PbrMaterial.h

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#pragma once
 
#include "procgen/Params.h"
#include "procgen/texture/TextureRecipe.h"
 
#include <cstdint>
#include <functional>
#include <string>
#include <unordered_map>
#include <vector>
 
namespace eve::image {
class ImageData;
}
 
namespace eve::procgen {
 
struct PbrTextureSet {
    image::ImageData *albedo    = nullptr;  // RGBA8
    image::ImageData *normal    = nullptr;  // RGBA8 tangent-space normal
    image::ImageData *roughness = nullptr;  // RGBA8, grayscale 0=glossy 1=rough
    image::ImageData *metallic  = nullptr;  // RGBA8, grayscale 0=dielectric 1=metal
    image::ImageData *height    = nullptr;  // RGBA8, grayscale displacement
    image::ImageData *ao        = nullptr;  // RGBA8, grayscale ambient occlusion
 
    void destroy() {
        delete albedo;
        delete normal;
        delete roughness;
        delete metallic;
        delete height;
        delete ao;
        albedo = normal = roughness = metallic = height = ao = nullptr;
    }
};
 
using PbrRecipeFn = std::function<PbrTextureSet *(const Params &params, std::string &error)>;
 
class PbrRecipeRegistry {
public:
    static PbrRecipeRegistry &instance();
 
    void registerPbrRecipe(const std::string &id, PbrRecipeFn fn);
    bool has(const std::string &id) const;
    PbrTextureSet *generate(const std::string &id, const Params &params, std::string &error) const;
    std::vector<std::string> list() const;
 
    void registerPbrBuiltins();
 
private:
    PbrRecipeRegistry() = default;
    std::unordered_map<std::string, PbrRecipeFn> recipes_;
    bool builtinsRegistered_ = false;
};
 
PbrTextureSet *generatePbrSet(const TextureRecipeDef &def, const Params &params,
                              std::string &error);
 
image::ImageData *grayscaleImage(const std::vector<float> &values, int w, int h);
 
}  // namespace eve::procgen