %i] Triangles VBOs initialized successfully", trianglesBuffer[0], trianglesBuffer[1]);
|
|
//--------------------------------------------------------------
|
|
|
|
if (vaoSupported)
|
|
{
|
|
// Initialize Quads VAO
|
|
glGenVertexArrays(1, &vaoQuads);
|
|
glBindVertexArray(vaoQuads);
|
|
}
|
|
|
|
// Create buffers for our vertex data
|
|
glGenBuffers(4, quadsBuffer);
|
|
|
|
// Enable vertex attributes
|
|
glBindBuffer(GL_ARRAY_BUFFER, quadsBuffer[0]);
|
|
glBufferData(GL_ARRAY_BUFFER, sizeof(float)*3*4*MAX_QUADS_BATCH, quads.vertices, GL_DYNAMIC_DRAW);
|
|
glEnableVertexAttribArray(defaultVertexLoc);
|
|
glVertexAttribPointer(defaultVertexLoc, 3, GL_FLOAT, 0, 0, 0);
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, quadsBuffer[1]);
|
|
glBufferData(GL_ARRAY_BUFFER, sizeof(float)*2*4*MAX_QUADS_BATCH, quads.texcoords, GL_DYNAMIC_DRAW);
|
|
glEnableVertexAttribArray(defaultTexcoordLoc);
|
|
glVertexAttribPointer(defaultTexcoordLoc, 2, GL_FLOAT, 0, 0, 0);
|
|
|
|
glBindBuffer(GL_ARRAY_BUFFER, quadsBuffer[2]);
|
|
glBufferData(GL_ARRAY_BUFFER, sizeof(unsigned char)*4*4*MAX_QUADS_BATCH, quads.colors, GL_DYNAMIC_DRAW);
|
|
glEnableVertexAttribArray(defaultColorLoc);
|
|
glVertexAttribPointer(defaultColorLoc, 4, GL_UNSIGNED_BYTE, GL_TRUE, 0, 0);
|
|
|
|
// Fill index buffer
|
|
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, quadsBuffer[3]);
|
|
#if defined(GRAPHICS_API_OPENGL_33)
|
|
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(int)*6*MAX_QUADS_BATCH, quads.indices, GL_STATIC_DRAW);
|
|
#elif defined(GRAPHICS_API_OPENGL_ES2)
|
|
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(short)*6*MAX_QUADS_BATCH, quads.indices, GL_STATIC_DRAW);
|
|
#endif
|
|
|
|
if (vaoSupported) TraceLog(INFO, "[VAO ID %i] Quads VAO initialized successfully", vaoQuads);
|
|
else TraceLog(INFO, "[VBO ID %i][VBO ID %i][VBO ID %i][VBO ID %i] Quads VBOs initialized successfully", quadsBuffer[0], quadsBuffer[1], quadsBuffer[2], quadsBuffer[3]);
|
|
|
|
// Unbind the current VAO
|
|
if (vaoSupported) glBindVertexArray(0);
|
|
}
|
|
|
|
// Update VBOs with vertex array data
|
|
// TODO: If there is not vertex data, buffers doesn't need to be updated (vertexCount > 0)
|
|
// TODO: If no data changed on the CPU arrays --> No need to update GPU arrays every frame!
|
|
static void UpdateBuffers(void)
|
|
{
|
|
if (lines.vCounter > 0)
|
|
{
|
|
// Activate Lines VAO
|
|
if (vaoSupported) glBindVertexArray(vaoLines);
|
|
|
|
// Lines - vertex positions buffer
|
|
glBindBuffer(GL_ARRAY_BUFFER, linesBuffer[0]);
|
|
//glBufferData(GL_ARRAY_BUFFER, sizeof(float)*3*2*MAX_LINES_BATCH, lines.vertices, GL_DYNAMIC_DRAW);
|
|
glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(float)*3*lines.vCounter, lines.vertices); // target - offset (in bytes) - size (in bytes) - data pointer
|
|
|
|
// Lines - colors buffer
|
|
glBindBuffer(GL_ARRAY_BUFFER, linesBuffer[1]);
|
|
//glBufferData(GL_ARRAY_BUFFER, sizeof(float)*4*2*MAX_LINES_BATCH, lines.colors, GL_DYNAMIC_DRAW);
|
|
glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(unsigned char)*4*lines.cCounter, lines.colors);
|
|
}
|
|
//--------------------------------------------------------------
|
|
|
|
if (triangles.vCounter > 0)
|
|
{
|
|
// Activate Triangles VAO
|
|
if (vaoSupported) glBindVertexArray(vaoTriangles);
|
|
|
