REMOVED: EXAMPLE: models_material_pbr

hace 3 años · 9a568654be
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@ -73,7 +73,6 @@ if (${PLATFORM} MATCHES "Android")
    list(REMOVE_ITEM example_sources ${CMAKE_CURRENT_SOURCE_DIR}/core/core_world_screen.c)
    
    list(REMOVE_ITEM example_sources ${CMAKE_CURRENT_SOURCE_DIR}/models/models_mesh_picking.c)
    list(REMOVE_ITEM example_sources ${CMAKE_CURRENT_SOURCE_DIR}/models/models_material_pbr.c)
    list(REMOVE_ITEM example_sources ${CMAKE_CURRENT_SOURCE_DIR}/models/models_cubicmap.c)
    list(REMOVE_ITEM example_sources ${CMAKE_CURRENT_SOURCE_DIR}/models/models_skybox.c)
    list(REMOVE_ITEM example_sources ${CMAKE_CURRENT_SOURCE_DIR}/models/models_mesh_picking.c)
--- a/examples/Makefile
+++ b/examples/Makefile
@ -462,7 +462,6 @@ MODELS = \
    models/models_cubicmap \
    models/models_first_person_maze \
    models/models_geometric_shapes \
    models/models_material_pbr \
    models/models_mesh_generation \
    models/models_mesh_picking \
    models/models_loading \
@ -471,8 +470,7 @@ MODELS = \
    models/models_skybox \
    models/models_yaw_pitch_roll \
    models/models_heightmap \
    models/models_waving_cubes \
 	models/models_magicavoxel_loading
    models/models_waving_cubes

 SHADERS = \
    shaders/shaders_model_shader \
--- a/examples/README.md
+++ b/examples/README.md
@ -110,7 +110,7 @@ Examples using raylib models functionality, including models loading/generation
 | 72 | [models_cubicmap](models/models_cubicmap.c)                               | <img src="models/models_cubicmap.png" alt="models_cubicmap" width="200">                               | ray                                              |        |
 | 73 | [models_first_person_maze](models/models_first_person_maze.c)             | <img src="models/models_first_person_maze.png" alt="models_first_person_maze" width="200">             | ray                                              |        |
 | 74 | [models_geometric_shapes](models/models_geometric_shapes.c)               | <img src="models/models_geometric_shapes.png" alt="models_geometric_shapes" width="200">               | ray                                              |        |
 | 75 | [models_material_pbr](models/models_material_pbr.c)                       | <img src="models/models_material_pbr.png" alt="models_material_pbr" width="200">                       | ray                                              |        |
 | 75 | [...]()                       |                        | ray                                              |        |
 | 76 | [models_mesh_generation](models/models_mesh_generation.c)                 | <img src="models/models_mesh_generation.png" alt="models_mesh_generation" width="200">                 | ray                                              |        |
 | 77 | [models_mesh_picking](models/models_mesh_picking.c)                       | <img src="models/models_mesh_picking.png" alt="models_mesh_picking" width="200">                       | [Joel Davis](https://github.com/joeld42)         |        |
 | 78 | [models_loading](models/models_loading.c)                                 | <img src="models/models_loading.png" alt="models_loading" width="200">                                 | ray                                              |        |
--- a/examples/models/models_material_pbr.c
+++ b/examples/models/models_material_pbr.c
@ -1,543 +0,0 @@
 /*******************************************************************************************
 *
 *   raylib [models] example - PBR material
 *
 *   NOTE: This example requires raylib OpenGL 3.3 for shaders support and only #version 330
 *         is currently supported. OpenGL ES 2.0 platforms are not supported at the moment.
 *
 *   This example has been created using raylib 1.8 (www.raylib.com)
 *   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
 *
 *   Copyright (c) 2017 Ramon Santamaria (@raysan5)
 *
 ********************************************************************************************/

 #include "raylib.h"
 #include "raymath.h"
 #include "rlgl.h"

 #include <stdio.h>

 #define RLIGHTS_IMPLEMENTATION
 #include "rlights.h"

 #if defined(PLATFORM_DESKTOP)
    #define GLSL_VERSION            330
 #else   // PLATFORM_RPI, PLATFORM_ANDROID, PLATFORM_WEB
    #define GLSL_VERSION            100
 #endif

 #define CUBEMAP_SIZE        1024        // Cubemap texture size
 #define IRRADIANCE_SIZE       32        // Irradiance texture size
 #define PREFILTERED_SIZE     256        // Prefiltered HDR environment texture size
 #define BRDF_SIZE            512        // BRDF LUT texture size
 #define LIGHT_DISTANCE      1000.0f
 #define LIGHT_HEIGHT           1.0f

 // PBR texture maps generation
 static TextureCubemap GenTextureCubemap(Shader shader, Texture2D panorama, int size, int format); // Generate cubemap (6 faces) from equirectangular (panorama) texture
 static TextureCubemap GenTextureIrradiance(Shader shader, TextureCubemap cubemap, int size);      // Generate irradiance cubemap using cubemap texture
 static TextureCubemap GenTexturePrefilter(Shader shader, TextureCubemap cubemap, int size);       // Generate prefilter cubemap using cubemap texture
 static Texture2D GenTextureBRDF(Shader shader, int size);              // Generate a generic BRDF texture

 // PBR material loading
 static Material LoadMaterialPBR(Color albedo, float metalness, float roughness);

 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 [models] example - pbr material");

    // Define the camera to look into our 3d world
    Camera camera = { 0 };
    camera.position = (Vector3){ 4.0f, 4.0f, 4.0f };    // 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 mode type

    // Load model and PBR material
    Model model = LoadModel("resources/pbr/trooper.obj");

    // Mesh tangents are generated... and uploaded to GPU
    // NOTE: New VBO for tangents is generated at default location and also binded to mesh VAO
    //MeshTangents(&model.meshes[0]);

    model.materials[0] = LoadMaterialPBR((Color){ 255, 255, 255, 255 }, 1.0f, 1.0f);

    // Create lights
    // NOTE: Lights are added to an internal lights pool automatically
    CreateLight(LIGHT_POINT, (Vector3){ LIGHT_DISTANCE, LIGHT_HEIGHT, 0.0f }, (Vector3){ 0.0f, 0.0f, 0.0f }, (Color){ 255, 0, 0, 255 }, model.materials[0].shader);
    CreateLight(LIGHT_POINT, (Vector3){ 0.0f, LIGHT_HEIGHT, LIGHT_DISTANCE }, (Vector3){ 0.0f, 0.0f, 0.0f }, (Color){ 0, 255, 0, 255 }, model.materials[0].shader);
    CreateLight(LIGHT_POINT, (Vector3){ -LIGHT_DISTANCE, LIGHT_HEIGHT, 0.0f }, (Vector3){ 0.0f, 0.0f, 0.0f }, (Color){ 0, 0, 255, 255 }, model.materials[0].shader);
    CreateLight(LIGHT_DIRECTIONAL, (Vector3){ 0.0f, LIGHT_HEIGHT*2.0f, -LIGHT_DISTANCE }, (Vector3){ 0.0f, 0.0f, 0.0f }, (Color){ 255, 0, 255, 255 }, model.materials[0].shader);

    SetCameraMode(camera, CAMERA_ORBITAL);  // Set an orbital camera mode

    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);              // Update camera

        // Send to material PBR shader camera view position
        float cameraPos[3] = { camera.position.x, camera.position.y, camera.position.z };
        SetShaderValue(model.materials[0].shader, model.materials[0].shader.locs[SHADER_LOC_VECTOR_VIEW], cameraPos, SHADER_UNIFORM_VEC3);
        //----------------------------------------------------------------------------------

