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Make sure attributes used on subsequent shader stages are initialized (#2538)

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gdkchan 2021-08-11 17:27:00 -03:00 • committed by GitHub
parent 10d649e6d3
commit ed754af8d5
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GPG key ID: 4AEE18F83AFDEB23
15 changed files with 347 additions and 262 deletions
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63
Ryujinx.Graphics.Shader/CodeGen/Glsl/Declarations.cs
View file

@ -3,14 +3,12 @@ using Ryujinx.Graphics.Shader.StructuredIr;
using Ryujinx.Graphics.Shader.Translation;
using System;
using System.Linq;
using System.Numerics;
namespace Ryujinx.Graphics.Shader.CodeGen.Glsl
{
static class Declarations
{
// At least 16 attributes are guaranteed by the spec.
public const int MaxAttributes = 16;
public static void Declare(CodeGenContext context, StructuredProgramInfo info)
{
context.AppendLine("#version 450 core");
@ -129,14 +127,14 @@ namespace Ryujinx.Graphics.Shader.CodeGen.Glsl
context.AppendLine();
}
if (info.IAttributes.Count != 0 || context.Config.GpPassthrough)
if (context.Config.UsedInputAttributes != 0 || context.Config.GpPassthrough)
{
DeclareInputAttributes(context, info);
context.AppendLine();
}
if (info.OAttributes.Count != 0 || context.Config.Stage != ShaderStage.Fragment)
if (context.Config.UsedOutputAttributes != 0 || context.Config.Stage != ShaderStage.Fragment)
{
DeclareOutputAttributes(context, info);
@ -404,24 +402,14 @@ namespace Ryujinx.Graphics.Shader.CodeGen.Glsl
private static void DeclareInputAttributes(CodeGenContext context, StructuredProgramInfo info)
{
if (context.Config.GpPassthrough)
int usedAttribtes = context.Config.UsedInputAttributes;
while (usedAttribtes != 0)
{
for (int attr = 0; attr < MaxAttributes; attr++)
{
DeclareInputAttribute(context, info, attr);
}
int index = BitOperations.TrailingZeroCount(usedAttribtes);
foreach (int attr in info.IAttributes.OrderBy(x => x).Where(x => x >= MaxAttributes))
{
DeclareInputAttribute(context, info, attr);
}
}
else
{
foreach (int attr in info.IAttributes.OrderBy(x => x))
{
DeclareInputAttribute(context, info, attr);
}
DeclareInputAttribute(context, info, index);
usedAttribtes &= ~(1 << index);
}
}
@ -440,8 +428,7 @@ namespace Ryujinx.Graphics.Shader.CodeGen.Glsl
};
}
string pass = context.Config.GpPassthrough && !info.OAttributes.Contains(attr) ? "passthrough, " : string.Empty;
string pass = (context.Config.PassthroughAttributes & (1 << attr)) != 0 ? "passthrough, " : string.Empty;
string name = $"{DefaultNames.IAttributePrefix}{attr}";
if ((context.Config.Options.Flags & TranslationFlags.Feedback) != 0)
@ -461,34 +448,14 @@ namespace Ryujinx.Graphics.Shader.CodeGen.Glsl
private static void DeclareOutputAttributes(CodeGenContext context, StructuredProgramInfo info)
{
if (context.Config.Stage == ShaderStage.Fragment || context.Config.GpPassthrough)
int usedAttribtes = context.Config.UsedOutputAttributes;
while (usedAttribtes != 0)
{
DeclareUsedOutputAttributes(context, info);
}
else
{
DeclareAllOutputAttributes(context, info);
}
}
int index = BitOperations.TrailingZeroCount(usedAttribtes);
private static void DeclareUsedOutputAttributes(CodeGenContext context, StructuredProgramInfo info)
{
foreach (int attr in info.OAttributes.OrderBy(x => x))
{
DeclareOutputAttribute(context, attr);
}
}
DeclareOutputAttribute(context, index);
private static void DeclareAllOutputAttributes(CodeGenContext context, StructuredProgramInfo info)
{
for (int attr = 0; attr < MaxAttributes; attr++)
{
DeclareOutputAttribute(context, attr);
}
foreach (int attr in info.OAttributes.OrderBy(x => x).Where(x => x >= MaxAttributes))
{
DeclareOutputAttribute(context, attr);
usedAttribtes &= ~(1 << index);
}
}

40
Ryujinx.Graphics.Shader/CodeGen/Glsl/GlslGenerator.cs
View file

@ -49,46 +49,6 @@ namespace Ryujinx.Graphics.Shader.CodeGen.Glsl
Declarations.DeclareLocals(context, function);
if (funcName == MainFunctionName)
{
// Some games will leave some elements of gl_Position uninitialized,
// in those cases, the elements will contain undefined values according
// to the spec, but on NVIDIA they seems to be always initialized to (0, 0, 0, 1),
// so we do explicit initialization to avoid UB on non-NVIDIA gpus.
if (context.Config.Stage == ShaderStage.Vertex)
{
context.AppendLine("gl_Position = vec4(0.0, 0.0, 0.0, 1.0);");
}
// Ensure that unused attributes are set, otherwise the downstream
// compiler may eliminate them.
// (Not needed for fragment shader as it is the last stage).
if (context.Config.Stage != ShaderStage.Compute &&
context.Config.Stage != ShaderStage.Fragment &&
!context.Config.GpPassthrough)
{
for (int attr = 0; attr < Declarations.MaxAttributes; attr++)
{
if (info.OAttributes.Contains(attr))
{
continue;
}
if ((context.Config.Options.Flags & TranslationFlags.Feedback) != 0)
{
context.AppendLine($"{DefaultNames.OAttributePrefix}{attr}_x = 0.0;");
context.AppendLine($"{DefaultNames.OAttributePrefix}{attr}_y = 0.0;");
context.AppendLine($"{DefaultNames.OAttributePrefix}{attr}_z = 0.0;");
context.AppendLine($"{DefaultNames.OAttributePrefix}{attr}_w = 1.0;");
}
else
{
context.AppendLine($"{DefaultNames.OAttributePrefix}{attr} = vec4(0.0, 0.0, 0.0, 1.0);");
}
}
}
}
PrintBlock(context, function.MainBlock);
context.LeaveScope();