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raylib-src
mirror of https://github.com/raysan5/raylib


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

								*

								*   raylib [shaders] example - depth rendering

								*

								*   Example complexity rating: [★★★☆] 3/4

								*

								*   Example originally created with raylib 5.6-dev, last time updated with raylib 5.6-dev

								*

								*   Example contributed by Luís Almeida (@luis605) 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) 2025 Luís Almeida (@luis605)

								*

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


								#include "raylib.h"


								#include "rlgl.h"


								#if defined(PLATFORM_DESKTOP)

								    #define GLSL_VERSION            330

								#else   // PLATFORM_ANDROID, PLATFORM_WEB

								    #define GLSL_VERSION            100

								#endif


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

								// Module Functions Declaration

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

								// Load custom render texture with depth texture attached

								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 - depth rendering");


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

								    Camera camera = { 0 };

								    camera.position = (Vector3){ 4.0f, 1.0f, 5.0f };

								    camera.target = (Vector3){ 0.0f, 0.0f, 0.0f };

								    camera.up = (Vector3){ 0.0f, 1.0f, 0.0f };

								    camera.fovy = 45.0f;

								    camera.projection = CAMERA_PERSPECTIVE;


								    // Load render texture with a depth texture attached

								    RenderTexture2D target = LoadRenderTextureDepthTex(screenWidth, screenHeight);


								    // Load depth shader and get depth texture shader location

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

								    int depthLoc = GetShaderLocation(depthShader, "depthTexture");

								    int flipTextureLoc = GetShaderLocation(depthShader, "flipY");

								    SetShaderValue(depthShader, flipTextureLoc, (int[]){ 1 }, SHADER_UNIFORM_INT); // Flip Y texture


								    // Load scene models

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

								    Model floor = LoadModelFromMesh(GenMeshPlane(20.0f, 20.0f, 1, 1));


								    DisableCursor();  // Limit cursor to relative movement inside the window


								    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_FREE);

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


								        // Draw

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

								        BeginTextureMode(target);

								            ClearBackground(WHITE);


								            BeginMode3D(camera);

								                DrawModel(cube, (Vector3){ 0.0f, 0.0f, 0.0f }, 3.0f, YELLOW);

								                DrawModel(floor, (Vector3){ 10.0f, 0.0f, 2.0f }, 2.0f, RED);

								            EndMode3D();

								        EndTextureMode();


								        // Draw into screen (main framebuffer)

								        BeginDrawing();

								            ClearBackground(RAYWHITE);


								            BeginShaderMode(depthShader);

								                SetShaderValueTexture(depthShader, depthLoc, target.depth);

								                DrawTexture(target.depth, 0, 0, WHITE);

								            EndShaderMode();


								            DrawRectangle( 10, 10, 320, 93, Fade(SKYBLUE, 0.5f));

								            DrawRectangleLines( 10, 10, 320, 93, BLUE);


								            DrawText("Camera Controls:", 20, 20, 10, BLACK);

								            DrawText("- WASD to move", 40, 40, 10, DARKGRAY);

								            DrawText("- Mouse Wheel Pressed to Pan", 40, 60, 10, DARKGRAY);

								            DrawText("- Z to zoom to (0, 0, 0)", 40, 80, 10, DARKGRAY);


								        EndDrawing();

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

								    }


								    // De-Initialization

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

								    UnloadModel(cube);              // Unload model

								    UnloadModel(floor);             // Unload model

								    UnloadRenderTextureDepthTex(target);

								    UnloadShader(depthShader);      // Unload shader


								    CloseWindow();        // Close window and OpenGL context

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


								    return 0;

								}


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

								// Module Functions Definition

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

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

								static 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: Not defined in raylib

								        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);

								    }

								}