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SSE: Refactor AddStrip to prepare for early out

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This commit is contained in:
Henrik Rydgård 2023-05-30 00:37:01 +02:00
parent 22632b82bd
commit 39034586a4
1 changed files with 13 additions and 9 deletions
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22
GPU/Common/IndexGenerator.cpp
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@ -121,7 +121,6 @@ alignas(16) static const uint16_t offsets_counter_clockwise[24] = {
void IndexGenerator::AddStrip(int numVerts, bool clockwise) {
int numTris = numVerts - 2;
#ifdef _M_SSE
// In an SSE2 register we can fit 8 16-bit integers.
// However, we need to output a multiple of 3 indices.
@ -134,16 +133,21 @@ void IndexGenerator::AddStrip(int numVerts, bool clockwise) {
__m128i ibase8 = _mm_set1_epi16(index_);
__m128i increment = _mm_set1_epi16(8);
const __m128i *offsets = (const __m128i *)(clockwise ? offsets_clockwise : offsets_counter_clockwise);
__m128i offsets0 = _mm_load_si128(offsets);
__m128i offsets1 = _mm_load_si128(offsets + 1);
__m128i offsets2 = _mm_load_si128(offsets + 2);
__m128i offsets0 = _mm_add_epi16(ibase8, _mm_load_si128(offsets));
__m128i offsets1 = _mm_add_epi16(ibase8, _mm_load_si128(offsets + 1));
__m128i offsets2 = _mm_add_epi16(ibase8, _mm_load_si128(offsets + 2));
__m128i *dst = (__m128i *)inds_;
for (int i = 0; i < numChunks; i++) {
_mm_storeu_si128(dst, _mm_add_epi16(ibase8, offsets0));
_mm_storeu_si128(dst + 1, _mm_add_epi16(ibase8, offsets1));
_mm_storeu_si128(dst + 2, _mm_add_epi16(ibase8, offsets2));
ibase8 = _mm_add_epi16(ibase8, increment);
_mm_storeu_si128(dst, offsets0);
_mm_storeu_si128(dst + 1, offsets1);
_mm_storeu_si128(dst + 2, offsets2);
for (int i = 1; i < numChunks; i++) {
offsets0 = _mm_add_epi16(offsets0, increment);
offsets1 = _mm_add_epi16(offsets1, increment);
offsets2 = _mm_add_epi16(offsets2, increment);
dst += 3;
_mm_storeu_si128(dst, offsets0);
_mm_storeu_si128(dst + 1, offsets1);
_mm_storeu_si128(dst + 2, offsets2);
}
inds_ += numTris * 3;
// wind doesn't need to be updated, an even number of triangles have been drawn.