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Port Dot3RGB and Dot3RGBA from zmm-progress in a less broken way

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This commit is contained in:
Darius Goad 2015-03-13 01:35:58 -05:00
parent ed5b275d21
commit be26257f8f
2 changed files with 26 additions and 0 deletions
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2
src/video_core/pica.h
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@ -262,6 +262,8 @@ struct Regs {
Lerp = 4,
Subtract = 5,
Dot3RGB = 6,
Dot3RGBA = 7,
MultiplyThenAdd = 8,
AddThenMultiply = 9,
};

24
src/video_core/rasterizer.cpp
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@ -502,6 +502,20 @@ static void ProcessTriangleInternal(const VertexShader::OutputVertex& v0,
return result.Cast<u8>();
}
// This computes the dot product of the RGB components according to GLES spec.
// Dot3RGB just stores the dot product in the RGB components.
// Dot3RGBA also stores it in the alpha component.
case Operation::Dot3RGB:
case Operation::Dot3RGBA:
{
std::array<int, 3> a = {input[0].r(), input[0].g(), input[0].b()};
std::array<int, 3> b = {input[1].r(), input[1].g(), input[1].b()};
auto res = std::inner_product(a, a.end(), b, 0);
return {res, res, res};
}
case Operation::MultiplyThenAdd:
{
auto result = (input[0] * input[1] + 255 * input[2].Cast<int>()) / 255;
@ -545,6 +559,16 @@ static void ProcessTriangleInternal(const VertexShader::OutputVertex& v0,
case Operation::Subtract:
return std::max(0, (int)input[0] - (int)input[1]);
case Operation::Dot3RGBA:
{
std::array<int, 3> a = {input[0].r(), input[0].g(), input[0].b()};
std::array<int, 3> b = {input[1].r(), input[1].g(), input[1].b()};
auto res = std::inner_product(a, a.end(), b, 0);
return res;
}
case Operation::MultiplyThenAdd:
return std::min(255, (input[0] * input[1] + 255 * input[2]) / 255);