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

Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
Copyright 2000 VA Linux Systems, 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, 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 <martin@valinux.com>
 *   Jens Owen <jowen@vmware.com>
 *   Rickard E. (Rik) Faith <faith@valinux.com>
 *
 */

/* THIS IS NOT AN X CONSORTIUM STANDARD */

#if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL)

#include <X11/Xlibint.h>
#include <X11/Xfuncproto.h>
#include <X11/extensions/Xext.h>
#include <X11/extensions/extutil.h>
#include "xf86dristr.h"
#include <limits.h>

static XExtensionInfo _xf86dri_info_data;
static XExtensionInfo *xf86dri_info = &_xf86dri_info_data;
static char xf86dri_extension_name[] = XF86DRINAME;

#define XF86DRICheckExtension(dpy,i,val) \
  XextCheckExtension (dpy, i, xf86dri_extension_name, val)

/*****************************************************************************
 *                                                                           *
 *			   private utility routines                          *
 *                                                                           *
 *****************************************************************************/

static int close_display(Display * dpy, XExtCodes * extCodes);
static /* const */ XExtensionHooks xf86dri_extension_hooks = {
   NULL,                        /* create_gc */
   NULL,                        /* copy_gc */
   NULL,                        /* flush_gc */
   NULL,                        /* free_gc */
   NULL,                        /* create_font */
   NULL,                        /* free_font */
   close_display,               /* close_display */
   NULL,                        /* wire_to_event */
   NULL,                        /* event_to_wire */
   NULL,                        /* error */
   NULL,                        /* error_string */
};

static
XEXT_GENERATE_FIND_DISPLAY(find_display, xf86dri_info,
                           xf86dri_extension_name,
                           &xf86dri_extension_hooks, 0, NULL)

static
XEXT_GENERATE_CLOSE_DISPLAY(close_display, xf86dri_info)


/*****************************************************************************
 *                                                                           *
 *		    public XFree86-DRI Extension routines                    *
 *                                                                           *
 *****************************************************************************/
#if 0
#include <stdio.h>
#define TRACE(msg)  fprintf(stderr,"XF86DRI%s\n", msg);
#else
#define TRACE(msg)
#endif

Bool
XF86DRIQueryExtension(Display * dpy, int *event_basep,
                      int *error_basep)
{
   XExtDisplayInfo *info = find_display(dpy);

   TRACE("QueryExtension...");
   if (XextHasExtension(info)) {
      *event_basep = info->codes->first_event;
      *error_basep = info->codes->first_error;
      TRACE("QueryExtension... return True");
      return True;
   }
   else {
      TRACE("QueryExtension... return False");
      return False;
   }
}

Bool
XF86DRIQueryVersion(Display * dpy, int *majorVersion, int *minorVersion,
                    int *patchVersion)
{
   XExtDisplayInfo *info = find_display(dpy);
   xXF86DRIQueryVersionReply rep;
   xXF86DRIQueryVersionReq *req;

   TRACE("QueryVersion...");
   XF86DRICheckExtension(dpy, info, False);

   LockDisplay(dpy);
   GetReq(XF86DRIQueryVersion, req);
   req->reqType = info->codes->major_opcode;
   req->driReqType = X_XF86DRIQueryVersion;
   if (!_XReply(dpy, (xReply *) & rep, 0, xFalse)) {
      UnlockDisplay(dpy);
      SyncHandle();
      TRACE("QueryVersion... return False");
      return False;
   }
   *majorVersion = rep.majorVersion;
   *minorVersion = rep.minorVersion;
   *patchVersion = rep.patchVersion;
   UnlockDisplay(dpy);
   SyncHandle();
   TRACE("QueryVersion... return True");
   return True;
}

Bool
XF86DRIQueryDirectRenderingCapable(Display * dpy, int screen,
                                   Bool * isCapable)
{
   XExtDisplayInfo *info = find_display(dpy);
   xXF86DRIQueryDirectRenderingCapableReply rep;
   xXF86DRIQueryDirectRenderingCapableReq *req;

   TRACE("QueryDirectRenderingCapable...");
   XF86DRICheckExtension(dpy, info, False);

   LockDisplay(dpy);
   GetReq(XF86DRIQueryDirectRenderingCapable, req);
   req->reqType = info->codes->major_opcode;
   req->driReqType = X_XF86DRIQueryDirectRenderingCapable;
   req->screen = screen;
   if (!_XReply(dpy, (xReply *) & rep, 0, xFalse)) {
      UnlockDisplay(dpy);
      SyncHandle();
      TRACE("QueryDirectRenderingCapable... return False");
      return False;
   }
   *isCapable = rep.isCapable;
   UnlockDisplay(dpy);
   SyncHandle();
   TRACE("QueryDirectRenderingCapable... return True");
   return True;
}

