Retire miniglx and move the actual glx code up to src/glx

1 files changed, 751 insertions, 0 deletions

diff --git a/src/glx/dri_glx.c b/src/glx/dri_glx.c
new file mode 100644
index 00000000000..0ff53c324f5
--- /dev/null
+++ b/src/glx/dri_glx.c
@@ -0,0 +1,751 @@
+/**************************************************************************
+
+Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
+All Rights Reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sub license, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice (including the
+next paragraph) shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
+ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+**************************************************************************/
+
+/*
+ * Authors:
+ *   Kevin E. Martin <kevin@precisioninsight.com>
+ *   Brian Paul <brian@precisioninsight.com>
+ *
+ */
+
+#ifdef GLX_DIRECT_RENDERING
+
+#include <X11/Xlib.h>
+#include <X11/extensions/Xfixes.h>
+#include <X11/extensions/Xdamage.h>
+#include "glxclient.h"
+#include "xf86dri.h"
+#include "dri2.h"
+#include "sarea.h"
+#include <dlfcn.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include "xf86drm.h"
+#include "dri_common.h"
+
+typedef struct __GLXDRIdisplayPrivateRec __GLXDRIdisplayPrivate;
+typedef struct __GLXDRIcontextPrivateRec __GLXDRIcontextPrivate;
+
+struct __GLXDRIdisplayPrivateRec
+{
+   __GLXDRIdisplay base;
+
+   /*
+    ** XFree86-DRI version information
+    */
+   int driMajor;
+   int driMinor;
+   int driPatch;
+};
+
+struct __GLXDRIcontextPrivateRec
+{
+   __GLXDRIcontext base;
+   __DRIcontext *driContext;
+   XID hwContextID;
+   __GLXscreenConfigs *psc;
+};
+
+/*
+ * Given a display pointer and screen number, determine the name of
+ * the DRI driver for the screen. (I.e. "r128", "tdfx", etc).
+ * Return True for success, False for failure.
+ */
+static Bool
+driGetDriverName(Display * dpy, int scrNum, char **driverName)
+{
+   int directCapable;
+   Bool b;
+   int event, error;
+   int driverMajor, driverMinor, driverPatch;
+
+   *driverName = NULL;
+
+   if (XF86DRIQueryExtension(dpy, &event, &error)) {    /* DRI1 */
+      if (!XF86DRIQueryDirectRenderingCapable(dpy, scrNum, &directCapable)) {
+         ErrorMessageF("XF86DRIQueryDirectRenderingCapable failed\n");
+         return False;
+      }
+      if (!directCapable) {
+         ErrorMessageF("XF86DRIQueryDirectRenderingCapable returned false\n");
+         return False;
+      }
+
+      b = XF86DRIGetClientDriverName(dpy, scrNum, &driverMajor, &driverMinor,
+                                     &driverPatch, driverName);
+      if (!b) {
+         ErrorMessageF("Cannot determine driver name for screen %d\n",
+                       scrNum);
+         return False;
+      }
+
+      InfoMessageF("XF86DRIGetClientDriverName: %d.%d.%d %s (screen %d)\n",
+                   driverMajor, driverMinor, driverPatch, *driverName,
+                   scrNum);
+
+      return True;
+   }
+   else if (DRI2QueryExtension(dpy, &event, &error)) {  /* DRI2 */
+      char *dev;
+      Bool ret = DRI2Connect(dpy, RootWindow(dpy, scrNum), driverName, &dev);
+
+      if (ret)
+         Xfree(dev);
+
+      return ret;
+   }
+
+   return False;
+}
+
+/*
+ * Exported function for querying the DRI driver for a given screen.
+ *
+ * The returned char pointer points to a static array that will be
+ * overwritten by subsequent calls.
+ */
+PUBLIC const char *
+glXGetScreenDriver(Display * dpy, int scrNum)
+{
+   static char ret[32];
+   char *driverName;
+   if (driGetDriverName(dpy, scrNum, &driverName)) {
+      int len;
+      if (!driverName)
+         return NULL;
+      len = strlen(driverName);
+      if (len >= 31)
+         return NULL;
+      memcpy(ret, driverName, len + 1);
+      Xfree(driverName);
+      return ret;
+   }
+   return NULL;
+}
+
+/*
+ * Exported function for obtaining a driver's option list (UTF-8 encoded XML).