        // Draw
        //----------------------------------------------------------------------------------
        BeginDrawing();

            ClearBackground(RAYWHITE);

            BeginMode3D(camera);

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

                DrawGrid(10, 1.0f);

            EndMode3D();

            DrawFPS(10, 10);

        EndDrawing();
        //----------------------------------------------------------------------------------
    }

    // De-Initialization
    //--------------------------------------------------------------------------------------
    UnloadMaterial(model.materials[0]); // Unload material: shader and textures

    UnloadModel(model);         // Unload model

    CloseWindow();              // Close window and OpenGL context
    //--------------------------------------------------------------------------------------

    return 0;
 }

 // Load PBR material (Supports: ALBEDO, NORMAL, METALNESS, ROUGHNESS, AO, EMMISIVE, HEIGHT maps)
 // NOTE: PBR shader is loaded inside this function
 static Material LoadMaterialPBR(Color albedo, float metalness, float roughness)
 {
    Material mat = LoadMaterialDefault();   // Initialize material to default

    // Load PBR shader (requires several maps)
    mat.shader = LoadShader(TextFormat("resources/shaders/glsl%i/pbr.vs", GLSL_VERSION),
                            TextFormat("resources/shaders/glsl%i/pbr.fs", GLSL_VERSION));

    // Get required locations points for PBR material
    // NOTE: Those location names must be available and used in the shader code
    mat.shader.locs[SHADER_LOC_MAP_ALBEDO] = GetShaderLocation(mat.shader, "albedo.sampler");
    mat.shader.locs[SHADER_LOC_MAP_METALNESS] = GetShaderLocation(mat.shader, "metalness.sampler");
    mat.shader.locs[SHADER_LOC_MAP_NORMAL] = GetShaderLocation(mat.shader, "normals.sampler");
    mat.shader.locs[SHADER_LOC_MAP_ROUGHNESS] = GetShaderLocation(mat.shader, "roughness.sampler");
    mat.shader.locs[SHADER_LOC_MAP_OCCLUSION] = GetShaderLocation(mat.shader, "occlusion.sampler");
    //mat.shader.locs[SHADER_LOC_MAP_EMISSION] = GetShaderLocation(mat.shader, "emission.sampler");
    //mat.shader.locs[SHADER_LOC_MAP_HEIGHT] = GetShaderLocation(mat.shader, "height.sampler");
    mat.shader.locs[SHADER_LOC_MAP_IRRADIANCE] = GetShaderLocation(mat.shader, "irradianceMap");
    mat.shader.locs[SHADER_LOC_MAP_PREFILTER] = GetShaderLocation(mat.shader, "prefilterMap");
    mat.shader.locs[SHADER_LOC_MAP_BRDF] = GetShaderLocation(mat.shader, "brdfLUT");

    // Set view matrix location
    mat.shader.locs[SHADER_LOC_MATRIX_MODEL] = GetShaderLocation(mat.shader, "matModel");
    //mat.shader.locs[SHADER_LOC_MATRIX_VIEW] = GetShaderLocation(mat.shader, "view");
    mat.shader.locs[SHADER_LOC_VECTOR_VIEW] = GetShaderLocation(mat.shader, "viewPos");

    // Set PBR standard maps
    mat.maps[MATERIAL_MAP_ALBEDO].texture = LoadTexture("resources/pbr/trooper_albedo.png");
    mat.maps[MATERIAL_MAP_NORMAL].texture = LoadTexture("resources/pbr/trooper_normals.png");
    mat.maps[MATERIAL_MAP_METALNESS].texture = LoadTexture("resources/pbr/trooper_metalness.png");
    mat.maps[MATERIAL_MAP_ROUGHNESS].texture = LoadTexture("resources/pbr/trooper_roughness.png");
    mat.maps[MATERIAL_MAP_OCCLUSION].texture = LoadTexture("resources/pbr/trooper_ao.png");

    // Set textures filtering for better quality
    SetTextureFilter(mat.maps[MATERIAL_MAP_ALBEDO].texture, TEXTURE_FILTER_BILINEAR);
    SetTextureFilter(mat.maps[MATERIAL_MAP_NORMAL].texture, TEXTURE_FILTER_BILINEAR);
    SetTextureFilter(mat.maps[MATERIAL_MAP_METALNESS].texture, TEXTURE_FILTER_BILINEAR);
    SetTextureFilter(mat.maps[MATERIAL_MAP_ROUGHNESS].texture, TEXTURE_FILTER_BILINEAR);
    SetTextureFilter(mat.maps[MATERIAL_MAP_OCCLUSION].texture, TEXTURE_FILTER_BILINEAR);

    // Enable sample usage in shader for assigned textures
    SetShaderValue(mat.shader, GetShaderLocation(mat.shader, "albedo.useSampler"), (int[1]){ 1 }, SHADER_UNIFORM_INT);
    SetShaderValue(mat.shader, GetShaderLocation(mat.shader, "normals.useSampler"), (int[1]){ 1 }, SHADER_UNIFORM_INT);
    SetShaderValue(mat.shader, GetShaderLocation(mat.shader, "metalness.useSampler"), (int[1]){ 1 }, SHADER_UNIFORM_INT);
    SetShaderValue(mat.shader, GetShaderLocation(mat.shader, "roughness.useSampler"), (int[1]){ 1 }, SHADER_UNIFORM_INT);
    SetShaderValue(mat.shader, GetShaderLocation(mat.shader, "occlusion.useSampler"), (int[1]){ 1 }, SHADER_UNIFORM_INT);

    int renderModeLoc = GetShaderLocation(mat.shader, "renderMode");
    SetShaderValue(mat.shader, renderModeLoc, (int[1]){ 0 }, SHADER_UNIFORM_INT);

    // Set up material properties color
    mat.maps[MATERIAL_MAP_ALBEDO].color = albedo;
    mat.maps[MATERIAL_MAP_NORMAL].color = (Color){ 128, 128, 255, 255 };
    mat.maps[MATERIAL_MAP_METALNESS].value = metalness;
    mat.maps[MATERIAL_MAP_ROUGHNESS].value = roughness;
    mat.maps[MATERIAL_MAP_OCCLUSION].value = 1.0f;
    mat.maps[MATERIAL_MAP_EMISSION].value = 0.5f;
    mat.maps[MATERIAL_MAP_HEIGHT].value = 0.5f;

    // Generate cubemap from panorama texture
    //--------------------------------------------------------------------------------------------------------
    Texture2D panorama = LoadTexture("resources/dresden_square_2k.hdr");

    // Load equirectangular to cubemap shader
    Shader shdrCubemap = LoadShader(TextFormat("resources/shaders/glsl%i/pbr.vs", GLSL_VERSION),
                                    TextFormat("resources/shaders/glsl%i/pbr.fs", GLSL_VERSION));

    SetShaderValue(shdrCubemap, GetShaderLocation(shdrCubemap, "equirectangularMap"), (int[1]){ 0 }, SHADER_UNIFORM_INT);
    TextureCubemap cubemap = GenTextureCubemap(shdrCubemap, panorama, CUBEMAP_SIZE, PIXELFORMAT_UNCOMPRESSED_R32G32B32);
    UnloadTexture(panorama);
    UnloadShader(shdrCubemap);
    //--------------------------------------------------------------------------------------------------------

    // Generate irradiance map from cubemap texture
    //--------------------------------------------------------------------------------------------------------
    // Load irradiance (GI) calculation shader
    Shader shdrIrradiance = LoadShader(TextFormat("resources/shaders/glsl%i/skybox.vs", GLSL_VERSION),
                                       TextFormat("resources/shaders/glsl%i/irradiance.fs", GLSL_VERSION));

