private void WriteAst(HlslAst ast)
{
var compiler = new NodeCompiler(_registers);
var rootGroups = ast.Roots.GroupBy(r => r.Key.RegisterKey);
if (_registers.MethodOutputRegisters.Count == 1)
{
var rootGroup = rootGroups.Single();
var registerKey = rootGroup.Key;
var roots = rootGroup.OrderBy(r => r.Key.ComponentIndex).Select(r => r.Value).ToList();
string statement = compiler.Compile(roots, 4);
WriteLine($"return {statement};");
}
else
{
foreach (var rootGroup in rootGroups)
{
var registerKey = rootGroup.Key;
var roots = rootGroup.OrderBy(r => r.Key.ComponentIndex).Select(r => r.Value).ToList();
RegisterDeclaration outputRegister = _registers.MethodOutputRegisters[registerKey];
string statement = compiler.Compile(roots, roots.Count);
WriteLine($"o.{outputRegister.Name} = {statement};");
}
WriteLine();
WriteLine($"return o;");
}
}
private void WriteAst(HlslAst ast)
{
var compiler = new NodeCompiler(_registers);
foreach (var rootGroup in ast.NoOutputInstructions)
{
string statement = compiler.Compile(rootGroup.Value);
WriteLine($"{statement};");
}
if (ast.Roots.Count == 1)
{
string statement = compiler.Compile(ast.Roots.Single().Value);
WriteLine($"return {statement};");
}
else
{
foreach (var rootGroup in ast.Roots)
{
RegisterDeclaration outputRegister = _registers.MethodOutputRegisters[rootGroup.Key];
string statement = compiler.Compile(rootGroup.Value);
WriteLine($"o.{outputRegister.Name} = {statement};");
}
WriteLine();
WriteLine($"return o;");
}
}
int GetRegisterFullLength(RegisterDeclaration decl)
{
if (decl != null)
{
switch (decl.TypeName)
{
case "float":
return(1);
case "float2":
return(2);
case "float3":
return(3);
}
}
return(4);
}
public void Write(string hlslFilename)
{
hlslFile = new FileStream(hlslFilename, FileMode.Create, FileAccess.Write);
hlslWriter = new StreamWriter(hlslFile);
ConstantDefinitions = new List <Constant>();
ConstantIntDefinitions = new List <ConstantInt>();
// Look for dcl instructions
RegisterDeclarations = new List <RegisterDeclaration>();
foreach (var declInstruction in shader.Instructions.Where(x => x.Opcode == Opcode.Dcl))
{
var decl = new RegisterDeclaration(declInstruction);
RegisterDeclarations.Add(decl);
}
// Look for and parse the constant table
ConstantDeclarations = shader.ParseConstantTable();
foreach (ConstantDeclaration declaration in ConstantDeclarations)
{
string typeName = GetTypeName(declaration);
WriteLine("{0} {1};", typeName, declaration.Name);
}
if (ConstantDeclarations.Count != 0)
{
WriteLine();
}
string methodTypeName;
string methodParamList = "";
string methodSemantic = "";
// Create the input structure
var dclInputs = RegisterDeclarations.Where(x => x.RegisterType == RegisterType.Input || x.RegisterType == RegisterType.MiscType);
numInputs = dclInputs.Count();
if (numInputs == 0)
{
System.Diagnostics.Debug.Assert(shader.Type == ShaderType.Pixel);
}
else if (numInputs == 1)
{
var dclInput = dclInputs.Single();
methodParamList = string.Format("{0} {1} : {2}",
dclInput.TypeName, dclInput.Name, dclInput.Semantic);
}
else
{
if (shader.Type == ShaderType.Pixel)
{
methodParamList = "VS_OUT i";
WriteLine("struct VS_OUT");
}
else
{
methodParamList = "VS_IN i";
WriteLine("struct VS_IN");
}
WriteLine("{");
indent = "\t";
foreach (var dclInput in dclInputs)
{
WriteLine("{0} {1} : {2};",
dclInput.TypeName, dclInput.Name, dclInput.Semantic);
}
indent = "";
WriteLine("};");
WriteLine();
}
// Create the output structure
if (shader.Type == ShaderType.Vertex)
{
var dclOutputs = RegisterDeclarations.Where(x => x.RegisterType == RegisterType.Output || x.RegisterType == RegisterType.ColorOut);
numOutputs = dclOutputs.Count();
if (numOutputs == 1)
{
var dclOutput = dclOutputs.Single();
methodTypeName = dclOutput.TypeName;
methodSemantic = " : " + dclOutput.Semantic;
}
else
{
methodTypeName = "VS_OUT";
WriteLine("struct VS_OUT");
WriteLine("{");
indent = "\t";
foreach (var dclOutput in dclOutputs)
{
WriteLine("{0} {1} : {2};",
dclOutput.TypeName, dclOutput.Name, dclOutput.Semantic);
}
indent = "";
WriteLine("};");
WriteLine();
}
}
else
{
// Find all assignments to pixel shader color outputs.
Dictionary <string, int> colorRegisters = new Dictionary <string, int>();
foreach (Instruction instruction in shader.Instructions)
{
if (!instruction.HasDestination)
{
continue;
}
int destIndex = instruction.GetDestinationParamIndex();
if (instruction.GetParamRegisterType(destIndex) == RegisterType.ColorOut)
{
string registerName = "oC" + instruction.GetParamRegisterNumber(destIndex).ToString();
if (!colorRegisters.ContainsKey(registerName))
{
colorRegisters.Add(registerName, 0);
}
}
}
if (colorRegisters.Count > 1)
{
methodTypeName = "PS_OUT";
WriteLine("struct PS_OUT");
}
else
{
methodTypeName = "float4";
methodSemantic = " : COLOR";
}
}
WriteLine("{0} main({1}){2}", methodTypeName, methodParamList, methodSemantic);
WriteLine("{");
indent = "\t";
HlslAst ast = null;
if (doAstAnalysis)
{
var parser = new BytecodeParser();
ast = parser.Parse(shader);
ast.ReduceTree();
}
if (ast != null)
{
WriteAst(ast);
}
else
{
WriteLine("{0} o;", methodTypeName);
WriteLine();
// Find all assignments to temporary variables
// and declare the variables.
var tempRegisters = new Dictionary <string, int>();
foreach (Instruction instruction in shader.Instructions)
{
if (!instruction.HasDestination)
{
continue;
}
int destIndex = instruction.GetDestinationParamIndex();
if (instruction.GetParamRegisterType(destIndex) == RegisterType.Temp)
{
string registerName = instruction.GetParamRegisterName(destIndex);
if (!tempRegisters.ContainsKey(registerName))
{
tempRegisters.Add(registerName, 0);
}
tempRegisters[registerName] |= instruction.GetDestinationWriteMask();
}
}
foreach (var registerName in tempRegisters.Keys)
{
int writeMask = tempRegisters[registerName];
string writeMaskName;
switch (writeMask)
{
case 0x1:
writeMaskName = "float";
break;
case 0x3:
writeMaskName = "float2";
break;
case 0x7:
writeMaskName = "float3";
break;
case 0xF:
writeMaskName = "float4";
break;
default:
// TODO
writeMaskName = "float4";
break;
//throw new NotImplementedException();
}
WriteLine("{0} {1};", writeMaskName, registerName);
}
foreach (Instruction instruction in shader.Instructions)
{
WriteInstruction(instruction);
}
WriteLine();
WriteLine("return o;");
}
indent = "";
WriteLine("}");
hlslWriter.Dispose();
hlslFile.Dispose();
}