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softgpu: Use SSE for lighting ceil if available.

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Tiny optimization, helps only a little.
This commit is contained in:
Unknown W. Brackets 2023-04-16 10:54:25 -07:00
parent b5206df04f
commit 2868495cf8
1 changed files with 22 additions and 3 deletions
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25
GPU/Software/Lighting.cpp
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@ -197,6 +197,25 @@ void GenerateLightST(VertexData &vertex, const WorldCoords &worldnormal) {
vertex.texturecoords.t() = GenerateLightCoord(vertex, worldnormal, gstate.getUVLS1());
}
#if defined(_M_SSE)
#if defined(__GNUC__) || defined(__clang__) || defined(__INTEL_COMPILER)
[[gnu::target("sse4.1")]]
#endif
static inline int LightCeilSSE4(float f) {
__m128 v = _mm_set_ss(f);
// This isn't terribly fast, but seems to be better than calling ceilf().
return _mm_cvt_ss2si(_mm_ceil_ss(v, v));
}
#endif
static inline int LightCeil(float f) {
#if defined(_M_SSE)
if (cpu_info.bSSE4_1)
return LightCeilSSE4(f);
#endif
return (int)ceilf(f);
}
void Process(VertexData &vertex, const WorldCoords &worldpos, const WorldCoords &worldnormal, const State &state) {
// Lighting blending rounds using the half offset method (like alpha blend.)
const Vec4<int> ones = Vec4<int>::AssignToAll(1);
@ -250,7 +269,7 @@ void Process(VertexData &vertex, const WorldCoords &worldpos, const WorldCoords
// ambient lighting
if (lstate.ambient) {
int attspot = (int)ceilf(256 * 2 * att * spot + 1);
int attspot = (int)LightCeil(256 * 2 * att * spot + 1);
if (attspot > 512)
attspot = 512;
Vec4<int> lambient = (mac * lstate.ambientColorFactor * attspot) / (1024 * 512);
@ -267,7 +286,7 @@ void Process(VertexData &vertex, const WorldCoords &worldpos, const WorldCoords
}
if (lstate.diffuse && diffuse_factor > 0.0f) {
int diffuse_attspot = (int)ceilf(256 * 2 * att * spot * diffuse_factor + 1);
int diffuse_attspot = (int)LightCeil(256 * 2 * att * spot * diffuse_factor + 1);
if (diffuse_attspot > 512)
diffuse_attspot = 512;
Vec4<int> mdc = state.colorForDiffuse ? colorFactor : state.material.diffuseColorFactor;
@ -282,7 +301,7 @@ void Process(VertexData &vertex, const WorldCoords &worldpos, const WorldCoords
specular_factor = pspLightPow(specular_factor, state.specularExp);
if (specular_factor > 0.0f) {
int specular_attspot = (int)ceilf(256 * 2 * att * spot * specular_factor + 1);
int specular_attspot = (int)LightCeil(256 * 2 * att * spot * specular_factor + 1);
if (specular_attspot > 512)
specular_attspot = 512;