Интерактивная система просмотра системных руководств (man-ов)
glGetPixelMap (3)
>> glGetPixelMap (3) ( Разные man: Библиотечные вызовы )
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
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,
glTexImage2D,
glTexImage3D,
glTexSubImage1D,
glTexSubImage2D,
glTexSubImage3D,
glCopyTexImage1D,
glCopyTexImage2D,
glCopyTexSubImage1D,
glCopyTexSubImage2D,
glCopyTexSubImage3D,
glColorTable,
glColorSubTable,
glCopyColorTable,
glCopyColorSubTable,
glConvolutionFilter1D,
glConvolutionFilter2D,
glSeparableFilter2D,
glGetHistogram,
glGetMinmax, and
glGetTexImage
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.
GL_INVALID_OPERATION is generated if glGetPixelMap
is executed between the execution of glBegin
and the corresponding execution of 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
