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NAME
glXGetFBConfigAttribSGIX - return information about GLX
fbconfigs
C SPECIFICATION
int glXGetFBConfigAttribSGIX( Display *dpy,
GLXFBConfigSGIX config,
int attrib,
int *value )
PARAMETERS
dpy Specifies the connection to the X server.
config Specifies the configuration to be queried. It is a
pointer to an XVisualInfo structure, not a visual ID
or a pointer to a Visual.
attrib Specifies the configuration attribute to be
returned.
value Returns the requested value.
DESCRIPTION
glXGetFBConfigAttribSGIX sets value to the attrib value from
the specified config. glXGetFBConfigAttribSGIX returns an
error code if it fails for any reason. Otherwise, zero is
returned.
attrib is one of the following:
GLX_BUFFER_SIZE Number of bits per color buffer. For
RGBA visuals, GLX_BUFFER_SIZE is the
sum of GLX_RED_SIZE, GLX_GREEN_SIZE,
GLX_BLUE_SIZE, and GLX_ALPHA_SIZE.
For color index visuals,
GLX_BUFFER_SIZE is the size of the
color indexes.
GLX_LEVEL Frame buffer level of the visual.
Level zero is the default frame
buffer. Positive levels correspond to
frame buffers that overlay the default
buffer, and negative levels correspond
to frame buffers that underlay the
default buffer.
GLX_DOUBLEBUFFER True if color buffers exist in
front/back pairs that can be swapped,
False otherwise.
GLX_STEREO True if color buffers exist in
left/right pairs, False otherwise.
GLX_AUX_BUFFERS Number of auxiliary color buffers that
are available. Zero indicates that no
auxiliary color buffers exist.
GLX_RED_SIZE Number of bits of red stored in each
color buffer.
GLX_GREEN_SIZE Number of bits of green stored in each
color buffer.
GLX_BLUE_SIZE Number of bits of blue stored in each
color buffer.
GLX_ALPHA_SIZE Number of bits of alpha stored in each
color buffer.
GLX_DEPTH_SIZE Number of bits in the depth buffer.
GLX_STENCIL_SIZE Number of bits in the stencil buffer.
GLX_ACCUM_RED_SIZE Number of bits of red stored in the
accumulation buffer.
GLX_ACCUM_GREEN_SIZE Number of bits of green stored in the
accumulation buffer.
GLX_ACCUM_BLUE_SIZE Number of bits of blue stored in the
accumulation buffer.
GLX_ACCUM_ALPHA_SIZE Number of bits of alpha stored in the
accumulation buffer.
GLX_SAMPLE_BUFFERS_SGIS Number of mul-
tisample buffers.
GLX_SAMPLES_SGIS Number of samples stored in each mul-
tisample buffer.
GLX_X_VISUAL_TYPE_EXT X visual type of the associated
visual.
GLX_TRANSPARENT_TYPE_EXT
Transparent type - should be
GLX_NONE_EXT, GLX_TRANSPARENT_RGB_EXT
or GLX_TRANSPARENT_INDEX_EXT.
GLX_TRANSPARENT_INDEX_VALUE_EXT
Transparent index value.
GLX_TRANSPARENT_RED_VALUE_EXT
Transparent red value.
GLX_TRANSPARENT_GREEN_VALUE_EXT
Transparent green value.
GLX_TRANSPARENT_BLUE_VALUE_EXT
Transparent blue value.
GLX_TRANSPARENT_ALPHA_VALUE_EXT
Transparent alpha value.
GLX_VISUAL_CAVEAT_EXT Description of the visual - should be
GLX_NONE_EXT or GLX_SLOW_VISUAL_EXT.
GLX_DRAWABLE_TYPE_SGIX
Mask indicating which GLX drawables
are supported. Valid bits are
GLX_WINDOW_BIT_SGIX,
GLX_PIXMAP_BIT_SGIX and
GLX_PBUFFER_BIT_SGIX.
GLX_RENDER_TYPE_SGIX Mask indicating which OpenGL rendering
modes are supported. Valid bits are
GLX_RGBA_BIT_SGIX,
GLX_COLOR_INDEX_SGIX.
GLX_X_RENDERABLE_SGIX True if X can render to drawable.
GLX_FBCONFIG_ID_SGIX X id of the GLXFBConfigSGIX.
GLX_VISUAL_ID_EXT Visual id of the GLXFBConfigSGIX.
GLX_MAX_PBUFFER_WIDTH_SGIX
Maximum width of the pbuffer sup-
ported.
GLX_MAX_PBUFFER_HEIGHT_SGIX
Maximum height of the pbuffer sup-
ported.
GLX_MAX_PBUFFER_PIXELS_SGIX
Maximum size of the pbuffer supported
GLX_OPTIMAL_PBUFFER_WIDTH_SGIX
Best width to use when creating
pbuffer. Zero indicates that all
widths are equally good.
GLX_OPTIMAL_PBUFFER_HEIGHT_SGIX
Best height to use when creating
pbuffer. Zero indicates that all
widths are equally good.
GLXFBConfigSGIX has an associated X visual if and only if
the GLX_DRAWABLE_TYPE_SGIX has the GLX_WINDOW_BIT_SGIX or
GLX_PIXMAP_BIT_SGIX is set.
Although a GLX implementation can export many config that
support GL rendering, it must support at least one RGBA con-
fig. This config must have at least one color buffer, a
stencil buffer of at least 1 bit, a depth buffer of at least
12 bits, and an accumulation buffer. Alpha bitplanes are
optional in this config. However, its color buffer size
must be as great as that of the deepest TrueColor,
DirectColor, PseudoColor, or StaticColor visual supported on
level zero, and it must itself be made available on level
zero.
Applications are best written to select the config that most
closely meets their requirements. Creating windows, GLX
pixmaps or GLX pbuffers with unnecessary buffers can result
in reduced rendering performance as well as poor resource
allocation.
NOTES
GLX_SGIX_fbconfig extension should be supported for this
function to be valid.
ERRORS
GLX_NO_EXTENSION is returned if dpy does not support the GLX
extension.
GLX_BAD_SCREEN is returned if the screen of vis does not
correspond to a screen.
GLX_BAD_ATTRIBUTE is returned if attrib is not a valid GLX
attribute.
SEE ALSO
glXChooseVisual, glXGetConfig, glXCreateContextWithConfigS-
GIX, glXCreateGLXPixmapWithConfigSGIX, glXChooseFBConfigS-
GIX, glXGetFBConfigFromVisualSGIX, glXGetFBConfigFrom-
VisualSGIX, glXCreateGLXPbufferSGIX, glXDestroyGLXPbufferS-
GIX, glXQueryGLXPbufferSGIX
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