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Add a few assumptions for performance

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This commit is contained in:
Pavel Krajcevski 2015-04-11 14:04:44 -07:00
parent d3f5eeab87
commit 77a78511c6
1 changed files with 13 additions and 4 deletions
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17
PVRTCEncoder/src/Indexer.h
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@ -67,18 +67,27 @@ class Indexer {
const uint32 m_Height; const uint32 m_Height;
uint32 Resolve(int32 i, uint32 limit) const { uint32 Resolve(int32 i, uint32 limit) const {
int32 l = static_cast<int32>(limit);
// Assumptions
assert(i > -l);
assert(i < 2*l);
int32 r; int32 r;
switch(m_WrapMode) { switch(m_WrapMode) {
case eWrapMode_Clamp: case eWrapMode_Clamp:
r = static_cast<uint32>(std::max(0, std::min<int32>(i, limit))); r = static_cast<uint32>(std::max(0, std::min(i, l)));
break; break;
case eWrapMode_Wrap: case eWrapMode_Wrap:
{ {
r = i; r = i;
int32 l = static_cast<int32>(limit); if ((l & (l-1)) == 0) {
while (r >= l) { r -= l; } r = (r + l) & (l - 1);
while (r < 0) { r += l; } } else {
if (r >= l) { r -= l; }
if (r < 0) { r += l; }
}
} }
break; break;
} }