+ir_function_signature *
+builtin_builder::_interpolateAtCentroid(const glsl_type *type)
+{
+ ir_variable *interpolant = in_var(type, "interpolant");
+ interpolant->data.must_be_shader_input = 1;
+ MAKE_SIG(type, fs_gpu_shader5, 1, interpolant);
+
+ body.emit(ret(interpolate_at_centroid(interpolant)));
+
+ return sig;
+}
+
+ir_function_signature *
+builtin_builder::_interpolateAtOffset(const glsl_type *type)
+{
+ ir_variable *interpolant = in_var(type, "interpolant");
+ interpolant->data.must_be_shader_input = 1;
+ ir_variable *offset = in_var(glsl_type::vec2_type, "offset");
+ MAKE_SIG(type, fs_gpu_shader5, 2, interpolant, offset);
+
+ body.emit(ret(interpolate_at_offset(interpolant, offset)));
+
+ return sig;
+}
+
+ir_function_signature *
+builtin_builder::_interpolateAtSample(const glsl_type *type)
+{
+ ir_variable *interpolant = in_var(type, "interpolant");
+ interpolant->data.must_be_shader_input = 1;
+ ir_variable *sample_num = in_var(glsl_type::int_type, "sample_num");
+ MAKE_SIG(type, fs_gpu_shader5, 2, interpolant, sample_num);
+
+ body.emit(ret(interpolate_at_sample(interpolant, sample_num)));
+
+ return sig;
+}
+