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raylib-src
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								/*******************************************************************************************

								*

								*   raylib [shaders] example - Apply a postprocessing shader and connect a custom uniform variable

								*

								*   NOTE: This example requires raylib OpenGL 3.3 or ES2 versions for shaders support,

								*         OpenGL 1.1 does not support shaders, recompile raylib to OpenGL 3.3 version.

								*

								*   NOTE: Shaders used in this example are #version 330 (OpenGL 3.3), to test this example

								*         on OpenGL ES 2.0 platforms (Android, Raspberry Pi, HTML5), use #version 100 shaders

								*         raylib comes with shaders ready for both versions, check raylib/shaders install folder

								*

								*   Example originally created with raylib 1.3, last time updated with raylib 4.0

								*

								*   Example 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) 2015-2023 Ramon Santamaria (@raysan5)

								*

								********************************************************************************************/


								#include "raylib.h"


								#if defined(PLATFORM_DESKTOP)

								    #define GLSL_VERSION            330

								#else   // PLATFORM_ANDROID, PLATFORM_WEB

								    #define GLSL_VERSION            100

								#endif


								//------------------------------------------------------------------------------------

								// Program main entry point

								//------------------------------------------------------------------------------------

								int main(void)

								{

								    // Initialization

								    //--------------------------------------------------------------------------------------

								    const int screenWidth = 800;

								    const int screenHeight = 450;


								    SetConfigFlags(FLAG_MSAA_4X_HINT);      // Enable Multi Sampling Anti Aliasing 4x (if available)


								    InitWindow(screenWidth, screenHeight, "raylib [shaders] example - custom uniform variable");


								    // Define the camera to look into our 3d world

								    Camera camera = { 0 };

								    camera.position = (Vector3){ 8.0f, 8.0f, 8.0f };    // Camera position

								    camera.target = (Vector3){ 0.0f, 1.5f, 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

								    camera.projection = CAMERA_PERSPECTIVE;             // Camera projection type


								    Model model = LoadModel("resources/models/barracks.obj");                   // Load OBJ model

								    Texture2D texture = LoadTexture("resources/models/barracks_diffuse.png");   // Load model texture (diffuse map)

								    model.materials[0].maps[MATERIAL_MAP_DIFFUSE].texture = texture;                     // Set model diffuse texture


								    Vector3 position = { 0.0f, 0.0f, 0.0f };                                    // Set model position


								    // Load postprocessing shader

								    // NOTE: Defining 0 (NULL) for vertex shader forces usage of internal default vertex shader

								    Shader shader = LoadShader(0, TextFormat("resources/shaders/glsl%i/swirl.fs", GLSL_VERSION));


								    // Get variable (uniform) location on the shader to connect with the program

								    // NOTE: If uniform variable could not be found in the shader, function returns -1

								    int swirlCenterLoc = GetShaderLocation(shader, "center");


								    float swirlCenter[2] = { (float)screenWidth/2, (float)screenHeight/2 };


								    // Create a RenderTexture2D to be used for render to texture

								    RenderTexture2D target = LoadRenderTexture(screenWidth, screenHeight);


								    SetTargetFPS(60);                   // Set our game to run at 60 frames-per-second

								    //--------------------------------------------------------------------------------------


								    // Main game loop

								    while (!WindowShouldClose())        // Detect window close button or ESC key

								    {

								        // Update

								        //----------------------------------------------------------------------------------

								        UpdateCamera(&camera, CAMERA_ORBITAL);


								        Vector2 mousePosition = GetMousePosition();


								        swirlCenter[0] = mousePosition.x;

								        swirlCenter[1] = screenHeight - mousePosition.y;


								        // Send new value to the shader to be used on drawing

								        SetShaderValue(shader, swirlCenterLoc, swirlCenter, SHADER_UNIFORM_VEC2);

								        //----------------------------------------------------------------------------------


								        // Draw

								        //----------------------------------------------------------------------------------

								        BeginTextureMode(target);       // Enable drawing to texture

								            ClearBackground(RAYWHITE);  // Clear texture background


								            BeginMode3D(camera);        // Begin 3d mode drawing

								                DrawModel(model, position, 0.5f, WHITE);   // Draw 3d model with texture

								                DrawGrid(10, 1.0f);     // Draw a grid

								            EndMode3D();                // End 3d mode drawing, returns to orthographic 2d mode


								            DrawText("TEXT DRAWN IN RENDER TEXTURE", 200, 10, 30, RED);

								        EndTextureMode();               // End drawing to texture (now we have a texture available for next passes)


								        BeginDrawing();

								            ClearBackground(RAYWHITE);  // Clear screen background


								            // Enable shader using the custom uniform

								            BeginShaderMode(shader);

								                // NOTE: Render texture must be y-flipped due to default OpenGL coordinates (left-bottom)

								                DrawTextureRec(target.texture, (Rectangle){ 0, 0, (float)target.texture.width, (float)-target.texture.height }, (Vector2){ 0, 0 }, WHITE);

								            EndShaderMode();


								            // Draw some 2d text over drawn texture

								            DrawText("(c) Barracks 3D model by Alberto Cano", screenWidth - 220, screenHeight - 20, 10, GRAY);

								            DrawFPS(10, 10);

								        EndDrawing();

								        //----------------------------------------------------------------------------------

								    }


								    // De-Initialization

								    //--------------------------------------------------------------------------------------

								    UnloadShader(shader);               // Unload shader

								    UnloadTexture(texture);             // Unload texture

								    UnloadModel(model);                 // Unload model

								    UnloadRenderTexture(target);        // Unload render texture


								    CloseWindow();                      // Close window and OpenGL context

								    //--------------------------------------------------------------------------------------


								    return 0;

								}