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using Ryujinx.Graphics.Shader.IntermediateRepresentation;
using static Ryujinx.Graphics.Shader.IntermediateRepresentation.OperandHelper;
namespace Ryujinx.Graphics.Shader.Translation
{
static class ShaderIdentifier
{
public static ShaderIdentification Identify(Function[] functions, ShaderConfig config)
{
if (config.Stage == ShaderStage.Geometry &&
config.GpuAccessor.QueryPrimitiveTopology() == InputTopology.Triangles &&
!config.GpuAccessor.QueryHostSupportsGeometryShader() &&
IsLayerPassthroughGeometryShader(functions, out int layerInputAttr))
{
config.SetGeometryShaderLayerInputAttribute(layerInputAttr);
return ShaderIdentification.GeometryLayerPassthrough;
}
return ShaderIdentification.None;
}
private static bool IsLayerPassthroughGeometryShader(Function[] functions, out int layerInputAttr)
{
bool writesLayer = false;
layerInputAttr = 0;
if (functions.Length != 1)
{
return false;
}
int verticesCount = 0;
int totalVerticesCount = 0;
foreach (BasicBlock block in functions[0].Blocks)
{
// We are not expecting loops or any complex control flow here, so fail in those cases.
if (block.Branch != null && block.Branch.Index <= block.Index)
{
return false;
}
foreach (INode node in block.Operations)
{
if (!(node is Operation operation))
{
continue;
}
if (IsResourceWrite(operation.Inst))
{
return false;
}
if (operation.Inst == Instruction.StoreAttribute)
{
return false;
}
if (operation.Inst == Instruction.Copy && operation.Dest.Type == OperandType.Attribute)
{
Operand src = operation.GetSource(0);
if (src.Type == OperandType.LocalVariable && src.AsgOp is Operation asgOp && asgOp.Inst == Instruction.LoadAttribute)
{
src = Attribute(asgOp.GetSource(0).Value);
}
if (src.Type == OperandType.Attribute)
{
if (operation.Dest.Value == AttributeConsts.Layer)
{
if ((src.Value & AttributeConsts.LoadOutputMask) != 0)
{
return false;
}
writesLayer = true;
layerInputAttr = src.Value;
}
else if (src.Value != operation.Dest.Value)
{
return false;
}
}
else if (src.Type == OperandType.Constant)
{
int dstComponent = (operation.Dest.Value >> 2) & 3;
float expectedValue = dstComponent == 3 ? 1f : 0f;
if (src.AsFloat() != expectedValue)
{
return false;
}
}
else
{
return false;
}
}
else if (operation.Inst == Instruction.EmitVertex)
{
verticesCount++;
}
else if (operation.Inst == Instruction.EndPrimitive)
{
totalVerticesCount += verticesCount;
verticesCount = 0;
}
}
}
return totalVerticesCount + verticesCount == 3 && writesLayer;
}
private static bool IsResourceWrite(Instruction inst)
{
switch (inst)
{
case Instruction.AtomicAdd:
case Instruction.AtomicAnd:
case Instruction.AtomicCompareAndSwap:
case Instruction.AtomicMaxS32:
case Instruction.AtomicMaxU32:
case Instruction.AtomicMinS32:
case Instruction.AtomicMinU32:
case Instruction.AtomicOr:
case Instruction.AtomicSwap:
case Instruction.AtomicXor:
case Instruction.ImageAtomic:
case Instruction.ImageStore:
case Instruction.StoreGlobal:
case Instruction.StoreGlobal16:
case Instruction.StoreGlobal8:
case Instruction.StoreStorage:
case Instruction.StoreStorage16:
case Instruction.StoreStorage8:
return true;
}
return false;
}
}
}
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