530 lines
27 KiB
C
530 lines
27 KiB
C
/*******************************************************************************************
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*
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* raylib [models] example - PBR material
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*
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* NOTE: This example requires raylib OpenGL 3.3 for shaders support and only #version 330
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* is currently supported. OpenGL ES 2.0 platforms are not supported at the moment.
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*
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* This example has been created using raylib 1.8 (www.raylib.com)
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* raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
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*
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* Copyright (c) 2017 Ramon Santamaria (@raysan5)
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*
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********************************************************************************************/
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#include "raylib.h"
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#include "raymath.h"
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#include "rlgl.h"
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#include <stdio.h>
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#define RLIGHTS_IMPLEMENTATION
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#include "rlights.h"
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#if defined(PLATFORM_DESKTOP)
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#define GLSL_VERSION 330
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#else // PLATFORM_RPI, PLATFORM_ANDROID, PLATFORM_WEB
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#define GLSL_VERSION 100
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#endif
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#define CUBEMAP_SIZE 1024 // Cubemap texture size
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#define IRRADIANCE_SIZE 32 // Irradiance texture size
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#define PREFILTERED_SIZE 256 // Prefiltered HDR environment texture size
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#define BRDF_SIZE 512 // BRDF LUT texture size
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#define LIGHT_DISTANCE 1000.0f
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#define LIGHT_HEIGHT 1.0f
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// PBR texture maps generation
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static TextureCubemap GenTextureCubemap(Shader shader, Texture2D panorama, int size, int format); // Generate cubemap (6 faces) from equirectangular (panorama) texture
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static TextureCubemap GenTextureIrradiance(Shader shader, TextureCubemap cubemap, int size); // Generate irradiance cubemap using cubemap texture
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static TextureCubemap GenTexturePrefilter(Shader shader, TextureCubemap cubemap, int size); // Generate prefilter cubemap using cubemap texture
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static Texture2D GenTextureBRDF(Shader shader, int size); // Generate a generic BRDF texture
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// PBR material loading
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static Material LoadMaterialPBR(Color albedo, float metalness, float roughness);
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int main(void)
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{
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// Initialization
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//--------------------------------------------------------------------------------------
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const int screenWidth = 800;
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const int screenHeight = 450;
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SetConfigFlags(FLAG_MSAA_4X_HINT); // Enable Multi Sampling Anti Aliasing 4x (if available)
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InitWindow(screenWidth, screenHeight, "raylib [models] example - pbr material");
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// Define the camera to look into our 3d world
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Camera camera = { 0 };
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camera.position = (Vector3){ 4.0f, 4.0f, 4.0f }; // Camera position
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camera.target = (Vector3){ 0.0f, 0.5f, 0.0f }; // Camera looking at point
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camera.up = (Vector3){ 0.0f, 1.0f, 0.0f }; // Camera up vector (rotation towards target)
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camera.fovy = 45.0f; // Camera field-of-view Y
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camera.projection = CAMERA_PERSPECTIVE; // Camera mode type
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// Load model and PBR material
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Model model = LoadModel("resources/pbr/trooper.obj");
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// Mesh tangents are generated... and uploaded to GPU
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// NOTE: New VBO for tangents is generated at default location and also binded to mesh VAO
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//MeshTangents(&model.meshes[0]);
