/*
 Copyright (c) 2013 yvt
 
 This file is part of OpenSpades.
 
 OpenSpades is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.
 
 OpenSpades is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
 along with OpenSpades.  If not, see <http://www.gnu.org/licenses/>.
 
 */

#pragma once

#include "IGLDevice.h"

namespace spades {
	namespace draw {
		class GLFramebufferManager {
		public:
			class BufferHandle {
				GLFramebufferManager *manager;
				size_t bufferIndex;
				bool valid;
			public:
				BufferHandle();
				BufferHandle(GLFramebufferManager *manager, size_t index);
				BufferHandle(const BufferHandle&);
				~BufferHandle();
				
				void operator =(const BufferHandle&);
				
				bool IsValid()const{return valid;}
				void Release();
				IGLDevice::UInteger GetFramebuffer();
				IGLDevice::UInteger GetTexture();
				int GetWidth();
				int GetHeight();
				
				IGLDevice::Enum GetInternalFormat();
				
				GLFramebufferManager *GetManager() {
					return manager;
				}
			};
		private:
			IGLDevice *device;
			
			struct Buffer {
				IGLDevice::UInteger framebuffer;
				IGLDevice::UInteger texture;
				int refCount;
				int w, h;
				IGLDevice::Enum internalFormat;
			};
			
			bool useMultisample;
			bool useHighPrec;
			
			IGLDevice::UInteger multisampledFramebuffer;
			
			// for multisample
			IGLDevice::UInteger multisampledColorRenderbuffer;
			IGLDevice::UInteger multisampledDepthRenderbuffer;
			
			// common
			IGLDevice::UInteger renderFramebuffer;
			IGLDevice::UInteger renderColorTexture;
			IGLDevice::UInteger renderDepthTexture;
			
			IGLDevice::Enum fbInternalFormat;
			
			IGLDevice::UInteger mirrorFramebuffer;
			IGLDevice::UInteger mirrorColorTexture;
			
			std::vector<Buffer> buffers;
			
		public:
			GLFramebufferManager(IGLDevice *);
			~GLFramebufferManager();
			
			/** setups device for scene rendering. */
			void PrepareSceneRendering();
			
			BufferHandle PrepareForWaterRendering(IGLDevice::UInteger tempFb,
												  IGLDevice::UInteger tempDepthTex);
			BufferHandle StartPostProcessing();
			
			void MakeSureAllBuffersReleased();
			
			IGLDevice::UInteger GetDepthTexture(){
				return renderDepthTexture;
			}
			BufferHandle CreateBufferHandle(int w=-1, int h=-1, bool alpha=false);
			BufferHandle CreateBufferHandle(int w, int h, IGLDevice::Enum internalFormat);
			
			void CopyToMirrorTexture(IGLDevice::UInteger fb = 0);
			void ClearMirrorTexture(Vector3);
			IGLDevice::UInteger GetMirrorTexture(){
				return mirrorColorTexture;
			}
		};
		
		
		// name is too long, so shorten it!
		typedef GLFramebufferManager::BufferHandle GLColorBuffer;
	}
}