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SPIR-V: Initialize undefined variables with 0 (#3526)

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* SPIR-V: Initialize undefined variables with a value

Changes undefined values on spir-v shaders (caused by phi nodes) to be initialized instead of truly undefined.

Fixes an issue with NVIDIA gpus seemingly not liking when a variable is _potentially_ undefined. Not sure about the details at the moment.

Fixes:
- Tilt shift blur effect in Link's Awakening (bottom of the screen)
- Potentially block flickering on newer NVIDIA gpus in Splatoon 2? Needs testing.

Testing is welcome.

* Update Ryujinx.Graphics.Shader/CodeGen/Spirv/CodeGenContext.cs

Co-authored-by: gdkchan <gab.dark.100@gmail.com>

Co-authored-by: gdkchan <gab.dark.100@gmail.com>
This commit is contained in:
riperiperi 2022-08-02 08:11:10 +02:00 committed by GitHub
parent 712361f6e1
commit f92650fcff
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 2 additions and 2 deletions
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2
Ryujinx.Graphics.Gpu/Shader/DiskCache/DiskCacheHostStorage.cs
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@ -22,7 +22,7 @@ namespace Ryujinx.Graphics.Gpu.Shader.DiskCache
private const ushort FileFormatVersionMajor = 1;
private const ushort FileFormatVersionMinor = 2;
private const uint FileFormatVersionPacked = ((uint)FileFormatVersionMajor << 16) | FileFormatVersionMinor;
private const uint CodeGenVersion = 13;
private const uint CodeGenVersion = 14;
private const string SharedTocFileName = "shared.toc";
private const string SharedDataFileName = "shared.data";

2
Ryujinx.Graphics.Shader/CodeGen/Spirv/CodeGenContext.cs
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@ -234,7 +234,7 @@ namespace Ryujinx.Graphics.Shader.CodeGen.Spirv
IrOperandType.Constant => GetConstant(type, operand),
IrOperandType.ConstantBuffer => GetConstantBuffer(type, operand),
IrOperandType.LocalVariable => GetLocal(type, operand),
IrOperandType.Undefined => Undef(GetType(type)),
IrOperandType.Undefined => Constant(GetType(type), 0),
_ => throw new ArgumentException($"Invalid operand type \"{operand.Type}\".")
};
}