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using Ryujinx.Graphics.Shader.IntermediateRepresentation;
using System;
using System.Collections.Generic;
namespace Ryujinx.Graphics.Shader.StructuredIr
{
static class StructuredProgram
{
public static StructuredProgramInfo MakeStructuredProgram(BasicBlock[] blocks)
{
PhiFunctions.Remove(blocks);
StructuredProgramContext context = new StructuredProgramContext(blocks.Length);
for (int blkIndex = 0; blkIndex < blocks.Length; blkIndex++)
{
BasicBlock block = blocks[blkIndex];
context.EnterBlock(block);
foreach (INode node in block.Operations)
{
Operation operation = (Operation)node;
if (IsBranchInst(operation.Inst))
{
context.LeaveBlock(block, operation);
}
else
{
AddOperation(context, operation);
}
}
}
GotoElimination.Eliminate(context.GetGotos());
AstOptimizer.Optimize(context.Info);
return context.Info;
}
private static void AddOperation(StructuredProgramContext context, Operation operation)
{
Instruction inst = operation.Inst;
IAstNode[] sources = new IAstNode[operation.SourcesCount];
for (int index = 0; index < sources.Length; index++)
{
sources[index] = context.GetOperandUse(operation.GetSource(index));
}
if (operation.Dest != null)
{
AstOperand dest = context.GetOperandDef(operation.Dest);
if (inst == Instruction.LoadConstant)
{
Operand ldcSource = operation.GetSource(0);
if (ldcSource.Type != OperandType.Constant)
{
throw new InvalidOperationException("Found LDC with non-constant constant buffer slot.");
}
context.Info.CBuffers.Add(ldcSource.Value);
}
AstAssignment assignment;
//If all the sources are bool, it's better to use short-circuiting
//logical operations, rather than forcing a cast to int and doing
//a bitwise operation with the value, as it is likely to be used as
//a bool in the end.
if (IsBitwiseInst(inst) && AreAllSourceTypesEqual(sources, VariableType.Bool))
{
inst = GetLogicalFromBitwiseInst(inst);
}
bool isCondSel = inst == Instruction.ConditionalSelect;
bool isCopy = inst == Instruction.Copy;
if (isCondSel || isCopy)
{
VariableType type = GetVarTypeFromUses(operation.Dest);
if (isCondSel && type == VariableType.F32)
{
inst |= Instruction.FP;
}
dest.VarType = type;
}
else
{
dest.VarType = InstructionInfo.GetDestVarType(inst);
}
int componentMask = 1 << operation.ComponentIndex;
IAstNode source;
if (operation is TextureOperation texOp)
{
AstTextureOperation astTexOp = new AstTextureOperation(
inst,
texOp.Type,
texOp.Flags,
texOp.Handle,
componentMask,
sources);
context.Info.Samplers.Add(astTexOp);
source = astTexOp;
}
else if (!isCopy)
{
source = new AstOperation(inst, componentMask, sources);
}
else
{
source = sources[0];
}
assignment = new AstAssignment(dest, source);
context.AddNode(assignment);
}
else
{
context.AddNode(new AstOperation(inst, sources));
}
}
private static VariableType GetVarTypeFromUses(Operand dest)
{
HashSet<Operand> visited = new HashSet<Operand>();
Queue<Operand> pending = new Queue<Operand>();
bool Enqueue(Operand operand)
{
if (visited.Add(operand))
{
pending.Enqueue(operand);
return true;
}
return false;
}
Enqueue(dest);
while (pending.TryDequeue(out Operand operand))
{
foreach (INode useNode in operand.UseOps)
{
if (!(useNode is Operation operation))
{
continue;
}
if (operation.Inst == Instruction.Copy)
{
if (operation.Dest.Type == OperandType.LocalVariable)
{
if (Enqueue(operation.Dest))
{
break;
}
}
else
{
return OperandInfo.GetVarType(operation.Dest.Type);
}
}
else
{
for (int index = 0; index < operation.SourcesCount; index++)
{
if (operation.GetSource(index) == operand)
{
return InstructionInfo.GetSrcVarType(operation.Inst, index);
}
}
}
}
}
return VariableType.S32;
}
private static bool AreAllSourceTypesEqual(IAstNode[] sources, VariableType type)
{
foreach (IAstNode node in sources)
{
if (!(node is AstOperand operand))
{
return false;
}
if (operand.VarType != type)
{
return false;
}
}
return true;
}
private static bool IsBranchInst(Instruction inst)
{
switch (inst)
{
case Instruction.Branch:
case Instruction.BranchIfFalse:
case Instruction.BranchIfTrue:
return true;
}
return false;
}
private static bool IsBitwiseInst(Instruction inst)
{
switch (inst)
{
case Instruction.BitwiseAnd:
case Instruction.BitwiseExclusiveOr:
case Instruction.BitwiseNot:
case Instruction.BitwiseOr:
return true;
}
return false;
}
private static Instruction GetLogicalFromBitwiseInst(Instruction inst)
{
switch (inst)
{
case Instruction.BitwiseAnd: return Instruction.LogicalAnd;
case Instruction.BitwiseExclusiveOr: return Instruction.LogicalExclusiveOr;
case Instruction.BitwiseNot: return Instruction.LogicalNot;
case Instruction.BitwiseOr: return Instruction.LogicalOr;
}
throw new ArgumentException($"Unexpected instruction \"{inst}\".");
}
}
}
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