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

1 files changed, 1060 insertions, 0 deletions

diff --git a/src/glx/glxext.c b/src/glx/glxext.c
new file mode 100644
index 0000000000..c2de1a3fff
--- /dev/null
+++ b/src/glx/glxext.c
@@ -0,0 +1,1060 @@
+/*
+ * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
+ * Copyright (C) 1991-2000 Silicon Graphics, Inc. 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, sublicense,
+ * 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 including the dates of first publication and
+ * either this permission notice or a reference to
+ * http://oss.sgi.com/projects/FreeB/
+ * 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 NONINFRINGEMENT. IN NO EVENT SHALL
+ * SILICON GRAPHICS, INC. 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.
+ *
+ * Except as contained in this notice, the name of Silicon Graphics, Inc.
+ * shall not be used in advertising or otherwise to promote the sale, use or
+ * other dealings in this Software without prior written authorization from
+ * Silicon Graphics, Inc.
+ */
+
+/**
+ * \file glxext.c
+ * GLX protocol interface boot-strap code.
+ *
+ * Direct rendering support added by Precision Insight, Inc.
+ *
+ * \author Kevin E. Martin <kevin@precisioninsight.com>
+ */
+
+#include <assert.h>
+#include "glxclient.h"
+#include <X11/extensions/Xext.h>
+#include <X11/extensions/extutil.h>
+#include <X11/extensions/dri2proto.h>
+#include "glxextensions.h"
+#include "glcontextmodes.h"
+
+#ifdef USE_XCB
+#include <X11/Xlib-xcb.h>
+#include <xcb/xcb.h>
+#include <xcb/glx.h>
+#endif
+
+
+#ifdef DEBUG
+void __glXDumpDrawBuffer(__GLXcontext * ctx);
+#endif
+
+/*
+** You can set this cell to 1 to force the gl drawing stuff to be
+** one command per packet
+*/
+_X_HIDDEN int __glXDebug = 0;
+
+/* Extension required boiler plate */
+
+static char *__glXExtensionName = GLX_EXTENSION_NAME;
+XExtensionInfo *__glXExtensionInfo = NULL;
+
+static /* const */ char *error_list[] = {
+   "GLXBadContext",
+   "GLXBadContextState",
+   "GLXBadDrawable",
+   "GLXBadPixmap",
+   "GLXBadContextTag",
+   "GLXBadCurrentWindow",
+   "GLXBadRenderRequest",
+   "GLXBadLargeRequest",
+   "GLXUnsupportedPrivateRequest",
+   "GLXBadFBConfig",
+   "GLXBadPbuffer",
+   "GLXBadCurrentDrawable",
+   "GLXBadWindow",
+};
+
+static int
+__glXCloseDisplay(Display * dpy, XExtCodes * codes)
+{
+   GLXContext gc;
+
+   gc = __glXGetCurrentContext();
+   if (dpy == gc->currentDpy) {
+      __glXSetCurrentContextNull();
+      __glXFreeContext(gc);
+   }
+
+   return XextRemoveDisplay(__glXExtensionInfo, dpy);
+}
+
+
+static
+XEXT_GENERATE_ERROR_STRING(__glXErrorString, __glXExtensionName,
+                           __GLX_NUMBER_ERRORS, error_list)
+static Bool
+__glXWireToEvent(Display *dpy, XEvent *event, xEvent *wire);
+static Status
+__glXEventToWire(Display *dpy, XEvent *event, xEvent *wire);
+
+static /* const */ XExtensionHooks __glXExtensionHooks = {
+  NULL,                   /* create_gc */
+  NULL,                   /* copy_gc */
+  NULL,                   /* flush_gc */
+  NULL,                   /* free_gc */
+  NULL,                   /* create_font */
+  NULL,                   /* free_font */
+  __glXCloseDisplay,      /* close_display */
+  __glXWireToEvent,       /* wire_to_event */
+  __glXEventToWire,       /* event_to_wire */
+  NULL,                   /* error */
+  __glXErrorString,       /* error_string */
+};
+
+XEXT_GENERATE_FIND_DISPLAY(__glXFindDisplay, __glXExtensionInfo,
+                           __glXExtensionName, &__glXExtensionHooks,
+                           __GLX_NUMBER_EVENTS, NULL)
+
+/*
+ * GLX events are a bit funky.  We don't stuff the X event code into
+ * our user exposed (via XNextEvent) structure.  Instead we use the GLX
+ * private event code namespace (and hope it doesn't conflict).  Clients
+ * have to know that bit 15 in the event type field means they're getting
+ * a GLX event, and then handle the various sub-event types there, rather
+ * than simply checking the event code and handling it directly.
