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Save States: The GPU framebuffer downscaling code can now take a faster code path if available.

This commit is contained in:
rogerman 2018-10-27 16:28:00 -07:00
parent 0f9f86fe61
commit 4735079c9a
1 changed files with 75 additions and 2 deletions
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77
desmume/src/GPU.cpp
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@ -1183,6 +1183,79 @@ static FORCEINLINE void CopyLineReduce(void *__restrict dst, const void *__restr
#endif
}
template <s32 INTEGERSCALEHINT, bool USELINEINDEX, bool NEEDENDIANSWAP, size_t ELEMENTSIZE>
static void CopyLineReduceHinted(const void *__restrict srcBuffer, const size_t srcLineIndex, const size_t srcLineWidth,
void *__restrict dstBuffer, const size_t dstLineIndex)
{
switch (INTEGERSCALEHINT)
{
case 0:
{
const u8 *__restrict src = (USELINEINDEX) ? (u8 *)srcBuffer + (srcLineIndex * srcLineWidth * ELEMENTSIZE) : (u8 *)srcBuffer;
u8 *__restrict dst = (USELINEINDEX) ? (u8 *)dstBuffer + (srcLineIndex * srcLineWidth * ELEMENTSIZE) : (u8 *)dstBuffer;
CopyLineReduce<INTEGERSCALEHINT, NEEDENDIANSWAP, ELEMENTSIZE>(dst, src, srcLineWidth);
break;
}
case 1:
{
const u8 *__restrict src = (USELINEINDEX) ? (u8 *)srcBuffer + (dstLineIndex * GPU_FRAMEBUFFER_NATIVE_WIDTH * ELEMENTSIZE) : (u8 *)srcBuffer;
u8 *__restrict dst = (USELINEINDEX) ? (u8 *)dstBuffer + (dstLineIndex * GPU_FRAMEBUFFER_NATIVE_WIDTH * ELEMENTSIZE) : (u8 *)dstBuffer;
CopyLineReduce<INTEGERSCALEHINT, NEEDENDIANSWAP, ELEMENTSIZE>(dst, src, GPU_FRAMEBUFFER_NATIVE_WIDTH);
break;
}
default:
{
const u8 *__restrict src = (USELINEINDEX) ? (u8 *)srcBuffer + (srcLineIndex * srcLineWidth * ELEMENTSIZE) : (u8 *)srcBuffer;
u8 *__restrict dst = (USELINEINDEX) ? (u8 *)dstBuffer + (dstLineIndex * GPU_FRAMEBUFFER_NATIVE_WIDTH * ELEMENTSIZE) : (u8 *)dstBuffer;
// TODO: Determine INTEGERSCALEHINT earlier in the pipeline, preferably when the framebuffer is first initialized.
//
// The implementation below is a stopgap measure for getting the faster code paths to run.
// However, this setup is not ideal, since the code size will greatly increase in order to
// include all possible code paths, possibly causing cache misses on lesser CPUs.
switch (srcLineWidth)
{
case (GPU_FRAMEBUFFER_NATIVE_WIDTH * 2):
CopyLineReduce<2, NEEDENDIANSWAP, ELEMENTSIZE>(dst, src, GPU_FRAMEBUFFER_NATIVE_WIDTH * 2);
break;
case (GPU_FRAMEBUFFER_NATIVE_WIDTH * 3):
CopyLineReduce<3, NEEDENDIANSWAP, ELEMENTSIZE>(dst, src, GPU_FRAMEBUFFER_NATIVE_WIDTH * 3);
break;
case (GPU_FRAMEBUFFER_NATIVE_WIDTH * 4):
CopyLineReduce<4, NEEDENDIANSWAP, ELEMENTSIZE>(dst, src, GPU_FRAMEBUFFER_NATIVE_WIDTH * 4);
break;
default:
{
if ((srcLineWidth % GPU_FRAMEBUFFER_NATIVE_WIDTH) == 0)
{
CopyLineReduce<0xFFFF, NEEDENDIANSWAP, ELEMENTSIZE>(dst, src, srcLineWidth);
}
else
{
CopyLineReduce<-1, NEEDENDIANSWAP, ELEMENTSIZE>(dst, src, srcLineWidth);
}
break;
}
}
break;
}
}
}
template <s32 INTEGERSCALEHINT, bool USELINEINDEX, bool NEEDENDIANSWAP, size_t ELEMENTSIZE>
static void CopyLineReduceHinted(const GPUEngineLineInfo &lineInfo, const void *__restrict srcBuffer, void *__restrict dstBuffer)
{
CopyLineReduceHinted<INTEGERSCALEHINT, USELINEINDEX, NEEDENDIANSWAP, ELEMENTSIZE>(srcBuffer, lineInfo.indexCustom, lineInfo.widthCustom,
dstBuffer, lineInfo.indexNative);
}
/*****************************************************************************/
// BACKGROUND RENDERING -ROTOSCALE-
/*****************************************************************************/
@ -9071,7 +9144,7 @@ u8* GPUSubsystem::_DownscaleAndConvertForSavestate(const NDSDisplayID displayID,
for (size_t l = 0; l < GPU_FRAMEBUFFER_NATIVE_HEIGHT; l++)
{
CopyLineReduce<-1, true, 2>(dst, src, this->_displayInfo.customWidth);
CopyLineReduceHinted<0xFFFF, false, true, 2>(src, _gpuDstLineIndex[l], this->_displayInfo.customWidth, dst, l);
src += _gpuDstLineCount[l] * this->_displayInfo.customWidth;
dst += GPU_FRAMEBUFFER_NATIVE_WIDTH;
}
@ -9086,7 +9159,7 @@ u8* GPUSubsystem::_DownscaleAndConvertForSavestate(const NDSDisplayID displayID,
for (size_t l = 0; l < GPU_FRAMEBUFFER_NATIVE_HEIGHT; l++)
{
CopyLineReduce<-1, true, 4>(dst, src, this->_displayInfo.customWidth);
CopyLineReduceHinted<0xFFFF, false, true, 4>(src, _gpuDstLineIndex[l], this->_displayInfo.customWidth, dst, l);
src += _gpuDstLineCount[l] * this->_displayInfo.customWidth;
dst += GPU_FRAMEBUFFER_NATIVE_WIDTH;
}