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model.materials[0] = LoadMaterialPBR((Color){ 255, 255, 255, 255 }, 1.0f, 1.0f);
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// Create lights
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// NOTE: Lights are added to an internal lights pool automatically
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CreateLight(LIGHT_POINT, (Vector3){ LIGHT_DISTANCE, LIGHT_HEIGHT, 0.0f }, (Vector3){ 0.0f, 0.0f, 0.0f }, (Color){ 255, 0, 0, 255 }, model.materials[0].shader);
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CreateLight(LIGHT_POINT, (Vector3){ 0.0f, LIGHT_HEIGHT, LIGHT_DISTANCE }, (Vector3){ 0.0f, 0.0f, 0.0f }, (Color){ 0, 255, 0, 255 }, model.materials[0].shader);
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CreateLight(LIGHT_POINT, (Vector3){ -LIGHT_DISTANCE, LIGHT_HEIGHT, 0.0f }, (Vector3){ 0.0f, 0.0f, 0.0f }, (Color){ 0, 0, 255, 255 }, model.materials[0].shader);
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CreateLight(LIGHT_DIRECTIONAL, (Vector3){ 0.0f, LIGHT_HEIGHT*2.0f, -LIGHT_DISTANCE }, (Vector3){ 0.0f, 0.0f, 0.0f }, (Color){ 255, 0, 255, 255 }, model.materials[0].shader);
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SetCameraMode(camera, CAMERA_ORBITAL); // Set an orbital camera mode
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SetTargetFPS(60); // Set our game to run at 60 frames-per-second
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//--------------------------------------------------------------------------------------
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// Main game loop
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while (!WindowShouldClose()) // Detect window close button or ESC key
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{
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// Update
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//----------------------------------------------------------------------------------
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UpdateCamera(&camera); // Update camera
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// Send to material PBR shader camera view position
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float cameraPos[3] = { camera.position.x, camera.position.y, camera.position.z };
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SetShaderValue(model.materials[0].shader, model.materials[0].shader.locs[SHADER_LOC_VECTOR_VIEW], cameraPos, SHADER_UNIFORM_VEC3);
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//----------------------------------------------------------------------------------
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// Draw
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//----------------------------------------------------------------------------------
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BeginDrawing();
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ClearBackground(RAYWHITE);
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BeginMode3D(camera);
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DrawModel(model, Vector3Zero(), 1.0f, WHITE);
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DrawGrid(10, 1.0f);
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EndMode3D();
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DrawFPS(10, 10);
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EndDrawing();
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//----------------------------------------------------------------------------------
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}
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// De-Initialization
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//--------------------------------------------------------------------------------------
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UnloadMaterial(model.materials[0]); // Unload material: shader and textures
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UnloadModel(model); // Unload model
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CloseWindow(); // Close window and OpenGL context
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//--------------------------------------------------------------------------------------
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return 0;
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}
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// Load PBR material (Supports: ALBEDO, NORMAL, METALNESS, ROUGHNESS, AO, EMMISIVE, HEIGHT maps)
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// NOTE: PBR shader is loaded inside this function
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static Material LoadMaterialPBR(Color albedo, float metalness, float roughness)
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{
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Material mat = LoadMaterialDefault(); // Initialize material to default
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// Load PBR shader (requires several maps)
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mat.shader = LoadShader(TextFormat("resources/shaders/glsl%i/pbr.vs", GLSL_VERSION),
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TextFormat("resources/shaders/glsl%i/pbr.fs", GLSL_VERSION));
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// Get required locations points for PBR material
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// NOTE: Those location names must be available and used in the shader code
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mat.shader.locs[SHADER_LOC_MAP_ALBEDO] = GetShaderLocation(mat.shader, "albedo.sampler");
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mat.shader.locs[SHADER_LOC_MAP_METALNESS] = GetShaderLocation(mat.shader, "metalness.sampler");
