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Merge pull request #767 from Lectem/DOT3_RGB
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commit
04cb7ae601
@ -290,6 +290,7 @@ struct Regs {
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AddSigned = 3,
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Lerp = 4,
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Subtract = 5,
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Dot3_RGB = 6,
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MultiplyThenAdd = 8,
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AddThenMultiply = 9,
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@ -641,7 +641,18 @@ static void ProcessTriangleInternal(const VertexShader::OutputVertex& v0,
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result = (result * input[2].Cast<int>()) / 255;
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return result.Cast<u8>();
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}
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case Operation::Dot3_RGB:
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{
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// Not fully accurate.
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// Worst case scenario seems to yield a +/-3 error
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// Some HW results indicate that the per-component computation can't have a higher precision than 1/256,
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// while dot3_rgb( (0x80,g0,b0),(0x7F,g1,b1) ) and dot3_rgb( (0x80,g0,b0),(0x80,g1,b1) ) give different results
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int result = ((input[0].r() * 2 - 255) * (input[1].r() * 2 - 255) + 128) / 256 +
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((input[0].g() * 2 - 255) * (input[1].g() * 2 - 255) + 128) / 256 +
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((input[0].b() * 2 - 255) * (input[1].b() * 2 - 255) + 128) / 256;
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result = std::max(0, std::min(255, result));
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return { (u8)result, (u8)result, (u8)result };
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}
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default:
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LOG_ERROR(HW_GPU, "Unknown color combiner operation %d\n", (int)op);
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UNIMPLEMENTED();
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