    SetShaderValue(shdrIrradiance, GetShaderLocation(shdrIrradiance, "environmentMap"), (int[1]){ 0 }, SHADER_UNIFORM_INT);
    mat.maps[MATERIAL_MAP_IRRADIANCE].texture = GenTextureIrradiance(shdrIrradiance, cubemap, IRRADIANCE_SIZE);
    UnloadShader(shdrIrradiance);
    //--------------------------------------------------------------------------------------------------------

    // Generate prefilter map from cubemap texture
    //--------------------------------------------------------------------------------------------------------
    // Load reflection prefilter calculation shader
    Shader shdrPrefilter = LoadShader(TextFormat("resources/shaders/glsl%i/skybox.vs", GLSL_VERSION),
                                      TextFormat("resources/shaders/glsl%i/prefilter.fs", GLSL_VERSION));

    SetShaderValue(shdrPrefilter, GetShaderLocation(shdrPrefilter, "environmentMap"), (int[1]){ 0 }, SHADER_UNIFORM_INT);
    mat.maps[MATERIAL_MAP_PREFILTER].texture = GenTexturePrefilter(shdrPrefilter, cubemap, PREFILTERED_SIZE);
    UnloadTexture(cubemap);
    UnloadShader(shdrPrefilter);
    //--------------------------------------------------------------------------------------------------------

    // Generate BRDF (bidirectional reflectance distribution function) texture (using shader)
    //--------------------------------------------------------------------------------------------------------
    Shader shdrBRDF = LoadShader(TextFormat("resources/shaders/glsl%i/brdf.vs", GLSL_VERSION),
                                 TextFormat("resources/shaders/glsl%i/brdf.fs", GLSL_VERSION));

    mat.maps[MATERIAL_MAP_BRDF].texture = GenTextureBRDF(shdrBRDF, BRDF_SIZE);
    UnloadShader(shdrBRDF);
    //--------------------------------------------------------------------------------------------------------

    return mat;
 }

 // Texture maps generation (PBR)
 //-------------------------------------------------------------------------------------------
 // Generate cubemap texture from HDR texture
 static TextureCubemap GenTextureCubemap(Shader shader, Texture2D panorama, int size, int format)
 {
    TextureCubemap cubemap = { 0 };

    rlDisableBackfaceCulling();     // Disable backface culling to render inside the cube

    // STEP 1: Setup framebuffer
    //------------------------------------------------------------------------------------------
    unsigned int rbo = rlLoadTextureDepth(size, size, true);
    cubemap.id = rlLoadTextureCubemap(NULL, size, format);

    unsigned int fbo = rlLoadFramebuffer(size, size);
    rlFramebufferAttach(fbo, rbo, RL_ATTACHMENT_DEPTH, RL_ATTACHMENT_RENDERBUFFER, 0);
    rlFramebufferAttach(fbo, cubemap.id, RL_ATTACHMENT_COLOR_CHANNEL0, RL_ATTACHMENT_CUBEMAP_POSITIVE_X, 0);

    // Check if framebuffer is complete with attachments (valid)
    if (rlFramebufferComplete(fbo)) TraceLog(LOG_INFO, "FBO: [ID %i] Framebuffer object created successfully", fbo);
    //------------------------------------------------------------------------------------------

    // STEP 2: Draw to framebuffer
    //------------------------------------------------------------------------------------------
    // NOTE: Shader is used to convert HDR equirectangular environment map to cubemap equivalent (6 faces)
    rlEnableShader(shader.id);

    // Define projection matrix and send it to shader
    Matrix matFboProjection = MatrixPerspective(90.0*DEG2RAD, 1.0, RL_CULL_DISTANCE_NEAR, RL_CULL_DISTANCE_FAR);
    rlSetUniformMatrix(shader.locs[SHADER_LOC_MATRIX_PROJECTION], matFboProjection);

    // Define view matrix for every side of the cubemap
    Matrix fboViews[6] = {
        MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){  1.0f,  0.0f,  0.0f }, (Vector3){ 0.0f, -1.0f,  0.0f }),
        MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ -1.0f,  0.0f,  0.0f }, (Vector3){ 0.0f, -1.0f,  0.0f }),
        MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){  0.0f,  1.0f,  0.0f }, (Vector3){ 0.0f,  0.0f,  1.0f }),
        MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){  0.0f, -1.0f,  0.0f }, (Vector3){ 0.0f,  0.0f, -1.0f }),
        MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){  0.0f,  0.0f,  1.0f }, (Vector3){ 0.0f, -1.0f,  0.0f }),
        MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){  0.0f,  0.0f, -1.0f }, (Vector3){ 0.0f, -1.0f,  0.0f })
    };

    rlViewport(0, 0, size, size);   // Set viewport to current fbo dimensions

    // Activate and enable texture for drawing to cubemap faces
    rlActiveTextureSlot(0);
    rlEnableTexture(panorama.id);

    for (int i = 0; i < 6; i++)
    {
        // Set the view matrix for the current cube face
        rlSetUniformMatrix(shader.locs[SHADER_LOC_MATRIX_VIEW], fboViews[i]);
        
        // Select the current cubemap face attachment for the fbo
        // WARNING: This function by default enables->attach->disables fbo!!!
        rlFramebufferAttach(fbo, cubemap.id, RL_ATTACHMENT_COLOR_CHANNEL0, RL_ATTACHMENT_CUBEMAP_POSITIVE_X + i, 0);
        rlEnableFramebuffer(fbo);

        // Load and draw a cube, it uses the current enabled texture
        rlClearScreenBuffers();
        rlLoadDrawCube();
        
        // ALTERNATIVE: Try to use internal batch system to draw the cube instead of rlLoadDrawCube
        // for some reason this method does not work, maybe due to cube triangles definition? normals pointing out?
        // TODO: Investigate this issue...
        //rlSetTexture(panorama.id); // WARNING: It must be called after enabling current framebuffer if using internal batch system!
        //rlClearScreenBuffers();
        //DrawCubeV(Vector3Zero(), Vector3One(), WHITE);
        //rlDrawRenderBatchActive();
    }
    //------------------------------------------------------------------------------------------

    // STEP 3: Unload framebuffer and reset state
    //------------------------------------------------------------------------------------------
    rlDisableShader();          // Unbind shader
    rlDisableTexture();         // Unbind texture
    rlDisableFramebuffer();     // Unbind framebuffer
    rlUnloadFramebuffer(fbo);   // Unload framebuffer (and automatically attached depth texture/renderbuffer)

    // Reset viewport dimensions to default
    rlViewport(0, 0, rlGetFramebufferWidth(), rlGetFramebufferHeight());
    rlEnableBackfaceCulling();
    //------------------------------------------------------------------------------------------

    cubemap.width = size;
    cubemap.height = size;
    cubemap.mipmaps = 1;
    cubemap.format = PIXELFORMAT_UNCOMPRESSED_R32G32B32;

    return cubemap;
 }

 // Generate irradiance texture using cubemap data
 static TextureCubemap GenTextureIrradiance(Shader shader, TextureCubemap cubemap, int size)
 {
    TextureCubemap irradiance = { 0 };

    rlDisableBackfaceCulling();     // Disable backface culling to render inside the cube

