glGetPixelMapfv(3gl)

1GLGETPIXELMAP(3G)                                            GLGETPIXELMAP(3G)
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NAME

6       glGetPixelMapfv, glGetPixelMapuiv, glGetPixelMapusv - return the speci‐
7       fied pixel map
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C SPECIFICATION

11       void glGetPixelMapfv( GLenum map,
12                             GLfloat *values )
13       void glGetPixelMapuiv( GLenum map,
14                              GLuint *values )
15       void glGetPixelMapusv( GLenum map,
16                              GLushort *values )
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PARAMETERS

20       map     Specifies the name of the pixel map to return.  Accepted values
21               are          GL_PIXEL_MAP_I_TO_I,          GL_PIXEL_MAP_S_TO_S,
22               GL_PIXEL_MAP_I_TO_R, GL_PIXEL_MAP_I_TO_G,  GL_PIXEL_MAP_I_TO_B,
23               GL_PIXEL_MAP_I_TO_A,  GL_PIXEL_MAP_R_TO_R, GL_PIXEL_MAP_G_TO_G,
24               GL_PIXEL_MAP_B_TO_B, and GL_PIXEL_MAP_A_TO_A.
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26       values  Returns the pixel map contents.
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DESCRIPTION

29       See the glPixelMap reference page for a description of  the  acceptable
30       values for the map parameter.  glGetPixelMap returns in values the con‐
31       tents of the pixel map specified in map.  Pixel maps  are  used  during
32       the    execution    of    glReadPixels,   glDrawPixels,   glCopyPixels,
33       glTexImage1D,     glTexImage2D,     glTexImage3D,      glTexSubImage1D,
34       glTexSubImage2D,  glTexSubImage3D,  glCopyTexImage1D, glCopyTexImage2D,
35       glCopyTexSubImage1D,     glCopyTexSubImage2D,      glCopyTexSubImage3D,
36       glColorTable,  glColorSubTable,  glCopyColorTable, glCopyColorSubTable,
37       glConvolutionFilter1D,   glConvolutionFilter2D,    glSeparableFilter2D,
38       glGetHistogram,  glGetMinmax,  and  glGetTexImage to map color indices,
39       stencil indices, color components, and depth components to  other  val‐
40       ues.
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42       Unsigned  integer  values,  if  requested, are linearly mapped from the
43       internal fixed or floating-point representation such that 1.0  maps  to
44       the  largest  representable  integer  value, and 0.0 maps to 0.  Return
45       unsigned integer values are undefined if the map value was not  in  the
46       range [0,1].
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48       To  determine the required size of map, call glGet with the appropriate
49       symbolic constant.
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NOTES

52       If an error is generated, no change is made to the contents of values.
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ERRORS

55       GL_INVALID_ENUM is generated if map is not an accepted value.
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57       GL_INVALID_OPERATION is generated if glGetPixelMap is executed  between
58       the execution of glBegin and the corresponding execution of glEnd.
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ASSOCIATED GETS

61       glGet with argument GL_PIXEL_MAP_I_TO_I_SIZE
62       glGet with argument GL_PIXEL_MAP_S_TO_S_SIZE
63       glGet with argument GL_PIXEL_MAP_I_TO_R_SIZE
64       glGet with argument GL_PIXEL_MAP_I_TO_G_SIZE
65       glGet with argument GL_PIXEL_MAP_I_TO_B_SIZE
66       glGet with argument GL_PIXEL_MAP_I_TO_A_SIZE
67       glGet with argument GL_PIXEL_MAP_R_TO_R_SIZE
68       glGet with argument GL_PIXEL_MAP_G_TO_G_SIZE
69       glGet with argument GL_PIXEL_MAP_B_TO_B_SIZE
70       glGet with argument GL_PIXEL_MAP_A_TO_A_SIZE
71       glGet with argument GL_MAX_PIXEL_MAP_TABLE
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