glxcmds.c

来自「mesa-6.5-minigui源码」· C语言 代码 · 共 2,495 行 · 第 1/5 页

    }
}

PUBLIC void glXDestroyContext(Display *dpy, GLXContext gc)
{
    DestroyContext(dpy, gc);
}

/*
** Return the major and minor version #s for the GLX extension
*/
PUBLIC Bool glXQueryVersion(Display *dpy, int *major, int *minor)
{
    __GLXdisplayPrivate *priv;

    /* Init the extension.  This fetches the major and minor version. */
    priv = __glXInitialize(dpy);
    if (!priv) return GL_FALSE;

    if (major) *major = priv->majorVersion;
    if (minor) *minor = priv->minorVersion;
    return GL_TRUE;
}

/*
** Query the existance of the GLX extension
*/
PUBLIC Bool glXQueryExtension(Display *dpy, int *errorBase, int *eventBase)
{
    int major_op, erb, evb;
    Bool rv;

    rv = XQueryExtension(dpy, GLX_EXTENSION_NAME, &major_op, &evb, &erb);
    if (rv) {
	if (errorBase) *errorBase = erb;
	if (eventBase) *eventBase = evb;
    }
    return rv;
}

/*
** Put a barrier in the token stream that forces the GL to finish its
** work before X can proceed.
*/
PUBLIC void glXWaitGL(void)
{
    xGLXWaitGLReq *req;
    GLXContext gc = __glXGetCurrentContext();
    Display *dpy = gc->currentDpy;

    if (!dpy) return;

    /* Flush any pending commands out */
    __glXFlushRenderBuffer(gc, gc->pc);

#ifdef GLX_DIRECT_RENDERING
    if (gc->isDirect) {
/* This bit of ugliness unwraps the glFinish function */
#ifdef glFinish
#undef glFinish
#endif
	glFinish();
	return;
    }
#endif

    /* Send the glXWaitGL request */
    LockDisplay(dpy);
    GetReq(GLXWaitGL,req);
    req->reqType = gc->majorOpcode;
    req->glxCode = X_GLXWaitGL;
    req->contextTag = gc->currentContextTag;
    UnlockDisplay(dpy);
    SyncHandle();
}

/*
** Put a barrier in the token stream that forces X to finish its
** work before GL can proceed.
*/
PUBLIC void glXWaitX(void)
{
    xGLXWaitXReq *req;
    GLXContext gc = __glXGetCurrentContext();
    Display *dpy = gc->currentDpy;

    if (!dpy) return;

    /* Flush any pending commands out */
    __glXFlushRenderBuffer(gc, gc->pc);

#ifdef GLX_DIRECT_RENDERING
    if (gc->isDirect) {
	XSync(dpy, False);
	return;
    }
#endif

    /*
    ** Send the glXWaitX request.
    */
    LockDisplay(dpy);
    GetReq(GLXWaitX,req);
    req->reqType = gc->majorOpcode;
    req->glxCode = X_GLXWaitX;
    req->contextTag = gc->currentContextTag;
    UnlockDisplay(dpy);
    SyncHandle();
}

PUBLIC void glXUseXFont(Font font, int first, int count, int listBase)
{
    xGLXUseXFontReq *req;
    GLXContext gc = __glXGetCurrentContext();
    Display *dpy = gc->currentDpy;

    if (!dpy) return;

    /* Flush any pending commands out */
    (void) __glXFlushRenderBuffer(gc, gc->pc);

#ifdef GLX_DIRECT_RENDERING
    if (gc->isDirect) {
      DRI_glXUseXFont(font, first, count, listBase);
      return;
    }
#endif

    /* Send the glXUseFont request */
    LockDisplay(dpy);
    GetReq(GLXUseXFont,req);
    req->reqType = gc->majorOpcode;
    req->glxCode = X_GLXUseXFont;
    req->contextTag = gc->currentContextTag;
    req->font = font;
    req->first = first;
    req->count = count;
    req->listBase = listBase;
    UnlockDisplay(dpy);
    SyncHandle();
}

