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Manual Reference Pages  - GLGETPIXELMAP (3G)

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glGetPixelMapfv, glGetPixelMapuiv, glGetPixelMapusv - return the specified pixel map

CONTENTS

C Specification
Parameters
Description
Notes
Errors
Associated Gets
See Also

void glGetPixelMapfv( GLenum map,

                    GLfloat *values )

void glGetPixelMapuiv( GLenum map,

                     GLuint *values )

void glGetPixelMapusv( GLenum map,

                     GLushort *values )

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.

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.

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

 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.

 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

 glColorSubTable(3G),  glColorTable(3G),  glConvolutionFilter1D(3G),  glConvolutionFilter2D(3G),  glCopyColorSubTable(3G),  glCopyColorTable(3G),  glCopyPixels(3G),  glCopyTexImage1D(3G),  glCopyTexImage2D(3G),  glCopyTexSubImage1D(3G),  glCopyTexSubImage2D(3G),  glCopyTexSubImage3D(3G),  glDrawPixels(3G),  glGetHistogram(3G),  glGetMinmax(3G),  glGetTexImage(3G),  glPixelMap(3G),  glPixelTransfer(3G),  glReadPixels(3G),  glSeparableFilter2D(3G),  glTexImage1D(3G),  glTexImage2D(3G)  glTexImage3D(3G),  glTexSubImage1D(3G),  glTexSubImage2D(3G),  glTexSubImage3D(3G)

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