    // STEP 1: Setup framebuffer
    //------------------------------------------------------------------------------------------
    unsigned int rbo = rlLoadTextureDepth(size, size, true);
    irradiance.id = rlLoadTextureCubemap(NULL, size, PIXELFORMAT_UNCOMPRESSED_R32G32B32);

    unsigned int fbo = rlLoadFramebuffer(size, size);
    rlFramebufferAttach(fbo, rbo, RL_ATTACHMENT_DEPTH, RL_ATTACHMENT_RENDERBUFFER, 0);
    rlFramebufferAttach(fbo, cubemap.id, RL_ATTACHMENT_COLOR_CHANNEL0, RL_ATTACHMENT_CUBEMAP_POSITIVE_X, 0);
    //------------------------------------------------------------------------------------------

    // STEP 2: Draw to framebuffer
    //------------------------------------------------------------------------------------------
    // NOTE: Shader is used to solve diffuse integral by convolution to create an irradiance cubemap
    rlEnableShader(shader.id);

    // Define projection matrix and send it to shader
    Matrix matFboProjection = MatrixPerspective(90.0*DEG2RAD, 1.0, RL_CULL_DISTANCE_NEAR, RL_CULL_DISTANCE_FAR);
    rlSetUniformMatrix(shader.locs[SHADER_LOC_MATRIX_PROJECTION], matFboProjection);

    // Define view matrix for every side of the cubemap
    Matrix fboViews[6] = {
        MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){  1.0f,  0.0f,  0.0f }, (Vector3){ 0.0f, -1.0f,  0.0f }),
        MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ -1.0f,  0.0f,  0.0f }, (Vector3){ 0.0f, -1.0f,  0.0f }),
        MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){  0.0f,  1.0f,  0.0f }, (Vector3){ 0.0f,  0.0f,  1.0f }),
        MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){  0.0f, -1.0f,  0.0f }, (Vector3){ 0.0f,  0.0f, -1.0f }),
        MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){  0.0f,  0.0f,  1.0f }, (Vector3){ 0.0f, -1.0f,  0.0f }),
        MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){  0.0f,  0.0f, -1.0f }, (Vector3){ 0.0f, -1.0f,  0.0f })
    };

    rlActiveTextureSlot(0);
    rlEnableTextureCubemap(cubemap.id);

    rlViewport(0, 0, size, size);   // Set viewport to current fbo dimensions

    for (int i = 0; i < 6; i++)
    {
        rlSetUniformMatrix(shader.locs[SHADER_LOC_MATRIX_VIEW], fboViews[i]);
        rlFramebufferAttach(fbo, irradiance.id, RL_ATTACHMENT_COLOR_CHANNEL0, RL_ATTACHMENT_CUBEMAP_POSITIVE_X + i, 0);

        rlEnableFramebuffer(fbo);
        rlClearScreenBuffers();
        rlLoadDrawCube();
    }
    //------------------------------------------------------------------------------------------

    // STEP 3: Unload framebuffer and reset state
    //------------------------------------------------------------------------------------------
    rlDisableShader();          // Unbind shader
    rlDisableTexture();         // Unbind texture
    rlDisableFramebuffer();     // Unbind framebuffer
    rlUnloadFramebuffer(fbo);   // Unload framebuffer (and automatically attached depth texture/renderbuffer)

    // Reset viewport dimensions to default
    rlViewport(0, 0, rlGetFramebufferWidth(), rlGetFramebufferHeight());
    rlEnableBackfaceCulling();
    //------------------------------------------------------------------------------------------

    irradiance.width = size;
    irradiance.height = size;
    irradiance.mipmaps = 1;
    irradiance.format = PIXELFORMAT_UNCOMPRESSED_R32G32B32;

    return irradiance;
 }

 // Generate prefilter texture using cubemap data
 static TextureCubemap GenTexturePrefilter(Shader shader, TextureCubemap cubemap, int size)
 {
    TextureCubemap prefilter = { 0 };

    rlDisableBackfaceCulling();     // Disable backface culling to render inside the cube

    // STEP 1: Setup framebuffer
    //------------------------------------------------------------------------------------------
    unsigned int rbo = rlLoadTextureDepth(size, size, true);
    prefilter.id = rlLoadTextureCubemap(NULL, size, PIXELFORMAT_UNCOMPRESSED_R32G32B32);
    rlTextureParameters(prefilter.id, RL_TEXTURE_MIN_FILTER, RL_TEXTURE_FILTER_MIP_LINEAR);

    unsigned int fbo = rlLoadFramebuffer(size, size);
    rlFramebufferAttach(fbo, rbo, RL_ATTACHMENT_DEPTH, RL_ATTACHMENT_RENDERBUFFER, 0);
    rlFramebufferAttach(fbo, cubemap.id, RL_ATTACHMENT_COLOR_CHANNEL0, RL_ATTACHMENT_CUBEMAP_POSITIVE_X, 0);
    //------------------------------------------------------------------------------------------

    // Generate mipmaps for the prefiltered HDR texture
    //glGenerateMipmap(GL_TEXTURE_CUBE_MAP);    // TODO!

    // STEP 2: Draw to framebuffer
    //------------------------------------------------------------------------------------------
    // NOTE: Shader is used to prefilter HDR and store data into mipmap levels

    // Define projection matrix and send it to shader
    Matrix fboProjection = MatrixPerspective(90.0*DEG2RAD, 1.0, RL_CULL_DISTANCE_NEAR, RL_CULL_DISTANCE_FAR);
    rlEnableShader(shader.id);
    rlSetUniformMatrix(shader.locs[SHADER_LOC_MATRIX_PROJECTION], fboProjection);

    // Define view matrix for every side of the cubemap
    Matrix fboViews[6] = {
        MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){  1.0f,  0.0f,  0.0f }, (Vector3){ 0.0f, -1.0f,  0.0f }),
        MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ -1.0f,  0.0f,  0.0f }, (Vector3){ 0.0f, -1.0f,  0.0f }),
        MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){  0.0f,  1.0f,  0.0f }, (Vector3){ 0.0f,  0.0f,  1.0f }),
        MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){  0.0f, -1.0f,  0.0f }, (Vector3){ 0.0f,  0.0f, -1.0f }),
        MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){  0.0f,  0.0f,  1.0f }, (Vector3){ 0.0f, -1.0f,  0.0f }),
        MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){  0.0f,  0.0f, -1.0f }, (Vector3){ 0.0f, -1.0f,  0.0f })
    };

    rlActiveTextureSlot(0);
    rlEnableTextureCubemap(cubemap.id);

    // TODO: Locations should be taken out of this function... too shader dependant...
    int roughnessLoc = rlGetLocationUniform(shader.id, "roughness");

    rlEnableFramebuffer(fbo);

    #define MAX_MIPMAP_LEVELS   5   // Max number of prefilter texture mipmaps

    for (int mip = 0; mip < MAX_MIPMAP_LEVELS; mip++)
    {
        // Resize framebuffer according to mip-level size.
        unsigned int mipWidth  = size*(int)powf(0.5f, (float)mip);
        unsigned int mipHeight = size*(int)powf(0.5f, (float)mip);

        rlViewport(0, 0, mipWidth, mipHeight);

        //glBindRenderbuffer(GL_RENDERBUFFER, rbo);
        //glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, mipWidth, mipHeight);

        float roughness = (float)mip/(float)(MAX_MIPMAP_LEVELS - 1);
        rlSetUniform(roughnessLoc, &roughness, SHADER_UNIFORM_FLOAT, 1);

        for (int i = 0; i < 6; i++)
        {
            rlSetUniformMatrix(shader.locs[SHADER_LOC_MATRIX_VIEW], fboViews[i]);
            rlFramebufferAttach(fbo, prefilter.id, RL_ATTACHMENT_COLOR_CHANNEL0, RL_ATTACHMENT_CUBEMAP_POSITIVE_X + i, mip);

            rlClearScreenBuffers();
            rlLoadDrawCube();
        }
    }
    //------------------------------------------------------------------------------------------

