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raylib/src/rlgl.h
raysan5 dcf5f45f68 Add lighting system -IN PROGRESS- 
Improved materials
2016-05-20 12:28:07 +02:00

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/**********************************************************************************************
*
* rlgl - raylib OpenGL abstraction layer
*
* raylib now uses OpenGL 1.1 style functions (rlVertex) that are mapped to selected OpenGL version:
* OpenGL 1.1 - Direct map rl* -> gl*
* OpenGL 3.3 - Vertex data is stored in VAOs, call rlglDraw() to render
* OpenGL ES 2 - Vertex data is stored in VBOs or VAOs (when available), call rlglDraw() to render
*
* Copyright (c) 2014 Ramon Santamaria (@raysan5)
*
* This software is provided "as-is", without any express or implied warranty. In no event
* will the authors be held liable for any damages arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose, including commercial
* applications, and to alter it and redistribute it freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not claim that you
* wrote the original software. If you use this software in a product, an acknowledgment
* in the product documentation would be appreciated but is not required.
*
* 2. Altered source versions must be plainly marked as such, and must not be misrepresented
* as being the original software.
*
* 3. This notice may not be removed or altered from any source distribution.
*
**********************************************************************************************/
#ifndef RLGL_H
#define RLGL_H
//#define RLGL_STANDALONE // NOTE: To use rlgl as standalone lib, just uncomment this line
#ifndef RLGL_STANDALONE
#include "raylib.h" // Required for typedef(s): Model, Shader, Texture2D
#include "utils.h" // Required for function TraceLog()
#endif
#ifdef RLGL_STANDALONE
#define RAYMATH_STANDALONE
#endif
#include "raymath.h" // Required for types: Vector3, Matrix
// Select desired OpenGL version
// NOTE: Those preprocessor defines are only used on rlgl module,
// if OpenGL version is required by any other module, it uses rlGetVersion()
// Choose opengl version here or just define it at compile time: -DGRAPHICS_API_OPENGL_33
//#define GRAPHICS_API_OPENGL_11 // Only available on PLATFORM_DESKTOP
//#define GRAPHICS_API_OPENGL_33 // Only available on PLATFORM_DESKTOP
//#define GRAPHICS_API_OPENGL_ES2 // Only available on PLATFORM_ANDROID or PLATFORM_RPI or PLATFORM_WEB
// Security check in case no GRAPHICS_API_OPENGL_* defined
#if !defined(GRAPHICS_API_OPENGL_11) && !defined(GRAPHICS_API_OPENGL_33) && !defined(GRAPHICS_API_OPENGL_ES2)
#define GRAPHICS_API_OPENGL_11
#endif
// Security check in case multiple GRAPHICS_API_OPENGL_* defined
#if defined(GRAPHICS_API_OPENGL_11)
#if defined(GRAPHICS_API_OPENGL_33)
#undef GRAPHICS_API_OPENGL_33
#endif
#if defined(GRAPHICS_API_OPENGL_ES2)
#undef GRAPHICS_API_OPENGL_ES2
#endif
#endif
//----------------------------------------------------------------------------------
// Defines and Macros
//----------------------------------------------------------------------------------
#if defined(GRAPHICS_API_OPENGL_11) || defined(GRAPHICS_API_OPENGL_33)
// NOTE: This is the maximum amount of lines, triangles and quads per frame, be careful!
#define MAX_LINES_BATCH 8192
#define MAX_TRIANGLES_BATCH 4096
#define MAX_QUADS_BATCH 4096
#elif defined(GRAPHICS_API_OPENGL_ES2)
// NOTE: Reduce memory sizes for embedded systems (RPI and HTML5)
// NOTE: On HTML5 (emscripten) this is allocated on heap, by default it's only 16MB!...just take care...
