212 lines
11 KiB
C
212 lines
11 KiB
C
/*******************************************************************************************
|
|
*
|
|
* raylib [models] example - PBR material
|
|
*
|
|
* This example has been created using raylib 1.8 (www.raylib.com)
|
|
* raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
|
|
*
|
|
* Copyright (c) 2017 Ramon Santamaria (@raysan5)
|
|
*
|
|
********************************************************************************************/
|
|
|
|
#include "raylib.h"
|
|
#include "raymath.h"
|
|
|
|
#include <stdio.h>
|
|
|
|
#define RLIGHTS_IMPLEMENTATION
|
|
#include "rlights.h"
|
|
|
|
#define CUBEMAP_SIZE 512 // Cubemap texture size
|
|
#define IRRADIANCE_SIZE 32 // Irradiance texture size
|
|
#define PREFILTERED_SIZE 256 // Prefiltered HDR environment texture size
|
|
#define BRDF_SIZE 512 // BRDF LUT texture size
|
|
|
|
// PBR material loading
|
|
static Material LoadMaterialPBR(Color albedo, float metalness, float roughness);
|
|
|
|
int main()
|
|
{
|
|
// Initialization
|
|
//--------------------------------------------------------------------------------------
|
|
int screenWidth = 800;
|
|
int screenHeight = 450;
|
|
|
|
SetConfigFlags(FLAG_MSAA_4X_HINT); // Enable Multi Sampling Anti Aliasing 4x (if available)
|
|
InitWindow(screenWidth, screenHeight, "raylib [models] example - pbr material");
|
|
|
|
// Define the camera to look into our 3d world
|
|
Camera camera = { 0 };
|
|
camera.position = (Vector3){ 4.0f, 4.0f, 4.0f }; // Camera position
|
|
camera.target = (Vector3){ 0.0f, 0.5f, 0.0f }; // Camera looking at point
|
|
camera.up = (Vector3){ 0.0f, 1.0f, 0.0f }; // Camera up vector (rotation towards target)
|
|
camera.fovy = 45.0f; // Camera field-of-view Y
|
|
camera.type = CAMERA_PERSPECTIVE; // Camera mode type
|
|
|
|
// Load model and PBR material
|
|
Model model = LoadModel("resources/pbr/trooper.obj");
|
|
|
|
// Mesh tangents are generated... and uploaded to GPU
|
|
// NOTE: New VBO for tangents is generated at default location and also binded to mesh VAO
|
|
MeshTangents(&model.meshes[0]);
|
|
|
|
model.materials[0] = LoadMaterialPBR((Color){ 255, 255, 255, 255 }, 1.0f, 1.0f);
|
|
|
|
// Define lights attributes
|
|
// NOTE: Shader is passed to every light on creation to define shader bindings internally
|
|
Light lights[MAX_LIGHTS] = {
|
|
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),
|
|
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),
|
|
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),
|
|
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)
|
|
};
|
|
|
|
SetCameraMode(camera, CAMERA_ORBITAL); // Set an orbital camera mode
|
|
|
|
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); // Update camera
|
|
|
|
// Send to material PBR shader camera view position
|
|
float cameraPos[3] = { camera.position.x, camera.position.y, camera.position.z };
|
|
SetShaderValue(model.materials[0].shader, model.materials[0].shader.locs[LOC_VECTOR_VIEW], cameraPos, UNIFORM_VEC3);
|
|
//----------------------------------------------------------------------------------
|
|
|
|
// Draw
|
|
//----------------------------------------------------------------------------------
|
|
BeginDrawing();
|
|
|
|
ClearBackground(RAYWHITE);
|
|
|
|
BeginMode3D(camera);
|
|
|
|
DrawModel(model, Vector3Zero(), 1.0f, WHITE);
|
|
|
|
DrawGrid(10, 1.0f);
|
|
|
|
EndMode3D();
