demotool/rendertarget.hh

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

#include <ebcl/Arrays.hh>
#include "texture.hh"


struct T_Rendertarget;


struct T_RendertargetSetup
{
	T_RendertargetSetup( );

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

	T_Rendertarget create( );

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

		T_Attachment_(
				T_Texture& texture ,
				const uint32_t level )
			: texture( &texture ) , level( level )
		{}
	};
	using T_Attachments_  = ebcl::T_AutoArray< T_Attachment_ , 8 >;

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

	bool hasAttachments_;
	uint32_t width_ , height_;

	T_Attachments_ colorAttachments_;
	ebcl::T_Optional< T_Attachment_ > depthAttachment_;
};


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

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

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

	~T_Rendertarget( );

	void attach( T_Texture const& texture ,
			uint32_t lod ,
			uint32_t id );
	void toggle( uint32_t id , bool active );

	bool activate( );

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

	static void MainOutput( );

    private:
	GLuint id_;
	uint32_t nCats_ , width_ , height_;
	ebcl::T_AutoArray< GLenum , 8 > buffers_;
};