#define MAX_LINES_BATCH 1024 // Critical for wire shapes (sphere)
#define MAX_TRIANGLES_BATCH 2048 // Critical for some shapes (sphere)
#define MAX_QUADS_BATCH 1024 // Be careful with text, every letter maps a quad
#endif
//----------------------------------------------------------------------------------
// Types and Structures Definition
//----------------------------------------------------------------------------------
typedef enum { RL_PROJECTION, RL_MODELVIEW, RL_TEXTURE } MatrixMode;
typedef enum { RL_LINES, RL_TRIANGLES, RL_QUADS } DrawMode;
typedef enum { OPENGL_11 = 1, OPENGL_33, OPENGL_ES_20 } GlVersion;
#if defined(RLGL_STANDALONE)
#ifndef __cplusplus
// Boolean type
typedef enum { false, true } bool;
#endif
// byte type
typedef unsigned char byte;
// Color type, RGBA (32bit)
typedef struct Color {
unsigned char r;
unsigned char g;
unsigned char b;
unsigned char a;
} Color;
// Texture formats (support depends on OpenGL version)
typedef enum {
UNCOMPRESSED_GRAYSCALE = 1, // 8 bit per pixel (no alpha)
UNCOMPRESSED_GRAY_ALPHA,
UNCOMPRESSED_R5G6B5, // 16 bpp
UNCOMPRESSED_R8G8B8, // 24 bpp
UNCOMPRESSED_R5G5B5A1, // 16 bpp (1 bit alpha)
UNCOMPRESSED_R4G4B4A4, // 16 bpp (4 bit alpha)
UNCOMPRESSED_R8G8B8A8, // 32 bpp
COMPRESSED_DXT1_RGB, // 4 bpp (no alpha)
COMPRESSED_DXT1_RGBA, // 4 bpp (1 bit alpha)
COMPRESSED_DXT3_RGBA, // 8 bpp
COMPRESSED_DXT5_RGBA, // 8 bpp
COMPRESSED_ETC1_RGB, // 4 bpp
COMPRESSED_ETC2_RGB, // 4 bpp
COMPRESSED_ETC2_EAC_RGBA, // 8 bpp
COMPRESSED_PVRT_RGB, // 4 bpp
COMPRESSED_PVRT_RGBA, // 4 bpp
COMPRESSED_ASTC_4x4_RGBA, // 8 bpp
COMPRESSED_ASTC_8x8_RGBA // 2 bpp
} TextureFormat;
// Bounding box type
typedef struct BoundingBox {
Vector3 min;
Vector3 max;
} BoundingBox;
// Vertex data definning a mesh
typedef struct Mesh {
int vertexCount; // number of vertices stored in arrays
float *vertices; // vertex position (XYZ - 3 components per vertex) (shader-location = 0)
float *texcoords; // vertex texture coordinates (UV - 2 components per vertex) (shader-location = 1)
float *texcoords2; // vertex second texture coordinates (useful for lightmaps) (shader-location = 5)
float *normals; // vertex normals (XYZ - 3 components per vertex) (shader-location = 2)
float *tangents; // vertex tangents (XYZ - 3 components per vertex) (shader-location = 4)
unsigned char *colors; // vertex colors (RGBA - 4 components per vertex) (shader-location = 3)
unsigned short *indices; // vertex indices (in case vertex data comes indexed)
int triangleCount; // number of triangles stored (indexed or not)
BoundingBox bounds; // mesh limits defined by min and max points
unsigned int vaoId; // OpenGL Vertex Array Object id
unsigned int vboId[7]; // OpenGL Vertex Buffer Objects id (7 types of vertex data)
} Mesh;
// Shader type (generic shader)
typedef struct Shader {
unsigned int id; // Shader program id
// Vertex attributes locations (default locations)
int vertexLoc; // Vertex attribute location point (default-location = 0)
int texcoordLoc; // Texcoord attribute location point (default-location = 1)
int normalLoc; // Normal attribute location point (default-location = 2)
int colorLoc; // Color attibute location point (default-location = 3)
int tangentLoc; // Tangent attribute location point (default-location = 4)
int texcoord2Loc; // Texcoord2 attribute location point (default-location = 5)
// Uniform locations
int mvpLoc; // ModelView-Projection matrix uniform location point (vertex shader)
int tintColorLoc; // Color uniform location point (fragment shader)
// Texture map locations
int mapDiffuseLoc; // Diffuse map texture uniform location point (fragment shader)
int mapNormalLoc; // Normal map texture uniform location point (fragment shader)
int mapSpecularLoc; // Specular map texture uniform location point (fragment shader)
} Shader;
// Texture2D type
// NOTE: Data stored in GPU memory
typedef struct Texture2D {
unsigned int id; // OpenGL texture id
int width; // Texture base width
int height; // Texture base height
int mipmaps; // Mipmap levels, 1 by default
int format; // Data format (TextureFormat)
} Texture2D;
// RenderTexture2D type, for texture rendering
typedef struct RenderTexture2D {
unsigned int id; // Render texture (fbo) id
Texture2D texture; // Color buffer attachment texture
Texture2D depth; // Depth buffer attachment texture
} RenderTexture2D;
// Material type
typedef struct Material {
Shader shader;
Texture2D texDiffuse; // Diffuse texture
Texture2D texNormal; // Normal texture
Texture2D texSpecular; // Specular texture
Color colDiffuse;
Color colAmbient;
Color colSpecular;
float glossiness;
float normalDepth;
} Material;