+ *
+ * The returned char pointer points directly into the driver. Therefore
+ * it should be treated as a constant.
+ *
+ * If the driver was not found or does not support configuration NULL is
+ * returned.
+ *
+ * Note: The driver remains opened after this function returns.
+ */
+PUBLIC const char *
+glXGetDriverConfig(const char *driverName)
+{
+   void *handle = driOpenDriver(driverName);
+   if (handle)
+      return dlsym(handle, "__driConfigOptions");
+   else
+      return NULL;
+}
+
+#ifdef XDAMAGE_1_1_INTERFACE
+
+static GLboolean
+has_damage_post(Display * dpy)
+{
+   static GLboolean inited = GL_FALSE;
+   static GLboolean has_damage;
+
+   if (!inited) {
+      int major, minor;
+
+      if (XDamageQueryVersion(dpy, &major, &minor) &&
+          major == 1 && minor >= 1) {
+         has_damage = GL_TRUE;
+      }
+      else {
+         has_damage = GL_FALSE;
+      }
+      inited = GL_TRUE;
+   }
+
+   return has_damage;
+}
+
+static void
+__glXReportDamage(__DRIdrawable * driDraw,
+                  int x, int y,
+                  drm_clip_rect_t * rects, int num_rects,
+                  GLboolean front_buffer, void *loaderPrivate)
+{
+   XRectangle *xrects;
+   XserverRegion region;
+   int i;
+   int x_off, y_off;
+   __GLXDRIdrawable *glxDraw = loaderPrivate;
+   __GLXscreenConfigs *psc = glxDraw->psc;
+   Display *dpy = psc->dpy;
+   Drawable drawable;
+
+   if (!has_damage_post(dpy))
+      return;
+
+   if (front_buffer) {
+      x_off = x;
+      y_off = y;
+      drawable = RootWindow(dpy, psc->scr);
+   }
+   else {
+      x_off = 0;
+      y_off = 0;
+      drawable = glxDraw->xDrawable;
+   }
+
+   xrects = malloc(sizeof(XRectangle) * num_rects);
+   if (xrects == NULL)
+      return;
+
+   for (i = 0; i < num_rects; i++) {
+      xrects[i].x = rects[i].x1 + x_off;
+      xrects[i].y = rects[i].y1 + y_off;
+      xrects[i].width = rects[i].x2 - rects[i].x1;
+      xrects[i].height = rects[i].y2 - rects[i].y1;
+   }
+   region = XFixesCreateRegion(dpy, xrects, num_rects);
+   free(xrects);
+   XDamageAdd(dpy, drawable, region);
+   XFixesDestroyRegion(dpy, region);
+}
+
+static const __DRIdamageExtension damageExtension = {
+   {__DRI_DAMAGE, __DRI_DAMAGE_VERSION},
+   __glXReportDamage,
+};
+
+#endif
+
+static GLboolean
+__glXDRIGetDrawableInfo(__DRIdrawable * drawable,
+                        unsigned int *index, unsigned int *stamp,
+                        int *X, int *Y, int *W, int *H,
+                        int *numClipRects, drm_clip_rect_t ** pClipRects,
+                        int *backX, int *backY,
+                        int *numBackClipRects,
+                        drm_clip_rect_t ** pBackClipRects,
+                        void *loaderPrivate)
+{
+   __GLXDRIdrawable *glxDraw = loaderPrivate;
+   __GLXscreenConfigs *psc = glxDraw->psc;
+   Display *dpy = psc->dpy;
+
+   return XF86DRIGetDrawableInfo(dpy, psc->scr, glxDraw->drawable,
+                                 index, stamp, X, Y, W, H,
+                                 numClipRects, pClipRects,
+                                 backX, backY,
+                                 numBackClipRects, pBackClipRects);
+}
+
+static const __DRIgetDrawableInfoExtension getDrawableInfoExtension = {
+   {__DRI_GET_DRAWABLE_INFO, __DRI_GET_DRAWABLE_INFO_VERSION},
+   __glXDRIGetDrawableInfo
+};
+
+static const __DRIextension *loader_extensions[] = {
+   &systemTimeExtension.base,
+   &getDrawableInfoExtension.base,
+#ifdef XDAMAGE_1_1_INTERFACE
+   &damageExtension.base,
+#endif
+   NULL
+};
+
+/**
+ * Perform the required libGL-side initialization and call the client-side
+ * driver's \c __driCreateNewScreen function.
