private static void DeclareUniformBuffers(CodeGenContext context, BufferDescriptor[] descriptors)
{
if (descriptors.Length == 0)
{
return;
}
uint ubSize = Constants.ConstantBufferSize / 16;
var ubArrayType = context.TypeArray(context.TypeVector(context.TypeFP32(), 4), context.Constant(context.TypeU32(), ubSize), true);
context.Decorate(ubArrayType, Decoration.ArrayStride, (LiteralInteger)16);
var ubStructType = context.TypeStruct(true, ubArrayType);
context.Decorate(ubStructType, Decoration.Block);
context.MemberDecorate(ubStructType, 0, Decoration.Offset, (LiteralInteger)0);
if (context.Config.UsedFeatures.HasFlag(FeatureFlags.CbIndexing))
{
int count = descriptors.Max(x => x.Slot) + 1;
var ubStructArrayType = context.TypeArray(ubStructType, context.Constant(context.TypeU32(), count));
var ubPointerType = context.TypePointer(StorageClass.Uniform, ubStructArrayType);
var ubVariable = context.Variable(ubPointerType, StorageClass.Uniform);
context.Name(ubVariable, $"{GetStagePrefix(context.Config.Stage)}_u");
context.Decorate(ubVariable, Decoration.DescriptorSet, (LiteralInteger)0);
context.Decorate(ubVariable, Decoration.Binding, (LiteralInteger)context.Config.FirstConstantBufferBinding);
context.AddGlobalVariable(ubVariable);
context.UniformBuffersArray = ubVariable;
}
else
{
var ubPointerType = context.TypePointer(StorageClass.Uniform, ubStructType);
foreach (var descriptor in descriptors)
{
var ubVariable = context.Variable(ubPointerType, StorageClass.Uniform);
context.Name(ubVariable, $"{GetStagePrefix(context.Config.Stage)}_c{descriptor.Slot}");
context.Decorate(ubVariable, Decoration.DescriptorSet, (LiteralInteger)0);
context.Decorate(ubVariable, Decoration.Binding, (LiteralInteger)descriptor.Binding);
context.AddGlobalVariable(ubVariable);
context.UniformBuffers.Add(descriptor.Slot, ubVariable);
}
}
}
private static void DeclareUniformBuffers(CodeGenContext context, BufferDescriptor[] descriptors)
{
uint ubSize = Constants.ConstantBufferSize / 16;
var ubArrayType = context.TypeArray(context.TypeVector(context.TypeFP32(), 4), context.Constant(context.TypeU32(), ubSize), true);
context.Decorate(ubArrayType, Decoration.ArrayStride, (LiteralInteger)16);
var ubStructType = context.TypeStruct(true, ubArrayType);
context.Decorate(ubStructType, Decoration.Block);
context.MemberDecorate(ubStructType, 0, Decoration.Offset, (LiteralInteger)0);
var ubPointerType = context.TypePointer(StorageClass.Uniform, ubStructType);
foreach (var descriptor in descriptors)
{
var ubVariable = context.Variable(ubPointerType, StorageClass.Uniform);
context.Name(ubVariable, $"{GetStagePrefix(context.Config.Stage)}_c{descriptor.Slot}");
context.Decorate(ubVariable, Decoration.DescriptorSet, (LiteralInteger)0);
context.Decorate(ubVariable, Decoration.Binding, (LiteralInteger)descriptor.Binding);
context.AddGlobalVariable(ubVariable);
context.UniformBuffers.Add(descriptor.Slot, ubVariable);
}
}
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));
}
}
