public static void DeclareParameters(CodeGenContext context, StructuredFunction function)
{
DeclareParameters(context, function.InArguments, 0);
DeclareParameters(context, function.OutArguments, function.InArguments.Length);
}
private static void DeclareSharedMemory(CodeGenContext context, int size)
{
context.SharedMemory = DeclareMemory(context, StorageClass.Workgroup, size);
}
private static void DeclareLocalMemory(CodeGenContext context, int size)
{
context.LocalMemory = DeclareMemory(context, StorageClass.Private, size);
}
public static byte[] Generate(StructuredProgramInfo info, ShaderConfig config)
{
SpvInstructionPool instPool;
SpvLiteralIntegerPool integerPool;
lock (PoolLock)
{
instPool = InstructionPool.Allocate();
integerPool = IntegerPool.Allocate();
}
CodeGenContext context = new CodeGenContext(info, config, instPool, integerPool);
context.AddCapability(Capability.GroupNonUniformBallot);
context.AddCapability(Capability.ImageBuffer);
context.AddCapability(Capability.ImageGatherExtended);
context.AddCapability(Capability.ImageQuery);
context.AddCapability(Capability.SampledBuffer);
context.AddCapability(Capability.SubgroupBallotKHR);
context.AddCapability(Capability.SubgroupVoteKHR);
if (config.TransformFeedbackEnabled && config.LastInVertexPipeline)
{
context.AddCapability(Capability.TransformFeedback);
}
if (config.Stage == ShaderStage.Fragment && context.Config.GpuAccessor.QueryHostSupportsFragmentShaderInterlock())
{
context.AddCapability(Capability.FragmentShaderPixelInterlockEXT);
context.AddExtension("SPV_EXT_fragment_shader_interlock");
}
else if (config.Stage == ShaderStage.Geometry)
{
context.AddCapability(Capability.Geometry);
if (config.GpPassthrough && context.Config.GpuAccessor.QueryHostSupportsGeometryShaderPassthrough())
{
context.AddExtension("SPV_NV_geometry_shader_passthrough");
context.AddCapability(Capability.GeometryShaderPassthroughNV);
}
}
else if (config.Stage == ShaderStage.TessellationControl || config.Stage == ShaderStage.TessellationEvaluation)
{
context.AddCapability(Capability.Tessellation);
}
context.AddExtension("SPV_KHR_shader_ballot");
context.AddExtension("SPV_KHR_subgroup_vote");
Declarations.DeclareAll(context, info);
if ((info.HelperFunctionsMask & NeedsInvocationIdMask) != 0)
{
Declarations.DeclareInvocationId(context);
}
for (int funcIndex = 0; funcIndex < info.Functions.Count; funcIndex++)
{
var function = info.Functions[funcIndex];
var retType = context.GetType(function.ReturnType.Convert());
var funcArgs = new SpvInstruction[function.InArguments.Length + function.OutArguments.Length];
for (int argIndex = 0; argIndex < funcArgs.Length; argIndex++)
{
var argType = context.GetType(function.GetArgumentType(argIndex).Convert());
var argPointerType = context.TypePointer(StorageClass.Function, argType);
funcArgs[argIndex] = argPointerType;
}
var funcType = context.TypeFunction(retType, false, funcArgs);
var spvFunc = context.Function(retType, FunctionControlMask.MaskNone, funcType);
context.DeclareFunction(funcIndex, function, spvFunc);
}
for (int funcIndex = 0; funcIndex < info.Functions.Count; funcIndex++)
{
Generate(context, info, funcIndex);
}
byte[] result = context.Generate();
lock (PoolLock)
{
InstructionPool.Release(instPool);
IntegerPool.Release(integerPool);
}
return(result);
}
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}\".")
});
private static SpvInstruction ApplyScaling2D(CodeGenContext context, SpvInstruction vector, int index)
{
var pointerType = context.TypePointer(StorageClass.Uniform, context.TypeFP32());
var fieldIndex = context.Constant(context.TypeU32(), 4);
var scaleIndex = context.Constant(context.TypeU32(), index);
if (context.Config.Stage == ShaderStage.Vertex)
{
var scaleCountPointerType = context.TypePointer(StorageClass.Uniform, context.TypeS32());
var scaleCountElemPointer = context.AccessChain(scaleCountPointerType, context.SupportBuffer, context.Constant(context.TypeU32(), 3));
var scaleCount = context.Load(context.TypeS32(), scaleCountElemPointer);
scaleIndex = context.IAdd(context.TypeU32(), scaleIndex, scaleCount);
}
scaleIndex = context.IAdd(context.TypeU32(), scaleIndex, context.Constant(context.TypeU32(), 1));
var scaleElemPointer = context.AccessChain(pointerType, context.SupportBuffer, fieldIndex, scaleIndex);
var scale = context.Load(context.TypeFP32(), scaleElemPointer);
var ivector2Type = context.TypeVector(context.TypeS32(), 2);
var localVector = context.CoordTemp;
var passthrough = context.FOrdEqual(context.TypeBool(), scale, context.Constant(context.TypeFP32(), 1f));
var mergeLabel = context.Label();
if (context.Config.Stage == ShaderStage.Fragment)
{
var scaledInterpolatedLabel = context.Label();
var scaledNoInterpolationLabel = context.Label();
var needsInterpolation = context.FOrdLessThan(context.TypeBool(), scale, context.Constant(context.TypeFP32(), 0f));
context.SelectionMerge(mergeLabel, SelectionControlMask.MaskNone);
context.BranchConditional(needsInterpolation, scaledInterpolatedLabel, scaledNoInterpolationLabel);
// scale < 0.0
context.AddLabel(scaledInterpolatedLabel);
ApplyScalingInterpolated(context, localVector, vector, scale);
context.Branch(mergeLabel);
// scale >= 0.0
context.AddLabel(scaledNoInterpolationLabel);
ApplyScalingNoInterpolation(context, localVector, vector, scale);
context.Branch(mergeLabel);
context.AddLabel(mergeLabel);
var passthroughLabel = context.Label();
var finalMergeLabel = context.Label();
context.SelectionMerge(finalMergeLabel, SelectionControlMask.MaskNone);
context.BranchConditional(passthrough, passthroughLabel, finalMergeLabel);
context.AddLabel(passthroughLabel);
context.Store(localVector, vector);
context.Branch(finalMergeLabel);
context.AddLabel(finalMergeLabel);
return(context.Load(ivector2Type, localVector));
}
else
{
var passthroughLabel = context.Label();
var scaledLabel = context.Label();
context.SelectionMerge(mergeLabel, SelectionControlMask.MaskNone);
context.BranchConditional(passthrough, passthroughLabel, scaledLabel);
// scale == 1.0
context.AddLabel(passthroughLabel);
context.Store(localVector, vector);
context.Branch(mergeLabel);
// scale != 1.0
context.AddLabel(scaledLabel);
ApplyScalingNoInterpolation(context, localVector, vector, scale);
context.Branch(mergeLabel);
context.AddLabel(mergeLabel);
return(context.Load(ivector2Type, localVector));
}
}