/************************************************************************/

/*
** Copy the source context to the destination context using the
** attribute "mask".
*/
PUBLIC void glXCopyContext(Display *dpy, GLXContext source,
			   GLXContext dest, unsigned long mask)
{
    xGLXCopyContextReq *req;
    GLXContext gc = __glXGetCurrentContext();
    GLXContextTag tag;
    CARD8 opcode;

    opcode = __glXSetupForCommand(dpy);
    if (!opcode) {
	return;
    }

#ifdef GLX_DIRECT_RENDERING
    if (gc->isDirect) {
	/* NOT_DONE: This does not work yet */
    }
#endif

    /*
    ** If the source is the current context, send its tag so that the context
    ** can be flushed before the copy.
    */
    if (source == gc && dpy == gc->currentDpy) {
	tag = gc->currentContextTag;
    } else {
	tag = 0;
    }

    /* Send the glXCopyContext request */
    LockDisplay(dpy);
    GetReq(GLXCopyContext,req);
    req->reqType = opcode;
    req->glxCode = X_GLXCopyContext;
    req->source = source ? source->xid : None;
    req->dest = dest ? dest->xid : None;
    req->mask = mask;
    req->contextTag = tag;
    UnlockDisplay(dpy);
    SyncHandle();
}


/**
 * Determine if a context uses direct rendering.
 *
 * \param dpy        Display where the context was created.
 * \param contextID  ID of the context to be tested.
 *
 * \returns \c GL_TRUE if the context is direct rendering or not.
 */
static Bool __glXIsDirect(Display *dpy, GLXContextID contextID)
{
    xGLXIsDirectReq *req;
    xGLXIsDirectReply reply;
    CARD8 opcode;

    opcode = __glXSetupForCommand(dpy);
    if (!opcode) {
	return GL_FALSE;
    }

    /* Send the glXIsDirect request */
    LockDisplay(dpy);
    GetReq(GLXIsDirect,req);
    req->reqType = opcode;
    req->glxCode = X_GLXIsDirect;
    req->context = contextID;
    _XReply(dpy, (xReply*) &reply, 0, False);
    UnlockDisplay(dpy);
    SyncHandle();

    return reply.isDirect;
}

/**
 * \todo
 * Shouldn't this function \b always return \c GL_FALSE when
 * \c GLX_DIRECT_RENDERING is not defined?  Do we really need to bother with
 * the GLX protocol here at all?
 */
PUBLIC Bool glXIsDirect(Display *dpy, GLXContext gc)
{
    if (!gc) {
	return GL_FALSE;
#ifdef GLX_DIRECT_RENDERING
    } else if (gc->isDirect) {
	return GL_TRUE;
#endif
    }
    return __glXIsDirect(dpy, gc->xid);
}

PUBLIC GLXPixmap glXCreateGLXPixmap(Display *dpy, XVisualInfo *vis, 
				    Pixmap pixmap)
{
    xGLXCreateGLXPixmapReq *req;
    GLXPixmap xid;
    CARD8 opcode;

    opcode = __glXSetupForCommand(dpy);
    if (!opcode) {
	return None;
    }

    /* Send the glXCreateGLXPixmap request */
    LockDisplay(dpy);
    GetReq(GLXCreateGLXPixmap,req);
    req->reqType = opcode;
    req->glxCode = X_GLXCreateGLXPixmap;
    req->screen = vis->screen;
    req->visual = vis->visualid;
    req->pixmap = pixmap;
    req->glxpixmap = xid = XAllocID(dpy);
    UnlockDisplay(dpy);
    SyncHandle();
    return xid;
}

