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using Ryujinx.Graphics.Shader.CodeGen.Glsl.Instructions;
using Ryujinx.Graphics.Shader.StructuredIr;
using Ryujinx.Graphics.Shader.Translation;
using System;
using static Ryujinx.Graphics.Shader.CodeGen.Glsl.TypeConversion;
namespace Ryujinx.Graphics.Shader.CodeGen.Glsl
{
static class GlslGenerator
{
private const string MainFunctionName = "main";
public static string Generate(StructuredProgramInfo info, CodeGenParameters parameters)
{
CodeGenContext context = new(info, parameters);
Declarations.Declare(context, info);
if (info.Functions.Count != 0)
{
for (int i = 1; i < info.Functions.Count; i++)
{
context.AppendLine($"{GetFunctionSignature(context, info.Functions[i])};");
}
context.AppendLine();
for (int i = 1; i < info.Functions.Count; i++)
{
PrintFunction(context, info.Functions[i]);
context.AppendLine();
}
}
PrintFunction(context, info.Functions[0], MainFunctionName);
return context.GetCode();
}
private static void PrintFunction(CodeGenContext context, StructuredFunction function, string funcName = null)
{
context.CurrentFunction = function;
context.AppendLine(GetFunctionSignature(context, function, funcName));
context.EnterScope();
Declarations.DeclareLocals(context, function);
PrintBlock(context, function.MainBlock, funcName == MainFunctionName);
context.LeaveScope();
}
private static string GetFunctionSignature(CodeGenContext context, StructuredFunction function, string funcName = null)
{
string[] args = new string[function.InArguments.Length + function.OutArguments.Length];
for (int i = 0; i < function.InArguments.Length; i++)
{
args[i] = $"{Declarations.GetVarTypeName(context, function.InArguments[i])} {OperandManager.GetArgumentName(i)}";
}
for (int i = 0; i < function.OutArguments.Length; i++)
{
int j = i + function.InArguments.Length;
args[j] = $"out {Declarations.GetVarTypeName(context, function.OutArguments[i])} {OperandManager.GetArgumentName(j)}";
}
return $"{Declarations.GetVarTypeName(context, function.ReturnType)} {funcName ?? function.Name}({string.Join(", ", args)})";
}
private static void PrintBlock(CodeGenContext context, AstBlock block, bool isMainFunction)
{
AstBlockVisitor visitor = new(block);
visitor.BlockEntered += (sender, e) =>
{
switch (e.Block.Type)
{
case AstBlockType.DoWhile:
context.AppendLine("do");
break;
case AstBlockType.Else:
context.AppendLine("else");
break;
case AstBlockType.ElseIf:
context.AppendLine($"else if ({GetCondExpr(context, e.Block.Condition)})");
break;
case AstBlockType.If:
context.AppendLine($"if ({GetCondExpr(context, e.Block.Condition)})");
break;
default:
throw new InvalidOperationException($"Found unexpected block type \"{e.Block.Type}\".");
}
context.EnterScope();
};
visitor.BlockLeft += (sender, e) =>
{
context.LeaveScope();
if (e.Block.Type == AstBlockType.DoWhile)
{
context.AppendLine($"while ({GetCondExpr(context, e.Block.Condition)});");
}
};
bool supportsBarrierDivergence = context.HostCapabilities.SupportsShaderBarrierDivergence;
bool mayHaveReturned = false;
foreach (IAstNode node in visitor.Visit())
{
if (node is AstOperation operation)
{
if (!supportsBarrierDivergence)
{
if (operation.Inst == IntermediateRepresentation.Instruction.Barrier)
{
// Barrier on divergent control flow paths may cause the GPU to hang,
// so skip emitting the barrier for those cases.
if (visitor.Block.Type != AstBlockType.Main || mayHaveReturned || !isMainFunction)
{
context.Logger.Log("Shader has barrier on potentially divergent block, the barrier will be removed.");
continue;
}
}
else if (operation.Inst == IntermediateRepresentation.Instruction.Return)
{
mayHaveReturned = true;
}
}
string expr = InstGen.GetExpression(context, operation);
if (expr != null)
{
context.AppendLine(expr + ";");
}
}
else if (node is AstAssignment assignment)
{
AggregateType dstType = OperandManager.GetNodeDestType(context, assignment.Destination);
AggregateType srcType = OperandManager.GetNodeDestType(context, assignment.Source);
string dest = InstGen.GetExpression(context, assignment.Destination);
string src = ReinterpretCast(context, assignment.Source, srcType, dstType);
context.AppendLine(dest + " = " + src + ";");
}
else if (node is AstComment comment)
{
context.AppendLine("// " + comment.Comment);
}
else
{
throw new InvalidOperationException($"Found unexpected node type \"{node?.GetType().Name ?? "null"}\".");
}
}
}
private static string GetCondExpr(CodeGenContext context, IAstNode cond)
{
AggregateType srcType = OperandManager.GetNodeDestType(context, cond);
return ReinterpretCast(context, cond, srcType, AggregateType.Bool);
}
}
}
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