glXGetFBConfigAttribSGIX(3G)
glXGetFBConfigAttribSGIX - return information about a GLX frame buffer configuraton
As shipped in IRIX 6.5.5. Unchanged since IRIX 6.5.
NAME glXGetFBConfigAttribSGIX - return information about a GLX frame buffer configuraton C SPECIFICATION int glXGetFBConfigAttribSGIX( Display *dpy, GLXFBConfigSGIX config, int attribute, int *value ) PARAMETERS dpy Specifies the connection to the X server. config Specifies the GLX frame buffer configuration to be queried. attribute Specifies the attribute to be returned. value Returns the requested value. DESCRIPTION glXGetFBConfigAttribSGIX sets value to the attribute value of GLX drawables created with respect to config. glXGetFBConfigAttribSGIX returns an error code if it fails for any reason. Otherwise, zero is returned. attribute is one of the following: GLX_BUFFER_SIZE Number of bits per color buffer. If the frame buffer configuration supports RGBA contexts then GLX_BUFFER_SIZE is the sum of GLX_RED_SIZE, GLX_GREEN_SIZE, GLX_BLUE_SIZE, and GLX_ALPHA_SIZE. If the frame buffer configuration supports only color index contexts, GLX_BUFFER_SIZE is the size of the color indexes. GLX_LEVEL Frame buffer level of the configuration. 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. Undefined if RGBA contexts are not supported by the frame buffer configuration. GLX_GREEN_SIZE Number of bits of green stored in each color buffer. Undefined if RGBA contexts are not supported by the frame buffer configuration. GLX_BLUE_SIZE Number of bits of blue stored in each color buffer. Undefined if RGBA contexts are not supported by the frame buffer configuration. GLX_ALPHA_SIZE Number of bits of alpha stored in each color buffer. Undefined if RGBA contexts are not supported by the frame buffer configuration. 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 multisample buffers. GLX_SAMPLES_SGIS Number of samples per pixel in multisample buffers. GLX_X_VISUAL_TYPE_EXT Visual type of associated visual. Undefined if there is no associated visual (i.e., if GLX_X_RENDERABLE_SGIX is False or GLX_DRAWABLE_TYPE_SGIX does not have the GLX_WINDOW_BIT_SGIX bit set.) GLX_TRANSPARENT_TYPE_EXT One of GLX_NONE_EXT, GLX_TRANSPARENT_RGB_EXT, GLX_TRANSPARENT_INDEX_EXT, indicating that the frame buffer configuration is opaque, is transparent for particular values of red, green and blue or is transparent for particular index values, respectively. GLX_TRANSPARENT_INDEX_VALUE_EXT Integer value between 0 and the maximum frame buffer value for indices, indicating the transparent index value for the frame buffer configuration. Undefined if GLX_TRANSPARENT_TYPE_EXT is not GLX_TRANSPARENT_INDEX_EXT. GLX_TRANSPARENT_RED_VALUE_EXT Integer value between 0 and the maximum frame buffer value for red, indicating the transparent red value for the frame buffer configuration. Undefined if GLX_TRANSPARENT_TYPE_EXT is not GLX_TRANSPARENT_RGB_EXT. GLX_TRANSPARENT_GREEN_VALUE_EXT Integer value between 0 and the maximum frame buffer value for green, indicating the transparent green value for the frame buffer configuration. Undefined if GLX_TRANSPARENT_TYPE_EXT is not GLX_TRANSPARENT_RGB_EXT. GLX_TRANSPARENT_BLUE_VALUE_EXT Integer value between 0 and the maximum frame buffer value for blue, indicating the transparent blue value for the frame buffer configuration. Undefined if GLX_TRANSPARENT_TYPE_EXT is not GLX_TRANSPARENT_RGB_EXT. GLX_TRANSPARENT_ALPHA_VALUE_EXT Currently unused. GLX_VISUAL_CAVEAT_EXT One of GLX_NONE_EXT, GLX_SLOW_VISUAL_EXT, GLX_NON_CONFORMANT_EXT indicating that the frame buffer configuration has no caveats, some aspect of the frame buffer configuration runs slower than other frame buffer configurations, or some aspect of the frame buffer configuration is non-confomant, respectively. GLX_DRAWABLE_TYPE_SGIX Mask indicating what drawable types the frame buffer configuration supports. Valid bits are GLX_WINDOW_BIT_SGIX, GLX_PIXMAP_BIT_SGIX and GLX_PBUFFER_BIT_SGIX. GLX_RENDER_TYPE_SGIX Mask indicating what type of GLX contexts can be made current to the frame buffer configuration. Valid bits are GLX_RGBA_BIT_SGIX and GLX_COLOR_INDEX_BIT_SGIX. GLX_X_RENDERABLE_SGIX True if drawables created with the frame buffer configuration can be rendered to by X. GLX_MAX_PBUFFER_WIDTH_SGIX The maximum width that can be specified to glXCreateGLXPbufferSGIX. GLX_MAX_PBUFFER_HEIGHT_SGIX The maximum height that can be specified to glXCreateGLXPbufferSGIX. GLX_MAX_PBUFFER_PIXELS_SGIX The maximum number of pixels (width times height) for a pbuffer. Note that this value may be less than GLX_MAX_PBUFFER_WIDTH_SGIX times GLX_MAX_PBUFFER_HEIGHT_SGIX. Also, this value is static and assumes that no other pbuffers or X resources are contending for the framebuffer memory. As a result, it may not be possible to allocate a pbuffer of the size given by GLX_MAX_PBUFFER_PIXELS_SGIX. GLX_OPTIMAL_PBUFFER_WIDTH_SGIX The optimum width for a pbuffer. GLX_OPTIMAL_PBUFFER_HEIGHT_SGIX The optimum height for a pbuffer. Applications should choose the frame buffer configuration that most closely meets their requirements. Creating windows, GLX pixmaps or GLX pixel buffers with unnecessary buffers can result in reduced rendering performance as well as poor resource allocation. NOTES glXGetFBConfigAttribSGIX is part of the GLX_SGIX_fbconfig extension. glXGetFBConfigAttribSGIX is implemented as a client-side utility; it does not require a round-trip to the X server. GLX_SAMPLE_BUFFERS_SGIS and GLX_SAMPLES_SGIS are not valid attributes unless the SGIS_multisample extension is supported. GLX_X_VISUAL_TYPE_EXT, GLX_TRANSPARENT_TYPE_EXT, GLX_TRANSPARENT_INDEX_VALUE_EXT, GLX_TRANSPARENT_RED_VALUE_EXT, GLX_TRANSPARENT_GREEN_VALUE_EXT, GLX_TRANSPARENT_BLUE_VALUE_EXT, and GLX_TRANSPARENT_ALPHA_VALUE_EXT are not valid attributes unless the EXT_visual_info extension is supported. GLX_VISUAL_CAVEAT_EXT is not a valid attribute unless the EXT_visual_rating extension is supported. ERRORS GLX_NO_EXTENSION is returned if dpy does not support the GLX extension. GLX_BAD_ATTRIB is returned if attribute is not a valid GLX attribute. MACHINE DEPENDENCIES The SGIS_multisample extension is supported only on RealityEngine, RealityEngine2, and VTX systems and InfiniteReality systems. SEE ALSO glXGetConfig, glXChooseFBConfigSGIX, glXCreateGLXPixmapWithConfigSGIX, glXCreateContextWithConfigSGIX, glXGetVisualFromFBConfigSGIX, glXGetFBConfigFromVisualSGIX.