|
|
|
|
DrawFPS(10, 10);
|
|
|
|
EndDrawing();
|
|
//----------------------------------------------------------------------------------
|
|
}
|
|
|
|
// De-Initialization
|
|
//--------------------------------------------------------------------------------------
|
|
UnloadModel(model); // Unload skybox model
|
|
|
|
CloseWindow(); // Close window and OpenGL context
|
|
//--------------------------------------------------------------------------------------
|
|
|
|
return 0;
|
|
}
|
|
|
|
// Load PBR material (Supports: ALBEDO, NORMAL, METALNESS, ROUGHNESS, AO, EMMISIVE, HEIGHT maps)
|
|
// NOTE: PBR shader is loaded inside this function
|
|
static Material LoadMaterialPBR(Color albedo, float metalness, float roughness)
|
|
{
|
|
Material mat = { 0 }; // NOTE: All maps textures are set to { 0 }
|
|
|
|
#define PATH_PBR_VS "resources/shaders/pbr.vs" // Path to physically based rendering vertex shader
|
|
#define PATH_PBR_FS "resources/shaders/pbr.fs" // Path to physically based rendering fragment shader
|
|
|
|
mat.shader = LoadShader(PATH_PBR_VS, PATH_PBR_FS);
|
|
|
|
// Get required locations points for PBR material
|
|
// NOTE: Those location names must be available and used in the shader code
|
|
mat.shader.locs[LOC_MAP_ALBEDO] = GetShaderLocation(mat.shader, "albedo.sampler");
|
|
mat.shader.locs[LOC_MAP_METALNESS] = GetShaderLocation(mat.shader, "metalness.sampler");
|
|
mat.shader.locs[LOC_MAP_NORMAL] = GetShaderLocation(mat.shader, "normals.sampler");
|
|
mat.shader.locs[LOC_MAP_ROUGHNESS] = GetShaderLocation(mat.shader, "roughness.sampler");
|
|
mat.shader.locs[LOC_MAP_OCCLUSION] = GetShaderLocation(mat.shader, "occlusion.sampler");
|
|
//mat.shader.locs[LOC_MAP_EMISSION] = GetShaderLocation(mat.shader, "emission.sampler");
|
|
//mat.shader.locs[LOC_MAP_HEIGHT] = GetShaderLocation(mat.shader, "height.sampler");
|
|
mat.shader.locs[LOC_MAP_IRRADIANCE] = GetShaderLocation(mat.shader, "irradianceMap");
|
|
mat.shader.locs[LOC_MAP_PREFILTER] = GetShaderLocation(mat.shader, "prefilterMap");
|
|
mat.shader.locs[LOC_MAP_BRDF] = GetShaderLocation(mat.shader, "brdfLUT");
|
|
|
|
// Set view matrix location
|
|
mat.shader.locs[LOC_MATRIX_MODEL] = GetShaderLocation(mat.shader, "matModel");
|
|
mat.shader.locs[LOC_MATRIX_VIEW] = GetShaderLocation(mat.shader, "view");
|
|
mat.shader.locs[LOC_VECTOR_VIEW] = GetShaderLocation(mat.shader, "viewPos");
|
|
|
|
// Set PBR standard maps
|
|
mat.maps[MAP_ALBEDO].texture = LoadTexture("resources/pbr/trooper_albedo.png");
|
|
mat.maps[MAP_NORMAL].texture = LoadTexture("resources/pbr/trooper_normals.png");
|
|
mat.maps[MAP_METALNESS].texture = LoadTexture("resources/pbr/trooper_metalness.png");
|
|
mat.maps[MAP_ROUGHNESS].texture = LoadTexture("resources/pbr/trooper_roughness.png");
|
|
mat.maps[MAP_OCCLUSION].texture = LoadTexture("resources/pbr/trooper_ao.png");
|
|
|
|
// Set environment maps
|
|
#define PATH_CUBEMAP_VS "resources/shaders/cubemap.vs" // Path to equirectangular to cubemap vertex shader
|
|
#define PATH_CUBEMAP_FS "resources/shaders/cubemap.fs" // Path to equirectangular to cubemap fragment shader
|
|
#define PATH_SKYBOX_VS "resources/shaders/skybox.vs" // Path to skybox vertex shader
|
|
#define PATH_IRRADIANCE_FS "resources/shaders/irradiance.fs" // Path to irradiance (GI) calculation fragment shader
|
|
#define PATH_PREFILTER_FS "resources/shaders/prefilter.fs" // Path to reflection prefilter calculation fragment shader