+ */
+
+static Bool
+__glXWireToEvent(Display *dpy, XEvent *event, xEvent *wire)
+{
+   XExtDisplayInfo *info = __glXFindDisplay(dpy);
+
+   XextCheckExtension(dpy, info, __glXExtensionName, False);
+
+   switch ((wire->u.u.type & 0x7f) - info->codes->first_event) {
+   case GLX_PbufferClobber:
+   {
+      GLXPbufferClobberEvent *aevent = (GLXPbufferClobberEvent *)event;
+      xGLXPbufferClobberEvent *awire = (xGLXPbufferClobberEvent *)wire;
+      aevent->event_type = awire->type;
+      aevent->serial = awire->sequenceNumber;
+      aevent->event_type = awire->event_type;
+      aevent->draw_type = awire->draw_type;
+      aevent->drawable = awire->drawable;
+      aevent->buffer_mask = awire->buffer_mask;
+      aevent->aux_buffer = awire->aux_buffer;
+      aevent->x = awire->x;
+      aevent->y = awire->y;
+      aevent->width = awire->width;
+      aevent->height = awire->height;
+      aevent->count = awire->count;
+      return True;
+   }
+   /* No easy symbol to test for this, as GLX_BufferSwapComplete is
+    * defined in the local glx.h header, but the
+    * xGLXBufferSwapComplete typedef is only available in new versions
+    * of the external glxproto.h header, which doesn't have any
+    * testable versioning define.
+    *
+    * I'll use the related DRI2 define, in the hope that we won't
+    * receive these events unless we know how to ask for them:
+    */
+#ifdef X_DRI2SwapBuffers
+   case GLX_BufferSwapComplete:
+   {
+      GLXBufferSwapComplete *aevent = (GLXBufferSwapComplete *)event;
+      xGLXBufferSwapComplete *awire = (xGLXBufferSwapComplete *)wire;
+      aevent->event_type = awire->event_type;
+      aevent->drawable = awire->drawable;
+      aevent->ust = ((CARD64)awire->ust_hi << 32) | awire->ust_lo;
+      aevent->msc = ((CARD64)awire->msc_hi << 32) | awire->msc_lo;
+      aevent->sbc = ((CARD64)awire->sbc_hi << 32) | awire->sbc_lo;
+      return True;
+   }
+#endif
+   default:
+      /* client doesn't support server event */
+      break;
+   }
+
+   return False;
+}
+
+/* We don't actually support this.  It doesn't make sense for clients to
+ * send each other GLX events.
+ */
+static Status
+__glXEventToWire(Display *dpy, XEvent *event, xEvent *wire)
+{
+   XExtDisplayInfo *info = __glXFindDisplay(dpy);
+
+   XextCheckExtension(dpy, info, __glXExtensionName, False);
+
+   switch (event->type) {
+   case GLX_DAMAGED:
+      break;
+   case GLX_SAVED:
+      break;
+   case GLX_EXCHANGE_COMPLETE_INTEL:
+      break;
+   case GLX_BLIT_COMPLETE_INTEL:
+      break;
+   case GLX_FLIP_COMPLETE_INTEL:
+      break;
+   default:
+      /* client doesn't support server event */
+      break;
+   }
+
+   return Success;
+}
+
+/************************************************************************/
+/*
+** Free the per screen configs data as well as the array of
+** __glXScreenConfigs.
+*/
+static void
+FreeScreenConfigs(__GLXdisplayPrivate * priv)
+{
+   __GLXscreenConfigs *psc;
+   GLint i, screens;
+
+   /* Free screen configuration information */
+   psc = priv->screenConfigs;
+   screens = ScreenCount(priv->dpy);
+   for (i = 0; i < screens; i++, psc++) {
+      if (psc->configs) {
+         _gl_context_modes_destroy(psc->configs);
+         if (psc->effectiveGLXexts)
+            Xfree(psc->effectiveGLXexts);
+         psc->configs = NULL;   /* NOTE: just for paranoia */
+      }
+      if (psc->visuals) {
+         _gl_context_modes_destroy(psc->visuals);
+         psc->visuals = NULL;   /* NOTE: just for paranoia */
+      }
+      Xfree((char *) psc->serverGLXexts);
+
+#ifdef GLX_DIRECT_RENDERING
+      if (psc->driver_configs) {
+         unsigned int j;
+         for (j = 0; psc->driver_configs[j]; j++)
+            free((__DRIconfig *) psc->driver_configs[j]);
+         free(psc->driver_configs);
+         psc->driver_configs = NULL;
+      }
+      if (psc->driScreen) {
+         psc->driScreen->destroyScreen(psc);
+         __glxHashDestroy(psc->drawHash);
+         XFree(psc->driScreen);
+         psc->driScreen = NULL;
+      }
+#endif
+   }
+   XFree((char *) priv->screenConfigs);
+   priv->screenConfigs = NULL;
+}
+
+/*
+** Release the private memory referred to in a display private
+** structure.  The caller will free the extension structure.
