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using Ryujinx.Graphics.Shader.IntermediateRepresentation;
using System.Collections.Generic;
using static Ryujinx.Graphics.Shader.IntermediateRepresentation.OperandHelper;
namespace Ryujinx.Graphics.Shader.Translation.Transforms
{
class DrawParametersReplace : ITransformPass
{
public static bool IsEnabled(IGpuAccessor gpuAccessor, ShaderStage stage, TargetLanguage targetLanguage, FeatureFlags usedFeatures)
{
return stage == ShaderStage.Vertex;
}
public static LinkedListNode<INode> RunPass(TransformContext context, LinkedListNode<INode> node)
{
Operation operation = (Operation)node.Value;
if (context.GpuAccessor.QueryHasConstantBufferDrawParameters())
{
if (ReplaceConstantBufferWithDrawParameters(node, operation))
{
context.UsedFeatures |= FeatureFlags.DrawParameters;
}
}
else if (HasConstantBufferDrawParameters(operation))
{
context.UsedFeatures |= FeatureFlags.DrawParameters;
}
return node;
}
private static bool ReplaceConstantBufferWithDrawParameters(LinkedListNode<INode> node, Operation operation)
{
Operand GenerateLoad(IoVariable ioVariable)
{
Operand value = Local();
node.List.AddBefore(node, new Operation(Instruction.Load, StorageKind.Input, value, Const((int)ioVariable)));
return value;
}
bool modified = false;
for (int srcIndex = 0; srcIndex < operation.SourcesCount; srcIndex++)
{
Operand src = operation.GetSource(srcIndex);
if (src.Type == OperandType.ConstantBuffer && src.GetCbufSlot() == 0)
{
switch (src.GetCbufOffset())
{
case Constants.NvnBaseVertexByteOffset / 4:
operation.SetSource(srcIndex, GenerateLoad(IoVariable.BaseVertex));
modified = true;
break;
case Constants.NvnBaseInstanceByteOffset / 4:
operation.SetSource(srcIndex, GenerateLoad(IoVariable.BaseInstance));
modified = true;
break;
case Constants.NvnDrawIndexByteOffset / 4:
operation.SetSource(srcIndex, GenerateLoad(IoVariable.DrawIndex));
modified = true;
break;
}
}
}
return modified;
}
private static bool HasConstantBufferDrawParameters(Operation operation)
{
for (int srcIndex = 0; srcIndex < operation.SourcesCount; srcIndex++)
{
Operand src = operation.GetSource(srcIndex);
if (src.Type == OperandType.ConstantBuffer && src.GetCbufSlot() == 0)
{
switch (src.GetCbufOffset())
{
case Constants.NvnBaseVertexByteOffset / 4:
case Constants.NvnBaseInstanceByteOffset / 4:
case Constants.NvnDrawIndexByteOffset / 4:
return true;
}
}
}
return false;
}
}
}
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