    // STEP 3: Unload framebuffer and reset state
    //------------------------------------------------------------------------------------------
    rlDisableShader();          // Unbind shader
    rlDisableTexture();         // Unbind texture
    rlDisableFramebuffer();     // Unbind framebuffer
    rlUnloadFramebuffer(fbo);   // Unload framebuffer (and automatically attached depth texture/renderbuffer)

    // Reset viewport dimensions to default
    rlViewport(0, 0, rlGetFramebufferWidth(), rlGetFramebufferHeight());
    rlEnableBackfaceCulling();
    //------------------------------------------------------------------------------------------

    prefilter.width = size;
    prefilter.height = size;
    prefilter.mipmaps = MAX_MIPMAP_LEVELS;
    prefilter.format = PIXELFORMAT_UNCOMPRESSED_R32G32B32;

    return prefilter;
 }

 // Generate BRDF texture using cubemap data
 // TODO: Review implementation: https://github.com/HectorMF/BRDFGenerator
 static Texture2D GenTextureBRDF(Shader shader, int size)
 {
    Texture2D brdf = { 0 };

    // STEP 1: Setup framebuffer
    //------------------------------------------------------------------------------------------
    unsigned int rbo = rlLoadTextureDepth(size, size, true);
    brdf.id = rlLoadTexture(NULL, size, size, PIXELFORMAT_UNCOMPRESSED_R32G32B32, 1);

    unsigned int fbo = rlLoadFramebuffer(size, size);
    rlFramebufferAttach(fbo, rbo, RL_ATTACHMENT_DEPTH, RL_ATTACHMENT_RENDERBUFFER, 0);
    rlFramebufferAttach(fbo, brdf.id, RL_ATTACHMENT_COLOR_CHANNEL0, RL_ATTACHMENT_TEXTURE2D, 0);
    //------------------------------------------------------------------------------------------

    // STEP 2: Draw to framebuffer
    //------------------------------------------------------------------------------------------
    // NOTE: Render BRDF LUT into a quad using FBO
    rlEnableShader(shader.id);

    rlViewport(0, 0, size, size);

    rlEnableFramebuffer(fbo);
    rlClearScreenBuffers();

    rlLoadDrawQuad();
    //------------------------------------------------------------------------------------------

    // STEP 3: Unload framebuffer and reset state
    //------------------------------------------------------------------------------------------
    rlDisableShader();          // Unbind shader
    rlDisableTexture();         // Unbind texture
    rlDisableFramebuffer();     // Unbind framebuffer
    rlUnloadFramebuffer(fbo);   // Unload framebuffer (and automatically attached depth texture/renderbuffer)

    // Reset viewport dimensions to default
    rlViewport(0, 0, rlGetFramebufferWidth(), rlGetFramebufferHeight());
    //------------------------------------------------------------------------------------------

    brdf.width = size;
    brdf.height = size;
    brdf.mipmaps = 1;
    brdf.format = PIXELFORMAT_UNCOMPRESSED_R32G32B32;

    return brdf;
 }
--- a/examples/models/models_material_pbr.png
+++ b/examples/models/models_material_pbr.png
--- a/examples/models/resources/pbr/trooper.obj
+++ b/examples/models/resources/pbr/trooper.obj
--- a/examples/models/resources/pbr/trooper_albedo.png
+++ b/examples/models/resources/pbr/trooper_albedo.png
--- a/examples/models/resources/pbr/trooper_ao.png
+++ b/examples/models/resources/pbr/trooper_ao.png
--- a/examples/models/resources/pbr/trooper_metalness.png
+++ b/examples/models/resources/pbr/trooper_metalness.png
--- a/examples/models/resources/pbr/trooper_normals.png
+++ b/examples/models/resources/pbr/trooper_normals.png
--- a/examples/models/resources/pbr/trooper_roughness.png
+++ b/examples/models/resources/pbr/trooper_roughness.png
--- a/examples/models/resources/shaders/glsl330/brdf.fs
+++ b/examples/models/resources/shaders/glsl330/brdf.fs
@ -1,124 +0,0 @@
 #version 330

 // Input vertex attributes (from vertex shader)
 in vec2 fragTexCoord;

 // Constant values
 const float PI = 3.14159265359;
 const uint MAX_SAMPLES = 1024u;

 // Output fragment color
 out vec4 finalColor;

 vec2 Hammersley(uint i, uint N);
 float RadicalInverseVdC(uint bits);
 float GeometrySchlickGGX(float NdotV, float roughness);
 float GeometrySmith(vec3 N, vec3 V, vec3 L, float roughness);
 vec3 ImportanceSampleGGX(vec2 Xi, vec3 N, float roughness);
 vec2 IntegrateBRDF(float NdotV, float roughness);

 float RadicalInverseVdC(uint bits)
 {
    bits = (bits << 16u) | (bits >> 16u);
    bits = ((bits & 0x55555555u) << 1u) | ((bits & 0xAAAAAAAAu) >> 1u);
    bits = ((bits & 0x33333333u) << 2u) | ((bits & 0xCCCCCCCCu) >> 2u);
    bits = ((bits & 0x0F0F0F0Fu) << 4u) | ((bits & 0xF0F0F0F0u) >> 4u);
    bits = ((bits & 0x00FF00FFu) << 8u) | ((bits & 0xFF00FF00u) >> 8u);
    return float(bits) * 2.3283064365386963e-10; // / 0x100000000
 }

 // Compute Hammersley coordinates
 vec2 Hammersley(uint i, uint N)
 {
    return vec2(float(i)/float(N), RadicalInverseVdC(i));
 }

 // Integrate number of importance samples for (roughness and NoV)
 vec3 ImportanceSampleGGX(vec2 Xi, vec3 N, float roughness)
 {
    float a = roughness*roughness;
    float phi = 2.0 * PI * Xi.x;
    float cosTheta = sqrt((1.0 - Xi.y)/(1.0 + (a*a - 1.0)*Xi.y));
    float sinTheta = sqrt(1.0 - cosTheta*cosTheta);

    // Transform from spherical coordinates to cartesian coordinates (halfway vector)
    vec3 H = vec3(cos(phi)*sinTheta, sin(phi)*sinTheta, cosTheta);