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mat.shader.locs[SHADER_LOC_MAP_NORMAL] = GetShaderLocation(mat.shader, "normals.sampler");
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mat.shader.locs[SHADER_LOC_MAP_ROUGHNESS] = GetShaderLocation(mat.shader, "roughness.sampler");
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mat.shader.locs[SHADER_LOC_MAP_OCCLUSION] = GetShaderLocation(mat.shader, "occlusion.sampler");
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//mat.shader.locs[SHADER_LOC_MAP_EMISSION] = GetShaderLocation(mat.shader, "emission.sampler");
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//mat.shader.locs[SHADER_LOC_MAP_HEIGHT] = GetShaderLocation(mat.shader, "height.sampler");
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mat.shader.locs[SHADER_LOC_MAP_IRRADIANCE] = GetShaderLocation(mat.shader, "irradianceMap");
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mat.shader.locs[SHADER_LOC_MAP_PREFILTER] = GetShaderLocation(mat.shader, "prefilterMap");
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mat.shader.locs[SHADER_LOC_MAP_BRDF] = GetShaderLocation(mat.shader, "brdfLUT");
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// Set view matrix location
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mat.shader.locs[SHADER_LOC_MATRIX_MODEL] = GetShaderLocation(mat.shader, "matModel");
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//mat.shader.locs[SHADER_LOC_MATRIX_VIEW] = GetShaderLocation(mat.shader, "view");
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mat.shader.locs[SHADER_LOC_VECTOR_VIEW] = GetShaderLocation(mat.shader, "viewPos");
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// Set PBR standard maps
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mat.maps[MATERIAL_MAP_ALBEDO].texture = LoadTexture("resources/pbr/trooper_albedo.png");
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mat.maps[MATERIAL_MAP_NORMAL].texture = LoadTexture("resources/pbr/trooper_normals.png");
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mat.maps[MATERIAL_MAP_METALNESS].texture = LoadTexture("resources/pbr/trooper_metalness.png");
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mat.maps[MATERIAL_MAP_ROUGHNESS].texture = LoadTexture("resources/pbr/trooper_roughness.png");
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mat.maps[MATERIAL_MAP_OCCLUSION].texture = LoadTexture("resources/pbr/trooper_ao.png");
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// Set textures filtering for better quality
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SetTextureFilter(mat.maps[MATERIAL_MAP_ALBEDO].texture, FILTER_BILINEAR);
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SetTextureFilter(mat.maps[MATERIAL_MAP_NORMAL].texture, FILTER_BILINEAR);
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SetTextureFilter(mat.maps[MATERIAL_MAP_METALNESS].texture, FILTER_BILINEAR);
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SetTextureFilter(mat.maps[MATERIAL_MAP_ROUGHNESS].texture, FILTER_BILINEAR);
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SetTextureFilter(mat.maps[MATERIAL_MAP_OCCLUSION].texture, FILTER_BILINEAR);
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// Enable sample usage in shader for assigned textures
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SetShaderValue(mat.shader, GetShaderLocation(mat.shader, "albedo.useSampler"), (int[1]){ 1 }, SHADER_UNIFORM_INT);
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SetShaderValue(mat.shader, GetShaderLocation(mat.shader, "normals.useSampler"), (int[1]){ 1 }, SHADER_UNIFORM_INT);
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SetShaderValue(mat.shader, GetShaderLocation(mat.shader, "metalness.useSampler"), (int[1]){ 1 }, SHADER_UNIFORM_INT);
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SetShaderValue(mat.shader, GetShaderLocation(mat.shader, "roughness.useSampler"), (int[1]){ 1 }, SHADER_UNIFORM_INT);
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SetShaderValue(mat.shader, GetShaderLocation(mat.shader, "occlusion.useSampler"), (int[1]){ 1 }, SHADER_UNIFORM_INT);
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int renderModeLoc = GetShaderLocation(mat.shader, "renderMode");
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SetShaderValue(mat.shader, renderModeLoc, (int[1]){ 0 }, SHADER_UNIFORM_INT);
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// Set up material properties color
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mat.maps[MATERIAL_MAP_ALBEDO].color = albedo;
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mat.maps[MATERIAL_MAP_NORMAL].color = (Color){ 128, 128, 255, 255 };
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mat.maps[MATERIAL_MAP_METALNESS].value = metalness;
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mat.maps[MATERIAL_MAP_ROUGHNESS].value = roughness;
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mat.maps[MATERIAL_MAP_OCCLUSION].value = 1.0f;
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mat.maps[MATERIAL_MAP_EMISSION].value = 0.5f;
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mat.maps[MATERIAL_MAP_HEIGHT].value = 0.5f;
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// Generate cubemap from panorama texture
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//--------------------------------------------------------------------------------------------------------
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Texture2D panorama = LoadTexture("resources/dresden_square_2k.hdr");
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// Load equirectangular to cubemap shader
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Shader shdrCubemap = LoadShader(TextFormat("resources/shaders/glsl%i/pbr.vs", GLSL_VERSION),