+*/
+static int
+__glXFreeDisplayPrivate(XExtData * extension)
+{
+   __GLXdisplayPrivate *priv;
+
+   priv = (__GLXdisplayPrivate *) extension->private_data;
+   FreeScreenConfigs(priv);
+   if (priv->serverGLXvendor) {
+      Xfree((char *) priv->serverGLXvendor);
+      priv->serverGLXvendor = 0x0;      /* to protect against double free's */
+   }
+   if (priv->serverGLXversion) {
+      Xfree((char *) priv->serverGLXversion);
+      priv->serverGLXversion = 0x0;     /* to protect against double free's */
+   }
+
+#ifdef GLX_DIRECT_RENDERING
+   /* Free the direct rendering per display data */
+   if (priv->driswDisplay)
+      (*priv->driswDisplay->destroyDisplay) (priv->driswDisplay);
+   priv->driswDisplay = NULL;
+
+   if (priv->driDisplay)
+      (*priv->driDisplay->destroyDisplay) (priv->driDisplay);
+   priv->driDisplay = NULL;
+
+   if (priv->dri2Display)
+      (*priv->dri2Display->destroyDisplay) (priv->dri2Display);
+   priv->dri2Display = NULL;
+#endif
+
+   Xfree((char *) priv);
+   return 0;
+}
+
+/************************************************************************/
+
+/*
+** Query the version of the GLX extension.  This procedure works even if
+** the client extension is not completely set up.
+*/
+static Bool
+QueryVersion(Display * dpy, int opcode, int *major, int *minor)
+{
+#ifdef USE_XCB
+   xcb_connection_t *c = XGetXCBConnection(dpy);
+   xcb_glx_query_version_reply_t *reply = xcb_glx_query_version_reply(c,
+                                                                      xcb_glx_query_version
+                                                                      (c,
+                                                                       GLX_MAJOR_VERSION,
+                                                                       GLX_MINOR_VERSION),
+                                                                      NULL);
+
+   if (reply->major_version != GLX_MAJOR_VERSION) {
+      free(reply);
+      return GL_FALSE;
+   }
+   *major = reply->major_version;
+   *minor = min(reply->minor_version, GLX_MINOR_VERSION);
+   free(reply);
+   return GL_TRUE;
+#else
+   xGLXQueryVersionReq *req;
+   xGLXQueryVersionReply reply;
+
+   /* Send the glXQueryVersion request */
+   LockDisplay(dpy);
+   GetReq(GLXQueryVersion, req);
+   req->reqType = opcode;
+   req->glxCode = X_GLXQueryVersion;
+   req->majorVersion = GLX_MAJOR_VERSION;
+   req->minorVersion = GLX_MINOR_VERSION;
+   _XReply(dpy, (xReply *) & reply, 0, False);
+   UnlockDisplay(dpy);
+   SyncHandle();
+
+   if (reply.majorVersion != GLX_MAJOR_VERSION) {
+      /*
+       ** The server does not support the same major release as this
+       ** client.
+       */
+      return GL_FALSE;
+   }
+   *major = reply.majorVersion;
+   *minor = min(reply.minorVersion, GLX_MINOR_VERSION);
+   return GL_TRUE;
+#endif /* USE_XCB */
+}
+
+
+_X_HIDDEN void
+__glXInitializeVisualConfigFromTags(__GLcontextModes * config, int count,
+                                    const INT32 * bp, Bool tagged_only,
+                                    Bool fbconfig_style_tags)
+{
+   int i;
+
+   if (!tagged_only) {
+      /* Copy in the first set of properties */
+      config->visualID = *bp++;
+
+      config->visualType = _gl_convert_from_x_visual_type(*bp++);
+
+      config->rgbMode = *bp++;
+
+      config->redBits = *bp++;
+      config->greenBits = *bp++;
+      config->blueBits = *bp++;
+      config->alphaBits = *bp++;
+      config->accumRedBits = *bp++;
+      config->accumGreenBits = *bp++;
+      config->accumBlueBits = *bp++;
+      config->accumAlphaBits = *bp++;
+
+      config->doubleBufferMode = *bp++;
+      config->stereoMode = *bp++;
+
+      config->rgbBits = *bp++;
+      config->depthBits = *bp++;
+      config->stencilBits = *bp++;
+      config->numAuxBuffers = *bp++;
+      config->level = *bp++;
+
+      count -= __GLX_MIN_CONFIG_PROPS;
+   }
+
+   /*
+    ** Additional properties may be in a list at the end
+    ** of the reply.  They are in pairs of property type
+    ** and property value.
