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using Ryujinx.Graphics.Shader.IntermediateRepresentation;
using System;
using System.Collections.Generic;
using static Ryujinx.Graphics.Shader.IntermediateRepresentation.OperandHelper;
namespace Ryujinx.Graphics.Shader.Translation
{
class HelperFunctionManager
{
private readonly List<Function> _functionList;
private readonly Dictionary<HelperFunctionName, int> _functionIds;
private readonly ShaderStage _stage;
public HelperFunctionManager(List<Function> functionList, ShaderStage stage)
{
_functionList = functionList;
_functionIds = new Dictionary<HelperFunctionName, int>();
_stage = stage;
}
public int AddFunction(Function function)
{
int functionId = _functionList.Count;
_functionList.Add(function);
return functionId;
}
public int GetOrCreateFunctionId(HelperFunctionName functionName)
{
if (_functionIds.TryGetValue(functionName, out int functionId))
{
return functionId;
}
Function function = GenerateFunction(functionName);
functionId = AddFunction(function);
_functionIds.Add(functionName, functionId);
return functionId;
}
private Function GenerateFunction(HelperFunctionName functionName)
{
return functionName switch
{
HelperFunctionName.ConvertDoubleToFloat => GenerateConvertDoubleToFloatFunction(),
HelperFunctionName.ConvertFloatToDouble => GenerateConvertFloatToDoubleFunction(),
HelperFunctionName.TexelFetchScale => GenerateTexelFetchScaleFunction(),
HelperFunctionName.TextureSizeUnscale => GenerateTextureSizeUnscaleFunction(),
_ => throw new ArgumentException($"Invalid function name {functionName}")
};
}
private Function GenerateConvertDoubleToFloatFunction()
{
EmitterContext context = new EmitterContext();
Operand valueLow = Argument(0);
Operand valueHigh = Argument(1);
Operand mantissaLow = context.BitwiseAnd(valueLow, Const(((1 << 22) - 1)));
Operand mantissa = context.ShiftRightU32(valueLow, Const(22));
mantissa = context.BitwiseOr(mantissa, context.ShiftLeft(context.BitwiseAnd(valueHigh, Const(0xfffff)), Const(10)));
mantissa = context.BitwiseOr(mantissa, context.ConditionalSelect(mantissaLow, Const(1), Const(0)));
Operand exp = context.BitwiseAnd(context.ShiftRightU32(valueHigh, Const(20)), Const(0x7ff));
Operand sign = context.ShiftRightS32(valueHigh, Const(31));
Operand resultSign = context.ShiftLeft(sign, Const(31));
Operand notZero = context.BitwiseOr(mantissa, exp);
Operand lblNotZero = Label();
context.BranchIfTrue(lblNotZero, notZero);
context.Return(resultSign);
context.MarkLabel(lblNotZero);
Operand notNaNOrInf = context.ICompareNotEqual(exp, Const(0x7ff));
mantissa = context.BitwiseOr(mantissa, Const(0x40000000));
exp = context.ISubtract(exp, Const(0x381));
// Note: Overflow cases are not handled here and might produce incorrect results.
Operand roundBits = context.BitwiseAnd(mantissa, Const(0x7f));
Operand roundBitsXor64 = context.BitwiseExclusiveOr(roundBits, Const(0x40));
mantissa = context.ShiftRightU32(context.IAdd(mantissa, Const(0x40)), Const(7));
mantissa = context.BitwiseAnd(mantissa, context.ConditionalSelect(roundBitsXor64, Const(~0), Const(~1)));
exp = context.ConditionalSelect(mantissa, exp, Const(0));
exp = context.ConditionalSelect(notNaNOrInf, exp, Const(0xff));
Operand result = context.IAdd(context.IAdd(mantissa, context.ShiftLeft(exp, Const(23))), resultSign);
context.Return(result);
return new Function(ControlFlowGraph.Create(context.GetOperations()).Blocks, "ConvertDoubleToFloat", true, 2, 0);
}
private Function GenerateConvertFloatToDoubleFunction()
{
EmitterContext context = new EmitterContext();
Operand value = Argument(0);
Operand mantissa = context.BitwiseAnd(value, Const(0x7fffff));
Operand exp = context.BitwiseAnd(context.ShiftRightU32(value, Const(23)), Const(0xff));
Operand sign = context.ShiftRightS32(value, Const(31));
Operand notNaNOrInf = context.ICompareNotEqual(exp, Const(0xff));
Operand expNotZero = context.ICompareNotEqual(exp, Const(0));
