GLPIXELMAP - Online Linux Manual PageSection : 3G
NAME"glPixelMapfv, glPixelMapuiv, glPixelMapusv − set up pixel transfer maps
C SPECIFICATIONvoid glPixelMapfv( GLenum map, GLint mapsize, const GLfloat *values )void glPixelMapuiv( GLenum map, GLint mapsize, const GLuint *values )void glPixelMapusv( GLenum map, GLint mapsize, const GLushort *values )
PARAMETERSmap  Specifies a symbolic map name. Must be one of the following: ­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, or ­GL_PIXEL_MAP_A_TO_A. mapsize  Specifies the size of the map being defined. values  Specifies an array of mapsize values.
DESCRIPTION­glPixelMap sets up translation tables, or maps, used by ­glCopyPixels, ­glCopyTexImage1D, ­glCopyTexImage2D, ­glCopyTexSubImage1D, ­glCopyTexSubImage2D, ­glCopyTexSubImage3D, ­glDrawPixels, ­glReadPixels, ­glTexImage1D, ­glTexImage2D, ­glTexImage3D, ­glTexSubImage1D, ­glTexSubImage2D, and ­glTexSubImage3D. Additionally, if the ­GL_ARB_imaging subset is supported, the routines ­glColorTable, ­glColorSubTable, ­glConvolutionFilter1D, ­glConvolutionFilter2D, ­glHistogram, ­glMinmax, and ­glSeparableFilter2D. Use of these maps is described completely in the ­glPixelTransfer reference page, and partly in the reference pages for the pixel and texture image commands. Only the specification of the maps is described in this reference page. map is a symbolic map name, indicating one of ten maps to set. mapsize specifies the number of entries in the map, and values is a pointer to an array of mapsize map values. The ten maps are as follows: ­GL_PIXEL_MAP_I_TO_I  Maps color indices to color indices. ­GL_PIXEL_MAP_S_TO_S  Maps stencil indices to stencil indices. ­GL_PIXEL_MAP_I_TO_R  Maps color indices to red components. ­GL_PIXEL_MAP_I_TO_G  Maps color indices to green components. ­GL_PIXEL_MAP_I_TO_B  Maps color indices to blue components. ­GL_PIXEL_MAP_I_TO_A  Maps color indices to alpha components. ­GL_PIXEL_MAP_R_TO_R  Maps red components to red components. ­GL_PIXEL_MAP_G_TO_G  Maps green components to green components. ­GL_PIXEL_MAP_B_TO_B  Maps blue components to blue components. ­GL_PIXEL_MAP_A_TO_A  Maps alpha components to alpha components. The entries in a map can be specified as single-precision floating-point numbers, unsigned short integers, or unsigned long integers. Maps that store color component values (all but ­GL_PIXEL_MAP_I_TO_I and ­GL_PIXEL_MAP_S_TO_S) retain their values in floating-point , with unspecified mantissa and exponent sizes. Floating-point values specified by ­glPixelMapfv are converted directly to the internal floating-point of these maps, then clamped to the range [0,1]. Unsigned integer values specified by ­glPixelMapusv and ­glPixelMapuiv are converted linearly such that the largest representable integer maps to 1.0, and 0 maps to 0.0. Maps that store indices, ­GL_PIXEL_MAP_I_TO_I and ­GL_PIXEL_MAP_S_TO_S, retain their values in fixed-point , with an unspecified number of bits to the right of the binary point. Floating-point values specified by ­glPixelMapfv are converted directly to the internal fixed-point of these maps. Unsigned integer values specified by ­glPixelMapusv and ­glPixelMapuiv specify integer values, with all 0's to the right of the binary point. The following table shows the initial sizes and values for each of the maps. Maps that are indexed by either color or stencil indices must have mapsize = 2n for some n or the results are undefined. The maximum allowable size for each map depends on the implementation and can be determined by calling ­glGet with argument ­GL_MAX_PIXEL_MAP_TABLE. The single maximum applies to all maps; it is at least 32. .bp mapLookup IndexLookup ValueInitial SizeInitial Value ­GL_PIXEL_MAP_I_TO_Icolor indexcolor index10 ­GL_PIXEL_MAP_S_TO_Sstencil index stencil index 10 ­GL_PIXEL_MAP_I_TO_Rcolor index R10 ­GL_PIXEL_MAP_I_TO_Gcolor index G10 ­GL_PIXEL_MAP_I_TO_Bcolor indexB10 ­GL_PIXEL_MAP_I_TO_Acolor indexA10 ­GL_PIXEL_MAP_R_TO_RRR10 ­GL_PIXEL_MAP_G_TO_GGG10 ­GL_PIXEL_MAP_B_TO_BBB10 ­GL_PIXEL_MAP_A_TO_AAA10
ERRORS­GL_INVALID_ENUM is generated if map is not an accepted value. ­GL_INVALID_VALUE is generated if mapsize is less than one or larger than ­GL_MAX_PIXEL_MAP_TABLE. ­GL_INVALID_VALUE is generated if map is ­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, or ­GL_PIXEL_MAP_I_TO_A, and mapsize is not a power of two. ­GL_INVALID_OPERATION is generated if ­glPixelMap is executed between the execution of ­glBegin and the corresponding execution of ­glEnd.
ASSOCIATED GETS­glGetPixelMap
­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 ALSO­glColorTable(3G), ­glColorSubTable(3G), ­glConvolutionFilter1D(3G), ­glConvolutionFilter2D(3G), ­glCopyPixels(3G), ­glCopyTexImage1D(3G), ­glCopyTexImage2D(3G), ­glCopyTexSubImage1D(3G), ­glCopyTexSubImage2D(3G), ­glDrawPixels(3G), ­glHistogram(3G), ­glMinmax(3G), ­glPixelStore(3G), ­glPixelTransfer(3G), ­glReadPixels(3G), ­glSeparableFilter2D(3G), ­glTexImage1D(3G), ­glTexImage2D(3G), ­glTexImage3D(3G), ­glTexSubImage1D(3G), ­glTexSubImage2D(3G), ­glTexSubImage3D(3G) 0
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