+    */
+
+#define FETCH_OR_SET(tag) \
+    config-> tag = ( fbconfig_style_tags ) ? *bp++ : 1
+
+   for (i = 0; i < count; i += 2) {
+      switch (*bp++) {
+      case GLX_RGBA:
+         FETCH_OR_SET(rgbMode);
+         break;
+      case GLX_BUFFER_SIZE:
+         config->rgbBits = *bp++;
+         break;
+      case GLX_LEVEL:
+         config->level = *bp++;
+         break;
+      case GLX_DOUBLEBUFFER:
+         FETCH_OR_SET(doubleBufferMode);
+         break;
+      case GLX_STEREO:
+         FETCH_OR_SET(stereoMode);
+         break;
+      case GLX_AUX_BUFFERS:
+         config->numAuxBuffers = *bp++;
+         break;
+      case GLX_RED_SIZE:
+         config->redBits = *bp++;
+         break;
+      case GLX_GREEN_SIZE:
+         config->greenBits = *bp++;
+         break;
+      case GLX_BLUE_SIZE:
+         config->blueBits = *bp++;
+         break;
+      case GLX_ALPHA_SIZE:
+         config->alphaBits = *bp++;
+         break;
+      case GLX_DEPTH_SIZE:
+         config->depthBits = *bp++;
+         break;
+      case GLX_STENCIL_SIZE:
+         config->stencilBits = *bp++;
+         break;
+      case GLX_ACCUM_RED_SIZE:
+         config->accumRedBits = *bp++;
+         break;
+      case GLX_ACCUM_GREEN_SIZE:
+         config->accumGreenBits = *bp++;
+         break;
+      case GLX_ACCUM_BLUE_SIZE:
+         config->accumBlueBits = *bp++;
+         break;
+      case GLX_ACCUM_ALPHA_SIZE:
+         config->accumAlphaBits = *bp++;
+         break;
+      case GLX_VISUAL_CAVEAT_EXT:
+         config->visualRating = *bp++;
+         break;
+      case GLX_X_VISUAL_TYPE:
+         config->visualType = *bp++;
+         break;
+      case GLX_TRANSPARENT_TYPE:
+         config->transparentPixel = *bp++;
+         break;
+      case GLX_TRANSPARENT_INDEX_VALUE:
+         config->transparentIndex = *bp++;
+         break;
+      case GLX_TRANSPARENT_RED_VALUE:
+         config->transparentRed = *bp++;
+         break;
+      case GLX_TRANSPARENT_GREEN_VALUE:
+         config->transparentGreen = *bp++;
+         break;
+      case GLX_TRANSPARENT_BLUE_VALUE:
+         config->transparentBlue = *bp++;
+         break;
+      case GLX_TRANSPARENT_ALPHA_VALUE:
+         config->transparentAlpha = *bp++;
+         break;
+      case GLX_VISUAL_ID:
+         config->visualID = *bp++;
+         break;
+      case GLX_DRAWABLE_TYPE:
+         config->drawableType = *bp++;
+         break;
+      case GLX_RENDER_TYPE:
+         config->renderType = *bp++;
+         break;
+      case GLX_X_RENDERABLE:
+         config->xRenderable = *bp++;
+         break;
+      case GLX_FBCONFIG_ID:
+         config->fbconfigID = *bp++;
+         break;
+      case GLX_MAX_PBUFFER_WIDTH:
+         config->maxPbufferWidth = *bp++;
+         break;
+      case GLX_MAX_PBUFFER_HEIGHT:
+         config->maxPbufferHeight = *bp++;
+         break;
+      case GLX_MAX_PBUFFER_PIXELS:
+         config->maxPbufferPixels = *bp++;
+         break;
+      case GLX_OPTIMAL_PBUFFER_WIDTH_SGIX:
+         config->optimalPbufferWidth = *bp++;
+         break;
+      case GLX_OPTIMAL_PBUFFER_HEIGHT_SGIX:
+         config->optimalPbufferHeight = *bp++;
+         break;
+      case GLX_VISUAL_SELECT_GROUP_SGIX:
+         config->visualSelectGroup = *bp++;
+         break;
+      case GLX_SWAP_METHOD_OML:
+         config->swapMethod = *bp++;
+         break;
+      case GLX_SAMPLE_BUFFERS_SGIS:
+         config->sampleBuffers = *bp++;
+         break;
+      case GLX_SAMPLES_SGIS:
+         config->samples = *bp++;
+         break;
+      case GLX_BIND_TO_TEXTURE_RGB_EXT:
+         config->bindToTextureRgb = *bp++;
+         break;
+      case GLX_BIND_TO_TEXTURE_RGBA_EXT:
+         config->bindToTextureRgba = *bp++;
+         break;
+      case GLX_BIND_TO_MIPMAP_TEXTURE_EXT:
+         config->bindToMipmapTexture = *bp++;
+         break;
+      case GLX_BIND_TO_TEXTURE_TARGETS_EXT:
+         config->bindToTextureTargets = *bp++;
+         break;
+      case GLX_Y_INVERTED_EXT:
+         config->yInverted = *bp++;
+         break;
+      case None:
+         i = count;
+         break;
+      default:
+         break;
+      }
+   }
+
+   config->renderType =
