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Table of Contents
glGetColorTableParameterfv, glGetColorTableParameteriv - get color lookup table parameters
void glGetColorTableParameterfv(
GLenum target,
GLenum pname,
GLfloat *params )
void glGetColorTableParameteriv( GLenum target,
GLenum pname,
GLint *params )
eqn not supported
- 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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