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JIT-less vertex decoder: SSE/NEON-optimize ComputeSkinMatrix #19244

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Jun 4, 2024
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JIT-less vertex decoder: SSE/NEON-optimize ComputeSkinMatrix #19244

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37 changes: 36 additions & 1 deletion GPU/Common/VertexDecoderCommon.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -253,14 +253,49 @@ void VertexDecoder::Step_WeightsFloat() const

void VertexDecoder::ComputeSkinMatrix(const float weights[8]) const {
memset(skinMatrix, 0, sizeof(skinMatrix));
for (int j = 0; j < nweights; j++) {
int count = nweights;
#if PPSSPP_ARCH(SSE2)
__m128 skin0 = _mm_setzero_ps();
__m128 skin1 = _mm_setzero_ps();
__m128 skin2 = _mm_setzero_ps();
for (int j = 0; j < count; j++) {
const float *bone = &gstate.boneMatrix[j * 12];
if (weights[j] != 0.0f) {
__m128 w = _mm_set1_ps(weights[j]);
skin0 = _mm_add_ps(skin0, _mm_mul_ps(_mm_loadu_ps(bone), w));
skin1 = _mm_add_ps(skin1, _mm_mul_ps(_mm_loadu_ps(bone + 4), w));
skin2 = _mm_add_ps(skin2, _mm_mul_ps(_mm_loadu_ps(bone + 8), w));
}
}
_mm_store_ps(skinMatrix, skin0);
_mm_store_ps(skinMatrix + 4, skin1);
_mm_store_ps(skinMatrix + 8, skin2);
#elif PPSSPP_ARCH(ARM_NEON)
float32x4_t skin0 = vdupq_n_f32(0.0f);
float32x4_t skin1 = vdupq_n_f32(0.0f);
float32x4_t skin2 = vdupq_n_f32(0.0f);
for (int j = 0; j < count; j++) {
const float *bone = &gstate.boneMatrix[j * 12];
if (weights[j] != 0.0f) {
float32x4_t w = vdupq_n_f32(weights[j]);
skin0 = vaddq_f32(skin0, vmulq_f32(vld1q_f32(bone), w));
skin1 = vaddq_f32(skin1, vmulq_f32(vld1q_f32(bone + 4), w));
skin2 = vaddq_f32(skin2, vmulq_f32(vld1q_f32(bone + 8), w));
}
}
vst1q_f32(skinMatrix, skin0);
vst1q_f32(skinMatrix + 4, skin1);
vst1q_f32(skinMatrix + 8, skin2);
#else
for (int j = 0; j < count; j++) {
const float *bone = &gstate.boneMatrix[j * 12];
if (weights[j] != 0.0f) {
for (int i = 0; i < 12; i++) {
skinMatrix[i] += weights[j] * bone[i];
}
}
}
#endif
}

void VertexDecoder::Step_WeightsU8Skin() const {
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