+ * 
+ * \param dpy    Display pointer.
+ * \param scrn   Screen number on the display.
+ * \param psc    DRI screen information.
+ * \param driDpy DRI display information.
+ * \param createNewScreen  Pointer to the client-side driver's
+ *               \c __driCreateNewScreen function.
+ * \returns A pointer to the \c __DRIscreen structure returned by
+ *          the client-side driver on success, or \c NULL on failure.
+ */
+static void *
+CallCreateNewScreen(Display * dpy, int scrn, __GLXscreenConfigs * psc,
+                    __GLXDRIdisplayPrivate * driDpy)
+{
+   void *psp = NULL;
+   drm_handle_t hSAREA;
+   drmAddress pSAREA = MAP_FAILED;
+   char *BusID;
+   __DRIversion ddx_version;
+   __DRIversion dri_version;
+   __DRIversion drm_version;
+   __DRIframebuffer framebuffer;
+   int fd = -1;
+   int status;
+
+   drm_magic_t magic;
+   drmVersionPtr version;
+   int newlyopened;
+   char *driverName;
+   drm_handle_t hFB;
+   int junk;
+   const __DRIconfig **driver_configs;
+   __GLcontextModes *visual;
+
+   /* DRI protocol version. */
+   dri_version.major = driDpy->driMajor;
+   dri_version.minor = driDpy->driMinor;
+   dri_version.patch = driDpy->driPatch;
+
+   framebuffer.base = MAP_FAILED;
+   framebuffer.dev_priv = NULL;
+
+   if (!XF86DRIOpenConnection(dpy, scrn, &hSAREA, &BusID)) {
+      ErrorMessageF("XF86DRIOpenConnection failed\n");
+      goto handle_error;
+   }
+
+   fd = drmOpenOnce(NULL, BusID, &newlyopened);
+
+   Xfree(BusID);                /* No longer needed */
+
+   if (fd < 0) {
+      ErrorMessageF("drmOpenOnce failed (%s)\n", strerror(-fd));
+      goto handle_error;
+   }
+
+   if (drmGetMagic(fd, &magic)) {
+      ErrorMessageF("drmGetMagic failed\n");
+      goto handle_error;
+   }
+
+   version = drmGetVersion(fd);
+   if (version) {
+      drm_version.major = version->version_major;
+      drm_version.minor = version->version_minor;
+      drm_version.patch = version->version_patchlevel;
+      drmFreeVersion(version);
+   }
+   else {
+      drm_version.major = -1;
+      drm_version.minor = -1;
+      drm_version.patch = -1;
+   }
+
+   if (newlyopened && !XF86DRIAuthConnection(dpy, scrn, magic)) {
+      ErrorMessageF("XF86DRIAuthConnection failed\n");
+      goto handle_error;
+   }
+
+   /* Get device name (like "tdfx") and the ddx version numbers.
+    * We'll check the version in each DRI driver's "createNewScreen"
+    * function. */
+   if (!XF86DRIGetClientDriverName(dpy, scrn,
+                                   &ddx_version.major,
+                                   &ddx_version.minor,
+                                   &ddx_version.patch, &driverName)) {
+      ErrorMessageF("XF86DRIGetClientDriverName failed\n");
+      goto handle_error;
+   }
+
+   Xfree(driverName);           /* No longer needed. */
+
+   /*
+    * Get device-specific info.  pDevPriv will point to a struct
+    * (such as DRIRADEONRec in xfree86/driver/ati/radeon_dri.h) that
+    * has information about the screen size, depth, pitch, ancilliary
+    * buffers, DRM mmap handles, etc.
