Pica/BlendUnit: Implement separate color/alpha blend equations.
This commit is contained in:
parent
81ebb4d682
commit
1561204342
|
@ -343,7 +343,7 @@ struct Regs {
|
|||
};
|
||||
|
||||
union {
|
||||
enum BlendEquation : u32 {
|
||||
enum class BlendEquation : u32 {
|
||||
Add = 0,
|
||||
Subtract = 1,
|
||||
ReverseSubtract = 2,
|
||||
|
|
|
@ -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);
|
||||
|
|
Reference in New Issue