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

								*

								*   raylib [shaders] example - fog

								*

								*   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).

								*

								*   Example originally created with raylib 2.5, last time updated with raylib 3.7

								*

								*   Example contributed by Chris Camacho (@chriscamacho) and reviewed by Ramon Santamaria (@raysan5)

								*

								*   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) 2019-2024 Chris Camacho (@chriscamacho) and Ramon Santamaria (@raysan5)

								*

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


								#include "raylib.h"


								#include "raymath.h"


								#define RLIGHTS_IMPLEMENTATION

								#include "rlights.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 - fog");


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

								    Camera camera = { 0 };

								    camera.position = (Vector3){ 2.0f, 2.0f, 6.0f };    // Camera position

								    camera.target = (Vector3){ 0.0f, 0.5f, 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


								    // Load models and texture

								    Model modelA = LoadModelFromMesh(GenMeshTorus(0.4f, 1.0f, 16, 32));

								    Model modelB = LoadModelFromMesh(GenMeshCube(1.0f, 1.0f, 1.0f));

								    Model modelC = LoadModelFromMesh(GenMeshSphere(0.5f, 32, 32));

								    Texture texture = LoadTexture("resources/texel_checker.png");


								    // Assign texture to default model material

								    modelA.materials[0].maps[MATERIAL_MAP_DIFFUSE].texture = texture;

								    modelB.materials[0].maps[MATERIAL_MAP_DIFFUSE].texture = texture;

								    modelC.materials[0].maps[MATERIAL_MAP_DIFFUSE].texture = texture;


								    // Load shader and set up some uniforms

								    Shader shader = LoadShader(TextFormat("resources/shaders/glsl%i/lighting.vs", GLSL_VERSION),

								                               TextFormat("resources/shaders/glsl%i/fog.fs", GLSL_VERSION));

								    shader.locs[SHADER_LOC_MATRIX_MODEL] = GetShaderLocation(shader, "matModel");

								    shader.locs[SHADER_LOC_VECTOR_VIEW] = GetShaderLocation(shader, "viewPos");


								    // Ambient light level

								    int ambientLoc = GetShaderLocation(shader, "ambient");

								    SetShaderValue(shader, ambientLoc, (float[4]){ 0.2f, 0.2f, 0.2f, 1.0f }, SHADER_UNIFORM_VEC4);


								    float fogDensity = 0.15f;

								    int fogDensityLoc = GetShaderLocation(shader, "fogDensity");

								    SetShaderValue(shader, fogDensityLoc, &fogDensity, SHADER_UNIFORM_FLOAT);


								    // NOTE: All models share the same shader

								    modelA.materials[0].shader = shader;

								    modelB.materials[0].shader = shader;

								    modelC.materials[0].shader = shader;


								    // Using just 1 point lights

								    CreateLight(LIGHT_POINT, (Vector3){ 0, 2, 6 }, Vector3Zero(), WHITE, shader);


								    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);


								        if (IsKeyDown(KEY_UP))

								        {

								            fogDensity += 0.001f;

								            if (fogDensity > 1.0f) fogDensity = 1.0f;

								        }


								        if (IsKeyDown(KEY_DOWN))

								        {

								            fogDensity -= 0.001f;

								            if (fogDensity < 0.0f) fogDensity = 0.0f;

								        }


								        SetShaderValue(shader, fogDensityLoc, &fogDensity, SHADER_UNIFORM_FLOAT);


								        // Rotate the torus

								        modelA.transform = MatrixMultiply(modelA.transform, MatrixRotateX(-0.025f));

								        modelA.transform = MatrixMultiply(modelA.transform, MatrixRotateZ(0.012f));


								        // Update the light shader with the camera view position

								        SetShaderValue(shader, shader.locs[SHADER_LOC_VECTOR_VIEW], &camera.position.x, SHADER_UNIFORM_VEC3);

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


								        // Draw

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

								        BeginDrawing();


								            ClearBackground(GRAY);


								            BeginMode3D(camera);


								                // Draw the three models

								                DrawModel(modelA, Vector3Zero(), 1.0f, WHITE);

								                DrawModel(modelB, (Vector3){ -2.6f, 0, 0 }, 1.0f, WHITE);

								                DrawModel(modelC, (Vector3){ 2.6f, 0, 0 }, 1.0f, WHITE);


								                for (int i = -20; i < 20; i += 2) DrawModel(modelA,(Vector3){ (float)i, 0, 2 }, 1.0f, WHITE);


								            EndMode3D();


								            DrawText(TextFormat("Use KEY_UP/KEY_DOWN to change fog density [%.2f]", fogDensity), 10, 10, 20, RAYWHITE);


								        EndDrawing();

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

								    }


								    // De-Initialization

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

								    UnloadModel(modelA);        // Unload the model A

								    UnloadModel(modelB);        // Unload the model B

								    UnloadModel(modelC);        // Unload the model C

								    UnloadTexture(texture);     // Unload the texture

								    UnloadShader(shader);       // Unload shader


								    CloseWindow();              // Close window and OpenGL context

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


								    return 0;

								}