470 lines
21 KiB
C
470 lines
21 KiB
C
/*******************************************************************************************
|
|
*
|
|
* raylib [rlgl] example - Using rlgl module as standalone module
|
|
*
|
|
* rlgl library is an abstraction layer for multiple OpenGL versions (1.1, 2.1, 3.3 Core, ES 2.0)
|
|
* that provides a pseudo-OpenGL 1.1 immediate-mode style API (rlVertex, rlTranslate, rlRotate...)
|
|
*
|
|
* NOTE: This example requires OpenGL 3.3 or OpenGL ES 2.0 for shaders support,
|
|
* OpenGL 1.1 does not support shaders but it can also be used.
|
|
*
|
|
* DEPENDENCIES:
|
|
* glfw3 - Windows and context initialization library
|
|
* rlgl.h - OpenGL abstraction layer to OpenGL 1.1, 3.3 or ES2
|
|
* glad.h - OpenGL extensions initialization library (required by rlgl)
|
|
* raymath.h - 3D math library
|
|
*
|
|
* WINDOWS COMPILATION:
|
|
* gcc -o rlgl_standalone.exe rlgl_standalone.c -s -Iexternal\include -I..\..\src \
|
|
* -L. -Lexternal\lib -lglfw3 -lopengl32 -lgdi32 -Wall -std=c99 -DGRAPHICS_API_OPENGL_33
|
|
*
|
|
* APPLE COMPILATION:
|
|
* gcc -o rlgl_standalone rlgl_standalone.c -I../../src -Iexternal/include -Lexternal/lib \
|
|
* -lglfw3 -framework CoreVideo -framework OpenGL -framework IOKit -framework Cocoa
|
|
* -Wno-deprecated-declarations -std=c99 -DGRAPHICS_API_OPENGL_33
|
|
*
|
|
*
|
|
* LICENSE: zlib/libpng
|
|
*
|
|
* This example is licensed under an unmodified zlib/libpng license, which is an OSI-certified,
|
|
* BSD-like license that allows static linking with closed source software:
|
|
*
|
|
* Copyright (c) 2014-2023 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.
|
|
*
|
|
********************************************************************************************/
|
|
|
|
// NOTE: rlgl can be configured just re-defining the following values:
|
|
//#define RL_DEFAULT_BATCH_BUFFER_ELEMENTS 8192 // Default internal render batch elements limits
|
|
//#define RL_DEFAULT_BATCH_BUFFERS 1 // Default number of batch buffers (multi-buffering)
|
|
//#define RL_DEFAULT_BATCH_DRAWCALLS 256 // Default number of batch draw calls (by state changes: mode, texture)
|
|
//#define RL_DEFAULT_BATCH_MAX_TEXTURE_UNITS 4 // Maximum number of textures units that can be activated on batch drawing (SetShaderValueTexture())
|
|
//#define RL_MAX_MATRIX_STACK_SIZE 32 // Maximum size of internal Matrix stack
|
|
//#define RL_MAX_SHADER_LOCATIONS 32 // Maximum number of shader locations supported
|
|
//#define RL_CULL_DISTANCE_NEAR 0.01 // Default projection matrix near cull distance
|
|
//#define RL_CULL_DISTANCE_FAR 1000.0 // Default projection matrix far cull distance
|
|
|
|
#define RLGL_IMPLEMENTATION
|
|
#include "rlgl.h" // OpenGL abstraction layer to OpenGL 1.1, 3.3+ or ES2
|
|
|
|
#define RAYMATH_STATIC_INLINE
|
|
#include "raymath.h" // Vector2, Vector3, Quaternion and Matrix functionality
|
|
|
|
#if defined(__EMSCRIPTEN__)
|
|
#define GLFW_INCLUDE_ES2
|
|
#endif
|
|
#include "GLFW/glfw3.h" // Windows/Context and inputs management
|
|
|
|
#include <stdio.h> // Required for: printf()
|
|
|
|
#define RED (Color){ 230, 41, 55, 255 } // Red
|
|
#define RAYWHITE (Color){ 245, 245, 245, 255 } // My own White (raylib logo)
|
|
