HP Workstation zx2000 OpenGL 1.1 Reference for HP-UX 11.x - Page 204

G glGetPixelMap glGetPixelMap glGetPixelMapfv, glGetPixelMapuiv, glGetPixelMapusv: return the specified pixel map. C Specification void glGetPixelMapfv GLenum map GLfloat *values void glGetPixelMapuiv GLenum map GLuint *values void glGetPixelMapusv GLenum map GLushort *values) Parameters map values Specifies the name of the pixel map to return. Accepted values are GL_PIXEL_MAP_I_TO_I, GL_PIXEL_MAP_S_TO_S, GL_PIXEL_MAP_I_TO_R, GL_PIXEL_MAP_I_TO_G, GL_PIXEL_MAP_I_TO_B, GL_PIXEL_MAP_I_TO_A, GL_PIXEL_MAP_R_TO_R, GL_PIXEL_MAP_G_TO_G, GL_PIXEL_MAP_B_TO_B, and GL_PIXEL_MAP_A_TO_A. Returns the pixel map contents. Description See the glPixelMap reference page for a description of the acceptable values for the map parameter. glGetPixelMap returns in values the contents of the pixel map specified in map. Pixel maps are used during the execution of glReadPixels, glDrawPixels, glCopyPixels, glTexImage1D, and glTexImage2D to map color indices, stencil indices, color components, and depth components to other values. Unsigned integer values, if requested, are linearly mapped from the internal fixed or floating-point representation such that 1.0 maps to the largest representable integer value, and 0.0 maps to 0. Return unsigned integer values are undefined if the map value was not in the range [0, 1]. To determine the required size of map, call glGet with the appropriate symbolic constant. Notes If an error is generated, no change is made to the contents of values. Errors • GL_INVALID_ENUM is generated if map is not an accepted value. 204 Chapter 7