// Light type
// TODO: Review contained data to support different light types and features
typedef struct LightData {
int id;
int type; // LIGHT_POINT, LIGHT_DIRECTIONAL, LIGHT_SPOT
bool enabled;
Vector3 position;
Vector3 direction; // Used on LIGHT_DIRECTIONAL and LIGHT_SPOT (cone direction)
float attenuation; // Lost of light intensity with distance (use radius?)
Color diffuse; // Use Vector3 diffuse (including intensities)?
float intensity;
Color specular;
//float specFactor; // Specular intensity ?
//Color ambient; // Required?
float coneAngle; // SpotLight
} LightData, *Light;
// Color blending modes (pre-defined)
typedef enum { BLEND_ALPHA = 0, BLEND_ADDITIVE, BLEND_MULTIPLIED } BlendMode;
#endif
#ifdef __cplusplus
extern "C" { // Prevents name mangling of functions
#endif
//------------------------------------------------------------------------------------
// Functions Declaration - Matrix operations
//------------------------------------------------------------------------------------
void rlMatrixMode(int mode); // Choose the current matrix to be transformed
void rlPushMatrix(void); // Push the current matrix to stack
void rlPopMatrix(void); // Pop lattest inserted matrix from stack
void rlLoadIdentity(void); // Reset current matrix to identity matrix
void rlTranslatef(float x, float y, float z); // Multiply the current matrix by a translation matrix
void rlRotatef(float angleDeg, float x, float y, float z); // Multiply the current matrix by a rotation matrix
void rlScalef(float x, float y, float z); // Multiply the current matrix by a scaling matrix
void rlMultMatrixf(float *mat); // Multiply the current matrix by another matrix
void rlFrustum(double left, double right, double bottom, double top, double near, double far);
void rlOrtho(double left, double right, double bottom, double top, double near, double far);
//------------------------------------------------------------------------------------
// Functions Declaration - Vertex level operations
//------------------------------------------------------------------------------------
void rlBegin(int mode); // Initialize drawing mode (how to organize vertex)
void rlEnd(void); // Finish vertex providing
void rlVertex2i(int x, int y); // Define one vertex (position) - 2 int
void rlVertex2f(float x, float y); // Define one vertex (position) - 2 float
void rlVertex3f(float x, float y, float z); // Define one vertex (position) - 3 float
void rlTexCoord2f(float x, float y); // Define one vertex (texture coordinate) - 2 float
void rlNormal3f(float x, float y, float z); // Define one vertex (normal) - 3 float
void rlColor4ub(byte r, byte g, byte b, byte a); // Define one vertex (color) - 4 byte
void rlColor3f(float x, float y, float z); // Define one vertex (color) - 3 float
void rlColor4f(float x, float y, float z, float w); // Define one vertex (color) - 4 float
//------------------------------------------------------------------------------------
// Functions Declaration - OpenGL equivalent functions (common to 1.1, 3.3+, ES2)
// NOTE: This functions are used to completely abstract raylib code from OpenGL layer
//------------------------------------------------------------------------------------
void rlEnableTexture(unsigned int id); // Enable texture usage
void rlDisableTexture(void); // Disable texture usage
void rlEnableRenderTexture(unsigned int id); // Enable render texture (fbo)
void rlDisableRenderTexture(void); // Disable render texture (fbo), return to default framebuffer
void rlEnableDepthTest(void); // Enable depth test
void rlDisableDepthTest(void); // Disable depth test
void rlEnableWireMode(void); // Enable wire mode
void rlDisableWireMode(void); // Disable wire mode
void rlDeleteTextures(unsigned int id); // Delete OpenGL texture from GPU
void rlDeleteRenderTextures(RenderTexture2D target); // Delete render textures (fbo) from GPU
void rlDeleteShader(unsigned int id); // Delete OpenGL shader program from GPU
void rlDeleteVertexArrays(unsigned int id); // Unload vertex data (VAO) from GPU memory
void rlDeleteBuffers(unsigned int id); // Unload vertex data (VBO) from GPU memory
void rlClearColor(byte r, byte g, byte b, byte a); // Clear color buffer with color
void rlClearScreenBuffers(void); // Clear used screen buffers (color and depth)
int rlGetVersion(void); // Returns current OpenGL version
//------------------------------------------------------------------------------------
// Functions Declaration - rlgl functionality
//------------------------------------------------------------------------------------
void rlglInit(void); // Initialize rlgl (shaders, VAO, VBO...)
