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PosS16Through: Treat Z as unsigned.

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Henrik Rydgård 2014-02-13 11:59:47 +01:00
parent 5fa6a947d9
commit 79549e4acc
3 changed files with 16 additions and 2 deletions
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13
GPU/GLES/VertexDecoderX86.cpp
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@ -765,6 +765,9 @@ void VertexDecoderJitCache::Jit_PosS8Through() {
// Through expands into floats, always. Might want to look at changing this.
void VertexDecoderJitCache::Jit_PosS16Through() {
// This commented out version is likely slightly faster but treats all three as signed, which
// appears to be wrong.
/*
XORPS(XMM3, R(XMM3));
MOVQ_xmm(XMM1, MDisp(srcReg, dec_->posoff));
PUNPCKLWD(XMM1, R(XMM3));
@ -772,6 +775,16 @@ void VertexDecoderJitCache::Jit_PosS16Through() {
PSRAD(XMM1, 16); // Ugly sign extension, can be done faster in SSE4
CVTDQ2PS(XMM3, R(XMM1));
MOVUPS(MDisp(dstReg, dec_->decFmt.posoff), XMM3);
*/
MOVSX(32, 16, tempReg1, MDisp(srcReg, dec_->posoff));
MOVSX(32, 16, tempReg2, MDisp(srcReg, dec_->posoff + 2));
MOVZX(32, 16, tempReg3, MDisp(srcReg, dec_->posoff + 4)); // NOTE: MOVZX
CVTSI2SS(fpScratchReg, R(tempReg1));
MOVSS(MDisp(dstReg, dec_->decFmt.posoff), fpScratchReg);
CVTSI2SS(fpScratchReg, R(tempReg2));
MOVSS(MDisp(dstReg, dec_->decFmt.posoff + 4), fpScratchReg);
CVTSI2SS(fpScratchReg, R(tempReg3));
MOVSS(MDisp(dstReg, dec_->decFmt.posoff + 8), fpScratchReg);
}
// Copy 3 bytes and then a zero. Might as well copy four.