1991-2006 Silicon Graphics, Inc. glXGetFBConfigAttrib 3G glXGetFBConfigAttrib return information about a GLX frame buffer configuration int glXGetFBConfigAttrib Display * dpy GLXFBConfig config int attribute int * value 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. glXGetFBConfigAttrib sets value to the attribute value of GLX drawables created with respect to config. glXGetFBConfigAttrib returns an error code if it fails for any reason. Otherwise, Success is returned. attribute is one of the following: GLX_FBCONFIG_ID XID of the given GLXFBConfig. 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 underlie 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_RENDER_TYPE Mask indicating what type of GLX contexts can be made current to the frame buffer configuration. Valid bits are GLX_RGBA_BIT and GLX_COLOR_INDEX_BIT. GLX_DRAWABLE_TYPE Mask indicating what drawable types the frame buffer configuration supports. Valid bits are GLX_WINDOW_BIT, GLX_PIXMAP_BIT, and GLX_PBUFFER_BIT. GLX_X_RENDERABLE True if drawables created with the frame buffer configuration can be rendered to by X. GLX_VISUAL_ID XID of the corresponding visual, or zero if there is no associated visual (i.e., if GLX_X_RENDERABLE is False or GLX_DRAWABLE_TYPE does not have the GLX_WINDOW_BIT bit set). GLX_X_VISUAL_TYPE Visual type of associated visual. The returned value will be one of: GLX_TRUE_COLOR, GLX_DIRECT_COLOR, GLX_PSEUDO_COLOR, GLX_STATIC_COLOR, GLX_GRAY_SCALE, GLX_STATIC_GRAY, or GLX_NONE, if there is no associated visual (i.e., if GLX_X_RENDERABLE is False or GLX_DRAWABLE_TYPE does not have the GLX_WINDOW_BIT bit set). GLX_CONFIG_CAVEAT One of GLX_NONE, GLX_SLOW_CONFIG, or GLX_NON_CONFORMANT_CONFIG, 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 nonconformant, respectively. GLX_TRANSPARENT_TYPE One of GLX_NONE, GLX_TRANSPARENT_RGB, GLX_TRANSPARENT_INDEX, 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 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 is not GLX_TRANSPARENT_INDEX. GLX_TRANSPARENT_RED_VALUE 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 is not GLX_TRANSPARENT_RGB. GLX_TRANSPARENT_GREEN_VALUE 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 is not GLX_TRANSPARENT_RGB. GLX_TRANSPARENT_BLUE_VALUE 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 is not GLX_TRANSPARENT_RGB. GLX_TRANSPARENT_ALPHA_VALUE Integer value between 0 and the maximum frame buffer value for alpha, indicating the transparent blue value for the frame buffer configuration. Undefined if GLX_TRANSPARENT_TYPE is not GLX_TRANSPARENT_RGB. GLX_MAX_PBUFFER_WIDTH The maximum width that can be specified to glXCreatePbuffer. GLX_MAX_PBUFFER_HEIGHT The maximum height that can be specified to glXCreatePbuffer. GLX_MAX_PBUFFER_PIXELS The maximum number of pixels (width times height) for a pixel buffer. Note that this value may be less than GLX_MAX_PBUFFER_WIDTH times GLX_MAX_PBUFFER_HEIGHT. Also, this value is static and assumes that no other pixel buffers or X resources are contending for the frame buffer memory. As a result, it may not be possible to allocate a pixel buffer of the size given by GLX_MAX_PBUFFER_PIXELS. 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. glXGetFBConfigAttrib is available only if the GLX version is 1.3 or greater. If the GLX version is 1.1 or 1.0, the GL version must be 1.0. If the GLX version is 1.2, then the GL version must be 1.1. If the GLX version is 1.3, then the GL version must be 1.2. GLX_NO_EXTENSION is returned if dpy does not support the GLX extension. GLX_BAD_ATTRIBUTE is returned if attribute is not a valid GLX attribute. glXGetFBConfigs, glXChooseFBConfig, glXGetVisualFromFBConfig, glXGetConfig Copyright 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.