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shader_decompiler: Remove FragCoord.w hack and change IPA implementation

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Credits go to gdkchan and Ryujinx. The pull request used for this can
be found here: https://github.com/Ryujinx/Ryujinx/pull/1082

yuzu was already using the header for interpolation, but it was missing
the FragCoord.w multiplication described in the linked pull request.
This commit finally removes the FragCoord.w == 1.0f hack from the shader
decompiler.

While we are at it, this commit renames some enumerations to match
Nvidia's documentation (linked below) and fixes component declaration
order in the shader program header (z and w were swapped).

https://github.com/NVIDIA/open-gpu-doc/blob/master/Shader-Program-Header/Shader-Program-Header.html
This commit is contained in:
ReinUsesLisp
2020-04-01 21:37:32 -03:00
parent baf91c920c
commit 2339fe199f
4 changed files with 74 additions and 68 deletions
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17
src/video_core/renderer_vulkan/vk_shader_decompiler.cpp
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@ -35,7 +35,7 @@ namespace {
using Sirit::Id;
using Tegra::Engines::ShaderType;
using Tegra::Shader::Attribute;
using Tegra::Shader::AttributeUse;
using Tegra::Shader::PixelImap;
using Tegra::Shader::Register;
using namespace VideoCommon::Shader;
@ -752,16 +752,16 @@ private:
if (stage != ShaderType::Fragment) {
continue;
}
switch (header.ps.GetAttributeUse(location)) {
case AttributeUse::Constant:
switch (header.ps.GetPixelImap(location)) {
case PixelImap::Constant:
Decorate(id, spv::Decoration::Flat);
break;
case AttributeUse::ScreenLinear:
Decorate(id, spv::Decoration::NoPerspective);
break;
case AttributeUse::Perspective:
case PixelImap::Perspective:
// Default
break;
case PixelImap::ScreenLinear:
Decorate(id, spv::Decoration::NoPerspective);
break;
default:
UNREACHABLE_MSG("Unused attribute being fetched");
}
@ -1145,9 +1145,6 @@ private:
switch (attribute) {
case Attribute::Index::Position: {
if (stage == ShaderType::Fragment) {
if (element == 3) {
return {Constant(t_float, 1.0f), Type::Float};
}
return {OpLoad(t_float, AccessElement(t_in_float, frag_coord, element)),
Type::Float};
}