#define DARKGRAY (Color){ 80, 80, 80, 255 } // Dark Gray
|
|
|
|
//----------------------------------------------------------------------------------
|
|
// Structures Definition
|
|
//----------------------------------------------------------------------------------
|
|
// Color, 4 components, R8G8B8A8 (32bit)
|
|
typedef struct Color {
|
|
unsigned char r; // Color red value
|
|
unsigned char g; // Color green value
|
|
unsigned char b; // Color blue value
|
|
unsigned char a; // Color alpha value
|
|
} Color;
|
|
|
|
// Camera type, defines a camera position/orientation in 3d space
|
|
typedef struct Camera {
|
|
Vector3 position; // Camera position
|
|
Vector3 target; // Camera target it looks-at
|
|
Vector3 up; // Camera up vector (rotation over its axis)
|
|
float fovy; // Camera field-of-view apperture in Y (degrees) in perspective, used as near plane width in orthographic
|
|
int projection; // Camera projection: CAMERA_PERSPECTIVE or CAMERA_ORTHOGRAPHIC
|
|
} Camera;
|
|
|
|
//----------------------------------------------------------------------------------
|
|
// Module specific Functions Declaration
|
|
//----------------------------------------------------------------------------------
|
|
static void ErrorCallback(int error, const char *description);
|
|
static void KeyCallback(GLFWwindow *window, int key, int scancode, int action, int mods);
|
|
|
|
// Drawing functions (uses rlgl functionality)
|
|
static void DrawGrid(int slices, float spacing);
|
|
static void DrawCube(Vector3 position, float width, float height, float length, Color color);
|
|
static void DrawCubeWires(Vector3 position, float width, float height, float length, Color color);
|
|
static void DrawRectangleV(Vector2 position, Vector2 size, Color color);
|
|
|
|
// NOTE: We use raymath to get this functionality but it could be implemented in this module
|
|
//static Matrix MatrixIdentity(void);
|
|
//static Matrix MatrixOrtho(double left, double right, double bottom, double top, double near, double far);
|
|
//static Matrix MatrixPerspective(double fovy, double aspect, double near, double far);
|
|
//static Matrix MatrixLookAt(Vector3 eye, Vector3 target, Vector3 up);
|
|
|
|
//------------------------------------------------------------------------------------
|
|
// Program main entry point
|
|
//------------------------------------------------------------------------------------
|
|
int main(void)
|
|
{
|
|
// Initialization
|
|
//--------------------------------------------------------------------------------------
|
|
const int screenWidth = 800;
|
|
const int screenHeight = 450;
|
|
|
|
// GLFW3 Initialization + OpenGL 3.3 Context + Extensions
|
|
//--------------------------------------------------------
|
|
glfwSetErrorCallback(ErrorCallback);
|
|
|
|
if (!glfwInit())
|
|
{
|
|
printf("GLFW3: Can not initialize GLFW\n");
|
|
return 1;
|
|
}
|
|
else printf("GLFW3: GLFW initialized successfully\n");
|
|
|
|
glfwWindowHint(GLFW_SAMPLES, 4);
|
|
glfwWindowHint(GLFW_DEPTH_BITS, 16);
|
|
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
|
|
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
|
|
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
|
|
//glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, GL_TRUE);
