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Copy pathshaders_depth_rendering.c
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183 lines (148 loc) · 7.27 KB
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/*******************************************************************************************
*
* 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);
}
}