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/**
* @file llvowlsky.h
* @brief LLVOWLSky class definition
*
* $LicenseInfo:firstyear=2007&license=viewerlgpl$
* 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_VOWLSKY_H
#define LL_VOWLSKY_H
#include "llviewerobject.h"
class LLVOWLSky : public LLStaticViewerObject {
private:
static const F32 DISTANCE_TO_STARS;
// anything less than 3 makes it impossible to create a closed dome.
static const U32 MIN_SKY_DETAIL;
// anything bigger than about 180 will cause getStripsNumVerts() to exceed 65535.
static const U32 MAX_SKY_DETAIL;
inline static U32 getNumStacks(void);
inline static U32 getNumSlices(void);
inline static U32 getFanNumVerts(void);
inline static U32 getFanNumIndices(void);
inline static U32 getStripsNumVerts(void);
inline static U32 getStripsNumIndices(void);
inline static U32 getStarsNumVerts(void);
inline static U32 getStarsNumIndices(void);
public:
LLVOWLSky(const LLUUID &id, const LLPCode pcode, LLViewerRegion *regionp);
void initSunDirection(LLVector3 const & sun_direction,
LLVector3 const & sun_angular_velocity);
/*virtual*/ BOOL idleUpdate(LLAgent &agent, LLWorld &world, const F64 &time);
/*virtual*/ BOOL isActive(void) const;
/*virtual*/ LLDrawable * createDrawable(LLPipeline *pipeline);
/*virtual*/ BOOL updateGeometry(LLDrawable *drawable);
void drawStars(void);
void drawDome(void);
void resetVertexBuffers(void);
void cleanupGL();
void restoreGL();
private:
// a tiny helper function for controlling the sky dome tesselation.
static F32 calcPhi(U32 i);
// helper function for initializing the stars.
void initStars();
// helper function for building the fan vertex buffer.
static void buildFanBuffer(LLStrider<LLVector3> & vertices,
LLStrider<LLVector2> & texCoords,
LLStrider<U16> & indices);
// helper function for building the strips vertex buffer.
// note begin_stack and end_stack follow stl iterator conventions,
// begin_stack is the first stack to be included, end_stack is the first
// stack not to be included.
static void buildStripsBuffer(U32 begin_stack, U32 end_stack,
LLStrider<LLVector3> & vertices,
LLStrider<LLVector2> & texCoords,
LLStrider<U16> & indices);
// helper function for updating the stars colors.
void updateStarColors();
// helper function for updating the stars geometry.
BOOL updateStarGeometry(LLDrawable *drawable);
private:
LLPointer<LLVertexBuffer> mFanVerts;
std::vector< LLPointer<LLVertexBuffer> > mStripsVerts;
LLPointer<LLVertexBuffer> mStarsVerts;
std::vector<LLVector3> mStarVertices; // Star verticies
std::vector<LLColor4> mStarColors; // Star colors
std::vector<F32> mStarIntensities; // Star intensities
};
#endif // LL_VOWLSKY_H
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