|
|
#if defined(__APPLE__)
|
|
glfwWindowHint( GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE );
|
|
#endif
|
|
|
|
GLFWwindow *window = glfwCreateWindow(screenWidth, screenHeight, "rlgl standalone", NULL, NULL);
|
|
|
|
if (!window)
|
|
{
|
|
glfwTerminate();
|
|
return 2;
|
|
}
|
|
else printf("GLFW3: Window created successfully\n");
|
|
|
|
glfwSetWindowPos(window, 200, 200);
|
|
|
|
glfwSetKeyCallback(window, KeyCallback);
|
|
|
|
glfwMakeContextCurrent(window);
|
|
glfwSwapInterval(0);
|
|
|
|
// Load OpenGL 3.3 supported extensions
|
|
rlLoadExtensions(glfwGetProcAddress);
|
|
//--------------------------------------------------------
|
|
|
|
// Initialize OpenGL context (states and resources)
|
|
rlglInit(screenWidth, screenHeight);
|
|
|
|
// Initialize viewport and internal projection/modelview matrices
|
|
rlViewport(0, 0, screenWidth, screenHeight);
|
|
rlMatrixMode(RL_PROJECTION); // Switch to PROJECTION matrix
|
|
rlLoadIdentity(); // Reset current matrix (PROJECTION)
|
|
rlOrtho(0, screenWidth, screenHeight, 0, 0.0f, 1.0f); // Orthographic projection with top-left corner at (0,0)
|
|
rlMatrixMode(RL_MODELVIEW); // Switch back to MODELVIEW matrix
|
|
rlLoadIdentity(); // Reset current matrix (MODELVIEW)
|
|
|
|
rlClearColor(245, 245, 245, 255); // Define clear color
|
|
rlEnableDepthTest(); // Enable DEPTH_TEST for 3D
|
|
|
|
Camera camera = { 0 };
|
|
camera.position = (Vector3){ 5.0f, 5.0f, 5.0f }; // Camera position
|
|
camera.target = (Vector3){ 0.0f, 0.0f, 0.0f }; // Camera looking at point
|
|
camera.up = (Vector3){ 0.0f, 1.0f, 0.0f }; // Camera up vector (rotation towards target)
|
|
camera.fovy = 45.0f; // Camera field-of-view Y
|
|
|
|
Vector3 cubePosition = { 0.0f, 0.0f, 0.0f }; // Cube default position (center)
|
|
//--------------------------------------------------------------------------------------
|
|
|
|
// Main game loop
|
|
while (!glfwWindowShouldClose(window))
|
|
{
|
|
// Update
|
|
//----------------------------------------------------------------------------------
|
|
//camera.position.x += 0.01f;
|
|
//----------------------------------------------------------------------------------
|
|
|
|
// Draw
|
|
//----------------------------------------------------------------------------------
|
|
rlClearScreenBuffers(); // Clear current framebuffer
|
|
|
|
// Draw '3D' elements in the scene
|
|
//-----------------------------------------------
|
|
// Calculate projection matrix (from perspective) and view matrix from camera look at
|
|
Matrix matProj = MatrixPerspective((double)(camera.fovy*DEG2RAD), (double)screenWidth/(double)screenHeight, 0.01, 1000.0);
|
|
Matrix matView = MatrixLookAt(camera.position, camera.target, camera.up);
|
|
|
|
rlSetMatrixModelview(matView); // Set internal modelview matrix (default shader)
|
|
rlSetMatrixProjection(matProj); // Set internal projection matrix (default shader)
|
|
|
|
DrawCube(cubePosition, 2.0f, 2.0f, 2.0f, RED);
|
|
DrawCubeWires(cubePosition, 2.0f, 2.0f, 2.0f, RAYWHITE);
|
|
DrawGrid(10, 1.0f);
|
|
|
|
// Draw internal render batch buffers (3D data)
|
|
rlDrawRenderBatchActive();
|
|
//-----------------------------------------------
|
|
|
|
// Draw '2D' elements in the scene (GUI)
