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Help the compiler out a little bit in IndexGenerator::AddStrip.

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The generated code wasn't good - this helps break long register
dependency chains.

Speed boost is measurable but small on x86, but might be bigger on simpler CPUs.
This commit is contained in:
Henrik Rydgård 2020-09-16 09:21:42 +02:00
parent ce46adb7ac
commit c1194dcb52
1 changed files with 12 additions and 2 deletions
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14
GPU/Common/IndexGenerator.cpp
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@ -88,12 +88,22 @@ void IndexGenerator::AddStrip(int numVerts, bool clockwise) {
const int numTris = numVerts - 2;
u16 *outInds = inds_;
int ibase = index_;
for (int i = 0; i < numTris; i++) {
size_t numPairs = numTris / 2;
while (numPairs > 0) {
*outInds++ = ibase;
*outInds++ = ibase + wind;
*outInds++ = ibase + (wind ^ 3);
*outInds++ = ibase + 1;
*outInds++ = ibase + 1 + (wind ^ 3);
*outInds++ = ibase + 1 + wind;
ibase += 2;
numPairs--;
}
if (numTris & 1) {
*outInds++ = ibase;
*outInds++ = ibase + wind;
wind ^= 3; // toggle between 1 and 2
*outInds++ = ibase + wind;
ibase++;
}
inds_ = outInds;
index_ += numVerts;