glViewport function opengl
GLAPI void GLAPIENTRY glViewport( GLint x, GLint y, GLsizei width, GLsizei height )
Implementation
void glViewport(int x, int y, int width, int height) {
  final glViewportAsFunction = _glViewport
      .cast<
        NativeFunction<
          Void Function(Int32 x, Int32 y, Uint32 width, Uint32 height)
        >
      >()
      .asFunction<void Function(int x, int y, int width, int height)>();
  return glViewportAsFunction(x, y, width, height);
}