|
|
//-----------------------------------------------
|
|
#define RLGL_SET_MATRIX_MANUALLY
|
|
#if defined(RLGL_SET_MATRIX_MANUALLY)
|
|
matProj = MatrixOrtho(0.0, screenWidth, screenHeight, 0.0, 0.0, 1.0);
|
|
matView = MatrixIdentity();
|
|
|
|
rlSetMatrixModelview(matView); // Set internal modelview matrix (default shader)
|
|
rlSetMatrixProjection(matProj); // Set internal projection matrix (default shader)
|
|
|
|
#else // Let rlgl generate and multiply matrix internally
|
|
|
|
rlMatrixMode(RL_PROJECTION); // Enable internal projection matrix
|
|
rlLoadIdentity(); // Reset internal projection matrix
|
|
rlOrtho(0.0, screenWidth, screenHeight, 0.0, 0.0, 1.0); // Recalculate internal projection matrix
|
|
rlMatrixMode(RL_MODELVIEW); // Enable internal modelview matrix
|
|
rlLoadIdentity(); // Reset internal modelview matrix
|
|
#endif
|
|
DrawRectangleV((Vector2){ 10.0f, 10.0f }, (Vector2){ 780.0f, 20.0f }, DARKGRAY);
|
|
|
|
// Draw internal render batch buffers (2D data)
|
|
rlDrawRenderBatchActive();
|
|
//-----------------------------------------------
|
|
|
|
glfwSwapBuffers(window);
|
|
glfwPollEvents();
|
|
//----------------------------------------------------------------------------------
|
|
}
|
|
|
|
// De-Initialization
|
|
//--------------------------------------------------------------------------------------
|
|
rlglClose(); // Unload rlgl internal buffers and default shader/texture
|
|
|
|
glfwDestroyWindow(window); // Close window
|
|
glfwTerminate(); // Free GLFW3 resources
|
|
//--------------------------------------------------------------------------------------
|
|
|
|
return 0;
|
|
}
|
|
|
|
//----------------------------------------------------------------------------------
|
|
// Module specific Functions Definitions
|
|
//----------------------------------------------------------------------------------
|
|
|
|
// GLFW3: Error callback
|
|
static void ErrorCallback(int error, const char *description)
|
|
{
|
|
fprintf(stderr, "%s", description);
|
|
}
|
|
|
|
// GLFW3: Keyboard callback
|
|
static void KeyCallback(GLFWwindow *window, int key, int scancode, int action, int mods)
|
|
{
|
|
if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
|
|
{
|
|
glfwSetWindowShouldClose(window, GL_TRUE);
|
|
}
|
|
}
|
|
|
|
// Draw rectangle using rlgl OpenGL 1.1 style coding (translated to OpenGL 3.3 internally)
|
|
static void DrawRectangleV(Vector2 position, Vector2 size, Color color)
|
|
{
|
|
rlBegin(RL_TRIANGLES);
|
|
rlColor4ub(color.r, color.g, color.b, color.a);
|
|
|
|
rlVertex2f(position.x, position.y);
|
|
rlVertex2f(position.x, position.y + size.y);
|
|
rlVertex2f(position.x + size.x, position.y + size.y);
|
|
|
|
rlVertex2f(position.x, position.y);
|
|
rlVertex2f(position.x + size.x, position.y + size.y);
|
|
rlVertex2f(position.x + size.x, position.y);
|
|
rlEnd();
|
|
}
|
|
|
|
// Draw a grid centered at (0, 0, 0)
|
|
static void DrawGrid(int slices, float spacing)
|
|
{
|
|
int halfSlices = slices / 2;
|
|
|
|
rlBegin(RL_LINES);
|
|
for (int i = -halfSlices; i <= halfSlices; i++)
|
|
{
|
|
if (i == 0)
|
|
{
|
|
rlColor3f(0.5f, 0.5f, 0.5f);
|
|
rlColor3f(0.5f, 0.5f, 0.5f);
|
|
rlColor3f(0.5f, 0.5f, 0.5f);
|
|