|
// Triangles - vertex positions buffer
|
|
glBindBuffer(GL_ARRAY_BUFFER, trianglesBuffer[0]);
|
|
//glBufferData(GL_ARRAY_BUFFER, sizeof(float)*3*3*MAX_TRIANGLES_BATCH, triangles.vertices, GL_DYNAMIC_DRAW);
|
|
glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(float)*3*triangles.vCounter, triangles.vertices);
|
|
|
|
// Triangles - colors buffer
|
|
glBindBuffer(GL_ARRAY_BUFFER, trianglesBuffer[1]);
|
|
//glBufferData(GL_ARRAY_BUFFER, sizeof(float)*4*3*MAX_TRIANGLES_BATCH, triangles.colors, GL_DYNAMIC_DRAW);
|
|
glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(unsigned char)*4*triangles.cCounter, triangles.colors);
|
|
}
|
|
//--------------------------------------------------------------
|
|
|
|
if (quads.vCounter > 0)
|
|
{
|
|
// Activate Quads VAO
|
|
if (vaoSupported) glBindVertexArray(vaoQuads);
|
|
|
|
// Quads - vertex positions buffer
|
|
glBindBuffer(GL_ARRAY_BUFFER, quadsBuffer[0]);
|
|
//glBufferData(GL_ARRAY_BUFFER, sizeof(float)*3*4*MAX_QUADS_BATCH, quads.vertices, GL_DYNAMIC_DRAW);
|
|
glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(float)*3*quads.vCounter, quads.vertices);
|
|
|
|
// Quads - texture coordinates buffer
|
|
glBindBuffer(GL_ARRAY_BUFFER, quadsBuffer[1]);
|
|
//glBufferData(GL_ARRAY_BUFFER, sizeof(float)*2*4*MAX_QUADS_BATCH, quads.texcoords, GL_DYNAMIC_DRAW);
|
|
glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(float)*2*quads.vCounter, quads.texcoords);
|
|
|
|
// Quads - colors buffer
|
|
glBindBuffer(GL_ARRAY_BUFFER, quadsBuffer[2]);
|
|
//glBufferData(GL_ARRAY_BUFFER, sizeof(float)*4*4*MAX_QUADS_BATCH, quads.colors, GL_DYNAMIC_DRAW);
|
|
glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(unsigned char)*4*quads.vCounter, quads.colors);
|
|
|
|
// Another option would be using buffer mapping...
|
|
//triangles.vertices = glMapBuffer(GL_ARRAY_BUFFER, GL_READ_WRITE);
|
|
// Now we can modify vertices
|
|
//glUnmapBuffer(GL_ARRAY_BUFFER);
|
|
}
|
|
//--------------------------------------------------------------
|
|
|
|
// Unbind the current VAO
|
|
if (vaoSupported) glBindVertexArray(0);
|
|
}
|
|
|
|
#endif //defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
|
|
|
|
#if defined(GRAPHICS_API_OPENGL_11)
|
|
|
|
// Mipmaps data is generated after image data
|
|
static int GenerateMipmaps(unsigned char *data, int baseWidth, int baseHeight)
|
|
{
|
|
int mipmapCount = 1; // Required mipmap levels count (including base level)
|
|
int width = baseWidth;
|
|
int height = baseHeight;
|
|
int size = baseWidth*baseHeight*4; // Size in bytes (will include mipmaps...)
|
|
|
|
// Count mipmap levels required
|
|
while ((width != 1) && (height != 1))
|
|
{
|
|
if (width != 1) width /= 2;
|
|
if (height != 1) height /= 2;
|
|
|
|
TraceLog(DEBUG, "Next mipmap size: %i x %i", width, height);
|
|
|
|
mipmapCount++;
|
|
|
|
size += (width*height*4); // Add mipmap size (in bytes)
|
|
}
|
|
|
|
TraceLog(DEBUG, "Total mipmaps required: %i", mipmapCount);
|
|
TraceLog(DEBUG, "Total size of data required: %i", size);
|
|
|
|
unsigned char *temp = realloc(data, size);
|
|
|
|
if (temp != NULL) data = temp;
|
|
else TraceLog(WARNING, "Mipmaps required memory could not be allocated");
|
|
|
|
width = baseWidth;
|
|
height = baseHeight;
|
|
size = (width*height*4);
|
|
|
|
// Generate mipmaps
|
|