|
|
#define PATH_BRDF_VS "resources/shaders/brdf.vs" // Path to bidirectional reflectance distribution function vertex shader
|
|
#define PATH_BRDF_FS "resources/shaders/brdf.fs" // Path to bidirectional reflectance distribution function fragment shader
|
|
|
|
Shader shdrCubemap = LoadShader(PATH_CUBEMAP_VS, PATH_CUBEMAP_FS);
|
|
printf("Loaded shader: cubemap\n");
|
|
Shader shdrIrradiance = LoadShader(PATH_SKYBOX_VS, PATH_IRRADIANCE_FS);
|
|
printf("Loaded shader: irradiance\n");
|
|
Shader shdrPrefilter = LoadShader(PATH_SKYBOX_VS, PATH_PREFILTER_FS);
|
|
printf("Loaded shader: prefilter\n");
|
|
Shader shdrBRDF = LoadShader(PATH_BRDF_VS, PATH_BRDF_FS);
|
|
printf("Loaded shader: brdf\n");
|
|
|
|
// Setup required shader locations
|
|
SetShaderValue(shdrCubemap, GetShaderLocation(shdrCubemap, "equirectangularMap"), (int[1]){ 0 }, UNIFORM_INT);
|
|
SetShaderValue(shdrIrradiance, GetShaderLocation(shdrIrradiance, "environmentMap"), (int[1]){ 0 }, UNIFORM_INT);
|
|
SetShaderValue(shdrPrefilter, GetShaderLocation(shdrPrefilter, "environmentMap"), (int[1]){ 0 }, UNIFORM_INT);
|
|
|
|
Texture2D texHDR = LoadTexture("resources/dresden_square.hdr");
|
|
Texture2D cubemap = GenTextureCubemap(shdrCubemap, texHDR, CUBEMAP_SIZE);
|
|
mat.maps[MAP_IRRADIANCE].texture = GenTextureIrradiance(shdrIrradiance, cubemap, IRRADIANCE_SIZE);
|
|
mat.maps[MAP_PREFILTER].texture = GenTexturePrefilter(shdrPrefilter, cubemap, PREFILTERED_SIZE);
|
|
mat.maps[MAP_BRDF].texture = GenTextureBRDF(shdrBRDF, BRDF_SIZE);
|
|
UnloadTexture(cubemap);
|
|
UnloadTexture(texHDR);
|
|
|
|
// Unload already used shaders (to create specific textures)
|
|
UnloadShader(shdrCubemap);
|
|
UnloadShader(shdrIrradiance);
|
|
UnloadShader(shdrPrefilter);
|
|
UnloadShader(shdrBRDF);
|
|
|
|
// Set textures filtering for better quality
|
|
SetTextureFilter(mat.maps[MAP_ALBEDO].texture, FILTER_BILINEAR);
|
|
SetTextureFilter(mat.maps[MAP_NORMAL].texture, FILTER_BILINEAR);
|
|
SetTextureFilter(mat.maps[MAP_METALNESS].texture, FILTER_BILINEAR);
|
|
SetTextureFilter(mat.maps[MAP_ROUGHNESS].texture, FILTER_BILINEAR);
|
|
SetTextureFilter(mat.maps[MAP_OCCLUSION].texture, FILTER_BILINEAR);
|
|
|
|
// Enable sample usage in shader for assigned textures
|
|
SetShaderValue(mat.shader, GetShaderLocation(mat.shader, "albedo.useSampler"), (int[1]){ 1 }, UNIFORM_INT);
|
|
SetShaderValue(mat.shader, GetShaderLocation(mat.shader, "normals.useSampler"), (int[1]){ 1 }, UNIFORM_INT);
|
|
SetShaderValue(mat.shader, GetShaderLocation(mat.shader, "metalness.useSampler"), (int[1]){ 1 }, UNIFORM_INT);
|
|
SetShaderValue(mat.shader, GetShaderLocation(mat.shader, "roughness.useSampler"), (int[1]){ 1 }, UNIFORM_INT);
|
|
SetShaderValue(mat.shader, GetShaderLocation(mat.shader, "occlusion.useSampler"), (int[1]){ 1 }, UNIFORM_INT);
|
|
|
|
int renderModeLoc = GetShaderLocation(mat.shader, "renderMode");
|
|
SetShaderValue(mat.shader, renderModeLoc, (int[1]){ 0 }, UNIFORM_INT);
|
|
|
|
// Set up material properties color
|
|
mat.maps[MAP_ALBEDO].color = albedo;
|
|
mat.maps[MAP_NORMAL].color = (Color){ 128, 128, 255, 255 };
|
|
mat.maps[MAP_METALNESS].value = metalness;
|
|
mat.maps[MAP_ROUGHNESS].value = roughness;
|
|
mat.maps[MAP_OCCLUSION].value = 1.0f;
|
|
mat.maps[MAP_EMISSION].value = 0.5f;
|
|
mat.maps[MAP_HEIGHT].value = 0.5f;
|
|
|
|
return mat;
|
|
}
|