rlColor3f(0.5f, 0.5f, 0.5f);
|
|
}
|
|
else
|
|
{
|
|
rlColor3f(0.75f, 0.75f, 0.75f);
|
|
rlColor3f(0.75f, 0.75f, 0.75f);
|
|
rlColor3f(0.75f, 0.75f, 0.75f);
|
|
rlColor3f(0.75f, 0.75f, 0.75f);
|
|
}
|
|
|
|
rlVertex3f((float)i*spacing, 0.0f, (float)-halfSlices*spacing);
|
|
rlVertex3f((float)i*spacing, 0.0f, (float)halfSlices*spacing);
|
|
|
|
rlVertex3f((float)-halfSlices*spacing, 0.0f, (float)i*spacing);
|
|
rlVertex3f((float)halfSlices*spacing, 0.0f, (float)i*spacing);
|
|
}
|
|
rlEnd();
|
|
}
|
|
|
|
// Draw cube
|
|
// NOTE: Cube position is the center position
|
|
static void DrawCube(Vector3 position, float width, float height, float length, Color color)
|
|
{
|
|
float x = 0.0f;
|
|
float y = 0.0f;
|
|
float z = 0.0f;
|
|
|
|
rlPushMatrix();
|
|
|
|
// NOTE: Be careful! Function order matters (rotate -> scale -> translate)
|
|
rlTranslatef(position.x, position.y, position.z);
|
|
//rlScalef(2.0f, 2.0f, 2.0f);
|
|
//rlRotatef(45, 0, 1, 0);
|
|
|
|
rlBegin(RL_TRIANGLES);
|
|
rlColor4ub(color.r, color.g, color.b, color.a);
|
|
|
|
// Front Face -----------------------------------------------------
|
|
rlVertex3f(x-width/2, y-height/2, z+length/2); // Bottom Left
|
|
rlVertex3f(x+width/2, y-height/2, z+length/2); // Bottom Right
|
|
rlVertex3f(x-width/2, y+height/2, z+length/2); // Top Left
|
|
|
|
rlVertex3f(x+width/2, y+height/2, z+length/2); // Top Right
|
|
rlVertex3f(x-width/2, y+height/2, z+length/2); // Top Left
|
|
rlVertex3f(x+width/2, y-height/2, z+length/2); // Bottom Right
|
|
|
|
// Back Face ------------------------------------------------------
|
|
rlVertex3f(x-width/2, y-height/2, z-length/2); // Bottom Left
|
|
rlVertex3f(x-width/2, y+height/2, z-length/2); // Top Left
|
|
rlVertex3f(x+width/2, y-height/2, z-length/2); // Bottom Right
|
|
|
|
rlVertex3f(x+width/2, y+height/2, z-length/2); // Top Right
|
|
rlVertex3f(x+width/2, y-height/2, z-length/2); // Bottom Right
|
|
rlVertex3f(x-width/2, y+height/2, z-length/2); // Top Left
|
|
|
|
// Top Face -------------------------------------------------------
|
|
rlVertex3f(x-width/2, y+height/2, z-length/2); // Top Left
|
|
rlVertex3f(x-width/2, y+height/2, z+length/2); // Bottom Left
|
|
rlVertex3f(x+width/2, y+height/2, z+length/2); // Bottom Right
|
|
|
|
rlVertex3f(x+width/2, y+height/2, z-length/2); // Top Right
|
|
rlVertex3f(x-width/2, y+height/2, z-length/2); // Top Left
|
|
rlVertex3f(x+width/2, y+height/2, z+length/2); // Bottom Right
|
|
|
|
// Bottom Face ----------------------------------------------------
|
|
rlVertex3f(x-width/2, y-height/2, z-length/2); // Top Left
|
|
rlVertex3f(x+width/2, y-height/2, z+length/2); // Bottom Right
|
|
rlVertex3f(x-width/2, y-height/2, z+length/2); // Bottom Left
|
|
|
|
rlVertex3f(x+width/2, y-height/2, z-length/2); // Top Right
|
|
rlVertex3f(x+width/2, y-height/2, z+length/2); // Bottom Right
|
|
rlVertex3f(x-width/2, y-height/2, z-length/2); // Top Left
|
|
|
|
// Right face -----------------------------------------------------
|
|
rlVertex3f(x+width/2, y-height/2, z-length/2); // Bottom Right
|
|
rlVertex3f(x+width/2, y+height/2, z-length/2); // Top Right
|
|
rlVertex3f(x+width/2, y+height/2, z+length/2); // Top Left
|
|
|
|
rlVertex3f(x+width/2, y-height/2, z+length/2); // Bottom Left