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TextFormat("resources/shaders/glsl%i/pbr.fs", GLSL_VERSION));
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SetShaderValue(shdrCubemap, GetShaderLocation(shdrCubemap, "equirectangularMap"), (int[1]){ 0 }, SHADER_UNIFORM_INT);
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TextureCubemap cubemap = GenTextureCubemap(shdrCubemap, panorama, CUBEMAP_SIZE, PIXELFORMAT_UNCOMPRESSED_R32G32B32);
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UnloadTexture(panorama);
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UnloadShader(shdrCubemap);
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//--------------------------------------------------------------------------------------------------------
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// Generate irradiance map from cubemap texture
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//--------------------------------------------------------------------------------------------------------
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// Load irradiance (GI) calculation shader
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Shader shdrIrradiance = LoadShader(TextFormat("resources/shaders/glsl%i/skybox.vs", GLSL_VERSION),
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TextFormat("resources/shaders/glsl%i/irradiance.fs", GLSL_VERSION));
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SetShaderValue(shdrIrradiance, GetShaderLocation(shdrIrradiance, "environmentMap"), (int[1]){ 0 }, SHADER_UNIFORM_INT);
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mat.maps[MATERIAL_MAP_IRRADIANCE].texture = GenTextureIrradiance(shdrIrradiance, cubemap, IRRADIANCE_SIZE);
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UnloadShader(shdrIrradiance);
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//--------------------------------------------------------------------------------------------------------
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// Generate prefilter map from cubemap texture
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//--------------------------------------------------------------------------------------------------------
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// Load reflection prefilter calculation shader
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Shader shdrPrefilter = LoadShader(TextFormat("resources/shaders/glsl%i/skybox.vs", GLSL_VERSION),
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TextFormat("resources/shaders/glsl%i/prefilter.fs", GLSL_VERSION));
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SetShaderValue(shdrPrefilter, GetShaderLocation(shdrPrefilter, "environmentMap"), (int[1]){ 0 }, SHADER_UNIFORM_INT);
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mat.maps[MATERIAL_MAP_PREFILTER].texture = GenTexturePrefilter(shdrPrefilter, cubemap, PREFILTERED_SIZE);
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UnloadTexture(cubemap);
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UnloadShader(shdrPrefilter);
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//--------------------------------------------------------------------------------------------------------
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// Generate BRDF (bidirectional reflectance distribution function) texture (using shader)
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//--------------------------------------------------------------------------------------------------------
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Shader shdrBRDF = LoadShader(TextFormat("resources/shaders/glsl%i/brdf.vs", GLSL_VERSION),
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TextFormat("resources/shaders/glsl%i/brdf.fs", GLSL_VERSION));
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mat.maps[MATERIAL_MAP_BRDG].texture = GenTextureBRDF(shdrBRDF, BRDF_SIZE);
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UnloadShader(shdrBRDF);
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//--------------------------------------------------------------------------------------------------------
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return mat;
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}
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// Texture maps generation (PBR)
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//-------------------------------------------------------------------------------------------
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// Generate cubemap texture from HDR texture
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static TextureCubemap GenTextureCubemap(Shader shader, Texture2D panorama, int size, int format)
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{
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TextureCubemap cubemap = { 0 };
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rlDisableBackfaceCulling(); // Disable backface culling to render inside the cube
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// STEP 1: Setup framebuffer
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//------------------------------------------------------------------------------------------
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unsigned int rbo = rlLoadTextureDepth(size, size, true);
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cubemap.id = rlLoadTextureCubemap(NULL, size, format);
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unsigned int fbo = rlLoadFramebuffer(size, size);
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rlFramebufferAttach(fbo, rbo, RL_ATTACHMENT_DEPTH, RL_ATTACHMENT_RENDERBUFFER, 0);
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rlFramebufferAttach(fbo, cubemap.id, RL_ATTACHMENT_COLOR_CHANNEL0, RL_ATTACHMENT_CUBEMAP_POSITIVE_X, 0);