    // Transform from tangent space H vector to world space sample vector
    vec3 up = ((abs(N.z) < 0.999) ? vec3(0.0, 0.0, 1.0) : vec3(1.0, 0.0, 0.0));
    vec3 tangent = normalize(cross(up, N));
    vec3 bitangent = cross(N, tangent);
    vec3 sampleVec = tangent*H.x + bitangent*H.y + N*H.z;

    return normalize(sampleVec);
 }

 float GeometrySchlickGGX(float NdotV, float roughness)
 {
    // For IBL k is calculated different
    float k = (roughness*roughness)/2.0;

    float nom = NdotV;
    float denom = NdotV*(1.0 - k) + k;

    return nom/denom;
 }

 // Compute the geometry term for the BRDF given roughness squared, NoV, NoL
 float GeometrySmith(vec3 N, vec3 V, vec3 L, float roughness)
 {
    float NdotV = max(dot(N, V), 0.0);
    float NdotL = max(dot(N, L), 0.0);
    float ggx2 = GeometrySchlickGGX(NdotV, roughness);
    float ggx1 = GeometrySchlickGGX(NdotL, roughness);

    return ggx1*ggx2;
 }

 // Bidirectional reflectance distribution function
 // Ref: https://github.com/HectorMF/BRDFGenerator
 vec2 IntegrateBRDF(float NdotV, float roughness)
 {
    float A = 0.0;
    float B = 0.0;
    vec3 V = vec3(sqrt(1.0 - NdotV*NdotV), 0.0, NdotV);
    vec3 N = vec3(0.0, 0.0, 1.0);

    for (uint i = 0u; i < MAX_SAMPLES; i++)
    {
        // Generate a sample vector that's biased towards the preferred alignment direction (importance sampling)
        
        vec2 Xi = Hammersley(i, MAX_SAMPLES);       // Compute a Hammersely coordinate
        vec3 H = ImportanceSampleGGX(Xi, N, roughness); // Integrate number of importance samples for (roughness and NoV)
        vec3 L = normalize(2.0*dot(V, H)*H - V);    // Compute reflection vector L
        
        float NdotL = max(L.z, 0.0);                // Compute normal dot light
        float NdotH = max(H.z, 0.0);                // Compute normal dot half
        float VdotH = max(dot(V, H), 0.0);          // Compute view dot half

        if (NdotL > 0.0)
        {
            float G = GeometrySmith(N, V, L, roughness);    // Compute the geometry term for the BRDF given roughness squared, NoV, NoL
            float GVis = (G*VdotH)/(NdotH*NdotV);   // Compute the visibility term given G, VoH, NoH, NoV, NoL
            float Fc = pow(1.0 - VdotH, 5.0);       // Compute the fresnel term given VoH

            A += (1.0 - Fc)*GVis;                   // Sum the result given fresnel, geometry, visibility
            B += Fc*GVis;
        }
    }

    // Calculate brdf average sample
    A /= float(MAX_SAMPLES);
    B /= float(MAX_SAMPLES);

    return vec2(A, B);
 }

 void main()
 {
    // Calculate brdf based on texture coordinates
    vec2 brdf = IntegrateBRDF(fragTexCoord.x, fragTexCoord.y);

    // Calculate final fragment color
    finalColor = vec4(brdf.r, brdf.g, 0.0, 1.0);
 }
--- a/examples/models/resources/shaders/glsl330/brdf.vs
+++ b/examples/models/resources/shaders/glsl330/brdf.vs
@ -1,17 +0,0 @@
 #version 330

 // Input vertex attributes
 in vec3 vertexPosition;
 in vec2 vertexTexCoord;

 // Output vertex attributes (to fragment shader)
 out vec2 fragTexCoord;

 void main()
 {
    // Calculate fragment position based on model transformations
    fragTexCoord = vertexTexCoord;

    // Calculate final vertex position
    gl_Position = vec4(vertexPosition, 1.0);
 }
--- a/examples/models/resources/shaders/glsl330/irradiance.fs
+++ b/examples/models/resources/shaders/glsl330/irradiance.fs
@ -1,50 +0,0 @@
 #version 330

 // Input vertex attributes (from vertex shader)
 in vec3 fragPosition;

 // Input uniform values
 uniform samplerCube environmentMap;

 // Constant values
 const float PI = 3.14159265359;

 // Output fragment color
 out vec4 finalColor;

 void main()
 {
    // The sample direction equals the hemisphere's orientation
    vec3 normal = normalize(fragPosition);

    vec3 irradiance = vec3(0.0);  

    vec3 up = vec3(0.0, 1.0, 0.0);
    vec3 right = cross(up, normal);
    up = cross(normal, right);

    float sampleDelta = 0.025;
    float nrSamples = 0.0; 

    for (float phi = 0.0; phi < 2.0*PI; phi += sampleDelta)
    {
        for (float theta = 0.0; theta < 0.5*PI; theta += sampleDelta)
        {
            // Spherical to cartesian (in tangent space)
            vec3 tangentSample = vec3(sin(theta)*cos(phi), sin(theta)*sin(phi), cos(theta));
            
            // tangent space to world
            vec3 sampleVec = tangentSample.x*right + tangentSample.y*up + tangentSample.z*normal; 

            // Fetch color from environment cubemap
            irradiance += texture(environmentMap, sampleVec).rgb*cos(theta)*sin(theta);
            nrSamples++;
        }
    }

    // Calculate irradiance average value from samples
    irradiance = PI*irradiance*(1.0/float(nrSamples));

    // Calculate final fragment color
    finalColor = vec4(irradiance, 1.0);
 }
--- a/examples/models/resources/shaders/glsl330/pbr.fs
+++ b/examples/models/resources/shaders/glsl330/pbr.fs
@ -1,292 +0,0 @@
 #version 330

 #define     MAX_REFLECTION_LOD      4.0
 #define     MAX_DEPTH_LAYER         20
 #define     MIN_DEPTH_LAYER         10

 #define     MAX_LIGHTS              4
 #define     LIGHT_DIRECTIONAL       0
 #define     LIGHT_POINT             1

 struct MaterialProperty {
    vec3 color;
    int useSampler;
    sampler2D sampler;
 };

 struct Light {
    int enabled;
    int type;
    vec3 position;
    vec3 target;
    vec4 color;
 };

 // Input vertex attributes (from vertex shader)
 in vec3 fragPosition;
 in vec2 fragTexCoord;
 in vec3 fragNormal;
 in vec3 fragTangent;
 in vec3 fragBinormal;

 // Input material values
 uniform MaterialProperty albedo;
 uniform MaterialProperty normals;
 uniform MaterialProperty metalness;
 uniform MaterialProperty roughness;
 uniform MaterialProperty occlusion;
 uniform MaterialProperty emission;
 uniform MaterialProperty height;

 // Input uniform values
 uniform samplerCube irradianceMap;
 uniform samplerCube prefilterMap;
 uniform sampler2D brdfLUT;

 // Input lighting values
 uniform Light lights[MAX_LIGHTS];

 // Other uniform values
 uniform int renderMode;
 uniform vec3 viewPos;
 vec2 texCoord;

 // Constant values
 const float PI = 3.14159265359;

 // Output fragment color
 out vec4 finalColor;

 vec3 ComputeMaterialProperty(MaterialProperty property);
 float DistributionGGX(vec3 N, vec3 H, float roughness);
 float GeometrySchlickGGX(float NdotV, float roughness);
 float GeometrySmith(vec3 N, vec3 V, vec3 L, float roughness);
 vec3 fresnelSchlick(float cosTheta, vec3 F0);
 vec3 fresnelSchlickRoughness(float cosTheta, vec3 F0, float roughness);
 vec2 ParallaxMapping(vec2 texCoords, vec3 viewDir);

