Shader.h

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#pragma once
 
#include "Core.h"
#include <SDL3/SDL_gpu.h>
#include <string>
 
namespace candlewick {
 
constexpr const char *g_default_shader_dir = CANDLEWICK_SHADER_BIN_DIR;

void setShadersDirectory(const char *path);
const char *currentShaderDirectory();
 
const char *shader_format_name(SDL_GPUShaderFormat shader_format);

struct Shader {
  struct Config {
    SDL_GPUShaderStage stage;
    std::string entry_point;
    Uint32 uniform_buffers;
    Uint32 samplers;
    Uint32 storage_textures = 0;
    Uint32 storage_buffers = 0;
  };

  Shader(const Device &device, const char *filename, const Config &config);
  Shader(const Shader &) = delete;
  Shader(Shader &&other) noexcept;
 
  operator SDL_GPUShader *() const noexcept { return _shader; }
  void release() noexcept;
  ~Shader() noexcept { release(); }

  static Shader fromMetadata(const Device &device, const char *filename);
 
  SDL_GPUShaderStage stage() const noexcept { return _stage; }
 
private:
  SDL_GPUShader *_shader;
  SDL_GPUDevice *_device;
  SDL_GPUShaderStage _stage;
};
 
inline Shader::Shader(Shader &&other) noexcept
    : _shader(other._shader), _device(other._device) {
  other._shader = nullptr;
  other._device = nullptr;
}

Shader::Config loadShaderMetadata(const char *shader_name);
 
inline Shader Shader::fromMetadata(const Device &device,
                                   const char *shader_name) {
  auto config = loadShaderMetadata(shader_name);
  return Shader{device, shader_name, config};
}
 
} // namespace candlewick