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SoftRasterizer: Force the number of rendering threads to be a power-of-two since any additional threads that are not power-of-two will be wasted.

This commit is contained in:
rogerman 2018-07-25 15:18:36 -07:00
parent b6072287c5
commit cbd488e157
2 changed files with 19 additions and 31 deletions
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31
desmume/src/frontend/cocoa/cocoa_GPU.mm
View File

@ -448,36 +448,7 @@ public:
if (numberThreads == 0)
{
isCPUCoreCountAuto = YES;
if (numberCores >= 96)
{
numberCores = 128;
}
else if (numberCores >= 48)
{
numberCores = 64;
}
else if (numberCores >= 24)
{
numberCores = 32;
}
else if (numberCores >= 16)
{
numberCores = 16;
}
else if (numberCores >= 8)
{
numberCores = 8;
}
else if (numberCores >= 4)
{
numberCores = 4;
}
else if (numberCores >= 2)
{
numberCores = 2;
}
else
if (numberCores < 2)
{
numberCores = 1;
}

19
desmume/src/rasterize.cpp
View File

@ -1444,7 +1444,24 @@ SoftRasterizerRenderer::SoftRasterizerRenderer()
_HACK_viewer_rasterizerUnit.SetSLI(0, 1, false);
_threadCount = CommonSettings.num_cores;
const size_t coreCount = CommonSettings.num_cores;
_threadCount = coreCount;
// SoftRasterizer works best when the number of threads is a power-of-two.
// Ensure that the thread count is set to the previous power-of-two if the
// core count isn't already a power-of-two.
_threadCount--;
_threadCount |= (_threadCount >> 1);
_threadCount |= (_threadCount >> 2);
_threadCount |= (_threadCount >> 4);
_threadCount |= (_threadCount >> 8);
_threadCount |= (_threadCount >> 16);
_threadCount++;
if (_threadCount != coreCount)
{
_threadCount >>= 1;
}
if (_threadCount > SOFTRASTERIZER_MAX_THREADS)
{