demotool/rendertarget.hh

#pragma once
#ifndef REAL_BUILD
# include "externals.hh"
#endif

#include "texture.hh"


struct T_Rendertarget;


struct T_RendertargetSetup
{
	T_RendertargetSetup( );

	T_RendertargetSetup& add(
			__rw__ T_Texture& texture ,
			__rd__ const uint32_t level = 0 );
	T_RendertargetSetup& depth(
			__rw__ T_Texture& texture );

	T_Rendertarget create( );

    private:
	struct T_Attachment_ {
		T_Texture* texture;
		uint32_t level;

		T_Attachment_(
				__rw__ T_Texture& texture ,
				__rd__ const uint32_t level )
			: texture( &texture ) , level( level )
		{}
	};

	void checkAttachment(
			__rw__ T_Texture const& texture ,
			__rd__ const uint32_t level );

	bool hasAttachments_;
	uint32_t width_ , height_;
	std::vector< T_Attachment_ > colorAttachments_;
	std::unique_ptr< T_Attachment_ > depthAttachment_;
};


struct T_Rendertarget
{
	T_Rendertarget( ) = delete;
	T_Rendertarget( T_Rendertarget const& ) = delete;

	T_Rendertarget(
			__rd__ const GLuint id ,
			__rd__ const uint32_t nCats ,
			__rd__ const uint32_t width ,
			__rd__ const uint32_t height );

	T_Rendertarget( __rw__ T_Rendertarget&& other ) noexcept;
	T_Rendertarget& operator =(
			__rw__ T_Rendertarget&& ) noexcept;

	~T_Rendertarget( );

	bool activate( );

	uint32_t width( ) const { return width_; }
	uint32_t height( ) const { return height_; }

	static void MainOutput( );

    private:
	GLuint id_;
	uint32_t nCats_ , width_ , height_;
	std::vector< GLenum > buffers_;
};