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Diffstat (limited to 'deps/raylib/examples/shaders/shaders_hybrid_render.c')
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1 files changed, 208 insertions, 0 deletions
diff --git a/deps/raylib/examples/shaders/shaders_hybrid_render.c b/deps/raylib/examples/shaders/shaders_hybrid_render.c new file mode 100644 index 0000000..5bf2e49 --- /dev/null +++ b/deps/raylib/examples/shaders/shaders_hybrid_render.c @@ -0,0 +1,208 @@ +/******************************************************************************************* +* +* raylib [shaders] example - Hybrid Rendering +* +* 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" +#include "math.h" // Used for tan() +#include "raymath.h" // Used to calculate camera Direction + +#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); + +//------------------------------------------------------------------------------------ +// Declare custom Structs +//------------------------------------------------------------------------------------ + +typedef struct { + unsigned int camPos, camDir, screenCenter; +}RayLocs ; + +//------------------------------------------------------------------------------------ +// 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"); + + // This Shader calculates pixel depth and color using raymarch + Shader shdrRaymarch = LoadShader(0, TextFormat("resources/shaders/glsl%i/hybrid_raymarch.fs", GLSL_VERSION)); + + // This Shader is a standard rasterization fragment shader with the addition of depth writing + // You are required to write depth for all shaders if one shader does it + Shader shdrRaster = LoadShader(0, TextFormat("resources/shaders/glsl%i/hybrid_raster.fs", GLSL_VERSION)); + + // Declare Struct used to store camera locs. + RayLocs marchLocs = {0}; + + // Fill the struct with shader locs. + marchLocs.camPos = GetShaderLocation(shdrRaymarch, "camPos"); + marchLocs.camDir = GetShaderLocation(shdrRaymarch, "camDir"); + marchLocs.screenCenter = GetShaderLocation(shdrRaymarch, "screenCenter"); + + // Transfer screenCenter position to shader. Which is used to calculate ray direction. + Vector2 screenCenter = {.x = screenWidth/2.0f, .y = screenHeight/2.0f}; + SetShaderValue(shdrRaymarch, marchLocs.screenCenter , &screenCenter , SHADER_UNIFORM_VEC2); + + // 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){ 0.5f, 1.0f, 1.5f }, // 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 + }; + + // Camera FOV is pre-calculated in the camera Distance. + float camDist = 1.0f/(tanf(camera.fovy*0.5f*DEG2RAD)); + + 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); + + // Update Camera Postion in the ray march shader. + SetShaderValue(shdrRaymarch, marchLocs.camPos, &(camera.position), RL_SHADER_UNIFORM_VEC3); + + // Update Camera Looking Vector. Vector length determines FOV. + Vector3 camDir = Vector3Scale( Vector3Normalize( Vector3Subtract(camera.target, camera.position)) , camDist); + SetShaderValue(shdrRaymarch, marchLocs.camDir, &(camDir), RL_SHADER_UNIFORM_VEC3); + //---------------------------------------------------------------------------------- + + // Draw + //---------------------------------------------------------------------------------- + // Draw into our custom render texture (framebuffer) + BeginTextureMode(target); + ClearBackground(WHITE); + + // Raymarch Scene + rlEnableDepthTest(); //Manually enable Depth Test to handle multiple rendering methods. + BeginShaderMode(shdrRaymarch); + DrawRectangleRec((Rectangle){0,0, (float)screenWidth, (float)screenHeight},WHITE); + EndShaderMode(); + + // Rasterize Scene + BeginMode3D(camera); + BeginShaderMode(shdrRaster); + 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(shdrRaymarch); + UnloadShader(shdrRaster); + + 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); + } +} |