GLGETSTRING(3G)GLGETSTRING(3G)NAME
- return a string describing the current GL connection
C SPECIFICATION
const GLubyte* glGetString( GLenum name )
PARAMETERS
name Specifies a symbolic constant, one of GL_VENDOR, GL_RENDERER, GL_VERSION, or GL_EXTENSIONS.
DESCRIPTION
glGetString returns a pointer to a static string describing some aspect of the current GL connection. name can be one of the following:
GL_VENDOR Returns the company responsible for this GL implementation. This name does not change from release to release.
GL_RENDERER Returns the name of the renderer. This name is typically specific to a particular configuration of a hardware plat-
form. It does not change from release to release.
GL_VERSION Returns a version or release number.
GL_EXTENSIONS Returns a space-separated list of supported extensions to GL.
Because the GL does not include queries for the performance characteristics of an implementation, some applications are written to recog-
nize known platforms and modify their GL usage based on known performance characteristics of these platforms. Strings GL_VENDOR and
GL_RENDERER together uniquely specify a platform. They do not change from release to release and should be used by platform-recognition
algorithms.
Some applications want to make use of features that are not part of the standard GL. These features may be implemented as extensions to the
standard GL. The GL_EXTENSIONS string is a space-separated list of supported GL extensions. (Extension names never contain a space char-
acter.)
The GL_VERSION string begins with a version number. The version number uses one of these forms:
major_number.minor_number
major_number.minor_number.release_number
Vendor-specific information may follow the version number. Its depends on the implementation, but a space always separates the version
number and the vendor-specific information.
All strings are null-terminated.
NOTES
If an error is generated, glGetString returns 0.
The client and server may support different versions or extensions. glGetString always returns a compatible version number or list of
extensions. The release number always describes the server.
ERRORS
GL_INVALID_ENUM is generated if name is not an accepted value.
GL_INVALID_OPERATION is generated if glGetString is executed between the execution of glBegin and the corresponding execution of glEnd.
GLGETSTRING(3G)
Check Out this Related Man Page
GLGETCOLORTABLEPARAMETER(3G)GLGETCOLORTABLEPARAMETER(3G)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 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
-------------------------------------------------------------------
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 executed between the execution of glBegin and the corresponding execution
of glEnd.
SEE ALSO glColorTable(3G), glTexParameter(3G), glColorTableParameter(3G)GLGETCOLORTABLEPARAMETER(3G)