shader.hpp

#ifndef TOPAZ_GPU_SHADER_HPP
#define TOPAZ_GPU_SHADER_HPP
#include "tz/core/handle.hpp"
#include "tz/core/error.hpp"
#include <string>
#include <expected>
#include <string_view>
#include <span>
 
 
namespace tz::gpu
{
    struct shader_tag_t{};
    using shader_handle = tz::handle<shader_tag_t>;
    std::expected<shader_handle, tz::error_code> create_graphics_shader(std::string_view vertex_source, std::string_view fragment_source);
    std::expected<shader_handle, tz::error_code> create_compute_shader(std::string_view compute_source);
    void destroy_shader(shader_handle);
}
 
#define TZ_MACROHACKERY_JOIN4(X, Y, Z, W) X##Y##Z##W
#define TZ_MACROHACKERY_STRINGIFY(X) TZ_MACROHACKERY_STRINGIFY2(X)    
#define TZ_MACROHACKERY_STRINGIFY2(X) #X
#if TOPAZ_VULKAN
#define TZ_MACROHACKERY_JOIN_SHADER(X, Y, Z) TZ_MACROHACKERY_JOIN4(X, Y, Z, _tzsl_spv)
//#elif TZ_OGL
//#define TZ_MACROHACKERY_JOIN_SHADER(X, Y, Z) TZ_MACROHACKERY_JOIN4(X, Y, Z, _tzsl_glsl)
#endif
#if TOPAZ_VULKAN
#define ImportedShaderHeader(shader_name, shader_type) TZ_MACROHACKERY_STRINGIFY2(shader_name.shader_type.tzsl.spv.hpp)
//#elif TZ_OGL
//#define ImportedShaderHeader(shader_name, shader_type) TZ_MACROHACKERY_STRINGIFY2(shader_name.shader_type.tzsl.glsl.hpp)
#else
#define ImportedShaderHeader
#endif
 
#define ImportedShaderSource(shader_name, shader_type) []()->std::string_view{std::span<const std::byte> shader_bin = std::as_bytes(std::span<const std::int8_t>(TZ_MACROHACKERY_JOIN_SHADER(shader_name, _, shader_type))); return std::string_view{reinterpret_cast<const char*>(shader_bin.data()), shader_bin.size_bytes()};}()
 
#endif // TOPAZ_GPU_SHADER_HPP