glcontextmodes.c

mesa-6.5-minigui源码

	*value_return = mode->level;
	return 0;
      case GLX_TRANSPARENT_TYPE_EXT:
	*value_return = mode->transparentPixel;
	return 0;
      case GLX_TRANSPARENT_RED_VALUE:
	*value_return = mode->transparentRed;
	return 0;
      case GLX_TRANSPARENT_GREEN_VALUE:
	*value_return = mode->transparentGreen;
	return 0;
      case GLX_TRANSPARENT_BLUE_VALUE:
	*value_return = mode->transparentBlue;
	return 0;
      case GLX_TRANSPARENT_ALPHA_VALUE:
	*value_return = mode->transparentAlpha;
	return 0;
      case GLX_TRANSPARENT_INDEX_VALUE:
	*value_return = mode->transparentIndex;
	return 0;
      case GLX_X_VISUAL_TYPE:
	*value_return = mode->visualType;
	return 0;
      case GLX_CONFIG_CAVEAT:
	*value_return = mode->visualRating;
	return 0;
      case GLX_VISUAL_ID:
	*value_return = mode->visualID;
	return 0;
      case GLX_DRAWABLE_TYPE:
	*value_return = mode->drawableType;
	return 0;
      case GLX_RENDER_TYPE:
	*value_return = mode->renderType;
	return 0;
      case GLX_X_RENDERABLE:
	*value_return = mode->xRenderable;
	return 0;
      case GLX_FBCONFIG_ID:
	*value_return = mode->fbconfigID;
	return 0;
      case GLX_MAX_PBUFFER_WIDTH:
	*value_return = mode->maxPbufferWidth;
	return 0;
      case GLX_MAX_PBUFFER_HEIGHT:
	*value_return = mode->maxPbufferHeight;
	return 0;
      case GLX_MAX_PBUFFER_PIXELS:
	*value_return = mode->maxPbufferPixels;
	return 0;
      case GLX_OPTIMAL_PBUFFER_WIDTH_SGIX:
	*value_return = mode->optimalPbufferWidth;
	return 0;
      case GLX_OPTIMAL_PBUFFER_HEIGHT_SGIX:
	*value_return = mode->optimalPbufferHeight;
	return 0;
      case GLX_SWAP_METHOD_OML:
	*value_return = mode->swapMethod;
	return 0;
      case GLX_SAMPLE_BUFFERS_SGIS:
	*value_return = mode->sampleBuffers;
	return 0;
      case GLX_SAMPLES_SGIS:
	*value_return = mode->samples;
	return 0;

      /* Applications are NOT allowed to query GLX_VISUAL_SELECT_GROUP_SGIX.
       * It is ONLY for communication between the GLX client and the GLX
       * server.
       */
      case GLX_VISUAL_SELECT_GROUP_SGIX:
      default:
	return GLX_BAD_ATTRIBUTE;
    }
}
#endif /* !defined(IN_MINI_GLX) */


/**
 * Allocate a linked list of \c __GLcontextModes structures.  The fields of
 * each structure will be initialized to "reasonable" default values.  In
 * most cases this is the default value defined by table 3.4 of the GLX
 * 1.3 specification.  This means that most values are either initialized to
 * zero or \c GLX_DONT_CARE (which is -1).  As support for additional
 * extensions is added, the new values will be initialized to appropriate
 * values from the extension specification.
 * 
 * \param count         Number of structures to allocate.
 * \param minimum_size  Minimum size of a structure to allocate.  This allows
 *                      for differences in the version of the
 *                      \c __GLcontextModes stucture used in libGL and in a
 *                      DRI-based driver.
 * \returns A pointer to the first element in a linked list of \c count
 *          stuctures on success, or \c NULL on failure.
 * 
 * \warning Use of \c minimum_size does \b not guarantee binary compatibility.
 *          The fundamental assumption is that if the \c minimum_size
 *          specified by the driver and the size of the \c __GLcontextModes
 *          structure in libGL is the same, then the meaning of each byte in
 *          the structure is the same in both places.  \b Be \b careful!
 *          Basically this means that fields have to be added in libGL and
 *          then propagated to drivers.  Drivers should \b never arbitrarilly
 *          extend the \c __GLcontextModes data-structure.
 */
__GLcontextModes *
_gl_context_modes_create( unsigned count, size_t minimum_size )
{
   const size_t size = (minimum_size > sizeof( __GLcontextModes ))
       ? minimum_size : sizeof( __GLcontextModes );
   __GLcontextModes * base = NULL;
   __GLcontextModes ** next;
   unsigned   i;

   next = & base;
   for ( i = 0 ; i < count ; i++ ) {
      *next = (__GLcontextModes *) _mesa_malloc( size );
      if ( *next == NULL ) {
	 _gl_context_modes_destroy( base );
	 base = NULL;
	 break;
      }
      