+    */
+   if (!XF86DRIGetDeviceInfo(dpy, scrn, &hFB, &junk,
+                             &framebuffer.size, &framebuffer.stride,
+                             &framebuffer.dev_priv_size,
+                             &framebuffer.dev_priv)) {
+      ErrorMessageF("XF86DRIGetDeviceInfo failed");
+      goto handle_error;
+   }
+
+   framebuffer.width = DisplayWidth(dpy, scrn);
+   framebuffer.height = DisplayHeight(dpy, scrn);
+
+   /* Map the framebuffer region. */
+   status = drmMap(fd, hFB, framebuffer.size,
+                   (drmAddressPtr) & framebuffer.base);
+   if (status != 0) {
+      ErrorMessageF("drmMap of framebuffer failed (%s)", strerror(-status));
+      goto handle_error;
+   }
+
+   /* Map the SAREA region.  Further mmap regions may be setup in
+    * each DRI driver's "createNewScreen" function.
+    */
+   status = drmMap(fd, hSAREA, SAREA_MAX, &pSAREA);
+   if (status != 0) {
+      ErrorMessageF("drmMap of SAREA failed (%s)", strerror(-status));
+      goto handle_error;
+   }
+
+   psp = (*psc->legacy->createNewScreen) (scrn,
+                                          &ddx_version,
+                                          &dri_version,
+                                          &drm_version,
+                                          &framebuffer,
+                                          pSAREA,
+                                          fd,
+                                          loader_extensions,
+                                          &driver_configs, psc);
+
+   if (psp == NULL) {
+      ErrorMessageF("Calling driver entry point failed");
+      goto handle_error;
+   }
+
+   psc->configs = driConvertConfigs(psc->core, psc->configs, driver_configs);
+   psc->visuals = driConvertConfigs(psc->core, psc->visuals, driver_configs);
+
+   psc->driver_configs = driver_configs;
+
+   /* Visuals with depth != screen depth are subject to automatic compositing
+    * in the X server, so DRI1 can't render to them properly. Mark them as
+    * non-conformant to prevent apps from picking them up accidentally.
+    */
+   for (visual = psc->visuals; visual; visual = visual->next) {
+      XVisualInfo template;
+      XVisualInfo *visuals;
+      int num_visuals;
+      long mask;
+
+      template.visualid = visual->visualID;
+      mask = VisualIDMask;
+      visuals = XGetVisualInfo(dpy, mask, &template, &num_visuals);
+
+      if (visuals) {
+         if (num_visuals > 0 && visuals->depth != DefaultDepth(dpy, scrn))
+            visual->visualRating = GLX_NON_CONFORMANT_CONFIG;
+
+         XFree(visuals);
+      }
+   }
+
+   return psp;
+
+ handle_error:
+   if (pSAREA != MAP_FAILED)
+      drmUnmap(pSAREA, SAREA_MAX);
+
+   if (framebuffer.base != MAP_FAILED)
+      drmUnmap((drmAddress) framebuffer.base, framebuffer.size);
+
+   if (framebuffer.dev_priv != NULL)
+      Xfree(framebuffer.dev_priv);
+
+   if (fd >= 0)
+      drmCloseOnce(fd);
+
+   XF86DRICloseConnection(dpy, scrn);
+
+   ErrorMessageF("reverting to software direct rendering\n");
+
+   return NULL;
+}
+
+static void
+driDestroyContext(__GLXDRIcontext * context,
+                  __GLXscreenConfigs * psc, Display * dpy)
+{
+   __GLXDRIcontextPrivate *pcp = (__GLXDRIcontextPrivate *) context;
+
+   (*psc->core->destroyContext) (pcp->driContext);
+
+   XF86DRIDestroyContext(psc->dpy, psc->scr, pcp->hwContextID);
+   Xfree(pcp);
+}
+
+static Bool
+driBindContext(__GLXDRIcontext * context,
+               __GLXDRIdrawable * draw, __GLXDRIdrawable * read)
+{