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// Check if framebuffer is complete with attachments (valid)
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if (rlFramebufferComplete(fbo)) TraceLog(LOG_INFO, "FBO: [ID %i] Framebuffer object created successfully", fbo);
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//------------------------------------------------------------------------------------------
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// STEP 2: Draw to framebuffer
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//------------------------------------------------------------------------------------------
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// NOTE: Shader is used to convert HDR equirectangular environment map to cubemap equivalent (6 faces)
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rlEnableShader(shader.id);
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// Define projection matrix and send it to shader
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Matrix matFboProjection = MatrixPerspective(90.0*DEG2RAD, 1.0, RL_CULL_DISTANCE_NEAR, RL_CULL_DISTANCE_FAR);
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rlSetUniformMatrix(shader.locs[SHADER_LOC_MATRIX_PROJECTION], matFboProjection);
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// Define view matrix for every side of the cubemap
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Matrix fboViews[6] = {
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MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ 1.0f, 0.0f, 0.0f }, (Vector3){ 0.0f, -1.0f, 0.0f }),
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MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ -1.0f, 0.0f, 0.0f }, (Vector3){ 0.0f, -1.0f, 0.0f }),
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MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ 0.0f, 1.0f, 0.0f }, (Vector3){ 0.0f, 0.0f, 1.0f }),
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MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ 0.0f, -1.0f, 0.0f }, (Vector3){ 0.0f, 0.0f, -1.0f }),
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MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ 0.0f, 0.0f, 1.0f }, (Vector3){ 0.0f, -1.0f, 0.0f }),
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MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ 0.0f, 0.0f, -1.0f }, (Vector3){ 0.0f, -1.0f, 0.0f })
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};
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rlViewport(0, 0, size, size); // Set viewport to current fbo dimensions
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for (int i = 0; i < 6; i++)
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{
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rlSetUniformMatrix(shader.locs[SHADER_LOC_MATRIX_VIEW], fboViews[i]);
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rlFramebufferAttach(fbo, cubemap.id, RL_ATTACHMENT_COLOR_CHANNEL0, RL_ATTACHMENT_CUBEMAP_POSITIVE_X + i, 0);
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rlEnableFramebuffer(fbo);
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rlSetTexture(panorama.id); // WARNING: It must be called after enabling current framebuffer if using internal batch system!
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rlClearScreenBuffers();
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DrawCubeV(Vector3Zero(), Vector3One(), WHITE);
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rlDrawRenderBatchActive();
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}
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//------------------------------------------------------------------------------------------
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// STEP 3: Unload framebuffer and reset state
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//------------------------------------------------------------------------------------------
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rlDisableShader(); // Unbind shader
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rlDisableTexture(); // Unbind texture
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rlDisableFramebuffer(); // Unbind framebuffer
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rlUnloadFramebuffer(fbo); // Unload framebuffer (and automatically attached depth texture/renderbuffer)
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// Reset viewport dimensions to default
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rlViewport(0, 0, rlGetFramebufferWidth(), rlGetFramebufferHeight());
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rlEnableBackfaceCulling();
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//------------------------------------------------------------------------------------------
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cubemap.width = size;
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cubemap.height = size;
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cubemap.mipmaps = 1;
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cubemap.format = PIXELFORMAT_UNCOMPRESSED_R32G32B32;
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return cubemap;
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}
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// Generate irradiance texture using cubemap data
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static TextureCubemap GenTextureIrradiance(Shader shader, TextureCubemap cubemap, int size)
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{
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TextureCubemap irradiance = { 0 };
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rlDisableBackfaceCulling(); // Disable backface culling to render inside the cube