      (void) _mesa_memset( *next, 0, size );
      (*next)->visualID = GLX_DONT_CARE;
      (*next)->visualType = GLX_DONT_CARE;
      (*next)->visualRating = GLX_NONE;
      (*next)->transparentPixel = GLX_NONE;
      (*next)->transparentRed = GLX_DONT_CARE;
      (*next)->transparentGreen = GLX_DONT_CARE;
      (*next)->transparentBlue = GLX_DONT_CARE;
      (*next)->transparentAlpha = GLX_DONT_CARE;
      (*next)->transparentIndex = GLX_DONT_CARE;
      (*next)->xRenderable = GLX_DONT_CARE;
      (*next)->fbconfigID = GLX_DONT_CARE;
      (*next)->swapMethod = GLX_SWAP_UNDEFINED_OML;

      next = & ((*next)->next);
   }

   return base;
}


/**
 * Destroy a linked list of \c __GLcontextModes structures created by
 * \c _gl_context_modes_create.
 * 
 * \param modes  Linked list of structures to be destroyed.  All structres
 *               in the list will be freed.
 */
void
_gl_context_modes_destroy( __GLcontextModes * modes )
{
   while ( modes != NULL ) {
      __GLcontextModes * const next = modes->next;

      _mesa_free( modes );
      modes = next;
   }
}


/**
 * Find a context mode matching a Visual ID.
 *
 * \param modes  List list of context-mode structures to be searched.
 * \param vid    Visual ID to be found.
 * \returns A pointer to a context-mode in \c modes if \c vid was found in
 *          the list, or \c NULL if it was not.
 */

__GLcontextModes *
_gl_context_modes_find_visual( __GLcontextModes * modes, int vid )
{
    while ( modes != NULL ) {
	if ( modes->visualID == vid ) {
	    break;
	}

	modes = modes->next;
    }

    return modes;
}


/**
 * Determine if two context-modes are the same.  This is intended to be used
 * by libGL implementations to compare to sets of driver generated FBconfigs.
 * 
 * \param a  Context-mode to be compared.
 * \param b  Context-mode to be compared.
 * \returns \c GL_TRUE if the two context-modes are the same.  \c GL_FALSE is
 *          returned otherwise.
 */
GLboolean
_gl_context_modes_are_same( const __GLcontextModes * a,
			    const __GLcontextModes * b )
{
    return( (a->rgbMode == b->rgbMode) &&
	    (a->floatMode == b->floatMode) &&
	    (a->colorIndexMode == b->colorIndexMode) &&
	    (a->doubleBufferMode == b->doubleBufferMode) &&
	    (a->stereoMode == b->stereoMode) &&
	    (a->redBits == b->redBits) &&
	    (a->greenBits == b->greenBits) &&
	    (a->blueBits == b->blueBits) &&
	    (a->alphaBits == b->alphaBits) &&
#if 0 /* For some reason these don't get set on the client-side in libGL. */
	    (a->redMask == b->redMask) &&
	    (a->greenMask == b->greenMask) &&
	    (a->blueMask == b->blueMask) &&
	    (a->alphaMask == b->alphaMask) &&
#endif
	    (a->rgbBits == b->rgbBits) &&
	    (a->indexBits == b->indexBits) &&
	    (a->accumRedBits == b->accumRedBits) &&
	    (a->accumGreenBits == b->accumGreenBits) &&
	    (a->accumBlueBits == b->accumBlueBits) &&
	    (a->accumAlphaBits == b->accumAlphaBits) &&
	    (a->depthBits == b->depthBits) &&
	    (a->stencilBits == b->stencilBits) &&
	    (a->numAuxBuffers == b->numAuxBuffers) &&
	    (a->level == b->level) &&
	    (a->pixmapMode == b->pixmapMode) &&
	    (a->visualRating == b->visualRating) &&

	    (a->transparentPixel == b->transparentPixel) &&

	    ((a->transparentPixel != GLX_TRANSPARENT_RGB) ||
	     ((a->transparentRed == b->transparentRed) &&
	      (a->transparentGreen == b->transparentGreen) &&
	      (a->transparentBlue == b->transparentBlue) &&
	      (a->transparentAlpha == b->transparentAlpha))) &&

	    ((a->transparentPixel != GLX_TRANSPARENT_INDEX) || 
	     (a->transparentIndex == b->transparentIndex)) &&

	    (a->sampleBuffers == b->sampleBuffers) &&
	    (a->samples == b->samples) &&
	    ((a->drawableType & b->drawableType) != 0) &&
	    (a->renderType == b->renderType) &&
	    (a->maxPbufferWidth == b->maxPbufferWidth) &&
	    (a->maxPbufferHeight == b->maxPbufferHeight) &&
	    (a->maxPbufferPixels == b->maxPbufferPixels) &&
	    (a->optimalPbufferWidth == b->optimalPbufferWidth) &&
	    (a->optimalPbufferHeight == b->optimalPbufferHeight) &&
	    (a->swapMethod == b->swapMethod) );
}