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

								*

								*   raylib [shaders] example - Depth buffer writing

								*

								*   Example originally created with raylib 4.2, last time updated with raylib 4.2

								*

								*   Example contributed by Buğra Alptekin Sarı (@BugraAlptekinSari) 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) 2022-2024 Buğra Alptekin Sarı (@BugraAlptekinSari)

								*

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


								#include "raylib.h"


								#include "rlgl.h"


								#if defined(PLATFORM_DESKTOP)

								#define GLSL_VERSION            330

								#else   // PLATFORM_ANDROID, PLATFORM_WEB

								#define GLSL_VERSION            100

								#endif


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

								// Declare custom functions required for the example

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

								// Load custom render texture, create a writable depth texture buffer

								static RenderTexture2D LoadRenderTextureDepthTex(int width, int height);


								// Unload render texture from GPU memory (VRAM)

								static void UnloadRenderTextureDepthTex(RenderTexture2D target);


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

								// Program main entry point

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

								int main(void)

								{

								    // Initialization

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

								    const int screenWidth = 800;

								    const int screenHeight = 450;


								    InitWindow(screenWidth, screenHeight, "raylib [shaders] example - write depth buffer");


								    // The shader inverts the depth buffer by writing into it by `gl_FragDepth = 1 - gl_FragCoord.z;`

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


								    // Use Customized function to create writable depth texture buffer

								    RenderTexture2D target = LoadRenderTextureDepthTex(screenWidth, screenHeight);


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

								    Camera camera = {

								        .position = (Vector3){ 2.0f, 2.0f, 3.0f },    // Camera position

								        .target = (Vector3){ 0.0f, 0.5f, 0.0f },      // Camera looking at point

								        .up = (Vector3){ 0.0f, 1.0f, 0.0f },          // Camera up vector (rotation towards target)

								        .fovy = 45.0f,                                // Camera field-of-view Y

								        .projection = CAMERA_PERSPECTIVE              // Camera projection type

								    };


								    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);

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


								        // Draw

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


								        // Draw into our custom render texture (framebuffer)

								        BeginTextureMode(target);

								            ClearBackground(WHITE);


								            BeginMode3D(camera);

								                BeginShaderMode(shader);

								                    DrawCubeWiresV((Vector3){ 0.0f, 0.5f, 1.0f }, (Vector3){ 1.0f, 1.0f, 1.0f }, RED);

								                    DrawCubeV((Vector3){ 0.0f, 0.5f, 1.0f }, (Vector3){ 1.0f, 1.0f, 1.0f }, PURPLE);

								                    DrawCubeWiresV((Vector3){ 0.0f, 0.5f, -1.0f }, (Vector3){ 1.0f, 1.0f, 1.0f }, DARKGREEN);

								                    DrawCubeV((Vector3) { 0.0f, 0.5f, -1.0f }, (Vector3){ 1.0f, 1.0f, 1.0f }, YELLOW);

								                    DrawGrid(10, 1.0f);

								                EndShaderMode();

								            EndMode3D();

								        EndTextureMode();


								        // Draw into screen our custom render texture

								        BeginDrawing();

								            ClearBackground(RAYWHITE);


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

								            DrawFPS(10, 10);

								        EndDrawing();

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

								    }


								    // De-Initialization

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

								    UnloadRenderTextureDepthTex(target);

								    UnloadShader(shader);


								    CloseWindow();        // Close window and OpenGL context

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


								    return 0;

								}


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

								// Define custom functions required for the example

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

								// Load custom render texture, create a writable depth texture buffer

								RenderTexture2D LoadRenderTextureDepthTex(int width, int height)

								{

								    RenderTexture2D target = { 0 };


								    target.id = rlLoadFramebuffer(); // Load an empty framebuffer


								    if (target.id > 0)

								    {

								        rlEnableFramebuffer(target.id);


								        // Create color texture (default to RGBA)

								        target.texture.id = rlLoadTexture(0, width, height, PIXELFORMAT_UNCOMPRESSED_R8G8B8A8, 1);

								        target.texture.width = width;

								        target.texture.height = height;

								        target.texture.format = PIXELFORMAT_UNCOMPRESSED_R8G8B8A8;

								        target.texture.mipmaps = 1;


								        // Create depth texture buffer (instead of raylib default renderbuffer)

								        target.depth.id = rlLoadTextureDepth(width, height, false);

								        target.depth.width = width;

								        target.depth.height = height;

								        target.depth.format = 19;       //DEPTH_COMPONENT_24BIT?

								        target.depth.mipmaps = 1;


								        // Attach color texture and depth texture to FBO

								        rlFramebufferAttach(target.id, target.texture.id, RL_ATTACHMENT_COLOR_CHANNEL0, RL_ATTACHMENT_TEXTURE2D, 0);

								        rlFramebufferAttach(target.id, target.depth.id, RL_ATTACHMENT_DEPTH, RL_ATTACHMENT_TEXTURE2D, 0);


								        // Check if fbo is complete with attachments (valid)

								        if (rlFramebufferComplete(target.id)) TRACELOG(LOG_INFO, "FBO: [ID %i] Framebuffer object created successfully", target.id);


								        rlDisableFramebuffer();

								    }

								    else TRACELOG(LOG_WARNING, "FBO: Framebuffer object can not be created");


								    return target;

								}


								// Unload render texture from GPU memory (VRAM)

								void UnloadRenderTextureDepthTex(RenderTexture2D target)

								{

								    if (target.id > 0)

								    {

								        // Color texture attached to FBO is deleted

								        rlUnloadTexture(target.texture.id);

								        rlUnloadTexture(target.depth.id);


								        // NOTE: Depth texture is automatically

								        // queried and deleted before deleting framebuffer

								        rlUnloadFramebuffer(target.id);

								    }

								}