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235 lines
12 KiB
C
235 lines
12 KiB
C
/*******************************************************************************************
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*
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* raylib [models] example - PBR material
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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 <stdio.h>
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#define RLIGHTS_IMPLEMENTATION
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#include "rlights.h"
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#define CUBEMAP_SIZE 512 // 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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// 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.type = 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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UnloadMaterial(model.materials[0]); // get rid of default material
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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[LOC_VECTOR_VIEW], cameraPos, 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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// Shaders and textures must be unloaded by user,
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// they could be in use by other models
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UnloadTexture(model.materials[0].maps[MAP_ALBEDO].texture);
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UnloadTexture(model.materials[0].maps[MAP_NORMAL].texture);
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UnloadTexture(model.materials[0].maps[MAP_METALNESS].texture);
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UnloadTexture(model.materials[0].maps[MAP_ROUGHNESS].texture);
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UnloadTexture(model.materials[0].maps[MAP_OCCLUSION].texture);
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UnloadTexture(model.materials[0].maps[MAP_IRRADIANCE].texture);
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UnloadTexture(model.materials[0].maps[MAP_PREFILTER].texture);
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UnloadTexture(model.materials[0].maps[MAP_BRDF].texture);
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UnloadShader(model.materials[0].shader);
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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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#if defined(PLATFORM_DESKTOP)
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mat.shader = LoadShader("resources/shaders/glsl330/pbr.vs", "resources/shaders/glsl330/pbr.fs");
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#else // PLATFORM_RPI, PLATFORM_ANDROID, PLATFORM_WEB
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mat.shader = LoadShader("resources/shaders/glsl100/pbr.vs", "resources/shaders/glsl100/pbr.fs");
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#endif
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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[LOC_MAP_ALBEDO] = GetShaderLocation(mat.shader, "albedo.sampler");
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mat.shader.locs[LOC_MAP_METALNESS] = GetShaderLocation(mat.shader, "metalness.sampler");
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mat.shader.locs[LOC_MAP_NORMAL] = GetShaderLocation(mat.shader, "normals.sampler");
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mat.shader.locs[LOC_MAP_ROUGHNESS] = GetShaderLocation(mat.shader, "roughness.sampler");
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mat.shader.locs[LOC_MAP_OCCLUSION] = GetShaderLocation(mat.shader, "occlusion.sampler");
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//mat.shader.locs[LOC_MAP_EMISSION] = GetShaderLocation(mat.shader, "emission.sampler");
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//mat.shader.locs[LOC_MAP_HEIGHT] = GetShaderLocation(mat.shader, "height.sampler");
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mat.shader.locs[LOC_MAP_IRRADIANCE] = GetShaderLocation(mat.shader, "irradianceMap");
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mat.shader.locs[LOC_MAP_PREFILTER] = GetShaderLocation(mat.shader, "prefilterMap");
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mat.shader.locs[LOC_MAP_BRDF] = GetShaderLocation(mat.shader, "brdfLUT");
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// Set view matrix location
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mat.shader.locs[LOC_MATRIX_MODEL] = GetShaderLocation(mat.shader, "matModel");
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//mat.shader.locs[LOC_MATRIX_VIEW] = GetShaderLocation(mat.shader, "view");
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mat.shader.locs[LOC_VECTOR_VIEW] = GetShaderLocation(mat.shader, "viewPos");
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// Set PBR standard maps
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mat.maps[MAP_ALBEDO].texture = LoadTexture("resources/pbr/trooper_albedo.png");
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mat.maps[MAP_NORMAL].texture = LoadTexture("resources/pbr/trooper_normals.png");
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mat.maps[MAP_METALNESS].texture = LoadTexture("resources/pbr/trooper_metalness.png");
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mat.maps[MAP_ROUGHNESS].texture = LoadTexture("resources/pbr/trooper_roughness.png");
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mat.maps[MAP_OCCLUSION].texture = LoadTexture("resources/pbr/trooper_ao.png");
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// Load equirectangular to cubemap shader
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#if defined(PLATFORM_DESKTOP)
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Shader shdrCubemap = LoadShader("resources/shaders/glsl330/cubemap.vs", "resources/shaders/glsl330/cubemap.fs");
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#else // PLATFORM_RPI, PLATFORM_ANDROID, PLATFORM_WEB
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Shader shdrCubemap = LoadShader("resources/shaders/glsl100/cubemap.vs", "resources/shaders/glsl100/cubemap.fs");
