/** 
 * @file llcubemap.h
 * @brief LLCubeMap class definition
 *
 * $LicenseInfo:firstyear=2002&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#ifndef LL_LLCUBEMAP_H
#define LL_LLCUBEMAP_H

#include "llgl.h"

#include <vector>

class LLVector3;

// Environment map hack!
class LLCubeMap : public LLRefCount
{
	bool mIssRGB;
public:
	LLCubeMap(bool init_as_srgb);
	void init(const std::vector<LLPointer<LLImageRaw> >& rawimages);

    // initialize as an undefined cubemap at the given resolution
    //  used for render-to-cubemap operations
    //  avoids usage of LLImageRaw
    void initReflectionMap(U32 resolution, U32 components = 3);

    // init from environment map images
    // Similar to init, but takes ownership of rawimages and makes this cubemap
    // respect the resolution of rawimages
    // Raw images must point to array of six square images that are all the same resolution
    void initEnvironmentMap(const std::vector<LLPointer<LLImageRaw> >& rawimages);
	void initGL();
	void initRawData(const std::vector<LLPointer<LLImageRaw> >& rawimages);
	void initGLData();

	void bind();
	void enable(S32 stage);
	
	void enableTexture(S32 stage);
	S32	 getStage(void) { return mTextureStage; }
	
	void disable(void);
	void disableTexture(void);
	void setMatrix(S32 stage);
	void restoreMatrix();

    U32 getResolution() { return mImages[0].notNull() ? mImages[0]->getWidth(0) : 0; }
    
    // generate mip maps for this Cube Map using GL
    // NOTE: Cube Map MUST already be resident in VRAM
    void generateMipMaps();

	GLuint getGLName();

	void destroyGL();

public:
	static bool sUseCubeMaps;

protected:
	friend class LLTexUnit;
	~LLCubeMap() = default;
	LLGLenum mTargets[6];
	LLPointer<LLImageGL> mImages[6];
	LLPointer<LLImageRaw> mRawImages[6];
	S32 mTextureStage;
	S32 mMatrixStage;
};

#endif
