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softgpu: Use SSE in alpha blending.
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@unknownbrackets
unknownbrackets committed Mar 17, 2014
1 parent 601ff10 commit 07ca96e
Showing 1 changed file with 61 additions and 14 deletions.
75 changes: 61 additions & 14 deletions GPU/Software/Rasterizer.cpp
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Expand Up @@ -773,7 +773,7 @@ static inline bool AlphaTestPassed(int alpha)
return true;
}

static inline Vec3<int> GetSourceFactor(int source_a, const Vec4<int>& dst)
static inline Vec3<int> GetSourceFactor(const Vec4<int>& source, const Vec4<int>& dst)
{
switch (gstate.getBlendFuncA()) {
case GE_SRCBLEND_DSTCOLOR:
Expand All @@ -783,10 +783,18 @@ static inline Vec3<int> GetSourceFactor(int source_a, const Vec4<int>& dst)
return Vec3<int>::AssignToAll(255) - dst.rgb();

case GE_SRCBLEND_SRCALPHA:
return Vec3<int>::AssignToAll(source_a);
#if defined(_M_SSE)
return Vec3<int>(_mm_shuffle_epi32(source.ivec, _MM_SHUFFLE(3, 3, 3, 3)));
#else
return Vec3<int>::AssignToAll(source.a());
#endif

case GE_SRCBLEND_INVSRCALPHA:
return Vec3<int>::AssignToAll(255 - source_a);
#if defined(_M_SSE)
return Vec3<int>(_mm_sub_epi32(_mm_set1_epi32(255), _mm_shuffle_epi32(source.ivec, _MM_SHUFFLE(3, 3, 3, 3))));
#else
return Vec3<int>::AssignToAll(255 - source.a());
#endif

case GE_SRCBLEND_DSTALPHA:
return Vec3<int>::AssignToAll(dst.a());
Expand All @@ -795,10 +803,10 @@ static inline Vec3<int> GetSourceFactor(int source_a, const Vec4<int>& dst)
return Vec3<int>::AssignToAll(255 - dst.a());

case GE_SRCBLEND_DOUBLESRCALPHA:
return Vec3<int>::AssignToAll(2 * source_a);
return Vec3<int>::AssignToAll(2 * source.a());

case GE_SRCBLEND_DOUBLEINVSRCALPHA:
return Vec3<int>::AssignToAll(255 - 2 * source_a);
return Vec3<int>::AssignToAll(255 - 2 * source.a());

case GE_SRCBLEND_DOUBLEDSTALPHA:
return Vec3<int>::AssignToAll(2 * dst.a());
Expand All @@ -816,20 +824,28 @@ static inline Vec3<int> GetSourceFactor(int source_a, const Vec4<int>& dst)
}
}

static inline Vec3<int> GetDestFactor(const Vec3<int>& source_rgb, int source_a, const Vec4<int>& dst)
static inline Vec3<int> GetDestFactor(const Vec4<int>& source, const Vec4<int>& dst)
{
switch (gstate.getBlendFuncB()) {
case GE_DSTBLEND_SRCCOLOR:
return source_rgb;
return source.rgb();

case GE_DSTBLEND_INVSRCCOLOR:
return Vec3<int>::AssignToAll(255) - source_rgb;
return Vec3<int>::AssignToAll(255) - source.rgb();

case GE_DSTBLEND_SRCALPHA:
return Vec3<int>::AssignToAll(source_a);
#if defined(_M_SSE)
return Vec3<int>(_mm_shuffle_epi32(source.ivec, _MM_SHUFFLE(3, 3, 3, 3)));
#else
return Vec3<int>::AssignToAll(source.a());
#endif

case GE_DSTBLEND_INVSRCALPHA:
return Vec3<int>::AssignToAll(255 - source_a);
#if defined(_M_SSE)
return Vec3<int>(_mm_sub_epi32(_mm_set1_epi32(255), _mm_shuffle_epi32(source.ivec, _MM_SHUFFLE(3, 3, 3, 3))));
#else
return Vec3<int>::AssignToAll(255 - source.a());
#endif

case GE_DSTBLEND_DSTALPHA:
return Vec3<int>::AssignToAll(dst.a());
Expand All @@ -838,10 +854,10 @@ static inline Vec3<int> GetDestFactor(const Vec3<int>& source_rgb, int source_a,
return Vec3<int>::AssignToAll(255 - dst.a());

