public Variable AddUniform(SSLParser.UniformVariableContext ctx, SSLVisitor vis)
{
var v = Variable.FromContext(ctx, vis);
var pre = FindGlobal(v.Name);
if (pre != null)
{
vis.Error(ctx, $"A variable with the name '{v.Name}' already exists in the global {v.Scope} context.");
}
_uniforms.Add(v.Name, v);
return(v);
}
internal static Variable FromContext(SSLParser.UniformVariableContext ctx, SSLVisitor vis)
{
var name = ctx.Name.Text;
if (name[0] == '$')
{
vis.Error(ctx, "Cannot start a variable with the character '$', this is reserved for built-in variables.");
}
if (name.Length > 32)
{
vis.Error(ctx, "Uniform names cannot be longer than 32 characters.");
}
var type = ReflectionUtils.TranslateTypeContext(ctx.type());
if (!type.HasValue)
{
vis.Error(ctx, $"Unable to convert variable '{name}' to internal type.");
}
if (type == ShaderType.Void)
{
vis.Error(ctx, $"The variable '{name}' cannot be of type 'void'.");
}
ImageFormat?ifmt = null;
uint? si = null;
if (type.Value.IsImageType())
{
if (ctx.Qualifier?.imageLayoutQualifier() == null)
{
vis.Error(ctx, "Storage image types must have a format qualifier.");
}
ifmt = ReflectionUtils.TranslateImageFormat(ctx.Qualifier.imageLayoutQualifier());
}
else if (type.Value.IsSubpassInput())
{
if (ctx.Qualifier?.INTEGER_LITERAL() == null)
{
vis.Error(ctx, "Subpass inputs must have an index qualifier.");
}
var pv = SSLVisitor.ParseIntegerLiteral(ctx.Qualifier.INTEGER_LITERAL().GetText(), out var isus, out var error);
if (!pv.HasValue)
{
vis.Error(ctx, error);
}
if (pv.Value < 0)
{
vis.Error(ctx, "Subpass input index cannot be less than 0.");
}
if (pv.Value > 255)
{
vis.Error(ctx, "Subpass input index cannot be greater than 255.");
}
si = (uint)pv.Value;
}
else
{
if (ctx.Qualifier?.imageLayoutQualifier() != null || ctx.Qualifier?.INTEGER_LITERAL() != null)
{
vis.Error(ctx, $"The handle type '{type}' cannot have qualifiers.");
}
}
return(new Variable(type.Value, name, VariableScope.Uniform, false, null, ifmt: ifmt, si: si));
}
