//================= Copyright kotofyt, All rights reserved ==================//
// Purpose: Shader compilers.
//
// We kinda need to store shader contents in blobs so they can be parsed easily
//
// For now we store them like this
//  ShaderHeader_t
//  ShaderLump_t[m_nNumLump]
//  ShaderObject_t[m_nNumShaders]
//  ~An actual shader data~
//===========================================================================//

#ifndef SHADER_INTERNALS_H
#define SHADER_INTERNALS_H

#include "stdint.h"

enum EShaderBackend: uint32_t
{
	SHADER_BACKEND_SPIRV_VULKAN,
	SHADER_BACKEND_CODE_METAL,
};

enum EShaderStage: uint32_t
{
	SHADER_STAGE_VERTEX,
	SHADER_STAGE_TESSELATION_CONTROL,
	SHADER_STAGE_TESSELATION_EVAL,
	SHADER_STAGE_GEOMETRY,
	SHADER_STAGE_PIXEL,
	
	SHADER_STAGE_COMPUTE,
	
	SHADER_STAGE_RAYGEN,
	SHADER_STAGE_ANY_HIT,
	SHADER_STAGE_CLOSEST_HIT,
	SHADER_STAGE_MISS,
	SHADER_STAGE_CALLABLE,

	SHADER_STAGE_RAYGEN_SOFTWARE,
	SHADER_STAGE_ANY_HIT_SOFTWARE,
	SHADER_STAGE_CLOSEST_HIT_SOFTWARE,
	SHADER_STAGE_MISS_SOFTWARE,
	SHADER_STAGE_CALLABLE_SOFTWARE,

	SHADER_STAGE_TASK,
	SHADER_STAGE_MESH,

	SHADER_STAGE_COMMON_DATA,

	SHADER_STAGE_MAX,
	SHADER_STAGE_COUNT = SHADER_STAGE_MAX
};

struct ShaderHeader_t
{
	char m_cSignature[4];
	uint32_t m_nNumLumps;
	uint32_t m_nNumShaders;
};

struct ShaderLump_t
{
	uint32_t m_nSize;
	uint32_t m_nOffset;
};

struct ShaderObject_t
{
	EShaderBackend m_eBackend;
	EShaderStage m_eStage;
	uint32_t m_nMetadataLump;
	uint32_t m_nDataLump;
};

#endif