/*
** Destroy the named pixmap
*/
PUBLIC void glXDestroyGLXPixmap(Display *dpy, GLXPixmap glxpixmap)
{
    xGLXDestroyGLXPixmapReq *req;
    CARD8 opcode;

    opcode = __glXSetupForCommand(dpy);
    if (!opcode) {
	return;
    }
    
    /* Send the glXDestroyGLXPixmap request */
    LockDisplay(dpy);
    GetReq(GLXDestroyGLXPixmap,req);
    req->reqType = opcode;
    req->glxCode = X_GLXDestroyGLXPixmap;
    req->glxpixmap = glxpixmap;
    UnlockDisplay(dpy);
    SyncHandle();
}

PUBLIC void glXSwapBuffers(Display *dpy, GLXDrawable drawable)
{
    xGLXSwapBuffersReq *req;
    GLXContext gc;
    GLXContextTag tag;
    CARD8 opcode;
#ifdef GLX_DIRECT_RENDERING
    __DRIdrawable *pdraw = GetDRIDrawable( dpy, drawable, NULL );

    if ( pdraw != NULL ) {
	(*pdraw->swapBuffers)(dpy, pdraw->private);
	return;
    }
#endif

    opcode = __glXSetupForCommand(dpy);
    if (!opcode) {
	return;
    }

    /*
    ** The calling thread may or may not have a current context.  If it
    ** does, send the context tag so the server can do a flush.
    */
    gc = __glXGetCurrentContext();
    if ((gc != NULL) && (dpy == gc->currentDpy) && 
 	((drawable == gc->currentDrawable) || (drawable == gc->currentReadable)) ) {
	tag = gc->currentContextTag;
    } else {
	tag = 0;
    }

    /* Send the glXSwapBuffers request */
    LockDisplay(dpy);
    GetReq(GLXSwapBuffers,req);
    req->reqType = opcode;
    req->glxCode = X_GLXSwapBuffers;
    req->drawable = drawable;
    req->contextTag = tag;
    UnlockDisplay(dpy);
    SyncHandle();
    XFlush(dpy);
}


/*
** Return configuration information for the given display, screen and
** visual combination.
*/
PUBLIC int glXGetConfig(Display *dpy, XVisualInfo *vis, int attribute,
			int *value_return)
{
    __GLXdisplayPrivate *priv;
    __GLXscreenConfigs *psc;
    int   status;

    status = GetGLXPrivScreenConfig( dpy, vis->screen, & priv, & psc );
    if ( status == Success ) {
	const __GLcontextModes * const modes = _gl_context_modes_find_visual(
					     psc->configs, vis->visualid );

	/* Lookup attribute after first finding a match on the visual */
	if ( modes != NULL ) {
	    return _gl_get_context_mode_data( modes, attribute, value_return );
	}
	
	status = GLX_BAD_VISUAL;
    }

    /*
    ** If we can't find the config for this visual, this visual is not
    ** supported by the OpenGL implementation on the server.
    */
    if ( (status == GLX_BAD_VISUAL) && (attribute == GLX_USE_GL) ) {
	*value_return = GL_FALSE;
	status = Success;
    }

    return status;
}

/************************************************************************/

static void
init_fbconfig_for_chooser( __GLcontextModes * config,
			   GLboolean fbconfig_style_tags )
{
    memset( config, 0, sizeof( __GLcontextModes ) );
    config->visualID = (XID) GLX_DONT_CARE;
    config->visualType = GLX_DONT_CARE;

    /* glXChooseFBConfig specifies different defaults for these two than
     * glXChooseVisual.
     */
    if ( fbconfig_style_tags ) {
	config->rgbMode = GL_TRUE;
	config->doubleBufferMode = GLX_DONT_CARE;
    }

    config->visualRating = GLX_DONT_CARE;
    config->transparentPixel = GLX_NONE;
    config->transparentRed = GLX_DONT_CARE;
    config->transparentGreen = GLX_DONT_CARE;
    config->transparentBlue = GLX_DONT_CARE;
    config->transparentAlpha = GLX_DONT_CARE;
    config->transparentIndex = GLX_DONT_CARE;