+      (config->rgbMode) ? GLX_RGBA_BIT : GLX_COLOR_INDEX_BIT;
+
+   config->haveAccumBuffer = ((config->accumRedBits +
+                               config->accumGreenBits +
+                               config->accumBlueBits +
+                               config->accumAlphaBits) > 0);
+   config->haveDepthBuffer = (config->depthBits > 0);
+   config->haveStencilBuffer = (config->stencilBits > 0);
+}
+
+static __GLcontextModes *
+createConfigsFromProperties(Display * dpy, int nvisuals, int nprops,
+                            int screen, GLboolean tagged_only)
+{
+   INT32 buf[__GLX_TOTAL_CONFIG], *props;
+   unsigned prop_size;
+   __GLcontextModes *modes, *m;
+   int i;
+
+   if (nprops == 0)
+      return NULL;
+
+   /* FIXME: Is the __GLX_MIN_CONFIG_PROPS test correct for FBconfigs? */
+
+   /* Check number of properties */
+   if (nprops < __GLX_MIN_CONFIG_PROPS || nprops > __GLX_MAX_CONFIG_PROPS)
+      return NULL;
+
+   /* Allocate memory for our config structure */
+   modes = _gl_context_modes_create(nvisuals, sizeof(__GLcontextModes));
+   if (!modes)
+      return NULL;
+
+   prop_size = nprops * __GLX_SIZE_INT32;
+   if (prop_size <= sizeof(buf))
+      props = buf;
+   else
+      props = Xmalloc(prop_size);
+
+   /* Read each config structure and convert it into our format */
+   m = modes;
+   for (i = 0; i < nvisuals; i++) {
+      _XRead(dpy, (char *) props, prop_size);
+      /* Older X servers don't send this so we default it here. */
+      m->drawableType = GLX_WINDOW_BIT;
+      __glXInitializeVisualConfigFromTags(m, nprops, props,
+                                          tagged_only, GL_TRUE);
+      m->screen = screen;
+      m = m->next;
+   }
+
+   if (props != buf)
+      Xfree(props);
+
+   return modes;
+}
+
+static GLboolean
+getVisualConfigs(Display * dpy, __GLXdisplayPrivate * priv, int screen)
+{
+   xGLXGetVisualConfigsReq *req;
+   __GLXscreenConfigs *psc;
+   xGLXGetVisualConfigsReply reply;
+
+   LockDisplay(dpy);
+
+   psc = priv->screenConfigs + screen;
+   psc->visuals = NULL;
+   GetReq(GLXGetVisualConfigs, req);
+   req->reqType = priv->majorOpcode;
+   req->glxCode = X_GLXGetVisualConfigs;
+   req->screen = screen;
+
+   if (!_XReply(dpy, (xReply *) & reply, 0, False))
+      goto out;
+
+   psc->visuals = createConfigsFromProperties(dpy,
+                                              reply.numVisuals,
+                                              reply.numProps,
+                                              screen, GL_FALSE);
+
+ out:
+   UnlockDisplay(dpy);
+   return psc->visuals != NULL;
+}
+
+static GLboolean
+getFBConfigs(Display * dpy, __GLXdisplayPrivate * priv, int screen)
+{
+   xGLXGetFBConfigsReq *fb_req;
+   xGLXGetFBConfigsSGIXReq *sgi_req;
+   xGLXVendorPrivateWithReplyReq *vpreq;
+   xGLXGetFBConfigsReply reply;
+   __GLXscreenConfigs *psc;
+
+   psc = priv->screenConfigs + screen;
+   psc->serverGLXexts =
+      __glXQueryServerString(dpy, priv->majorOpcode, screen, GLX_EXTENSIONS);
+
+   LockDisplay(dpy);
+
+   psc->configs = NULL;
+   if (atof(priv->serverGLXversion) >= 1.3) {
+      GetReq(GLXGetFBConfigs, fb_req);
+      fb_req->reqType = priv->majorOpcode;
+      fb_req->glxCode = X_GLXGetFBConfigs;
+      fb_req->screen = screen;
+   }
+   else if (strstr(psc->serverGLXexts, "GLX_SGIX_fbconfig") != NULL) {
+      GetReqExtra(GLXVendorPrivateWithReply,
+                  sz_xGLXGetFBConfigsSGIXReq +
+                  sz_xGLXVendorPrivateWithReplyReq, vpreq);
+      sgi_req = (xGLXGetFBConfigsSGIXReq *) vpreq;
+      sgi_req->reqType = priv->majorOpcode;
+      sgi_req->glxCode = X_GLXVendorPrivateWithReply;
+      sgi_req->vendorCode = X_GLXvop_GetFBConfigsSGIX;
+      sgi_req->screen = screen;
+   }
+   else
+      goto out;
+
+   if (!_XReply(dpy, (xReply *) & reply, 0, False))
+      goto out;
+
+   psc->configs = createConfigsFromProperties(dpy,
+                                              reply.numFBConfigs,
+                                              reply.numAttribs * 2,
+                                              screen, GL_TRUE);
+
+ out:
+   UnlockDisplay(dpy);
+   return psc->configs != NULL;
+}
+
+/*
+** Allocate the memory for the per screen configs for each screen.