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// STEP 1: Setup framebuffer
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//------------------------------------------------------------------------------------------
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unsigned int rbo = rlLoadTextureDepth(size, size, true);
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irradiance.id = rlLoadTextureCubemap(NULL, size, PIXELFORMAT_UNCOMPRESSED_R32G32B32);
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unsigned int fbo = rlLoadFramebuffer(size, size);
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rlFramebufferAttach(fbo, rbo, RL_ATTACHMENT_DEPTH, RL_ATTACHMENT_RENDERBUFFER, 0);
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rlFramebufferAttach(fbo, cubemap.id, RL_ATTACHMENT_COLOR_CHANNEL0, RL_ATTACHMENT_CUBEMAP_POSITIVE_X, 0);
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//------------------------------------------------------------------------------------------
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// STEP 2: Draw to framebuffer
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//------------------------------------------------------------------------------------------
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// NOTE: Shader is used to solve diffuse integral by convolution to create an irradiance cubemap
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rlEnableShader(shader.id);
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// Define projection matrix and send it to shader
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Matrix matFboProjection = MatrixPerspective(90.0*DEG2RAD, 1.0, RL_CULL_DISTANCE_NEAR, RL_CULL_DISTANCE_FAR);
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rlSetUniformMatrix(shader.locs[SHADER_LOC_MATRIX_PROJECTION], matFboProjection);
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// Define view matrix for every side of the cubemap
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Matrix fboViews[6] = {
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MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ 1.0f, 0.0f, 0.0f }, (Vector3){ 0.0f, -1.0f, 0.0f }),
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MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ -1.0f, 0.0f, 0.0f }, (Vector3){ 0.0f, -1.0f, 0.0f }),
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MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ 0.0f, 1.0f, 0.0f }, (Vector3){ 0.0f, 0.0f, 1.0f }),
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MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ 0.0f, -1.0f, 0.0f }, (Vector3){ 0.0f, 0.0f, -1.0f }),
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MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ 0.0f, 0.0f, 1.0f }, (Vector3){ 0.0f, -1.0f, 0.0f }),
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MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ 0.0f, 0.0f, -1.0f }, (Vector3){ 0.0f, -1.0f, 0.0f })
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};
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rlActiveTextureSlot(0);
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rlEnableTextureCubemap(cubemap.id);
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rlViewport(0, 0, size, size); // Set viewport to current fbo dimensions
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for (int i = 0; i < 6; i++)
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{
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rlSetUniformMatrix(shader.locs[SHADER_LOC_MATRIX_VIEW], fboViews[i]);
|
|
rlFramebufferAttach(fbo, irradiance.id, RL_ATTACHMENT_COLOR_CHANNEL0, RL_ATTACHMENT_CUBEMAP_POSITIVE_X + i, 0);
|
|
|
|
rlEnableFramebuffer(fbo);
|
|
rlClearScreenBuffers();
|
|
rlLoadDrawCube();
|
|
}
|
|
//------------------------------------------------------------------------------------------
|
|
|
|
// STEP 3: Unload framebuffer and reset state
|
|
//------------------------------------------------------------------------------------------
|
|
rlDisableShader(); // Unbind shader
|
|
rlDisableTexture(); // Unbind texture
|
|
rlDisableFramebuffer(); // Unbind framebuffer
|
|
rlUnloadFramebuffer(fbo); // Unload framebuffer (and automatically attached depth texture/renderbuffer)
|
|
|
|
// Reset viewport dimensions to default
|
|
rlViewport(0, 0, rlGetFramebufferWidth(), rlGetFramebufferHeight());
|
|
rlEnableBackfaceCulling();
|
|
//------------------------------------------------------------------------------------------
|
|
|
|
irradiance.width = size;
|
|
irradiance.height = size;
|
|
irradiance.mipmaps = 1;
|
|
irradiance.format = PIXELFORMAT_UNCOMPRESSED_R32G32B32;
|
|
|
|
return irradiance;
|
|
}
|
|
|
|
// Generate prefilter texture using cubemap data
|
|
static TextureCubemap GenTexturePrefilter(Shader shader, TextureCubemap cubemap, int size)
|
|
{
|
|
TextureCubemap prefilter = { 0 };
|
|
|
|
rlDisableBackfaceCulling(); // Disable backface culling to render inside the cube
|
|
|
|
// STEP 1: Setup framebuffer
|
|
//------------------------------------------------------------------------------------------
|
|
unsigned int rbo = rlLoadTextureDepth(size, size, true);
|
|
prefilter.id = rlLoadTextureCubemap(NULL, size, PIXELFORMAT_UNCOMPRESSED_R32G32B32);
|
|
rlTextureParameters(prefilter.id, RL_TEXTURE_MIN_FILTER, RL_TEXTURE_FILTER_MIP_LINEAR);
|
|
|
|
unsigned int fbo = rlLoadFramebuffer(size, size);
|
|
rlFramebufferAttach(fbo, rbo, RL_ATTACHMENT_DEPTH, RL_ATTACHMENT_RENDERBUFFER, 0);
|
|
rlFramebufferAttach(fbo, cubemap.id, RL_ATTACHMENT_COLOR_CHANNEL0, RL_ATTACHMENT_CUBEMAP_POSITIVE_X, 0);
|
|
//------------------------------------------------------------------------------------------
|
|
|
|
// Generate mipmaps for the prefiltered HDR texture
|
|
//glGenerateMipmap(GL_TEXTURE_CUBE_MAP); // TODO!