    config->drawableType = GLX_WINDOW_BIT;
    config->renderType = (config->rgbMode) ? GLX_RGBA_BIT : GLX_COLOR_INDEX_BIT;
    config->xRenderable = GLX_DONT_CARE;
    config->fbconfigID = (GLXFBConfigID)(GLX_DONT_CARE);

    config->swapMethod = GLX_DONT_CARE;
}

#define MATCH_DONT_CARE( param ) \
	do { \
	    if ( (a-> param != GLX_DONT_CARE) \
		 && (a-> param != b-> param) ) { \
		return False; \
	    } \
	} while ( 0 )

#define MATCH_MINIMUM( param ) \
	do { \
	    if ( (a-> param != GLX_DONT_CARE) \
		 && (a-> param > b-> param) ) { \
		return False; \
	    } \
	} while ( 0 )

#define MATCH_EXACT( param ) \
	do { \
	    if ( a-> param != b-> param) { \
		return False; \
	    } \
	} while ( 0 )

/**
 * Determine if two GLXFBConfigs are compatible.
 *
 * \param a  Application specified config to test.
 * \param b  Server specified config to test against \c a.
 */
static Bool
fbconfigs_compatible( const __GLcontextModes * const a,
		      const __GLcontextModes * const b )
{
    MATCH_DONT_CARE( doubleBufferMode );
    MATCH_DONT_CARE( visualType );
    MATCH_DONT_CARE( visualRating );
    MATCH_DONT_CARE( xRenderable );
    MATCH_DONT_CARE( fbconfigID );
    MATCH_DONT_CARE( swapMethod );

    MATCH_MINIMUM( rgbBits );
    MATCH_MINIMUM( numAuxBuffers );
    MATCH_MINIMUM( redBits );
    MATCH_MINIMUM( greenBits );
    MATCH_MINIMUM( blueBits );
    MATCH_MINIMUM( alphaBits );
    MATCH_MINIMUM( depthBits );
    MATCH_MINIMUM( stencilBits );
    MATCH_MINIMUM( accumRedBits );
    MATCH_MINIMUM( accumGreenBits );
    MATCH_MINIMUM( accumBlueBits );
    MATCH_MINIMUM( accumAlphaBits );
    MATCH_MINIMUM( sampleBuffers );
    MATCH_MINIMUM( maxPbufferWidth );
    MATCH_MINIMUM( maxPbufferHeight );
    MATCH_MINIMUM( maxPbufferPixels );
    MATCH_MINIMUM( samples );

    MATCH_DONT_CARE( stereoMode );
    MATCH_EXACT( level );

    if ( ((a->drawableType & b->drawableType) == 0)
	 || ((a->renderType & b->renderType) == 0) ) {
	return False;
    }


    /* There is a bug in a few of the XFree86 DDX drivers.  They contain
     * visuals with a "transparent type" of 0 when they really mean GLX_NONE.
     * Technically speaking, it is a bug in the DDX driver, but there is
     * enough of an installed base to work around the problem here.  In any
     * case, 0 is not a valid value of the transparent type, so we'll treat 0 
     * from the app as GLX_DONT_CARE. We'll consider GLX_NONE from the app and
     * 0 from the server to be a match to maintain backward compatibility with
     * the (broken) drivers.
     */

    if ( a->transparentPixel != GLX_DONT_CARE
         && a->transparentPixel != 0 ) {
        if ( a->transparentPixel == GLX_NONE ) {
            if ( b->transparentPixel != GLX_NONE && b->transparentPixel != 0 )
                return False;
        } else {
            MATCH_EXACT( transparentPixel );
        }

	switch ( a->transparentPixel ) {
	  case GLX_TRANSPARENT_RGB:
	    MATCH_DONT_CARE( transparentRed );
	    MATCH_DONT_CARE( transparentGreen );
	    MATCH_DONT_CARE( transparentBlue );
	    MATCH_DONT_CARE( transparentAlpha );
	    break;