 // WARNING: There is some weird behaviour with this function, always returns black!
 // Yes, I even tried: return texture(property.sampler, texCoord).rgb;
 vec3 ComputeMaterialProperty(MaterialProperty property)
 {
    vec3 result = vec3(0.0, 0.0, 0.0);

    if (property.useSampler == 1) result = texture(property.sampler, texCoord).rgb;
    else result = property.color;

    return result;
 }

 float DistributionGGX(vec3 N, vec3 H, float roughness)
 {
    float a = roughness*roughness;
    float a2 = a*a;
    float NdotH = max(dot(N, H), 0.0);
    float NdotH2 = NdotH*NdotH;

    float nom = a2;
    float denom = (NdotH2*(a2 - 1.0) + 1.0);
    denom = PI*denom*denom;

    return nom/denom;
 }

 float GeometrySchlickGGX(float NdotV, float roughness)
 {
    float r = (roughness + 1.0);
    float k = r*r/8.0;

    float nom = NdotV;
    float denom = NdotV*(1.0 - k) + k;

    return nom/denom;
 }
 float GeometrySmith(vec3 N, vec3 V, vec3 L, float roughness)
 {
    float NdotV = max(dot(N, V), 0.0);
    float NdotL = max(dot(N, L), 0.0);
    float ggx2 = GeometrySchlickGGX(NdotV, roughness);
    float ggx1 = GeometrySchlickGGX(NdotL, roughness);

    return ggx1*ggx2;
 }

 vec3 fresnelSchlick(float cosTheta, vec3 F0)
 {
    return F0 + (1.0 - F0)*pow(1.0 - cosTheta, 5.0);
 }

 vec3 fresnelSchlickRoughness(float cosTheta, vec3 F0, float roughness)
 {
    return F0 + (max(vec3(1.0 - roughness), F0) - F0)*pow(1.0 - cosTheta, 5.0);
 }

 vec2 ParallaxMapping(vec2 texCoords, vec3 viewDir)
 {
    // Calculate the number of depth layers and calculate the size of each layer
    float numLayers = mix(MAX_DEPTH_LAYER, MIN_DEPTH_LAYER, abs(dot(vec3(0.0, 0.0, 1.0), viewDir)));  
    float layerDepth = 1.0/numLayers;

    // Calculate depth of current layer
    float currentLayerDepth = 0.0;

    // Calculate the amount to shift the texture coordinates per layer (from vector P)
    // Note: height amount is stored in height material attribute color R channel (sampler use is independent)
    vec2 P = viewDir.xy*height.color.r; 
    vec2 deltaTexCoords = P/numLayers;

    // Store initial texture coordinates and depth values
    vec2 currentTexCoords = texCoords;
    float currentDepthMapValue = texture(height.sampler, currentTexCoords).r;

    while (currentLayerDepth < currentDepthMapValue)
    {
        // Shift texture coordinates along direction of P
        currentTexCoords -= deltaTexCoords;

        // Get depth map value at current texture coordinates
        currentDepthMapValue = texture(height.sampler, currentTexCoords).r;

        // Get depth of next layer
        currentLayerDepth += layerDepth;  
    }

    // Get texture coordinates before collision (reverse operations)
    vec2 prevTexCoords = currentTexCoords + deltaTexCoords;

    // Get depth after and before collision for linear interpolation
    float afterDepth = currentDepthMapValue - currentLayerDepth;
    float beforeDepth = texture(height.sampler, prevTexCoords).r - currentLayerDepth + layerDepth;

    // Interpolation of texture coordinates
    float weight = afterDepth/(afterDepth - beforeDepth);
    vec2 finalTexCoords = prevTexCoords*weight + currentTexCoords*(1.0 - weight);

    return finalTexCoords;
 }

 void main()
 {
    // Calculate TBN and RM matrices
    mat3 TBN = transpose(mat3(fragTangent, fragBinormal, fragNormal));

    // Calculate lighting required attributes
    vec3 normal = normalize(fragNormal);
    vec3 view = normalize(viewPos - fragPosition);
    vec3 refl = reflect(-view, normal);

    // Check if parallax mapping is enabled and calculate texture coordinates to use based on height map
    // NOTE: remember that 'texCoord' variable must be assigned before calling any ComputeMaterialProperty() function
    if (height.useSampler == 1) texCoord = ParallaxMapping(fragTexCoord, view);
    else texCoord = fragTexCoord;   // Use default texture coordinates

    // Fetch material values from texture sampler or color attributes
    vec3 color = texture(albedo.sampler, texCoord).rgb; //ComputeMaterialProperty(albedo);
    vec3 metal = texture(metalness.sampler, texCoord).rgb; //ComputeMaterialProperty(metalness);
    vec3 rough = texture(roughness.sampler, texCoord).rgb; //ComputeMaterialProperty(roughness);
    vec3 emiss = texture(emission.sampler, texCoord).rgb; //ComputeMaterialProperty(emission);
    vec3 ao = texture(occlusion.sampler, texCoord).rgb; //ComputeMaterialProperty(occlusion);

    // Check if normal mapping is enabled
    if (normals.useSampler == 1)
    {
        // Fetch normal map color and transform lighting values to tangent space
        normal = texture(normals.sampler, texCoord).rgb; //ComputeMaterialProperty(normals);
        normal = normalize(normal*2.0 - 1.0);
        normal = normalize(normal*TBN);

        // Convert tangent space normal to world space due to cubemap reflection calculations
        refl = normalize(reflect(-view, normal));
    }

    // Calculate reflectance at normal incidence
    vec3 F0 = vec3(0.04);
    F0 = mix(F0, color, metal.r);

    // Calculate lighting for all lights
    vec3 Lo = vec3(0.0);
    vec3 lightDot = vec3(0.0);

    for (int i = 0; i < MAX_LIGHTS; i++)
    {
        if (lights[i].enabled == 1)
        {
            // Calculate per-light radiance
            vec3 light = vec3(0.0);
            vec3 radiance = lights[i].color.rgb;
            if (lights[i].type == LIGHT_DIRECTIONAL) light = -normalize(lights[i].target - lights[i].position);
            else if (lights[i].type == LIGHT_POINT)
            {
                light = normalize(lights[i].position - fragPosition);
                float distance = length(lights[i].position - fragPosition);
                float attenuation = 1.0/(distance*distance);
                radiance *= attenuation;
            }

            // Cook-torrance BRDF
            vec3 high = normalize(view + light);
            float NDF = DistributionGGX(normal, high, rough.r);
            float G = GeometrySmith(normal, view, light, rough.r);
            vec3 F = fresnelSchlick(max(dot(high, view), 0.0), F0);
            vec3 nominator = NDF*G*F;
            float denominator = 4*max(dot(normal, view), 0.0)*max(dot(normal, light), 0.0) + 0.001;
            vec3 brdf = nominator/denominator;

            // Store to kS the fresnel value and calculate energy conservation
            vec3 kS = F;
            vec3 kD = vec3(1.0) - kS;

            // Multiply kD by the inverse metalness such that only non-metals have diffuse lighting
            kD *= 1.0 - metal.r;

            // Scale light by dot product between normal and light direction
            float NdotL = max(dot(normal, light), 0.0);

            // Add to outgoing radiance Lo
            // Note: BRDF is already multiplied by the Fresnel so it doesn't need to be multiplied again
            Lo += (kD*color/PI + brdf)*radiance*NdotL*lights[i].color.a;
            lightDot += radiance*NdotL + brdf*lights[i].color.a;
        }
    }

    // Calculate ambient lighting using IBL
    vec3 F = fresnelSchlickRoughness(max(dot(normal, view), 0.0), F0, rough.r);
    vec3 kS = F;
    vec3 kD = 1.0 - kS;
    kD *= 1.0 - metal.r;

    // Calculate indirect diffuse
    vec3 irradiance = texture(irradianceMap, fragNormal).rgb;
    vec3 diffuse = color*irradiance;

    // Sample both the prefilter map and the BRDF lut and combine them together as per the Split-Sum approximation
    vec3 prefilterColor = textureLod(prefilterMap, refl, rough.r*MAX_REFLECTION_LOD).rgb;
    vec2 brdf = texture(brdfLUT, vec2(max(dot(normal, view), 0.0), rough.r)).rg;
    vec3 reflection = prefilterColor*(F*brdf.x + brdf.y);

    // Calculate final lighting
    vec3 ambient = (kD*diffuse + reflection)*ao;