Operand notDenorm = context.BitwiseOr(expNotZero, context.ICompareEqual(mantissa, Const(0)));
exp = context.IAdd(exp, Const(0x380));
Operand shiftDist = context.ISubtract(Const(32), context.FindMSBU32(mantissa));
Operand normExp = context.ISubtract(context.ISubtract(Const(1), shiftDist), Const(1));
Operand normMant = context.ShiftLeft(mantissa, shiftDist);
exp = context.ConditionalSelect(notNaNOrInf, exp, Const(0x7ff));
exp = context.ConditionalSelect(notDenorm, exp, normExp);
mantissa = context.ConditionalSelect(expNotZero, mantissa, normMant);
Operand resultLow = context.ShiftLeft(mantissa, Const(29));
Operand resultHigh = context.ShiftRightU32(mantissa, Const(3));
resultHigh = context.IAdd(resultHigh, context.ShiftLeft(exp, Const(20)));
resultHigh = context.IAdd(resultHigh, context.ShiftLeft(sign, Const(31)));
context.Copy(Argument(1), resultLow);
context.Copy(Argument(2), resultHigh);
context.Return();
return new Function(ControlFlowGraph.Create(context.GetOperations()).Blocks, "ConvertFloatToDouble", false, 1, 2);
}
private Function GenerateTexelFetchScaleFunction()
{
EmitterContext context = new EmitterContext();
Operand input = Argument(0);
Operand samplerIndex = Argument(1);
Operand index = GetScaleIndex(context, samplerIndex);
Operand scale = context.Load(StorageKind.ConstantBuffer, 0, Const((int)SupportBufferField.RenderScale), index);
Operand scaleIsOne = context.FPCompareEqual(scale, ConstF(1f));
Operand lblScaleNotOne = Label();
context.BranchIfFalse(lblScaleNotOne, scaleIsOne);
context.Return(input);
context.MarkLabel(lblScaleNotOne);
int inArgumentsCount;
if (_stage == ShaderStage.Fragment)
{
Operand scaleIsLessThanZero = context.FPCompareLess(scale, ConstF(0f));
Operand lblScaleGreaterOrEqualZero = Label();
context.BranchIfFalse(lblScaleGreaterOrEqualZero, scaleIsLessThanZero);
Operand negScale = context.FPNegate(scale);
Operand inputScaled = context.FPMultiply(context.IConvertS32ToFP32(input), negScale);
Operand fragCoordX = context.Load(StorageKind.Input, IoVariable.FragmentCoord, null, Const(0));
Operand fragCoordY = context.Load(StorageKind.Input, IoVariable.FragmentCoord, null, Const(1));
Operand fragCoord = context.ConditionalSelect(Argument(2), fragCoordY, fragCoordX);
Operand inputBias = context.FPModulo(fragCoord, negScale);
Operand inputWithBias = context.FPAdd(inputScaled, inputBias);
context.Return(context.FP32ConvertToS32(inputWithBias));
context.MarkLabel(lblScaleGreaterOrEqualZero);
inArgumentsCount = 3;
}
else
{
inArgumentsCount = 2;
}
Operand inputScaled2 = context.FPMultiply(context.IConvertS32ToFP32(input), scale);
context.Return(context.FP32ConvertToS32(inputScaled2));
return new Function(ControlFlowGraph.Create(context.GetOperations()).Blocks, "TexelFetchScale", true, inArgumentsCount, 0);
}
private Function GenerateTextureSizeUnscaleFunction()
{
EmitterContext context = new EmitterContext();
Operand input = Argument(0);
Operand samplerIndex = Argument(1);
Operand index = GetScaleIndex(context, samplerIndex);
Operand scale = context.FPAbsolute(context.Load(StorageKind.ConstantBuffer, 0, Const((int)SupportBufferField.RenderScale), index));
Operand scaleIsOne = context.FPCompareEqual(scale, ConstF(1f));
Operand lblScaleNotOne = Label();
context.BranchIfFalse(lblScaleNotOne, scaleIsOne);
context.Return(input);
context.MarkLabel(lblScaleNotOne);
Operand inputUnscaled = context.FPDivide(context.IConvertS32ToFP32(input), scale);
context.Return(context.FP32ConvertToS32(inputUnscaled));
return new Function(ControlFlowGraph.Create(context.GetOperations()).Blocks, "TextureSizeUnscale", true, 2, 0);
}
private Operand GetScaleIndex(EmitterContext context, Operand index)
{
switch (_stage)
{
case ShaderStage.Vertex:
Operand fragScaleCount = context.Load(StorageKind.ConstantBuffer, 0, Const((int)SupportBufferField.FragmentRenderScaleCount));
return context.IAdd(Const(1), context.IAdd(index, fragScaleCount));
default:
return context.IAdd(Const(1), index);
}
}
}
}
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