+   __GLXDRIcontextPrivate *pcp = (__GLXDRIcontextPrivate *) context;
+   const __DRIcoreExtension *core = pcp->psc->core;
+
+   return (*core->bindContext) (pcp->driContext,
+                                draw->driDrawable, read->driDrawable);
+}
+
+static void
+driUnbindContext(__GLXDRIcontext * context)
+{
+   __GLXDRIcontextPrivate *pcp = (__GLXDRIcontextPrivate *) context;
+   const __DRIcoreExtension *core = pcp->psc->core;
+
+   (*core->unbindContext) (pcp->driContext);
+}
+
+static __GLXDRIcontext *
+driCreateContext(__GLXscreenConfigs * psc,
+                 const __GLcontextModes * mode,
+                 GLXContext gc, GLXContext shareList, int renderType)
+{
+   __GLXDRIcontextPrivate *pcp, *pcp_shared;
+   drm_context_t hwContext;
+   __DRIcontext *shared = NULL;
+   __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) mode;
+
+   if (!psc || !psc->driScreen)
+      return NULL;
+
+   if (shareList) {
+      pcp_shared = (__GLXDRIcontextPrivate *) shareList->driContext;
+      shared = pcp_shared->driContext;
+   }
+
+   pcp = Xmalloc(sizeof *pcp);
+   if (pcp == NULL)
+      return NULL;
+
+   pcp->psc = psc;
+   if (!XF86DRICreateContextWithConfig(psc->dpy, psc->scr,
+                                       mode->visualID,
+                                       &pcp->hwContextID, &hwContext)) {
+      Xfree(pcp);
+      return NULL;
+   }
+
+   pcp->driContext =
+      (*psc->legacy->createNewContext) (psc->__driScreen,
+                                        config->driConfig,
+                                        renderType, shared, hwContext, pcp);
+   if (pcp->driContext == NULL) {
+      XF86DRIDestroyContext(psc->dpy, psc->scr, pcp->hwContextID);
+      Xfree(pcp);
+      return NULL;
+   }
+
+   pcp->base.destroyContext = driDestroyContext;
+   pcp->base.bindContext = driBindContext;
+   pcp->base.unbindContext = driUnbindContext;
+
+   return &pcp->base;
+}
+
+static void
+driDestroyDrawable(__GLXDRIdrawable * pdraw)
+{
+   __GLXscreenConfigs *psc = pdraw->psc;
+
+   (*psc->core->destroyDrawable) (pdraw->driDrawable);
+   XF86DRIDestroyDrawable(psc->dpy, psc->scr, pdraw->drawable);
+   Xfree(pdraw);
+}
+
+static __GLXDRIdrawable *
+driCreateDrawable(__GLXscreenConfigs * psc,
+                  XID xDrawable,
+                  GLXDrawable drawable, const __GLcontextModes * modes)
+{
+   __GLXDRIdrawable *pdraw;
+   drm_drawable_t hwDrawable;
+   void *empty_attribute_list = NULL;
+   __GLXDRIconfigPrivate *config = (__GLXDRIconfigPrivate *) modes;
+
+   /* Old dri can't handle GLX 1.3+ drawable constructors. */
+   if (xDrawable != drawable)
+      return NULL;
+
+   pdraw = Xmalloc(sizeof(*pdraw));
+   if (!pdraw)
+      return NULL;
+
+   pdraw->drawable = drawable;
+   pdraw->psc = psc;
+
+   if (!XF86DRICreateDrawable(psc->dpy, psc->scr, drawable, &hwDrawable)) {
+      Xfree(pdraw);
+      return NULL;
+   }
+
+   /* Create a new drawable */
+   pdraw->driDrawable =
+      (*psc->legacy->createNewDrawable) (psc->__driScreen,
+                                         config->driConfig,
+                                         hwDrawable,
+                                         GLX_WINDOW_BIT,
+                                         empty_attribute_list, pdraw);
+
+   if (!pdraw->driDrawable) {
+      XF86DRIDestroyDrawable(psc->dpy, psc->scr, drawable);
+      Xfree(pdraw);
+      return NULL;
+   }
+
+   pdraw->destroyDrawable = driDestroyDrawable;
+
+   return pdraw;
+}
+
+static int64_t
+driSwapBuffers(__GLXDRIdrawable * pdraw, int64_t unused1, int64_t unused2,
