private static void Generate(CodeGenContext context, StructuredProgramInfo info, int funcIndex)
{
var function = info.Functions[funcIndex];
(_, var spvFunc) = context.GetFunction(funcIndex);
context.AddFunction(spvFunc);
context.StartFunction();
Declarations.DeclareParameters(context, function);
context.EnterBlock(function.MainBlock);
Declarations.DeclareLocals(context, function);
Declarations.DeclareLocalForArgs(context, info.Functions);
Generate(context, function.MainBlock);
// Functions must always end with a return.
if (!(function.MainBlock.Last is AstOperation operation) ||
(operation.Inst != Instruction.Return && operation.Inst != Instruction.Discard))
{
context.Return();
}
context.FunctionEnd();
if (funcIndex == 0)
{
context.AddEntryPoint(context.Config.Stage.Convert(), spvFunc, "main", context.GetMainInterface());
if (context.Config.Stage == ShaderStage.TessellationControl)
{
context.AddExecutionMode(spvFunc, ExecutionMode.OutputVertices, (SpvLiteralInteger)context.Config.ThreadsPerInputPrimitive);
}
else if (context.Config.Stage == ShaderStage.TessellationEvaluation)
{
switch (context.Config.GpuAccessor.QueryTessPatchType())
{
case TessPatchType.Isolines:
context.AddExecutionMode(spvFunc, ExecutionMode.Isolines);
break;
case TessPatchType.Triangles:
context.AddExecutionMode(spvFunc, ExecutionMode.Triangles);
break;
case TessPatchType.Quads:
context.AddExecutionMode(spvFunc, ExecutionMode.Quads);
break;
}
switch (context.Config.GpuAccessor.QueryTessSpacing())
{
case TessSpacing.EqualSpacing:
context.AddExecutionMode(spvFunc, ExecutionMode.SpacingEqual);
break;
case TessSpacing.FractionalEventSpacing:
context.AddExecutionMode(spvFunc, ExecutionMode.SpacingFractionalEven);
break;
case TessSpacing.FractionalOddSpacing:
context.AddExecutionMode(spvFunc, ExecutionMode.SpacingFractionalOdd);
break;
}
if (context.Config.GpuAccessor.QueryTessCw())
{
context.AddExecutionMode(spvFunc, ExecutionMode.VertexOrderCw);
}
else
{
context.AddExecutionMode(spvFunc, ExecutionMode.VertexOrderCcw);
}
}
else if (context.Config.Stage == ShaderStage.Geometry)
{
InputTopology inputTopology = context.Config.GpuAccessor.QueryPrimitiveTopology();
context.AddExecutionMode(spvFunc, inputTopology switch
{
InputTopology.Points => ExecutionMode.InputPoints,
InputTopology.Lines => ExecutionMode.InputLines,
InputTopology.LinesAdjacency => ExecutionMode.InputLinesAdjacency,
InputTopology.Triangles => ExecutionMode.Triangles,
InputTopology.TrianglesAdjacency => ExecutionMode.InputTrianglesAdjacency,
_ => throw new InvalidOperationException($"Invalid input topology \"{inputTopology}\".")
});