// NOTE: Every mipmap data is stored after data
|
|
pixel *image = (pixel *)malloc(width*height*sizeof(pixel));
|
|
pixel *mipmap = NULL;
|
|
int offset = 0;
|
|
int j = 0;
|
|
|
|
for (int i = 0; i < size; i += 4)
|
|
{
|
|
image[j].r = data[i];
|
|
image[j].g = data[i + 1];
|
|
image[j].b = data[i + 2];
|
|
image[j].a = data[i + 3];
|
|
j++;
|
|
}
|
|
|
|
TraceLog(DEBUG, "Mipmap base (%ix%i)", width, height);
|
|
|
|
for (int mip = 1; mip < mipmapCount; mip++)
|
|
{
|
|
mipmap = GenNextMipmap(image, width, height);
|
|
|
|
offset += (width*height*4); // Size of last mipmap
|
|
j = 0;
|
|
|
|
width /= 2;
|
|
height /= 2;
|
|
size = (width*height*4); // Mipmap size to store after offset
|
|
|
|
// Add mipmap to data
|
|
for (int i = 0; i < size; i += 4)
|
|
{
|
|
data[offset + i] = mipmap[j].r;
|
|
data[offset + i + 1] = mipmap[j].g;
|
|
data[offset + i + 2] = mipmap[j].b;
|
|
data[offset + i + 3] = mipmap[j].a;
|
|
j++;
|
|
}
|
|
|
|
free(image);
|
|
|
|
image = mipmap;
|
|
mipmap = NULL;
|
|
}
|
|
|
|
free(mipmap); // free mipmap data
|
|
|
|
return mipmapCount;
|
|
}
|
|
|
|
// Manual mipmap generation (basic scaling algorithm)
|
|
static pixel *GenNextMipmap(pixel *srcData, int srcWidth, int srcHeight)
|
|
{
|
|
int x2, y2;
|
|
pixel prow, pcol;
|
|
|
|
int width = srcWidth / 2;
|
|
int height = srcHeight / 2;
|
|
|
|
pixel *mipmap = (pixel *)malloc(width*height*sizeof(pixel));
|
|
|
|
// Scaling algorithm works perfectly (box-filter)
|
|
for (int y = 0; y < height; y++)
|
|
{
|
|
y2 = 2 * y;
|
|
|
|
for (int x = 0; x < width; x++)
|
|
{
|
|
x2 = 2 * x;
|
|
|
|
prow.r = (srcData[y2*srcWidth + x2].r + srcData[y2*srcWidth + x2 + 1].r)/2;
|
|
prow.g = (srcData[y2*srcWidth + x2].g + srcData[y2*srcWidth + x2 + 1].g)/2;
|
|
prow.b = (srcData[y2*srcWidth + x2].b + srcData[y2*srcWidth + x2 + 1].b)/2;
|
|
prow.a = (srcData[y2*srcWidth + x2].a + srcData[y2*srcWidth + x2 + 1].a)/2;
|
|
|
|
pcol.r = (srcData[(y2+1)*srcWidth + x2].r + srcData[(y2+1)*srcWidth + x2 + 1].r)/2;
|
|
pcol.g = (srcData[(y2+1)*srcWidth + x2].g + srcData[(y2+1)*srcWidth + x2 + 1].g)/2;
|
|
pcol.b = (srcData[(y2+1)*srcWidth + x2].b + srcData[(y2+1)*srcWidth + x2 + 1].b)/2;
|
|
pcol.a = (srcData[(y2+1)*srcWidth + x2].a + srcData[(y2+1)*srcWidth + x2 + 1].a)/2;
|
|
|
|
mipmap[y*width + x].r = (prow.r + pcol.r)/2;
|
|
mipmap[y*width + x].g = (prow.g + pcol.g)/2;
|
|
mipmap[y*width + x].b = (prow.b + pcol.b)/2;
|
|
mipmap[y*width + x].a = (prow.a + pcol.a)/2;
|
|
}
|
|
}
|
|
|
|
TraceLog(DEBUG, "Mipmap generated successfully (%ix%i)", width, height);
|
|
|
|
return mipmap;
|
|
}
|
|
|
|
#endif
|
|
|
|
#if defined(RLGL_STANDALONE)
|
|
|
|
typedef enum { INFO = 0, ERROR, WARNING, DEBUG, OTHER } TraceLogType;
|
|
|
|
// Output a trace log message
|
|
// NOTE: Expected msgType: (0)Info, (1)Error, (2)Warning
|
|
void TraceLog(int msgType, const char *text, ...)
|
|
{
|
|
va_list args;
|
|
va_start(args, text);
|
|
|
|
switch(msgType)
|
|
{
|
|
case INFO: fprintf(stdout, "INFO: "); break;
|
|
case ERROR: fprintf(stdout, "ERROR: "); break;
|
|
case WARNING: fprintf(stdout, "WARNING: "); break;
|
|
case DEBUG: fprintf(stdout, "DEBUG: "); break;
|
|
default: break;
|
|
}
|
|
|
|
vfprintf(stdout, text, args);
|
|
fprintf(stdout, "\n");
|
|
|
|
va_end(args);
|
|
|
|
if (msgType == ERROR) exit(1);
|
|
}
|
|
#endif |