case GE_DSTBLEND_DOUBLESRCALPHA:
return Vec3<int>::AssignToAll(2 * source_a);
return Vec3<int>::AssignToAll(2 * source.a());

case GE_DSTBLEND_DOUBLEINVSRCALPHA:
return Vec3<int>::AssignToAll(255 - 2 * source_a);
return Vec3<int>::AssignToAll(255 - 2 * source.a());

case GE_DSTBLEND_DOUBLEDSTALPHA:
return Vec3<int>::AssignToAll(2 * dst.a());
Expand All @@ -860,18 +876,42 @@ static inline Vec3<int> GetDestFactor(const Vec3<int>& source_rgb, int source_a,

static inline Vec3<int> AlphaBlendingResult(const Vec4<int>& source, const Vec4<int> dst)
{
Vec3<int> srcfactor = GetSourceFactor(source.a(), dst);
Vec3<int> dstfactor = GetDestFactor(source.rgb(), source.a(), dst);
Vec3<int> srcfactor = GetSourceFactor(source, dst);
Vec3<int> dstfactor = GetDestFactor(source, dst);

switch (gstate.getBlendEq()) {
case GE_BLENDMODE_MUL_AND_ADD:
{
#if defined(_M_SSE)
const __m128 s = _mm_mul_ps(_mm_cvtepi32_ps(source.ivec), _mm_cvtepi32_ps(srcfactor.ivec));
const __m128 d = _mm_mul_ps(_mm_cvtepi32_ps(dst.ivec), _mm_cvtepi32_ps(dstfactor.ivec));
return Vec3<int>(_mm_cvtps_epi32(_mm_div_ps(_mm_add_ps(s, d), _mm_set_ps1(255.0f))));
#else
return (source.rgb() * srcfactor + dst.rgb() * dstfactor) / 255;
#endif
}

case GE_BLENDMODE_MUL_AND_SUBTRACT:
{
#if defined(_M_SSE)
const __m128 s = _mm_mul_ps(_mm_cvtepi32_ps(source.ivec), _mm_cvtepi32_ps(srcfactor.ivec));
const __m128 d = _mm_mul_ps(_mm_cvtepi32_ps(dst.ivec), _mm_cvtepi32_ps(dstfactor.ivec));
return Vec3<int>(_mm_cvtps_epi32(_mm_div_ps(_mm_sub_ps(s, d), _mm_set_ps1(255.0f))));
#else
return (source.rgb() * srcfactor - dst.rgb() * dstfactor) / 255;
#endif
}

case GE_BLENDMODE_MUL_AND_SUBTRACT_REVERSE:
{
#if defined(_M_SSE)
const __m128 s = _mm_mul_ps(_mm_cvtepi32_ps(source.ivec), _mm_cvtepi32_ps(srcfactor.ivec));
const __m128 d = _mm_mul_ps(_mm_cvtepi32_ps(dst.ivec), _mm_cvtepi32_ps(dstfactor.ivec));
return Vec3<int>(_mm_cvtps_epi32(_mm_div_ps(_mm_sub_ps(d, s), _mm_set_ps1(255.0f))));
#else
return (dst.rgb() * dstfactor - source.rgb() * srcfactor) / 255;
#endif
}

case GE_BLENDMODE_MIN:
return Vec3<int>(std::min(source.r(), dst.r()),
Expand Down Expand Up @@ -952,7 +992,14 @@ inline void DrawSinglePixel(const DrawingCoords &p, u16 z, Vec4<int> prim_color)

if (gstate.isAlphaBlendEnabled() && !clearMode) {
const Vec4<int> dst = Vec4<int>::FromRGBA(old_color);
#if defined(_M_SSE)
const Vec3<int> blended = AlphaBlendingResult(prim_color, dst);
const __m128i blended16 = _mm_packs_epi32(blended.ivec, blended.ivec);
new_color = _mm_cvtsi128_si32(_mm_packus_epi16(blended16, blended16));
new_color = (stencil << 24) | (new_color & 0x00FFFFFF);
#else
new_color = Vec4<int>(AlphaBlendingResult(prim_color, dst).Clamp(0, 255), stencil).ToRGBA();
#endif
} else {
if (!clearMode)
prim_color = prim_color.Clamp(0, 255);
Expand Down

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