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Add more blend equations from 3dbrew

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This commit is contained in:
Darius Goad 2015-02-07 11:43:08 -06:00
parent c4e636681e
commit 536958fb29
2 changed files with 49 additions and 2 deletions
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4
src/video_core/pica.h
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@ -339,6 +339,10 @@ struct Regs {
union {
enum BlendEquation : u32 {
Add = 0,
Subtract = 1,
ReverseSubtract = 2,
Min = 3,
Max = 4
};
enum BlendFactor : u32 {

45
src/video_core/rasterizer.cpp
View file

@ -617,10 +617,13 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0,
auto dstfactor = Math::MakeVec(LookupFactorRGB(params.factor_dest_rgb),
LookupFactorA(params.factor_dest_a));
auto src_result = (combiner_output * srcfactor).Cast<int>();
auto dst_result = (dest * dstfactor).Cast<int>();
switch (params.blend_equation_rgb) {
case params.Add:
{
auto result = (combiner_output * srcfactor + dest * dstfactor) / 255;
auto result = (src_result + dst_result) / 255;
result.r() = std::min(255, result.r());
result.g() = std::min(255, result.g());
result.b() = std::min(255, result.b());
@ -628,6 +631,46 @@ void ProcessTriangle(const VertexShader::OutputVertex& v0,
break;
}
case params.Subtract:
{
auto result = (src_result - dst_result) / 255;
result.r() = std::max(0, result.r());
result.g() = std::max(0, result.g());
result.b() = std::max(0, result.b());
combiner_output = result.Cast<u8>();
break;
}
case params.ReverseSubtract:
{
auto result = (dst_result - src_result) / 255;
result.r() = std::max(0, result.r());
result.g() = std::max(0, result.g());
result.b() = std::max(0, result.b());
combiner_output = result.Cast<u8>();
break;
}
case params.Min:
{
Math::Vec4<int> result;
result.r() = std::min(src_result.r(),dst_result.r());
result.g() = std::min(src_result.g(),dst_result.g());
result.b() = std::min(src_result.b(),dst_result.b());
combiner_output = result.Cast<u8>();
break;
}
case params.Max:
{
Math::Vec4<int> result;
result.r() = std::max(src_result.r(),dst_result.r());
result.g() = std::max(src_result.g(),dst_result.g());
result.b() = std::max(src_result.b(),dst_result.b());
combiner_output = result.Cast<u8>();
break;
}
default:
LOG_CRITICAL(HW_GPU, "Unknown RGB blend equation %x", params.blend_equation_rgb.Value());
exit(0);