internal StageValue ProcessStageChange(StageValue s, MetaStage fromStage, MetaStage toStage, MetaLocation loc, MetaProperty mp)
{
if (s.Value == null)
{
return(new StageValue(null, toStage));
}
if (s.MinStage > fromStage)
{
Log.Error(s.Value.Source, ErrorCode.I5016, "Stage error");
return(new StageValue(Expression.Invalid, toStage));
}
switch (toStage)
{
case MetaStage.Pixel:
case MetaStage.Vertex:
if (fromStage == MetaStage.Vertex && toStage == MetaStage.Pixel)
{
// Vertex -> Pixel: Varying
var key = s.Value.ToString();
int index;
if (!Varyings.TryGetValue(key, out index))
{
index = DrawState.Varyings.Count;
DrawState.Varyings.Add(new ShaderVariable(s.Value.ReturnType, CreateShaderName(mp, loc, s.Value), s.Value));
Varyings.Add(key, index);
}
return(new StageValue(new LoadVarying(s.Value.Source, DrawState, index), MetaStage.Pixel, MetaStage.Pixel));
}
else if (s.Value.ReturnType == Essentials.Bool || s.Value.ReturnType == Essentials.Int)
{
return(ProcessShaderConstant(s, loc, mp));
}
else
{
// Init,Frame -> Vertex,Pixel: Uniform
s = ProcessStage(s, MetaStage.Volatile, MetaStage.Volatile);
var val = s.Value.ActualValue;
var dt = val.ReturnType;
var key = val.ToString();
int index;
if (!Uniforms.TryGetValue(key, out index))
{
index = DrawState.Uniforms.Count;
switch (dt.TypeType)
{
case TypeType.FixedArray:
// Ugly workaround. ResolvedMetaPropertyValue could already be an address
if (!(val is PlaceholderValue && (val as PlaceholderValue).Value is AddressOf))
{
val = new AddressOf(val.ActualValue, AddressType.Const);
}
break;
case TypeType.RefArray:
var at = dt as RefArrayType;
var et = at.ElementType;
var size = ProcessShaderConstant(
new StageValue(ILFactory.GetProperty(s.Value.Source, s.Value, "Length"), s.MinStage, s.MaxStage),
loc, mp).Value;
dt = new FixedArrayType(s.Value.Source, et, size, Essentials.Int);
break;
}
DrawState.Uniforms.Add(new ShaderVariable(dt, CreateShaderName(mp, loc, val), val));
Uniforms.Add(key, index);
}
Expression u = new LoadUniform(s.Value.Source, DrawState, index);
if (u.ReturnType.IsFixedArray)
{
u = new AddressOf(u, AddressType.Const);
}
return(new StageValue(u, MetaStage.Vertex, MetaStage.Pixel));
}
case MetaStage.Volatile:
if (fromStage <= MetaStage.ReadOnly)
{
// Init -> Frame: Field
var src = s.Value.Source;
var dt = Path.DrawBlock.Method.DeclaringType;
var obj = new This(src, dt).Address;
var key = s.Value.ToString();
Field field;
if (!Fields.TryGetValue(key, out field))
{
for (int i = 0; i < InitScope.Statements.Count; i++)
{
if (InitScope.Statements[i] is StoreField)
{
var sf = InitScope.Statements[i] as StoreField;
if (sf.Field.ReturnType.Equals(s.Value.ReturnType) && sf.Value.ToString() == key)
{
field = sf.Field;
}
}
}
if (field == null)
{
field = new Field(src, dt, CreateFieldName(mp, loc, s.Value),
null, Modifiers.Private | Modifiers.Generated, 0, s.Value.ReturnType);
dt.Fields.Add(field);
InitScope.Statements.Add(new StoreField(src, obj, field, s.Value));
}
Fields.Add(key, field);
}
return(new StageValue(new LoadField(src, obj, field), MetaStage.ReadOnly, MetaStage.Volatile));
}
break;
case MetaStage.ReadOnly:
return(s);
}
Log.Error(s.Value.Source, ErrorCode.E5017, fromStage.ToLiteral().Quote() + " cannot be accessed from " + toStage.ToLiteral() + " stage while processing " + mp.Name.Quote() + " at " + mp.Source + " in " + Path.Quote() + " at " + Path.Source);
return(new StageValue(Expression.Invalid, MetaStage.Const));
}