HP Workstation zx2000 OpenGL 1.1 Reference for HP-UX 11.x - Page 335

Chapter 14 P glPixelTransfer Each index is shifted GL_INDEX_SHIFT bits just as a color index is, then added to GL_INDEX_OFFSET. If GL_MAP_STENCIL is true, each index is masked by 2n - 1, where n is GL_PIXEL_MAP_S_TO_S_SIZE, then replaced by the contents of GL_PIXEL_MAP_S_TO_S indexed by the masked value. The following table gives the type, initial value, and range of valid values for each of the pixel transfer parameters that are set with glPixelTransfer. pname GL_MAP_COLOR GL_MAP_STENCIL GL_INDEX_SHIFT GL_INDEX_OFFSET GL_RED_SCALE GL_GREEN_SCALE GL_BLUE_SCALE GL_ALPHA_SCALE GL_DEPTH_SCALE GL_RED_BIAS GL_GREEN_BIAS GL_BLUE_BIAS GL_ALPHA_BIAS GL_DEPTH_BIAS Type boolean boolean integer integer float float float float float float float float float float Initial Value false false 0 0 1 1 1 1 1 0 0 0 0 0 Valid Range true/false true/false glPixelTransferf can be used to set any pixel transfer parameter. If the parameter type is boolean, 0 implies false and any other value implies true. If pname is an integer parameter, param is rounded to the nearest integer. Likewise, glPixelTransferi can be used to set any of the pixel transfer parameters. Boolean parameters are set to false if param is 0 and to true otherwise. param is converted to floating point before being assigned to real-valued parameters. Notes If a glCopyPixels, glCopyTexImage1D,glCopyTexImage2D, glCopyTexSubImage1D, glCopyTexSubImage2D, glDrawPixels, glReadPixels, glTexImage1D, glTexImage2D, glTexSubImage1D, or glTexSubImage2D command is placed in a display list (see glNewList and glCallList), the pixel transfer mode settings in effect when the display list is executed are the ones that are used. They may be different from the settings when the command was compiled into the display list. 335