#pragma once

#include "dvc_config.h"
#include "shader/dvc_shader_interface.h"


template<bool WithNormal, bool WithUV>
class StandardVertexShader : public davinci::VertexShaderInterface
{
public:
	virtual const char* getName(void) const;
	virtual const davinci::VertexDesc& getOutputVertexDesc() const;
	virtual size_t getOutputVertexByteSize(void) const;
	virtual void prepare(const davinci::RenderPipe* pipe, SetInputAttributeFunc setInputAttributeFunc);
	virtual void process(size_t index, void* outputVertex, davinci::fVector3& vertexWorldPos);

private:
	const davinci::RenderPipe* m_pipe = nullptr;
	davinci::VertexDesc m_outputVertexDesc;

	using InputBufferMembers = decltype(std::tuple_cat(
		std::tuple<davinci::DeviceBufferAccessorConstPtr>(),
		std::conditional_t<WithNormal, std::tuple<davinci::DeviceBufferAccessorConstPtr>, std::tuple<>>{},
		std::conditional_t<WithUV, std::tuple<davinci::DeviceBufferAccessorConstPtr>, std::tuple<>>{}
	));
	InputBufferMembers m_inputAccessors;

	static constexpr int32_t iPOSITION() { return 0; };
	static constexpr int32_t iNORMAL() { return 1; };
	static constexpr int32_t iUV() { return WithNormal+1; };

	//davinci::DeviceBufferAccessorConstPtr& getPositionAccessor();
	//davinci::DeviceBufferAccessorConstPtr& getNormalAccessor();
	//davinci::DeviceBufferAccessorConstPtr& getUVAccessor();

public:
	StandardVertexShader();
	virtual ~StandardVertexShader();
};

#include "vs_standard.inc"