da64d198ec
Change-Id: Ia28e35ae5af4f601e9a586a3deffbcd61702b0ca Reviewed-on: https://gerrit.libreoffice.org/36896 Tested-by: Jenkins <ci@libreoffice.org> Reviewed-by: Chris Sherlock <chris.sherlock79@gmail.com>
140 lines
3.7 KiB
C++
140 lines
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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*/
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#include <memory>
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#include <sal/config.h>
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#include <vcl/opengl/OpenGLContext.hxx>
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#include <vcl/opengl/OpenGLHelper.hxx>
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#include "opengl/framebuffer.hxx"
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#include "opengl/texture.hxx"
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#include "opengl/FixedTextureAtlas.hxx"
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#include <o3tl/make_unique.hxx>
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struct FixedTexture
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{
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std::shared_ptr<ImplOpenGLTexture> mpTexture;
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int mnFreeSlots;
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std::vector<bool> maAllocatedSlots;
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FixedTexture(int nTextureWidth, int nTextureHeight, int nNumberOfSlots)
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: mpTexture(new ImplOpenGLTexture(nTextureWidth, nTextureHeight, true))
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, mnFreeSlots(nNumberOfSlots)
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, maAllocatedSlots(nNumberOfSlots, false)
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{
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auto aDeallocateFunction = [this] (int nSlotNumber)
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{
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deallocateSlot(nSlotNumber);
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};
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mpTexture->SetSlotDeallocateCallback(aDeallocateFunction);
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mpTexture->InitializeSlotMechanism(nNumberOfSlots);
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}
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~FixedTexture()
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{
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mpTexture->ResetSlotDeallocateCallback();
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}
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void allocateSlot(int nSlot)
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{
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maAllocatedSlots[nSlot] = true;
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mnFreeSlots--;
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}
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void deallocateSlot(int nSlot)
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{
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maAllocatedSlots[nSlot] = false;
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mnFreeSlots++;
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}
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int findAndAllocateFreeSlot()
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{
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for (size_t i = 0; i < maAllocatedSlots.size(); ++i)
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{
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if (!maAllocatedSlots[i])
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{
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allocateSlot(i);
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return i;
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}
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}
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return -1;
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}
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private:
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FixedTexture(const FixedTexture&) = delete;
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FixedTexture& operator=(const FixedTexture&) = delete;
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};
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FixedTextureAtlasManager::FixedTextureAtlasManager(int nWidthFactor, int nHeightFactor, int nSubTextureSize)
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: mWidthFactor(nWidthFactor)
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, mHeightFactor(nHeightFactor)
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, mSubTextureSize(nSubTextureSize)
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{
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}
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FixedTextureAtlasManager::~FixedTextureAtlasManager()
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{
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}
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void FixedTextureAtlasManager::CreateNewTexture()
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{
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int nTextureWidth = mWidthFactor * mSubTextureSize;
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int nTextureHeight = mHeightFactor * mSubTextureSize;
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maFixedTextures.push_back(o3tl::make_unique<FixedTexture>(nTextureWidth, nTextureHeight, mWidthFactor * mHeightFactor));
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}
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OpenGLTexture FixedTextureAtlasManager::Reserve(int nWidth, int nHeight)
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{
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FixedTexture* pFixedTexture = nullptr;
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auto funFreeSlot = [] (std::unique_ptr<FixedTexture>& inFixedTexture)
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{
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return inFixedTexture->mnFreeSlots > 0;
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};
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auto it = std::find_if(maFixedTextures.begin(), maFixedTextures.end(), funFreeSlot);
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if (it != maFixedTextures.end())
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{
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pFixedTexture = (*it).get();
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}
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else
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{
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CreateNewTexture();
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pFixedTexture = maFixedTextures.back().get();
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}
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int nSlot = pFixedTexture->findAndAllocateFreeSlot();
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// Calculate coordinates in texture
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int nX = (nSlot % mWidthFactor) * mSubTextureSize;
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int nY = (nSlot / mWidthFactor) * mSubTextureSize;
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tools::Rectangle aRectangle(Point(nX, nY), Size(nWidth, nHeight));
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return OpenGLTexture(pFixedTexture->mpTexture, aRectangle, nSlot);
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}
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OpenGLTexture FixedTextureAtlasManager::InsertBuffer(int nWidth, int nHeight, int nFormat, int nType, sal_uInt8* pData)
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{
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OpenGLTexture aTexture = Reserve(nWidth, nHeight);
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if (pData == nullptr)
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return aTexture;
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aTexture.CopyData(nWidth, nHeight, nFormat, nType, pData);
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return aTexture;
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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