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Pica/BlendUnit: Implement separate color/alpha blend equations.

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This commit is contained in:
Tony Wasserka 2015-02-11 21:39:43 +01:00
parent 81ebb4d682
commit 1561204342
2 changed files with 59 additions and 65 deletions
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2
src/video_core/pica.h
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@ -343,7 +343,7 @@ struct Regs {
};
union {
enum BlendEquation : u32 {
enum class BlendEquation : u32 {
Add = 0,
Subtract = 1,
ReverseSubtract = 2,

122
src/video_core/rasterizer.cpp
View file

@ -5,6 +5,7 @@
#include <algorithm>
#include "common/common_types.h"
#include "common/math_util.h"
#include "math.h"
#include "pica.h"
@ -596,6 +597,7 @@ static void ProcessTriangleInternal(const VertexShader::OutputVertex& v0,
}
auto dest = GetPixel(x >> 4, y >> 4);
Math::Vec4<u8> blend_output = combiner_output;
if (registers.output_merger.alphablend_enable) {
auto params = registers.output_merger.alpha_blending;
@ -684,81 +686,73 @@ static void ProcessTriangleInternal(const VertexShader::OutputVertex& v0,
}
};
using BlendEquation = decltype(params)::BlendEquation;
static auto EvaluateBlendEquation = [](const Math::Vec4<u8>& src, const Math::Vec4<u8>& srcfactor,
const Math::Vec4<u8>& dest, const Math::Vec4<u8>& destfactor,
BlendEquation equation) {
Math::Vec4<int> result;
auto src_result = (src * srcfactor).Cast<int>();
auto dst_result = (dest * destfactor).Cast<int>();
switch (equation) {
case BlendEquation::Add:
result = (src_result + dst_result) / 255;
break;
case BlendEquation::Subtract:
result = (src_result - dst_result) / 255;
break;
case BlendEquation::ReverseSubtract:
result = (dst_result - src_result) / 255;
break;
// TODO: How do these two actually work?
// OpenGL doesn't include the blend factors in the min/max computations,
// but is this what the 3DS actually does?
case BlendEquation::Min:
result.r() = std::min(src.r(), dest.r());
result.g() = std::min(src.g(), dest.g());
result.b() = std::min(src.b(), dest.b());
result.a() = std::min(src.a(), dest.a());
break;
case BlendEquation::Max:
result.r() = std::max(src.r(), dest.r());
result.g() = std::max(src.g(), dest.g());
result.b() = std::max(src.b(), dest.b());
result.a() = std::max(src.a(), dest.a());
break;
default:
LOG_CRITICAL(HW_GPU, "Unknown RGB blend equation %x", equation);
exit(0);
}
return Math::Vec4<u8>(MathUtil::Clamp(result.r(), 0, 255),
MathUtil::Clamp(result.g(), 0, 255),
MathUtil::Clamp(result.b(), 0, 255),
MathUtil::Clamp(result.a(), 0, 255));
};
auto srcfactor = Math::MakeVec(LookupFactorRGB(params.factor_source_rgb),
LookupFactorA(params.factor_source_a));
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 = (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());
combiner_output = result.Cast<u8>();
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:
{
// TODO: GL spec says to do it without the factors, but is this what the 3DS does?
Math::Vec4<int> result;
result.r() = std::min(combiner_output.r(),dest.r());
result.g() = std::min(combiner_output.g(),dest.g());
result.b() = std::min(combiner_output.b(),dest.b());
combiner_output = result.Cast<u8>();
break;
}
case params.Max:
{
// TODO: GL spec says to do it without the factors, but is this what the 3DS does?
Math::Vec4<int> result;
result.r() = std::max(combiner_output.r(),dest.r());
result.g() = std::max(combiner_output.g(),dest.g());
result.b() = std::max(combiner_output.b(),dest.b());
combiner_output = result.Cast<u8>();
break;
}
default:
LOG_CRITICAL(HW_GPU, "Unknown RGB blend equation %x", params.blend_equation_rgb.Value());
exit(0);
}
blend_output = EvaluateBlendEquation(combiner_output, srcfactor, dest, dstfactor, params.blend_equation_rgb);
blend_output.a() = EvaluateBlendEquation(combiner_output, srcfactor, dest, dstfactor, params.blend_equation_a).a();
} else {
LOG_CRITICAL(HW_GPU, "logic op: %x", registers.output_merger.logic_op);
exit(0);
}
const Math::Vec4<u8> result = {
registers.output_merger.red_enable ? combiner_output.r() : dest.r(),
registers.output_merger.green_enable ? combiner_output.g() : dest.g(),
registers.output_merger.blue_enable ? combiner_output.b() : dest.b(),
registers.output_merger.alpha_enable ? combiner_output.a() : dest.a()
registers.output_merger.red_enable ? blend_output.r() : dest.r(),
registers.output_merger.green_enable ? blend_output.g() : dest.g(),
registers.output_merger.blue_enable ? blend_output.b() : dest.b(),
registers.output_merger.alpha_enable ? blend_output.a() : dest.a()
};
DrawPixel(x >> 4, y >> 4, result);