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Implement VMNMX shader instruction (#1032)

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* Implement VMNMX shader instruction

* No need for the gap on the enum

* Fix typo
This commit is contained in:
gdkchan 2020-03-25 11:49:10 -03:00 • committed by GitHub
parent 56374c8633
commit 1586450a38
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5 changed files with 232 additions and 4 deletions
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121
Ryujinx.Graphics.Shader/Instructions/InstEmitVideo.cs
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@ -1,17 +1,136 @@
using Ryujinx.Graphics.Shader.Decoders;
using Ryujinx.Graphics.Shader.IntermediateRepresentation;
using Ryujinx.Graphics.Shader.Translation;
using static Ryujinx.Graphics.Shader.Instructions.InstEmitHelper;
using static Ryujinx.Graphics.Shader.IntermediateRepresentation.OperandHelper;
namespace Ryujinx.Graphics.Shader.Instructions
{
static partial class InstEmit
{
public static void Vmad(EmitterContext context)
{
// TODO: Implement properly.
context.Copy(GetDest(context), GetSrcC(context));
}
public static void Vmnmx(EmitterContext context)
{
OpCodeVideo op = (OpCodeVideo)context.CurrOp;
context.Copy(GetDest(context), GetSrcC(context));
bool max = op.RawOpCode.Extract(56);
Operand srcA = Extend(context, GetSrcA(context), op.RaSelection, op.RaType);
Operand srcC = GetSrcC(context);
Operand srcB;
if (op.HasRb)
{
srcB = Extend(context, Register(op.Rb), op.RbSelection, op.RbType);
}
else
{
srcB = Const(op.Immediate);
}
Operand res;
bool resSigned;
if ((op.RaType & VideoType.Signed) != (op.RbType & VideoType.Signed))
{
// Signedness is different, but for max, result will always fit a U32,
// since one of the inputs can't be negative, and the result is the one
// with highest value. For min, it will always fit on a S32, since
// one of the input can't be greater than INT_MAX and we want the lowest value.
resSigned = !max;
res = max ? context.IMaximumU32(srcA, srcB) : context.IMinimumS32(srcA, srcB);
if ((op.RaType & VideoType.Signed) != 0)
{
Operand isBGtIntMax = context.ICompareLess(srcB, Const(0));
res = context.ConditionalSelect(isBGtIntMax, srcB, res);
}
else
{
Operand isAGtIntMax = context.ICompareLess(srcA, Const(0));
res = context.ConditionalSelect(isAGtIntMax, srcA, res);
}
}
else
{
// Ra and Rb have the same signedness, so doesn't matter which one we test.
resSigned = (op.RaType & VideoType.Signed) != 0;
if (max)
{
res = resSigned
? context.IMaximumS32(srcA, srcB)
: context.IMaximumU32(srcA, srcB);
}
else
{
res = resSigned
? context.IMinimumS32(srcA, srcB)
: context.IMinimumU32(srcA, srcB);
}
}
if (op.Saturate)
{
if (op.DstSigned && !resSigned)
{
res = context.IMinimumU32(res, Const(int.MaxValue));
}
else if (!op.DstSigned && resSigned)
{
res = context.IMaximumS32(res, Const(0));
}
}
switch (op.PostOp)
{
case VideoPostOp.Acc:
res = context.IAdd(res, srcC);
break;
case VideoPostOp.Max:
res = op.DstSigned ? context.IMaximumS32(res, srcC) : context.IMaximumU32(res, srcC);
break;
case VideoPostOp.Min:
res = op.DstSigned ? context.IMinimumS32(res, srcC) : context.IMinimumU32(res, srcC);
break;
case VideoPostOp.Mrg16h:
res = context.BitfieldInsert(srcC, res, Const(16), Const(16));
break;
case VideoPostOp.Mrg16l:
res = context.BitfieldInsert(srcC, res, Const(0), Const(16));
break;
case VideoPostOp.Mrg8b0:
res = context.BitfieldInsert(srcC, res, Const(0), Const(8));
break;
case VideoPostOp.Mrg8b2:
res = context.BitfieldInsert(srcC, res, Const(16), Const(8));
break;
}
context.Copy(GetDest(context), res);
}
private static Operand Extend(EmitterContext context, Operand src, int sel, VideoType type)
{
return type switch
{
VideoType.U8 => ZeroExtendTo32(context, context.ShiftRightU32(src, Const(sel * 8)), 8),
VideoType.U16 => ZeroExtendTo32(context, context.ShiftRightU32(src, Const(sel * 16)), 16),
VideoType.S8 => SignExtendTo32(context, context.ShiftRightU32(src, Const(sel * 8)), 8),
VideoType.S16 => SignExtendTo32(context, context.ShiftRightU32(src, Const(sel * 16)), 16),
_ => src
};
}
}
}