|
|
|
|
// STEP 2: Draw to framebuffer
|
|
//------------------------------------------------------------------------------------------
|
|
// NOTE: Shader is used to prefilter HDR and store data into mipmap levels
|
|
|
|
// Define projection matrix and send it to shader
|
|
Matrix fboProjection = MatrixPerspective(90.0*DEG2RAD, 1.0, RL_CULL_DISTANCE_NEAR, RL_CULL_DISTANCE_FAR);
|
|
rlEnableShader(shader.id);
|
|
rlSetUniformMatrix(shader.locs[SHADER_LOC_MATRIX_PROJECTION], fboProjection);
|
|
|
|
// Define view matrix for every side of the cubemap
|
|
Matrix fboViews[6] = {
|
|
MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ 1.0f, 0.0f, 0.0f }, (Vector3){ 0.0f, -1.0f, 0.0f }),
|
|
MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ -1.0f, 0.0f, 0.0f }, (Vector3){ 0.0f, -1.0f, 0.0f }),
|
|
MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ 0.0f, 1.0f, 0.0f }, (Vector3){ 0.0f, 0.0f, 1.0f }),
|
|
MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ 0.0f, -1.0f, 0.0f }, (Vector3){ 0.0f, 0.0f, -1.0f }),
|
|
MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ 0.0f, 0.0f, 1.0f }, (Vector3){ 0.0f, -1.0f, 0.0f }),
|
|
MatrixLookAt((Vector3){ 0.0f, 0.0f, 0.0f }, (Vector3){ 0.0f, 0.0f, -1.0f }, (Vector3){ 0.0f, -1.0f, 0.0f })
|
|
};
|
|
|
|
rlActiveTextureSlot(0);
|
|
rlEnableTextureCubemap(cubemap.id);
|
|
|
|
// TODO: Locations should be taken out of this function... too shader dependant...
|
|
int roughnessLoc = rlGetLocationUniform(shader.id, "roughness");
|
|
|
|
rlEnableFramebuffer(fbo);
|
|
|
|
#define MAX_MIPMAP_LEVELS 5 // Max number of prefilter texture mipmaps
|
|
|
|
for (int mip = 0; mip < MAX_MIPMAP_LEVELS; mip++)
|
|
{
|
|
// Resize framebuffer according to mip-level size.
