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}\".") });