+** If that works then fetch the per screen configs data.
+*/
+static Bool
+AllocAndFetchScreenConfigs(Display * dpy, __GLXdisplayPrivate * priv)
+{
+   __GLXscreenConfigs *psc;
+   GLint i, screens;
+
+   /*
+    ** First allocate memory for the array of per screen configs.
+    */
+   screens = ScreenCount(dpy);
+   psc = (__GLXscreenConfigs *) Xmalloc(screens * sizeof(__GLXscreenConfigs));
+   if (!psc) {
+      return GL_FALSE;
+   }
+   memset(psc, 0, screens * sizeof(__GLXscreenConfigs));
+   priv->screenConfigs = psc;
+
+   priv->serverGLXversion =
+      __glXQueryServerString(dpy, priv->majorOpcode, 0, GLX_VERSION);
+   if (priv->serverGLXversion == NULL) {
+      FreeScreenConfigs(priv);
+      return GL_FALSE;
+   }
+
+   for (i = 0; i < screens; i++, psc++) {
+      getVisualConfigs(dpy, priv, i);
+      getFBConfigs(dpy, priv, i);
+
+#ifdef GLX_DIRECT_RENDERING
+      psc->scr = i;
+      psc->dpy = dpy;
+      psc->drawHash = __glxHashCreate();
+      if (psc->drawHash == NULL)
+         continue;
+
+      if (priv->dri2Display)
+         psc->driScreen = (*priv->dri2Display->createScreen) (psc, i, priv);
+
+      if (psc->driScreen == NULL && priv->driDisplay)
+         psc->driScreen = (*priv->driDisplay->createScreen) (psc, i, priv);
+
+      if (psc->driScreen == NULL && priv->driswDisplay)
+         psc->driScreen = (*priv->driswDisplay->createScreen) (psc, i, priv);
+
+      if (psc->driScreen == NULL) {
+         __glxHashDestroy(psc->drawHash);
+         psc->drawHash = NULL;
+      }
+#endif
+   }
+   SyncHandle();
+   return GL_TRUE;
+}
+
+/*
+** Initialize the client side extension code.
+*/
+_X_HIDDEN __GLXdisplayPrivate *
+__glXInitialize(Display * dpy)
+{
+   XExtDisplayInfo *info = __glXFindDisplay(dpy);
+   XExtData **privList, *private, *found;
+   __GLXdisplayPrivate *dpyPriv;
+   XEDataObject dataObj;
+   int major, minor;
+#ifdef GLX_DIRECT_RENDERING
+   Bool glx_direct, glx_accel;
+#endif
+
+   /* The one and only long long lock */
+   __glXLock();
+
+   if (!XextHasExtension(info)) {
+      /* No GLX extension supported by this server. Oh well. */
+      __glXUnlock();
+      XMissingExtension(dpy, __glXExtensionName);
+      return 0;
+   }
+
+   /* See if a display private already exists.  If so, return it */
+   dataObj.display = dpy;
+   privList = XEHeadOfExtensionList(dataObj);
+   found = XFindOnExtensionList(privList, info->codes->extension);
+   if (found) {
+      __glXUnlock();
+      return (__GLXdisplayPrivate *) found->private_data;
+   }
+
+   /* See if the versions are compatible */
+   if (!QueryVersion(dpy, info->codes->major_opcode, &major, &minor)) {
+      /* The client and server do not agree on versions.  Punt. */
+      __glXUnlock();
+      return 0;
+   }
+
+   /*
+    ** Allocate memory for all the pieces needed for this buffer.
+    */
+   private = (XExtData *) Xmalloc(sizeof(XExtData));
+   if (!private) {
+      __glXUnlock();
+      return 0;
+   }
+   dpyPriv = (__GLXdisplayPrivate *) Xcalloc(1, sizeof(__GLXdisplayPrivate));
+   if (!dpyPriv) {
+      __glXUnlock();
+      Xfree((char *) private);
+      return 0;
+   }
+
+   /*
+    ** Init the display private and then read in the screen config
+    ** structures from the server.
