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PixelShaderGen: Implement tev combiner lerping in a faster way which also reproduces hardware behavior perfectly.

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The new behavior has been verified to be correct by hardware tests. This is an improvement over the old code, which was just a guess.
This commit is contained in:
Tony Wasserka
2014-03-20 20:49:09 +01:00
parent fdad95c055
commit 4f82d6f7af
1 changed files with 22 additions and 30 deletions
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52
Source/Core/VideoCommon/PixelShaderGen.cpp
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@ -759,19 +759,35 @@ static inline void WriteStage(T& out, pixel_shader_uid_data& uid_data, int n, AP
out.SetConstantsUsed(C_COLORS+ac.dest, C_COLORS+ac.dest); out.SetConstantsUsed(C_COLORS+ac.dest, C_COLORS+ac.dest);
const char *tevScaleTable[] = const char *tevScaleTableLeft[] =
{ {
"", // SCALE_1 "", // SCALE_1
" << 1", // SCALE_2 " << 1", // SCALE_2
" << 2", // SCALE_4 " << 2", // SCALE_4
"", // DIVIDE_2
};
const char *tevScaleTableRight[] =
{
"", // SCALE_1
"", // SCALE_2
"", // SCALE_4
" >> 1", // DIVIDE_2 " >> 1", // DIVIDE_2
}; };
const char *tevLerpBias[] = // indexed by 2*op+(shift==3)
{
"",
" + 128",
"",
" + 127",
};
const char *tevBiasTable[] = const char *tevBiasTable[] =
{ {
"", // ZERO, "", // ZERO,
"+ 128", // ADDHALF, " + 128", // ADDHALF,
"- 128", // SUBHALF, " - 128", // SUBHALF,
"", "",
}; };
@ -791,19 +807,7 @@ static inline void WriteStage(T& out, pixel_shader_uid_data& uid_data, int n, AP
// combine the color channel // combine the color channel
if (cc.bias != TevBias_COMPARE) // if not compare if (cc.bias != TevBias_COMPARE) // if not compare
{ {
//normal color combiner goes here out.Write("(((tevin_d.rgb%s)%s) %s ((((tevin_a.rgb*256 + (tevin_b.rgb-tevin_a.rgb)*(tevin_c.rgb+(tevin_c.rgb>>7)))%s)%s)>>8))%s", tevBiasTable[cc.bias], tevScaleTableLeft[cc.shift], tevOpTable[cc.op], tevScaleTableLeft[cc.shift], tevLerpBias[2*cc.op+(cc.shift==3)], tevScaleTableRight[cc.shift]);
if (cc.shift > TEVSCALE_1)
out.Write("(");
if (!(cc.d == TEVCOLORARG_ZERO && cc.op == TEVOP_ADD))
out.Write("tevin_d.rgb %s ", tevOpTable[cc.op]);
out.Write("(tevin_a.rgb * (int3(255,255,255) - tevin_c.rgb) + tevin_b.rgb * tevin_c.rgb) / 255");
out.Write(" %s", tevBiasTable[cc.bias]);
if (cc.shift > TEVSCALE_1)
out.Write(")%s", tevScaleTable[cc.shift]);
} }
else else
{ {
@ -834,19 +838,7 @@ static inline void WriteStage(T& out, pixel_shader_uid_data& uid_data, int n, AP
if (ac.bias != TevBias_COMPARE) // if not compare if (ac.bias != TevBias_COMPARE) // if not compare
{ {
//normal alpha combiner goes here out.Write("(((tevin_d.a%s)%s) %s ((((tevin_a.a*256 + (tevin_b.a-tevin_a.a)*(tevin_c.a+(tevin_c.a>>7)))%s)%s)>>8))%s", tevBiasTable[ac.bias], tevScaleTableLeft[ac.shift], tevOpTable[ac.op], tevScaleTableLeft[ac.shift], tevLerpBias[2*ac.op+(ac.shift==3)], tevScaleTableRight[ac.shift]);
if (ac.shift > 0)
out.Write("(");
if (!(ac.d == TEVALPHAARG_ZERO && ac.op == TEVOP_ADD))
out.Write("tevin_d.a %s ", tevOpTable[ac.op]);
out.Write("(tevin_a.a * (255 - tevin_c.a) + tevin_b.a * tevin_c.a) / 255");
out.Write(" %s",tevBiasTable[ac.bias]);
if (ac.shift>0)
out.Write(")%s", tevScaleTable[ac.shift]);
} }
else else
{ {