|
|
unsigned int mipWidth = size*(int)powf(0.5f, (float)mip);
|
|
unsigned int mipHeight = size*(int)powf(0.5f, (float)mip);
|
|
|
|
rlViewport(0, 0, mipWidth, mipHeight);
|
|
|
|
//glBindRenderbuffer(GL_RENDERBUFFER, rbo);
|
|
//glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, mipWidth, mipHeight);
|
|
|
|
float roughness = (float)mip/(float)(MAX_MIPMAP_LEVELS - 1);
|
|
rlSetUniform(roughnessLoc, &roughness, SHADER_UNIFORM_FLOAT, 1);
|
|
|
|
for (int i = 0; i < 6; i++)
|
|
{
|
|
rlSetUniformMatrix(shader.locs[SHADER_LOC_MATRIX_VIEW], fboViews[i]);
|
|
rlFramebufferAttach(fbo, prefilter.id, RL_ATTACHMENT_COLOR_CHANNEL0, RL_ATTACHMENT_CUBEMAP_POSITIVE_X + i, mip);
|
|
|
|
rlClearScreenBuffers();
|
|
rlLoadDrawCube();
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------------------
|
|
|
|
// STEP 3: Unload framebuffer and reset state
|
|
//------------------------------------------------------------------------------------------
|
|
rlDisableShader(); // Unbind shader
|
|
rlDisableTexture(); // Unbind texture
|
|
rlDisableFramebuffer(); // Unbind framebuffer
|
|
rlUnloadFramebuffer(fbo); // Unload framebuffer (and automatically attached depth texture/renderbuffer)
|
|
|
|
// Reset viewport dimensions to default
|
|
rlViewport(0, 0, rlGetFramebufferWidth(), rlGetFramebufferHeight());
|
|
rlEnableBackfaceCulling();
|
|
//------------------------------------------------------------------------------------------
|
|
|
|
prefilter.width = size;
|
|
prefilter.height = size;
|
|
prefilter.mipmaps = MAX_MIPMAP_LEVELS;
|
|
prefilter.format = PIXELFORMAT_UNCOMPRESSED_R32G32B32;
|
|
|
|
return prefilter;
|
|
}
|
|
|
|
// Generate BRDF texture using cubemap data
|
|
// TODO: Review implementation: https://github.com/HectorMF/BRDFGenerator
|
|
static Texture2D GenTextureBRDF(Shader shader, int size)
|
|
{
|
|
Texture2D brdf = { 0 };
|
|
|
|
// STEP 1: Setup framebuffer
|
|
//------------------------------------------------------------------------------------------
|
|
unsigned int rbo = rlLoadTextureDepth(size, size, true);
|
|
brdf.id = rlLoadTexture(NULL, size, size, PIXELFORMAT_UNCOMPRESSED_R32G32B32, 1);
|
|
|
|
unsigned int fbo = rlLoadFramebuffer(size, size);
|
|
rlFramebufferAttach(fbo, rbo, RL_ATTACHMENT_DEPTH, RL_ATTACHMENT_RENDERBUFFER, 0);
|
|
rlFramebufferAttach(fbo, brdf.id, RL_ATTACHMENT_COLOR_CHANNEL0, RL_ATTACHMENT_TEXTURE2D, 0);
|
|
//------------------------------------------------------------------------------------------
|
|
|
|
// STEP 2: Draw to framebuffer
|
|
//------------------------------------------------------------------------------------------
|
|
// NOTE: Render BRDF LUT into a quad using FBO
|
|
rlEnableShader(shader.id);
|
|
|
|
rlViewport(0, 0, size, size);
|
|
|
|
rlEnableFramebuffer(fbo);
|
|
rlClearScreenBuffers();
|
|
|
|
rlLoadDrawQuad();
|
|
//------------------------------------------------------------------------------------------
|
|
|
|
// STEP 3: Unload framebuffer and reset state
|
|
//------------------------------------------------------------------------------------------
|
|
rlDisableShader(); // Unbind shader
|
|
rlDisableTexture(); // Unbind texture
|
|
rlDisableFramebuffer(); // Unbind framebuffer
|
|
rlUnloadFramebuffer(fbo); // Unload framebuffer (and automatically attached depth texture/renderbuffer)
|
|
|
|
// Reset viewport dimensions to default
|
|
rlViewport(0, 0, rlGetFramebufferWidth(), rlGetFramebufferHeight());
|
|
//------------------------------------------------------------------------------------------
|
|
|
|
brdf.width = size;
|
|
brdf.height = size;
|
|
brdf.mipmaps = 1;
|
|
brdf.format = PIXELFORMAT_UNCOMPRESSED_R32G32B32;
|
|
|
|
return brdf;
|
|
}
|