+	       int64_t unused3)
+{
+   (*pdraw->psc->core->swapBuffers) (pdraw->driDrawable);
+   return 0;
+}
+
+static void
+driCopySubBuffer(__GLXDRIdrawable * pdraw,
+                 int x, int y, int width, int height)
+{
+   (*pdraw->psc->driCopySubBuffer->copySubBuffer) (pdraw->driDrawable,
+                                                   x, y, width, height);
+}
+
+static void
+driDestroyScreen(__GLXscreenConfigs * psc)
+{
+   /* Free the direct rendering per screen data */
+   if (psc->__driScreen)
+      (*psc->core->destroyScreen) (psc->__driScreen);
+   psc->__driScreen = NULL;
+   if (psc->driver)
+      dlclose(psc->driver);
+}
+
+static __GLXDRIscreen *
+driCreateScreen(__GLXscreenConfigs * psc, int screen,
+                __GLXdisplayPrivate * priv)
+{
+   __GLXDRIdisplayPrivate *pdp;
+   __GLXDRIscreen *psp;
+   const __DRIextension **extensions;
+   char *driverName;
+   int i;
+
+   psp = Xcalloc(1, sizeof *psp);
+   if (psp == NULL)
+      return NULL;
+
+   /* Initialize per screen dynamic client GLX extensions */
+   psc->ext_list_first_time = GL_TRUE;
+
+   if (!driGetDriverName(priv->dpy, screen, &driverName)) {
+      Xfree(psp);
+      return NULL;
+   }
+
+   psc->driver = driOpenDriver(driverName);
+   Xfree(driverName);
+   if (psc->driver == NULL) {
+      Xfree(psp);
+      return NULL;
+   }
+
+   extensions = dlsym(psc->driver, __DRI_DRIVER_EXTENSIONS);
+   if (extensions == NULL) {
+      ErrorMessageF("driver exports no extensions (%s)\n", dlerror());
+      Xfree(psp);
+      return NULL;
+   }
+
+   for (i = 0; extensions[i]; i++) {
+      if (strcmp(extensions[i]->name, __DRI_CORE) == 0)
+	 psc->core = (__DRIcoreExtension *) extensions[i];
+      if (strcmp(extensions[i]->name, __DRI_LEGACY) == 0)
+	 psc->legacy = (__DRIlegacyExtension *) extensions[i];
+   }
+
+   if (psc->core == NULL || psc->legacy == NULL) {
+      Xfree(psp);
+      return NULL;
+   }
+
+   pdp = (__GLXDRIdisplayPrivate *) priv->driDisplay;
+   psc->__driScreen = CallCreateNewScreen(psc->dpy, screen, psc, pdp);
+   if (psc->__driScreen == NULL) {
+      dlclose(psc->driver);
+      Xfree(psp);
+      return NULL;
+   }
+
+   driBindExtensions(psc);
+   driBindCommonExtensions(psc);
+
+   if (psc->driCopySubBuffer)
+      psp->copySubBuffer = driCopySubBuffer;
+
+   psp->destroyScreen = driDestroyScreen;
+   psp->createContext = driCreateContext;
+   psp->createDrawable = driCreateDrawable;
+   psp->swapBuffers = driSwapBuffers;
+   psp->waitX = NULL;
+   psp->waitGL = NULL;
+
+   return psp;
+}
+
+/* Called from __glXFreeDisplayPrivate.
+ */
+static void
+driDestroyDisplay(__GLXDRIdisplay * dpy)
+{
+   Xfree(dpy);
+}
+
+/*
+ * Allocate, initialize and return a __DRIdisplayPrivate object.
+ * This is called from __glXInitialize() when we are given a new
+ * display pointer.
+ */
+_X_HIDDEN __GLXDRIdisplay *
+driCreateDisplay(Display * dpy)
+{
+   __GLXDRIdisplayPrivate *pdpyp;
+   int eventBase, errorBase;
+   int major, minor, patch;
+
+   if (!XF86DRIQueryExtension(dpy, &eventBase, &errorBase)) {
+      return NULL;
+   }
+
+   if (!XF86DRIQueryVersion(dpy, &major, &minor, &patch)) {
+      return NULL;
+   }
+
+   pdpyp = Xmalloc(sizeof *pdpyp);
+   if (!pdpyp) {
+      return NULL;
+   }
+
+   pdpyp->driMajor = major;
+   pdpyp->driMinor = minor;
+   pdpyp->driPatch = patch;
+
+   pdpyp->base.destroyDisplay = driDestroyDisplay;
+   pdpyp->base.createScreen = driCreateScreen;
+
+   return &pdpyp->base;
+}
+
+#endif /* GLX_DIRECT_RENDERING */