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authorbonmas14 <bonmas14@gmail.com>2025-09-20 22:28:15 +0300
committerbonmas14 <bonmas14@gmail.com>2025-09-20 22:28:15 +0300
commitcdda4c4182c9ee068567529715e4a5c68a8efb58 (patch)
tree38a63f62a64018a2d35fc33354f8589fd33b7514 /deps/raylib/examples/shaders/shaders_write_depth.c
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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);
+ }
+} \ No newline at end of file