/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program 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.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

/*
 * Copyright (C) 2006-2010 - Frictional Games
 *
 * This file is part of HPL1 Engine.
 */

#ifndef HPL_VERTEXBUFFER_VBO_H
#define HPL_VERTEXBUFFER_VBO_H

#include "common/scummsys.h"
#include "hpl1/engine/graphics/VertexBuffer.h"
#include "hpl1/opengl.h"

#ifdef HPL1_USE_OPENGL

namespace hpl {

class cVertexBufferVBO : public iVertexBuffer {
public:
	cVertexBufferVBO(iLowLevelGraphics *apLowLevelGraphics, tVertexFlag aFlags,
					 eVertexBufferDrawType aDrawType, eVertexBufferUsageType aUsageType,
					 int alReserveVtxSize, int alReserveIdxSize);
	~cVertexBufferVBO();

	void AddVertex(tVertexFlag aType, const cVector3f &avVtx);
	void AddColor(tVertexFlag aType, const cColor &aColor);
	void AddIndex(unsigned int alIndex);

	bool Compile(tVertexCompileFlag aFlags);
	void UpdateData(tVertexFlag aTypes, bool abIndices);

	void CreateShadowDouble(bool abUpdateData);

	void Transform(const cMatrixf &mtxTransform);

	void Draw(eVertexBufferDrawType aDrawType = eVertexBufferDrawType_LastEnum);
	void DrawIndices(unsigned int *apIndices, int alCount,
					 eVertexBufferDrawType aDrawType = eVertexBufferDrawType_LastEnum);

	void Bind();
	void UnBind();

	iVertexBuffer *CreateCopy(eVertexBufferUsageType aUsageType);

	cBoundingVolume CreateBoundingVolume();

	int GetVertexNum();
	int GetIndexNum();

	float *GetArray(tVertexFlag aType);
	unsigned int *GetIndices();

	void ResizeArray(tVertexFlag aType, int alSize);
	void ResizeIndices(int alSize);

	// For debugging purposes
	cVector3f GetVector3(tVertexFlag aType, unsigned alIdx);
	cVector3f GetVector4(tVertexFlag aType, unsigned alIdx);
	cColor GetColor(tVertexFlag aType, unsigned alIdx);
	unsigned int GetIndex(tVertexFlag aType, unsigned alIdx);

private:
	int GetElementNum(tVertexFlag aFlag);

	void SetVertexStates(tVertexFlag aFlags);

	unsigned int mlElementHandle;

	tFloatVec mvVertexArray[klNumOfVertexFlags];

	unsigned int mvArrayHandle[klNumOfVertexFlags];

	tUIntVec mvIndexArray;

	bool mbHasShadowDouble;

	bool mbCompiled;
};

} // namespace hpl

#endif // HPL1_USE_OPENGL
#endif // HPL_RENDERER3D_VBO_H