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/**
* @file llreflectionmapmanager.h
* @brief LLReflectionMapManager class declaration
*
* $LicenseInfo:firstyear=2022&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2022, 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
* $/LicenseInfo$
*/
#pragma once
#include "llreflectionmap.h"
#include "llrendertarget.h"
#include "llcubemaparray.h"
class LLSpatialGroup;
// number of reflection probes to keep in vram
#define LL_REFLECTION_PROBE_COUNT 256
// reflection probe resolution
#define LL_REFLECTION_PROBE_RESOLUTION 256
class alignas(16) LLReflectionMapManager
{
LL_ALIGN_NEW
public:
// allocate an environment map of the given resolution
LLReflectionMapManager();
// maintain reflection probes
void update();
// drop a reflection probe at the specified position in agent space
void addProbe(const LLVector3& pos);
// add a probe for the given spatial group
LLReflectionMap* addProbe(LLSpatialGroup* group);
// Populate "maps" with the N most relevant Reflection Maps where N is no more than maps.size()
// If less than maps.size() ReflectionMaps are available, will assign trailing elements to nullptr.
// maps -- presized array of Reflection Map pointers
void getReflectionMaps(std::vector<LLReflectionMap*>& maps);
// called by LLSpatialGroup constructor
// If spatial group should receive a Reflection Probe, will create one for the specified spatial group
LLReflectionMap* registerSpatialGroup(LLSpatialGroup* group);
// force an update of all probes
void rebuild();
// called on region crossing to "shift" probes into new coordinate frame
void shift(const LLVector4a& offset);
private:
friend class LLPipeline;
// delete the probe with the given index in mProbes
void deleteProbe(U32 i);
// get a free cube index
// if no cube indices are free, free one starting from the back of the probe list
S32 allocateCubeIndex();
// update the neighbors of the given probe
void updateNeighbors(LLReflectionMap* probe);
void setUniforms();
// render target for cube snapshots
// used to generate mipmaps without doing a copy-to-texture
LLRenderTarget mRenderTarget;
std::vector<LLRenderTarget> mMipChain;
// storage for reflection probes
LLPointer<LLCubeMapArray> mTexture;
// array indicating if a particular cubemap is free
bool mCubeFree[LL_REFLECTION_PROBE_COUNT];
// start tracking the given spatial group
void trackGroup(LLSpatialGroup* group);
// perform an update on the currently updating Probe
void doProbeUpdate();
// list of active reflection maps
std::vector<LLPointer<LLReflectionMap> > mProbes;
// list of reflection maps to kill
std::vector<LLPointer<LLReflectionMap> > mKillList;
// list of reflection maps to create
std::vector<LLPointer<LLReflectionMap> > mCreateList;
// handle to UBO
U32 mUBO = 0;
// list of maps being used for rendering
std::vector<LLReflectionMap*> mReflectionMaps;
LLReflectionMap* mUpdatingProbe = nullptr;
U32 mUpdatingFace = 0;
};
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