gldtShaderSource function
Implementation
void gldtShaderSource(int shader, String source) {
var utf8Pointer = calloc<Pointer<Utf8>>();
var utf8 = source.toNativeUtf8();
utf8Pointer.value = utf8;
glShaderSource(shader, 1, utf8Pointer, nullptr);
calloc.free(utf8Pointer);
calloc.free(utf8);
}