SkSL::Constructor Namespace Reference

Functions
std::unique_ptr< Expression >	Convert (const Context &context, Position pos, const Type &type, ExpressionArray args)

Detailed Description

Converts any GLSL constructor, such as float2(x, y) or mat3x3(otherMat) or int[2](0, i), to an SkSL expression.

Vector constructors must always consist of either exactly 1 scalar, or a collection of vectors and scalars totaling exactly the right number of scalar components.

Matrix constructors must always consist of either exactly 1 scalar, exactly 1 matrix, or a collection of vectors and scalars totaling exactly the right number of scalar components.

Array constructors must always contain the proper number of array elements (matching the Type).

Function Documentation

Convert()

std::unique_ptr< Expression > SkSL::Constructor::Convert	(	const Context &	context,
		Position	pos,
		const Type &	type,
		ExpressionArray	args
	)

Definition at line 151 of file SkSLConstructor.cpp.

                                                                       {
    if (args.size() == 1 && args[0]->type().matches(type) && !type.componentType().isOpaque()) {
        // Don't generate redundant casts; if the expression is already of the correct type, just
        // return it as-is.
        args[0]->fPosition = pos;
        return std::move(args[0]);
    }
    if (type.isScalar()) {
        return ConstructorScalarCast::Convert(context, pos, type, std::move(args));
    }
    if (type.isVector() || type.isMatrix()) {
        return convert_compound_constructor(context, pos, type, std::move(args));
    }
    if (type.isArray() && type.columns() > 0) {
        return ConstructorArray::Convert(context, pos, type, std::move(args));
    }
    if (type.isStruct() && type.fields().size() > 0) {
        return ConstructorStruct::Convert(context, pos, type, std::move(args));
    }
 
    context.fErrors->error(pos, "cannot construct '" + type.displayName() + "'");
    return nullptr;
}