public static string ToHlsl(this SourceDescription desc)
{
var s = new StringBuilder();
// define uniforms
desc.Uniforms.ForEach(
v =>
{
var typ = v.Type.ToHlsl();
if (v.IsSampler() && v.DefaultRegister.HasValue)
{
// allocate a register for it
s.AppendFormat("uniform extern {0} {1} : register(s{3});{2}", typ, v.Name, v.Comment, v.DefaultRegister.Value).Append(Environment.NewLine);
}
else
{
s.AppendFormat("uniform extern {0} {1};{2}", typ, v.Name, v.Comment).Append(Environment.NewLine);
}
});
// expose varyings inputs and outputs as globals for unified access
// through all functions
var statics = desc.Varyings.Concat(desc.VertexIns).Concat(desc.FragmentOuts);
foreach (var v in statics)
{
s.AppendFormat("static {0} {1};{2}", v.Type.ToHlsl(), v.Name, v.Comment).Append(Environment.NewLine);
}
s.AppendLine();
var vmain = desc.VertexMain();
var fmain = desc.FragmentMain();
desc.ForwardDecl.ForEach(v => s.AppendLine(v));
s.AppendLine();
desc.Functions.ForEach(v => s.AppendLine(v.Body));
// generate vertex input struct
if (vmain != null)
{
s.AppendLine("struct SLSharp_VertexIn");
s.AppendLine("{");
desc.VertexIns.ForEach(
v => s.AppendFormat(" {0} {1}: {2};", v.Type.ToHlsl(), v.Name, v.Semantic.ToHlsl()).AppendLine());
s.AppendLine("};");
s.AppendLine();
s.AppendLine("struct SLSharp_VertexOut");
s.AppendLine("{");
GenerateVaryingStruct(s, desc);
s.AppendLine("};");
s.AppendLine();
s.AppendLine("SLSharp_VertexOut SLSharp_VertexMain(SLSharp_VertexIn input)");
s.AppendLine("{");
s.AppendLine(" SLSharp_VertexOut output;");
// initialize globals from input
desc.VertexIns.ForEach(v => s.AppendFormat(" {0} = input.{1};", v.Name, v.Name).AppendLine());
// call entrypoint
s.AppendFormat(" {0}();", vmain.Name).AppendLine();
// write back results from globals
desc.Varyings.ForEach(v => s.AppendFormat(" output.{0} = {1};", v.Name, v.Name).AppendLine());
s.AppendLine(" return output;");
s.AppendLine("}");
}
if (fmain != null)
{
s.AppendLine("struct SLSharp_FragmentIn");
s.AppendLine("{");
GenerateVaryingStruct(s, desc);
s.AppendLine("};");
s.AppendLine();
s.AppendLine("struct SLSharp_FragmentOut");
s.AppendLine("{");
desc.FragmentOuts.ForEach(
v => s.AppendFormat(" {0} {1}: {2};", v.Type.ToHlsl(), v.Name, v.Semantic.ToHlsl()).AppendLine());
s.AppendLine("};");
s.AppendLine();
s.AppendLine("SLSharp_FragmentOut SLSharp_FragmentMain(SLSharp_FragmentIn input)");
s.AppendLine("{");
s.AppendLine(" SLSharp_FragmentOut output;");
// initialize globals from input
desc.Varyings.ForEach(v => s.AppendFormat(" {0} = input.{1};", v.Name, v.Name).AppendLine());
// call entrypoint
s.AppendFormat(" {0}();", fmain.Name).AppendLine();
// write back results from globals
desc.FragmentOuts.ForEach(v => s.AppendFormat(" output.{0} = {1};", v.Name, v.Name).AppendLine());
s.AppendLine(" return output;");
s.AppendLine("}");
}
return(s.ToString());
}
