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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
*/
#include <memory>
#include <sal/config.h>
#include <vcl/opengl/OpenGLContext.hxx>
#include <vcl/opengl/OpenGLHelper.hxx>
#include <opengl/framebuffer.hxx>
#include <opengl/texture.hxx>
#include <opengl/FixedTextureAtlas.hxx>
struct FixedTexture
{
std::shared_ptr<ImplOpenGLTexture> mpTexture;
int mnFreeSlots;
std::vector<bool> maAllocatedSlots;
FixedTexture(int nTextureWidth, int nTextureHeight, int nNumberOfSlots)
: mpTexture(new ImplOpenGLTexture(nTextureWidth, nTextureHeight, true))
, mnFreeSlots(nNumberOfSlots)
, maAllocatedSlots(nNumberOfSlots, false)
{
auto aDeallocateFunction = [this] (int nSlotNumber)
{
deallocateSlot(nSlotNumber);
};
mpTexture->SetSlotDeallocateCallback(aDeallocateFunction);
mpTexture->InitializeSlotMechanism(nNumberOfSlots);
}
~FixedTexture()
{
mpTexture->ResetSlotDeallocateCallback();
}
void allocateSlot(int nSlot)
{
maAllocatedSlots[nSlot] = true;
mnFreeSlots--;
}
void deallocateSlot(int nSlot)
{
maAllocatedSlots[nSlot] = false;
mnFreeSlots++;
}
int findAndAllocateFreeSlot()
{
for (size_t i = 0; i < maAllocatedSlots.size(); ++i)
{
if (!maAllocatedSlots[i])
{
allocateSlot(i);
return i;
}
}
return -1;
}
private:
FixedTexture(const FixedTexture&) = delete;
FixedTexture& operator=(const FixedTexture&) = delete;
};
FixedTextureAtlasManager::FixedTextureAtlasManager(int nWidthFactor, int nHeightFactor, int nSubTextureSize)
: mWidthFactor(nWidthFactor)
, mHeightFactor(nHeightFactor)
, mSubTextureSize(nSubTextureSize)
{
}
FixedTextureAtlasManager::~FixedTextureAtlasManager()
{
}
void FixedTextureAtlasManager::CreateNewTexture()
{
int nTextureWidth = mWidthFactor * mSubTextureSize;
int nTextureHeight = mHeightFactor * mSubTextureSize;
maFixedTextures.push_back(std::make_unique<FixedTexture>(nTextureWidth, nTextureHeight, mWidthFactor * mHeightFactor));
}
OpenGLTexture FixedTextureAtlasManager::Reserve(int nWidth, int nHeight)
{
FixedTexture* pFixedTexture = nullptr;
auto funFreeSlot = [] (std::unique_ptr<FixedTexture>& inFixedTexture)
{
return inFixedTexture->mnFreeSlots > 0;
};
auto it = std::find_if(maFixedTextures.begin(), maFixedTextures.end(), funFreeSlot);
if (it != maFixedTextures.end())
{
pFixedTexture = (*it).get();
}
else
{
CreateNewTexture();
pFixedTexture = maFixedTextures.back().get();
}
int nSlot = pFixedTexture->findAndAllocateFreeSlot();
// Calculate coordinates in texture
int nX = (nSlot % mWidthFactor) * mSubTextureSize;
int nY = (nSlot / mWidthFactor) * mSubTextureSize;
tools::Rectangle aRectangle(Point(nX, nY), Size(nWidth, nHeight));
return OpenGLTexture(pFixedTexture->mpTexture, aRectangle, nSlot);
}
OpenGLTexture FixedTextureAtlasManager::InsertBuffer(int nWidth, int nHeight, int nFormat, int nType, sal_uInt8 const * pData)
{
OpenGLTexture aTexture = Reserve(nWidth, nHeight);
if (pData == nullptr)
return aTexture;
aTexture.CopyData(nWidth, nHeight, nFormat, nType, pData);
return aTexture;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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