glGetPixelMap
NAME
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
-
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.
- values
-
Returns the pixel map contents.
DESCRIPTION
Please see the PixelMap
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 zero. 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.
GL_INVALID_OPERATION is generated if glGetPixelMap is called
between a call to glBegin and the
corresponding call to glEnd.
ASSOCIATED GETS
glGet with argument
GL_PIXEL_MAP_I_TO_I_SIZE
glGet with argument
GL_PIXEL_MAP_S_TO_S_SIZE
glGet with argument
GL_PIXEL_MAP_I_TO_R_SIZE
glGet with argument
GL_PIXEL_MAP_I_TO_G_SIZE
glGet with argument
GL_PIXEL_MAP_I_TO_B_SIZE
glGet with argument
GL_PIXEL_MAP_I_TO_A_SIZE
glGet with argument
GL_PIXEL_MAP_R_TO_R_SIZE
glGet with argument
GL_PIXEL_MAP_G_TO_G_SIZE
glGet with argument
GL_PIXEL_MAP_B_TO_B_SIZE
glGet with argument
GL_PIXEL_MAP_A_TO_A_SIZE
glGet with argument
GL_MAX_PIXEL_MAP_TABLE
SEE ALSO
glCopyPixels,
glDrawPixels,
glPixelMap,
glPixelTransfer,
glReadPixels,
glTexImage1D,
glTexImage2D
back to the OpenGL index page
© 1995 Uwe Behrens. All rights reserved.