glReadPixels (GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, GLvoid *pixels);glReadPixels (GLint x, GLint y, GLsizei width,
glReadPixels (GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, GLvoid *pixels);glReadPixels (GLint x, GLint y, GLsizei width,