|
|
rlVertex3f(x+width/2, y-height/2, z-length/2); // Bottom Right
|
|
rlVertex3f(x+width/2, y+height/2, z+length/2); // Top Left
|
|
|
|
// Left Face ------------------------------------------------------
|
|
rlVertex3f(x-width/2, y-height/2, z-length/2); // Bottom Right
|
|
rlVertex3f(x-width/2, y+height/2, z+length/2); // Top Left
|
|
rlVertex3f(x-width/2, y+height/2, z-length/2); // Top Right
|
|
|
|
rlVertex3f(x-width/2, y-height/2, z+length/2); // Bottom Left
|
|
rlVertex3f(x-width/2, y+height/2, z+length/2); // Top Left
|
|
rlVertex3f(x-width/2, y-height/2, z-length/2); // Bottom Right
|
|
rlEnd();
|
|
rlPopMatrix();
|
|
}
|
|
|
|
// Draw cube wires
|
|
static void DrawCubeWires(Vector3 position, float width, float height, float length, Color color)
|
|
{
|
|
float x = 0.0f;
|
|
float y = 0.0f;
|
|
float z = 0.0f;
|
|
|
|
rlPushMatrix();
|
|
|
|
rlTranslatef(position.x, position.y, position.z);
|
|
//rlRotatef(45, 0, 1, 0);
|
|
|
|
rlBegin(RL_LINES);
|
|
rlColor4ub(color.r, color.g, color.b, color.a);
|
|
|
|
// Front Face -----------------------------------------------------
|
|
// Bottom Line
|
|
rlVertex3f(x-width/2, y-height/2, z+length/2); // Bottom Left
|
|
rlVertex3f(x+width/2, y-height/2, z+length/2); // Bottom Right
|
|
|
|
// Left Line
|
|
rlVertex3f(x+width/2, y-height/2, z+length/2); // Bottom Right
|
|
rlVertex3f(x+width/2, y+height/2, z+length/2); // Top Right
|
|
|
|
// Top Line
|
|
rlVertex3f(x+width/2, y+height/2, z+length/2); // Top Right
|
|
rlVertex3f(x-width/2, y+height/2, z+length/2); // Top Left
|
|
|
|
// Right Line
|
|
rlVertex3f(x-width/2, y+height/2, z+length/2); // Top Left
|
|
rlVertex3f(x-width/2, y-height/2, z+length/2); // Bottom Left
|
|
|
|
// Back Face ------------------------------------------------------
|
|
// Bottom Line
|
|
rlVertex3f(x-width/2, y-height/2, z-length/2); // Bottom Left
|
|
rlVertex3f(x+width/2, y-height/2, z-length/2); // Bottom Right
|
|
|
|
// Left Line
|
|
rlVertex3f(x+width/2, y-height/2, z-length/2); // Bottom Right
|
|
rlVertex3f(x+width/2, y+height/2, z-length/2); // Top Right
|
|
|
|
// Top Line
|
|
rlVertex3f(x+width/2, y+height/2, z-length/2); // Top Right
|
|
rlVertex3f(x-width/2, y+height/2, z-length/2); // Top Left
|
|
|
|
// Right Line
|
|
rlVertex3f(x-width/2, y+height/2, z-length/2); // Top Left
|
|
rlVertex3f(x-width/2, y-height/2, z-length/2); // Bottom Left
|
|
|
|
// Top Face -------------------------------------------------------
|
|
// Left Line
|
|
rlVertex3f(x-width/2, y+height/2, z+length/2); // Top Left Front
|
|
rlVertex3f(x-width/2, y+height/2, z-length/2); // Top Left Back
|
|
|
|
// Right Line
|
|
rlVertex3f(x+width/2, y+height/2, z+length/2); // Top Right Front
|
|
rlVertex3f(x+width/2, y+height/2, z-length/2); // Top Right Back
|
|
|
|
// Bottom Face ---------------------------------------------------
|
|
// Left Line
|
|
rlVertex3f(x-width/2, y-height/2, z+length/2); // Top Left Front
|
|
rlVertex3f(x-width/2, y-height/2, z-length/2); // Top Left Back
|
|
|
|
// Right Line
|
|
rlVertex3f(x+width/2, y-height/2, z+length/2); // Top Right Front
|
|
rlVertex3f(x+width/2, y-height/2, z-length/2); // Top Right Back
|
|
rlEnd();
|
|
rlPopMatrix();
|
|
}
|