gamecodebook/Chapter13/GBuffer.h

// ----------------------------------------------------------------
// From Game Programming in C++ by Sanjay Madhav
// Copyright (C) 2017 Sanjay Madhav. All rights reserved.
// 
// Released under the BSD License
// See LICENSE in root directory for full details.
// ----------------------------------------------------------------

#pragma once
#include <vector>

class GBuffer
{
public:
	// Different types of data stored in the G-buffer
	enum Type
	{
		EDiffuse = 0,
		ENormal,
		EWorldPos,
		NUM_GBUFFER_TEXTURES
	};

	GBuffer();
	~GBuffer();

	// Create/destroy the G-buffer
	bool Create(int width, int height);
	void Destroy();
	
	// Get the texture for a specific type of data
	class Texture* GetTexture(Type type);
	// Get the framebuffer object ID
	unsigned int GetBufferID() const { return mBufferID; }
	// Setup all the G-buffer textures for sampling
	void SetTexturesActive();
private:
	// Textures associated with G-buffer
	std::vector<class Texture*> mTextures;
	// Frame buffer object ID
	unsigned int mBufferID;
};