using Raylib;
using static Raylib.rl;
public partial class Examples
{
/*******************************************************************************************
*
* 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 "raymath.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);
public static int models_material_pbr()
{
// 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 = {{ 4.0f, 4.0f, 4.0f }, { 0.0f, 0.5f, 0.0f }, { 0.0f, 1.0f, 0.0f }, 45.0f, 0 };
// Load model and PBR material
Model model = LoadModel("resources/pbr/trooper.obj");
MeshTangents(&model.mesh);
model.material = 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.material.shader),
CreateLight(LIGHT_POINT, (Vector3){ 0.0f, LIGHT_HEIGHT, LIGHT_DISTANCE }, (Vector3){ 0.0f, 0.0f, 0.0f }, (Color){ 0, 255, 0, 255 }, model.material.shader),
CreateLight(LIGHT_POINT, (Vector3){ -LIGHT_DISTANCE, LIGHT_HEIGHT, 0.0f }, (Vector3){ 0.0f, 0.0f, 0.0f }, (Color){ 0, 0, 255, 255 }, model.material.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.material.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.material.shader, model.material.shader.locs[LOC_VECTOR_VIEW], cameraPos, 3);
//----------------------------------------------------------------------------------
// 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);
Shader shdrIrradiance = LoadShader(PATH_SKYBOX_VS, PATH_IRRADIANCE_FS);
Shader shdrPrefilter = LoadShader(PATH_SKYBOX_VS, PATH_PREFILTER_FS);
Shader shdrBRDF = LoadShader(PATH_BRDF_VS, PATH_BRDF_FS);
// Setup required shader locations
SetShaderValuei(shdrCubemap, GetShaderLocation(shdrCubemap, "equirectangularMap"), (int[1]){ 0 }, 1);
SetShaderValuei(shdrIrradiance, GetShaderLocation(shdrIrradiance, "environmentMap"), (int[1]){ 0 }, 1);
SetShaderValuei(shdrPrefilter, GetShaderLocation(shdrPrefilter, "environmentMap"), (int[1]){ 0 }, 1);
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, cubemap, 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
SetShaderValuei(mat.shader, GetShaderLocation(mat.shader, "albedo.useSampler"), (int[1]){ 1 }, 1);
SetShaderValuei(mat.shader, GetShaderLocation(mat.shader, "normals.useSampler"), (int[1]){ 1 }, 1);
SetShaderValuei(mat.shader, GetShaderLocation(mat.shader, "metalness.useSampler"), (int[1]){ 1 }, 1);
SetShaderValuei(mat.shader, GetShaderLocation(mat.shader, "roughness.useSampler"), (int[1]){ 1 }, 1);
SetShaderValuei(mat.shader, GetShaderLocation(mat.shader, "occlusion.useSampler"), (int[1]){ 1 }, 1);
int renderModeLoc = GetShaderLocation(mat.shader, "renderMode");
SetShaderValuei(mat.shader, renderModeLoc, (int[1]){ 0 }, 1);
// 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;
}
}