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#endif
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// Load irradiance (GI) calculation shader
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#if defined(PLATFORM_DESKTOP)
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Shader shdrIrradiance = LoadShader("resources/shaders/glsl330/skybox.vs", "resources/shaders/glsl330/irradiance.fs");
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#else // PLATFORM_RPI, PLATFORM_ANDROID, PLATFORM_WEB
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Shader shdrIrradiance = LoadShader("resources/shaders/glsl100/skybox.vs", "resources/shaders/glsl100/irradiance.fs");
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#endif
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// Load reflection prefilter calculation shader
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#if defined(PLATFORM_DESKTOP)
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Shader shdrPrefilter = LoadShader("resources/shaders/glsl330/skybox.vs", "resources/shaders/glsl330/prefilter.fs");
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#else
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Shader shdrPrefilter = LoadShader("resources/shaders/glsl100/skybox.vs", "resources/shaders/glsl100/prefilter.fs");
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#endif
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// Load bidirectional reflectance distribution function shader
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#if defined(PLATFORM_DESKTOP)
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Shader shdrBRDF = LoadShader("resources/shaders/glsl330/brdf.vs", "resources/shaders/glsl330/brdf.fs");
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#else
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Shader shdrBRDF = LoadShader("resources/shaders/glsl100/brdf.vs", "resources/shaders/glsl100/brdf.fs");
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#endif
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// Setup required shader locations
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SetShaderValue(shdrCubemap, GetShaderLocation(shdrCubemap, "equirectangularMap"), (int[1]){ 0 }, UNIFORM_INT);
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SetShaderValue(shdrIrradiance, GetShaderLocation(shdrIrradiance, "environmentMap"), (int[1]){ 0 }, UNIFORM_INT);
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SetShaderValue(shdrPrefilter, GetShaderLocation(shdrPrefilter, "environmentMap"), (int[1]){ 0 }, UNIFORM_INT);
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Texture2D texHDR = LoadTexture("resources/dresden_square.hdr");
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Texture2D cubemap = GenTextureCubemap(shdrCubemap, texHDR, CUBEMAP_SIZE);
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mat.maps[MAP_IRRADIANCE].texture = GenTextureIrradiance(shdrIrradiance, cubemap, IRRADIANCE_SIZE);
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mat.maps[MAP_PREFILTER].texture = GenTexturePrefilter(shdrPrefilter, cubemap, PREFILTERED_SIZE);
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mat.maps[MAP_BRDF].texture = GenTextureBRDF(shdrBRDF, BRDF_SIZE);
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UnloadTexture(cubemap);
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UnloadTexture(texHDR);
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// Unload already used shaders (to create specific textures)
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UnloadShader(shdrCubemap);
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UnloadShader(shdrIrradiance);
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UnloadShader(shdrPrefilter);
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UnloadShader(shdrBRDF);
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// Set textures filtering for better quality
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SetTextureFilter(mat.maps[MAP_ALBEDO].texture, FILTER_BILINEAR);
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SetTextureFilter(mat.maps[MAP_NORMAL].texture, FILTER_BILINEAR);
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SetTextureFilter(mat.maps[MAP_METALNESS].texture, FILTER_BILINEAR);
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SetTextureFilter(mat.maps[MAP_ROUGHNESS].texture, FILTER_BILINEAR);
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SetTextureFilter(mat.maps[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 }, UNIFORM_INT);
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SetShaderValue(mat.shader, GetShaderLocation(mat.shader, "normals.useSampler"), (int[1]){ 1 }, UNIFORM_INT);
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SetShaderValue(mat.shader, GetShaderLocation(mat.shader, "metalness.useSampler"), (int[1]){ 1 }, UNIFORM_INT);
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SetShaderValue(mat.shader, GetShaderLocation(mat.shader, "roughness.useSampler"), (int[1]){ 1 }, UNIFORM_INT);
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SetShaderValue(mat.shader, GetShaderLocation(mat.shader, "occlusion.useSampler"), (int[1]){ 1 }, UNIFORM_INT);
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int renderModeLoc = GetShaderLocation(mat.shader, "renderMode");
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SetShaderValue(mat.shader, renderModeLoc, (int[1]){ 0 }, UNIFORM_INT);
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// Set up material properties color
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mat.maps[MAP_ALBEDO].color = albedo;
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mat.maps[MAP_NORMAL].color = (Color){ 128, 128, 255, 255 };
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mat.maps[MAP_METALNESS].value = metalness;
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mat.maps[MAP_ROUGHNESS].value = roughness;
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mat.maps[MAP_OCCLUSION].value = 1.0f;
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mat.maps[MAP_EMISSION].value = 0.5f;
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mat.maps[MAP_HEIGHT].value = 0.5f;
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return mat;
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}
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