+    */
+   dpyPriv->majorOpcode = info->codes->major_opcode;
+   dpyPriv->majorVersion = major;
+   dpyPriv->minorVersion = minor;
+   dpyPriv->dpy = dpy;
+
+   dpyPriv->serverGLXvendor = 0x0;
+   dpyPriv->serverGLXversion = 0x0;
+
+#ifdef GLX_DIRECT_RENDERING
+   glx_direct = (getenv("LIBGL_ALWAYS_INDIRECT") == NULL);
+   glx_accel = (getenv("LIBGL_ALWAYS_SOFTWARE") == NULL);
+
+   /*
+    ** Initialize the direct rendering per display data and functions.
+    ** Note: This _must_ be done before calling any other DRI routines
+    ** (e.g., those called in AllocAndFetchScreenConfigs).
+    */
+   if (glx_direct && glx_accel) {
+      dpyPriv->dri2Display = dri2CreateDisplay(dpy);
+      dpyPriv->driDisplay = driCreateDisplay(dpy);
+   }
+   if (glx_direct)
+      dpyPriv->driswDisplay = driswCreateDisplay(dpy);
+#endif
+
+   if (!AllocAndFetchScreenConfigs(dpy, dpyPriv)) {
+      __glXUnlock();
+      Xfree((char *) dpyPriv);
+      Xfree((char *) private);
+      return 0;
+   }
+
+   /*
+    ** Fill in the private structure.  This is the actual structure that
+    ** hangs off of the Display structure.  Our private structure is
+    ** referred to by this structure.  Got that?
+    */
+   private->number = info->codes->extension;
+   private->next = 0;
+   private->free_private = __glXFreeDisplayPrivate;
+   private->private_data = (char *) dpyPriv;
+   XAddToExtensionList(privList, private);
+
+   if (dpyPriv->majorVersion == 1 && dpyPriv->minorVersion >= 1) {
+      __glXClientInfo(dpy, dpyPriv->majorOpcode);
+   }
+   __glXUnlock();
+
+   return dpyPriv;
+}
+
+/*
+** Setup for sending a GLX command on dpy.  Make sure the extension is
+** initialized.  Try to avoid calling __glXInitialize as its kinda slow.
+*/
+_X_HIDDEN CARD8
+__glXSetupForCommand(Display * dpy)
+{
+   GLXContext gc;
+   __GLXdisplayPrivate *priv;
+
+   /* If this thread has a current context, flush its rendering commands */
+   gc = __glXGetCurrentContext();
+   if (gc->currentDpy) {
+      /* Flush rendering buffer of the current context, if any */
+      (void) __glXFlushRenderBuffer(gc, gc->pc);
+
+      if (gc->currentDpy == dpy) {
+         /* Use opcode from gc because its right */
+         return gc->majorOpcode;
+      }
+      else {
+         /*
+          ** Have to get info about argument dpy because it might be to
+          ** a different server
+          */
+      }
+   }
+
+   /* Forced to lookup extension via the slow initialize route */
+   priv = __glXInitialize(dpy);
+   if (!priv) {
+      return 0;
+   }
+   return priv->majorOpcode;
+}
+
+/**
+ * Flush the drawing command transport buffer.
+ *
+ * \param ctx  Context whose transport buffer is to be flushed.
+ * \param pc   Pointer to first unused buffer location.
+ *
+ * \todo
+ * Modify this function to use \c ctx->pc instead of the explicit
+ * \c pc parameter.
+ */
+_X_HIDDEN GLubyte *
+__glXFlushRenderBuffer(__GLXcontext * ctx, GLubyte * pc)
+{
+   Display *const dpy = ctx->currentDpy;
+#ifdef USE_XCB
+   xcb_connection_t *c = XGetXCBConnection(dpy);
+#else
+   xGLXRenderReq *req;
+#endif /* USE_XCB */
+   const GLint size = pc - ctx->buf;
+
+   if ((dpy != NULL) && (size > 0)) {
+#ifdef USE_XCB
+      xcb_glx_render(c, ctx->currentContextTag, size,
+                     (const uint8_t *) ctx->buf);
+#else
+      /* Send the entire buffer as an X request */
+      LockDisplay(dpy);
+      GetReq(GLXRender, req);
+      req->reqType = ctx->majorOpcode;
+      req->glxCode = X_GLXRender;
+      req->contextTag = ctx->currentContextTag;
+      req->length += (size + 3) >> 2;
+      _XSend(dpy, (char *) ctx->buf, size);
+      UnlockDisplay(dpy);
+      SyncHandle();
+#endif
+   }
+
+   /* Reset pointer and return it */
+   ctx->pc = ctx->buf;
+   return ctx->pc;
+}
+
+
+/**
+ * Send a portion of a GLXRenderLarge command to the server.  The advantage of
+ * this function over \c __glXSendLargeCommand is that callers can use the
+ * data buffer in the GLX context and may be able to avoid allocating an
+ * extra buffer.  The disadvantage is the clients will have to do more
+ * GLX protocol work (i.e., calculating \c totalRequests, etc.).
