mirror of
https://github.com/gnif/LookingGlass.git
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113 lines
3.2 KiB
C++
113 lines
3.2 KiB
C++
/**
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* Looking Glass
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* Copyright © 2017-2026 The Looking Glass Authors
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* https://looking-glass.io
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc., 59
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* Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "transport/lgmp/CLGMPFrameCaps.h"
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#include <d3d12.h>
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#include <limits>
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namespace
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{
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static const uint64_t FRAME_BYTES_PER_PIXEL = 4;
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bool AlignUp(uint64_t value, uint64_t alignment, uint64_t& result)
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{
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if (!alignment || (alignment & (alignment - 1)))
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return false;
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const uint64_t mask = alignment - 1;
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if (value > (std::numeric_limits<uint64_t>::max)() - mask)
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return false;
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result = (value + mask) & ~mask;
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return true;
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}
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bool CalculateFrameSize(
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const FrameMode& mode, uint64_t& frameSize)
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{
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frameSize = 0;
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if (!mode.width || !mode.height || !mode.refreshMilliHz)
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return false;
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uint64_t pitch;
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if (!AlignUp((uint64_t)mode.width * FRAME_BYTES_PER_PIXEL,
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D3D12_TEXTURE_DATA_PITCH_ALIGNMENT, pitch) ||
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pitch > (std::numeric_limits<uint64_t>::max)() / mode.height)
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return false;
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frameSize = pitch * mode.height;
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return true;
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}
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uint32_t RecommendedSizeMiB(uint64_t requiredSize)
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{
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uint64_t sizeMiB = requiredSize / 1048576;
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if (requiredSize % 1048576)
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++sizeMiB;
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uint64_t result = 1;
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while (result < sizeMiB && result <= UINT32_MAX / 2)
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result <<= 1;
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return result < sizeMiB ? UINT32_MAX : (uint32_t)result;
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}
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}
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CLGMPFrameCaps::CLGMPFrameCaps(uint64_t capacity,
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uint64_t frameMemoryOffset, uint32_t bufferCount) :
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m_capacity(capacity),
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m_frameMemoryOffset(frameMemoryOffset),
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m_bufferCount(bufferCount)
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{
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}
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bool CLGMPFrameCaps::CanUseMode(const FrameMode& mode,
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uint32_t * requiredSizeMiB) const
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{
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if (requiredSizeMiB)
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*requiredSizeMiB = 0;
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const uint64_t alignment =
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D3D12_DEFAULT_RESOURCE_PLACEMENT_ALIGNMENT;
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uint64_t frameSize;
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if (!m_frameMemoryOffset || !m_bufferCount ||
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!CalculateFrameSize(mode, frameSize) ||
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frameSize > (std::numeric_limits<uint64_t>::max)() - alignment)
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return false;
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uint64_t frameAllocationSize;
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uint64_t frameMemoryStart;
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if (!AlignUp(frameSize + alignment, alignment,
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frameAllocationSize) ||
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!AlignUp(m_frameMemoryOffset, alignment, frameMemoryStart) ||
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frameAllocationSize >
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((std::numeric_limits<uint64_t>::max)() - frameMemoryStart) /
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m_bufferCount)
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return false;
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const uint64_t requiredSize = frameMemoryStart +
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frameAllocationSize * m_bufferCount;
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if (requiredSize <= m_capacity)
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return true;
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if (requiredSizeMiB)
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*requiredSizeMiB = RecommendedSizeMiB(requiredSize);
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return false;
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}
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