Parameters pname Specifies the symbolic name of the pixel transfer parameter to be set.
Description glPixelTransfer sets pixel transfer modes that affect the operation of subsequent glDrawPixels , glReadPixels , glCopyPixels , glTexImage1D , and glTexImage2D commands. Pixel transfer operations happen in the same order, and in the same manner, regardless of the command that resulted in the pixel operation. Color pixels are made up of four floating-point values with unspecified mantissa and exponent sizes, scaled such that 0.0 represents zero intensity and 1.0 represents full intensity. Color indices comprise a single fixed-point value, with unspecified precision to the right of the binary point. Depth pixels comprise a single floating-point value, with unspecified mantissa and exponent sizes, scaled such that 0.0 represents the minimum depth buffer value, and 1.0 represents the maximum depth buffer value.