+ *
+ * \sa __glXSendLargeCommand
+ *
+ * \param gc             GLX context
+ * \param requestNumber  Which part of the whole command is this?  The first
+ *                       request is 1.
+ * \param totalRequests  How many requests will there be?
+ * \param data           Command data.
+ * \param dataLen        Size, in bytes, of the command data.
+ */
+_X_HIDDEN void
+__glXSendLargeChunk(__GLXcontext * gc, GLint requestNumber,
+                    GLint totalRequests, const GLvoid * data, GLint dataLen)
+{
+   Display *dpy = gc->currentDpy;
+#ifdef USE_XCB
+   xcb_connection_t *c = XGetXCBConnection(dpy);
+   xcb_glx_render_large(c, gc->currentContextTag, requestNumber,
+                        totalRequests, dataLen, data);
+#else
+   xGLXRenderLargeReq *req;
+
+   if (requestNumber == 1) {
+      LockDisplay(dpy);
+   }
+
+   GetReq(GLXRenderLarge, req);
+   req->reqType = gc->majorOpcode;
+   req->glxCode = X_GLXRenderLarge;
+   req->contextTag = gc->currentContextTag;
+   req->length += (dataLen + 3) >> 2;
+   req->requestNumber = requestNumber;
+   req->requestTotal = totalRequests;
+   req->dataBytes = dataLen;
+   Data(dpy, data, dataLen);
+
+   if (requestNumber == totalRequests) {
+      UnlockDisplay(dpy);
+      SyncHandle();
+   }
+#endif /* USE_XCB */
+}
+
+
+/**
+ * Send a command that is too large for the GLXRender protocol request.
+ *
+ * Send a large command, one that is too large for some reason to
+ * send using the GLXRender protocol request.  One reason to send
+ * a large command is to avoid copying the data.
+ *
+ * \param ctx        GLX context
+ * \param header     Header data.
+ * \param headerLen  Size, in bytes, of the header data.  It is assumed that
+ *                   the header data will always be small enough to fit in
+ *                   a single X protocol packet.
+ * \param data       Command data.
+ * \param dataLen    Size, in bytes, of the command data.
+ */
+_X_HIDDEN void
+__glXSendLargeCommand(__GLXcontext * ctx,
+                      const GLvoid * header, GLint headerLen,
+                      const GLvoid * data, GLint dataLen)
+{
+   GLint maxSize;
+   GLint totalRequests, requestNumber;
+
+   /*
+    ** Calculate the maximum amount of data can be stuffed into a single
+    ** packet.  sz_xGLXRenderReq is added because bufSize is the maximum
+    ** packet size minus sz_xGLXRenderReq.
+    */
+   maxSize = (ctx->bufSize + sz_xGLXRenderReq) - sz_xGLXRenderLargeReq;
+   totalRequests = 1 + (dataLen / maxSize);
+   if (dataLen % maxSize)
+      totalRequests++;
+
+   /*
+    ** Send all of the command, except the large array, as one request.
+    */
+   assert(headerLen <= maxSize);
+   __glXSendLargeChunk(ctx, 1, totalRequests, header, headerLen);
+
+   /*
+    ** Send enough requests until the whole array is sent.
+    */
+   for (requestNumber = 2; requestNumber <= (totalRequests - 1);
+        requestNumber++) {
+      __glXSendLargeChunk(ctx, requestNumber, totalRequests, data, maxSize);
+      data = (const GLvoid *) (((const GLubyte *) data) + maxSize);
+      dataLen -= maxSize;
+      assert(dataLen > 0);
+   }
+
+   assert(dataLen <= maxSize);
+   __glXSendLargeChunk(ctx, requestNumber, totalRequests, data, dataLen);
+}
+
+/************************************************************************/
+
+#ifdef DEBUG
+_X_HIDDEN void
+__glXDumpDrawBuffer(__GLXcontext * ctx)
+{
+   GLubyte *p = ctx->buf;
+   GLubyte *end = ctx->pc;
+   GLushort opcode, length;
+
+   while (p < end) {
+      /* Fetch opcode */
+      opcode = *((GLushort *) p);
+      length = *((GLushort *) (p + 2));
+      printf("%2x: %5d: ", opcode, length);
+      length -= 4;
+      p += 4;
+      while (length > 0) {
+         printf("%08x ", *((unsigned *) p));
+         p += 4;
+         length -= 4;
+      }
+      printf("\n");
+   }
+}
+#endif