glGetColorTableParameter(3) glGetColorTableParameter(3)
NAME
glGetColorTableParameterfv, glGetColorTableParameteriv - get color
lookup table parameters
C SPECIFICATION
void glGetColorTableParameterfv( GLenum target,
GLenum pname,
GLfloat *params )
void glGetColorTableParameteriv( GLenum target,
GLenum pname,
GLint *params )
PARAMETERS
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.
DESCRIPTION
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 parame-
ters 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 _
NOTES
glGetColorTableParameter is present only if GL_ARB_imaging is returned
when glGetString is called with an argument of GL_EXTENSIONS.
ERRORS
GL_INVALID_ENUM is generated if target or pname is not an acceptable
value.
GL_INVALID_OPERATION is generated if glGetColorTableParameter is exe-
cuted between the execution of glBegin and the corresponding execution
of glEnd.
SEE ALSO
glColorTable(3), glTexParameter(3), glColorTableParameter(3)
glGetColorTableParameter(3)
Mac OS X 10.6 - Generated Thu Sep 17 20:20:20 CDT 2009