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Manual Reference Pages  - GLGETCOLORTABLEPARAMETER (3G)

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glGetColorTableParameterfv, glGetColorTableParameteriv - get color lookup table parameters

CONTENTS

C Specification
Parameters
Description
Notes
Errors
See Also

void glGetColorTableParameterfv( GLenum target,

                               GLenum pname,
                               GLfloat *params )

void glGetColorTableParameteriv( GLenum target,

                               GLenum pname,
                               GLint *params )

target	The target color table. Must be  GL_COLOR_TABLE,  GL_POST_CONVOLUTION_COLOR_TABLE,  GL_POST_COLOR_MATRIX_COLOR_TABLE,  GL_PROXY_COLOR_TABLE,  GL_PROXY_POST_CONVOLUTION_COLOR_TABLE,  GL_PROXY_POST_COLOR_MATRIX_COLOR_TABLE.
pname	The symbolic name of a color lookup table parameter. Must be one of  GL_COLOR_TABLE_BIAS,  GL_COLOR_TABLE_SCALE,  GL_COLOR_TABLE_FORMAT,  GL_COLOR_TABLE_WIDTH,  GL_COLOR_TABLE_RED_SIZE,  GL_COLOR_TABLE_GREEN_SIZE,  GL_COLOR_TABLE_BLUE_SIZE,  GL_COLOR_TABLE_ALPHA_SIZE,  GL_COLOR_TABLE_LUMINANCE_SIZE, or  GL_COLOR_TABLE_INTENSITY_SIZE.
params	A pointer to an array where the values of the parameter will be stored.

Returns parameters specific to color table target.

When pname is set to  GL_COLOR_TABLE_SCALE or  GL_COLOR_TABLE_BIAS,  glGetColorTableParameter returns the color table scale or bias parameters for the table specified by target. For these queries, target must be set to  GL_COLOR_TABLE,  GL_POST_CONVOLUTION_COLOR_TABLE, or  GL_POST_COLOR_MATRIX_COLOR_TABLE and params points to an array of four elements, which receive the scale or bias factors for red, green, blue, and alpha, in that order.

 glGetColorTableParameter can also be used to retrieve the and size parameters for a color table. For these queries, set target to either the color table target or the proxy color table target. The and size parameters are set by  glColorTable.

The following table lists the and size parameters that may be queried. For each symbolic constant listed below for pname, params must point to an array of the given length, and receive the values indicated.

Parameter	N	Meaning
GL_COLOR_TABLE_FORMAT	1	Internal (e.g.  GL_RGBA)
GL_COLOR_TABLE_WIDTH	1	Number of elements in table
GL_COLOR_TABLE_RED_SIZE	1	Size of red component, in bits
GL_COLOR_TABLE_GREEN_SIZE	1	Size of green component
GL_COLOR_TABLE_BLUE_SIZE	1	Size of blue component
GL_COLOR_TABLE_ALPHA_SIZE	1	Size of alpha component
GL_COLOR_TABLE_LUMINANCE_SIZE	1	Size of luminance component
GL_COLOR_TABLE_INTENSITY_SIZE	1	Size of intensity component

 glGetColorTableParameter is present only if  GL_ARB_imaging is returned when  glGetString is called with an argument of  GL_EXTENSIONS.

 GL_INVALID_ENUM is generated if target or pname is not an acceptable value.

 GL_INVALID_OPERATION is generated if  glGetColorTableParameter is executed between the execution of  glBegin and the corresponding execution of  glEnd.

 glColorTable(3G),  glTexParameter(3G),  glColorTableParameter(3G)

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