void rlglClose(void); // De-init rlgl
void rlglDraw(void); // Draw VAO/VBO
void rlglInitGraphics(int offsetX, int offsetY, int width, int height); // Initialize Graphics (OpenGL stuff)
unsigned int rlglLoadTexture(void *data, int width, int height, int textureFormat, int mipmapCount); // Load texture in GPU
RenderTexture2D rlglLoadRenderTexture(int width, int height); // Load a texture to be used for rendering (fbo with color and depth attachments)
void rlglUpdateTexture(unsigned int id, int width, int height, int format, void *data); // Update GPU texture with new data
void rlglGenerateMipmaps(Texture2D texture); // Generate mipmap data for selected texture
void rlglLoadMesh(Mesh *mesh, bool dynamic); // Upload vertex data into GPU and provided VAO/VBO ids
void rlglUpdateMesh(Mesh mesh, int buffer, int numVertex); // Update vertex data on GPU (upload new data to one buffer)
void rlglDrawMesh(Mesh mesh, Material material, Matrix transform); // Draw a 3d mesh with material and transform
void rlglUnloadMesh(Mesh *mesh); // Unload mesh data from CPU and GPU
Vector3 rlglUnproject(Vector3 source, Matrix proj, Matrix view); // Get world coordinates from screen coordinates
unsigned char *rlglReadScreenPixels(int width, int height); // Read screen pixel data (color buffer)
void *rlglReadTexturePixels(Texture2D texture); // Read texture pixel data
// NOTE: There is a set of shader related functions that are available to end user,
// to avoid creating function wrappers through core module, they have been directly declared in raylib.h
#if defined(RLGL_STANDALONE)
//------------------------------------------------------------------------------------
// Shaders System Functions (Module: rlgl)
// NOTE: This functions are useless when using OpenGL 1.1
//------------------------------------------------------------------------------------
Shader LoadShader(char *vsFileName, char *fsFileName); // Load a custom shader and bind default locations
void UnloadShader(Shader shader); // Unload a custom shader from memory
void SetCustomShader(Shader shader); // Set custom shader to be used in batch draw
void SetDefaultShader(void); // Set default shader to be used in batch draw
Shader GetDefaultShader(void); // Get default shader
Texture2D GetDefaultTexture(void); // Get default texture
int GetShaderLocation(Shader shader, const char *uniformName); // Get shader uniform location
void SetShaderValue(Shader shader, int uniformLoc, float *value, int size); // Set shader uniform value (float)
void SetShaderValuei(Shader shader, int uniformLoc, int *value, int size); // Set shader uniform value (int)
void SetShaderValueMatrix(Shader shader, int uniformLoc, Matrix mat); // Set shader uniform value (matrix 4x4)
void SetBlendMode(int mode); // Set blending mode (alpha, additive, multiplied)
Light CreateLight(int type, Vector3 position, Color diffuse); // Create a new light, initialize it and add to pool
void DestroyLight(Light light); // Destroy a light and take it out of the list
#endif
#ifdef __cplusplus
}
#endif
#endif // RLGL_H
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