    // Calculate fragment color based on render mode
    vec3 fragmentColor = ambient + Lo + emiss;                              // Physically Based Rendering

    if (renderMode == 1) fragmentColor = color;                             // Albedo
    else if (renderMode == 2) fragmentColor = normal;                       // Normals
    else if (renderMode == 3) fragmentColor = metal;                        // Metalness
    else if (renderMode == 4) fragmentColor = rough;                        // Roughness
    else if (renderMode == 5) fragmentColor = ao;                           // Ambient Occlusion
    else if (renderMode == 6) fragmentColor = emiss;                        // Emission
    else if (renderMode == 7) fragmentColor = lightDot;                     // Lighting
    else if (renderMode == 8) fragmentColor = kS;                           // Fresnel
    else if (renderMode == 9) fragmentColor = irradiance;                   // Irradiance
    else if (renderMode == 10) fragmentColor = reflection;                  // Reflection

    // Apply HDR tonemapping
    fragmentColor = fragmentColor/(fragmentColor + vec3(1.0));

    // Apply gamma correction
    fragmentColor = pow(fragmentColor, vec3(1.0/2.2));

    // Calculate final fragment color
    finalColor = vec4(fragmentColor, 1.0);
 }
--- a/examples/models/resources/shaders/glsl330/pbr.vs
+++ b/examples/models/resources/shaders/glsl330/pbr.vs
@ -1,41 +0,0 @@
 #version 330

 // Input vertex attributes
 in vec3 vertexPosition;
 in vec2 vertexTexCoord;
 in vec3 vertexNormal;
 in vec4 vertexTangent;

 // Input uniform values
 uniform mat4 mvp;
 uniform mat4 matModel;

 // Output vertex attributes (to fragment shader)
 out vec3 fragPosition;
 out vec2 fragTexCoord;
 out vec3 fragNormal;
 out vec3 fragTangent;
 out vec3 fragBinormal;

 void main()
 {
    // Calculate binormal from vertex normal and tangent
    vec3 vertexBinormal = cross(vertexNormal, vec3(vertexTangent));

    // Calculate fragment normal based on normal transformations
    mat3 normalMatrix = transpose(inverse(mat3(matModel)));

    // Calculate fragment position based on model transformations
    fragPosition = vec3(matModel*vec4(vertexPosition, 1.0));

    // Send vertex attributes to fragment shader
    fragTexCoord = vertexTexCoord;
    fragNormal = normalize(normalMatrix*vertexNormal);
    fragTangent = normalize(normalMatrix*vec3(vertexTangent));
    fragTangent = normalize(fragTangent - dot(fragTangent, fragNormal)*fragNormal);
    fragBinormal = normalize(normalMatrix*vertexBinormal);
    fragBinormal = cross(fragNormal, fragTangent);

    // Calculate final vertex position
    gl_Position = mvp*vec4(vertexPosition, 1.0);
 }
--- a/examples/models/resources/shaders/glsl330/prefilter.fs
+++ b/examples/models/resources/shaders/glsl330/prefilter.fs
@ -1,113 +0,0 @@
 #version 330

 #define MAX_SAMPLES          1024u
 #define CUBEMAP_RESOLUTION   1024.0

 // Input vertex attributes (from vertex shader)
 in vec3 fragPosition;

 // Input uniform values
 uniform samplerCube environmentMap;
 uniform float roughness;

 // Constant values
 const float PI = 3.14159265359;

 // Output fragment color
 out vec4 finalColor;

 float DistributionGGX(vec3 N, vec3 H, float roughness);
 float RadicalInverse_VdC(uint bits);
 vec2 Hammersley(uint i, uint N);
 vec3 ImportanceSampleGGX(vec2 Xi, vec3 N, float roughness);

 float DistributionGGX(vec3 N, vec3 H, float roughness)
 {
    float a = roughness*roughness;
    float a2 = a*a;
    float NdotH = max(dot(N, H), 0.0);
    float NdotH2 = NdotH*NdotH;

    float nom = a2;
    float denom = (NdotH2*(a2 - 1.0) + 1.0);
    denom = PI*denom*denom;

    return nom/denom;
 }

 float RadicalInverse_VdC(uint bits)
 {
     bits = (bits << 16u) | (bits >> 16u);
     bits = ((bits & 0x55555555u) << 1u) | ((bits & 0xAAAAAAAAu) >> 1u);
     bits = ((bits & 0x33333333u) << 2u) | ((bits & 0xCCCCCCCCu) >> 2u);
     bits = ((bits & 0x0F0F0F0Fu) << 4u) | ((bits & 0xF0F0F0F0u) >> 4u);
     bits = ((bits & 0x00FF00FFu) << 8u) | ((bits & 0xFF00FF00u) >> 8u);
     return float(bits)*2.3283064365386963e-10; // / 0x100000000
 }

 vec2 Hammersley(uint i, uint N)
 {
    return vec2(float(i)/float(N), RadicalInverse_VdC(i));
 }

 vec3 ImportanceSampleGGX(vec2 Xi, vec3 N, float roughness)
 {
    float a = roughness*roughness;
    float phi = 2.0*PI*Xi.x;
    float cosTheta = sqrt((1.0 - Xi.y)/(1.0 + (a*a - 1.0)*Xi.y));
    float sinTheta = sqrt(1.0 - cosTheta*cosTheta);

    // Transform from spherical coordinates to cartesian coordinates (halfway vector)
    vec3 H = vec3(cos(phi)*sinTheta, sin(phi)*sinTheta, cosTheta);

    // Transform from tangent space H vector to world space sample vector
    vec3 up = ((abs(N.z) < 0.999) ? vec3(0.0, 0.0, 1.0) : vec3(1.0, 0.0, 0.0));
    vec3 tangent = normalize(cross(up, N));
    vec3 bitangent = cross(N, tangent);
    vec3 sampleVec = tangent*H.x + bitangent*H.y + N*H.z;

    return normalize(sampleVec);
 }

 void main()
 {
    // Make the simplyfying assumption that V equals R equals the normal 
    vec3 N = normalize(fragPosition);
    vec3 R = N;
    vec3 V = R;

    vec3 prefilteredColor = vec3(0.0);
    float totalWeight = 0.0;

    for (uint i = 0u; i < MAX_SAMPLES; i++)
    {
        // Generate a sample vector that's biased towards the preferred alignment direction (importance sampling)
        vec2 Xi = Hammersley(i, MAX_SAMPLES);
        vec3 H = ImportanceSampleGGX(Xi, N, roughness);
        vec3 L  = normalize(2.0*dot(V, H)*H - V);

        float NdotL = max(dot(N, L), 0.0);
        if(NdotL > 0.0)
        {
            // Sample from the environment's mip level based on roughness/pdf
            float D = DistributionGGX(N, H, roughness);
            float NdotH = max(dot(N, H), 0.0);
            float HdotV = max(dot(H, V), 0.0);
            float pdf = D*NdotH/(4.0*HdotV) + 0.0001; 

            float resolution = CUBEMAP_RESOLUTION;
            float saTexel  = 4.0*PI/(6.0*resolution*resolution);
            float saSample = 1.0/(float(MAX_SAMPLES)*pdf + 0.0001);
            float mipLevel = ((roughness == 0.0) ? 0.0 : 0.5*log2(saSample/saTexel)); 

            prefilteredColor += textureLod(environmentMap, L, mipLevel).rgb*NdotL;
            totalWeight += NdotL;
        }
    }

    // Calculate prefilter average color
    prefilteredColor = prefilteredColor/totalWeight;

    // Calculate final fragment color
    finalColor = vec4(prefilteredColor, 1.0);
 }