Bool
XF86DRIOpenConnection(Display * dpy, int screen, drm_handle_t * hSAREA,
                      char **busIdString)
{
   XExtDisplayInfo *info = find_display(dpy);
   xXF86DRIOpenConnectionReply rep;
   xXF86DRIOpenConnectionReq *req;

   TRACE("OpenConnection...");
   XF86DRICheckExtension(dpy, info, False);

   LockDisplay(dpy);
   GetReq(XF86DRIOpenConnection, req);
   req->reqType = info->codes->major_opcode;
   req->driReqType = X_XF86DRIOpenConnection;
   req->screen = screen;
   if (!_XReply(dpy, (xReply *) & rep, 0, xFalse)) {
      UnlockDisplay(dpy);
      SyncHandle();
      TRACE("OpenConnection... return False");
      return False;
   }

   *hSAREA = rep.hSAREALow;
   if (sizeof(drm_handle_t) == 8) {
      int shift = 32;           /* var to prevent warning on next line */
      *hSAREA |= ((drm_handle_t) rep.hSAREAHigh) << shift;
   }

   if (rep.length) {
      if (rep.busIdStringLength < INT_MAX)
         *busIdString = calloc(rep.busIdStringLength + 1, 1);
      else
         *busIdString = NULL;
      if (*busIdString == NULL) {
         _XEatData(dpy, ((rep.busIdStringLength + 3) & ~3));
         UnlockDisplay(dpy);
         SyncHandle();
         TRACE("OpenConnection... return False");
         return False;
      }
      _XReadPad(dpy, *busIdString, rep.busIdStringLength);
   }
   else {
      *busIdString = NULL;
   }
   UnlockDisplay(dpy);
   SyncHandle();
   TRACE("OpenConnection... return True");
   return True;
}

Bool
XF86DRIAuthConnection(Display * dpy, int screen, drm_magic_t magic)
{
   XExtDisplayInfo *info = find_display(dpy);
   xXF86DRIAuthConnectionReq *req;
   xXF86DRIAuthConnectionReply rep;

   TRACE("AuthConnection...");
   XF86DRICheckExtension(dpy, info, False);

   LockDisplay(dpy);
   GetReq(XF86DRIAuthConnection, req);
   req->reqType = info->codes->major_opcode;
   req->driReqType = X_XF86DRIAuthConnection;
   req->screen = screen;
   req->magic = magic;
   rep.authenticated = 0;
   if (!_XReply(dpy, (xReply *) & rep, 0, xFalse) || !rep.authenticated) {
      UnlockDisplay(dpy);
      SyncHandle();
      TRACE("AuthConnection... return False");
      return False;
   }
   UnlockDisplay(dpy);
   SyncHandle();
   TRACE("AuthConnection... return True");
   return True;
}

Bool
XF86DRICloseConnection(Display * dpy, int screen)
{
   XExtDisplayInfo *info = find_display(dpy);
   xXF86DRICloseConnectionReq *req;

   TRACE("CloseConnection...");

   XF86DRICheckExtension(dpy, info, False);

   LockDisplay(dpy);
   GetReq(XF86DRICloseConnection, req);
   req->reqType = info->codes->major_opcode;
   req->driReqType = X_XF86DRICloseConnection;
   req->screen = screen;
   UnlockDisplay(dpy);
   SyncHandle();
   TRACE("CloseConnection... return True");
   return True;
}

Bool
XF86DRIGetClientDriverName(Display * dpy, int screen,
                           int *ddxDriverMajorVersion,
                           int *ddxDriverMinorVersion,
                           int *ddxDriverPatchVersion,
                           char **clientDriverName)
{
   XExtDisplayInfo *info = find_display(dpy);
   xXF86DRIGetClientDriverNameReply rep;
   xXF86DRIGetClientDriverNameReq *req;

   TRACE("GetClientDriverName...");
   XF86DRICheckExtension(dpy, info, False);

   LockDisplay(dpy);
   GetReq(XF86DRIGetClientDriverName, req);
   req->reqType = info->codes->major_opcode;
   req->driReqType = X_XF86DRIGetClientDriverName;
   req->screen = screen;
   if (!_XReply(dpy, (xReply *) & rep, 0, xFalse)) {
      UnlockDisplay(dpy);
      SyncHandle();
      TRACE("GetClientDriverName... return False");
      return False;
   }

   *ddxDriverMajorVersion = rep.ddxDriverMajorVersion;
   *ddxDriverMinorVersion = rep.ddxDriverMinorVersion;
   *ddxDriverPatchVersion = rep.ddxDriverPatchVersion;

   if (rep.length) {
      if (rep.clientDriverNameLength < INT_MAX)
         *clientDriverName = calloc(rep.clientDriverNameLength + 1, 1);
      else
         *clientDriverName = NULL;
      if (*clientDriverName == NULL) {
         _XEatData(dpy, ((rep.clientDriverNameLength + 3) & ~3));
         UnlockDisplay(dpy);
         SyncHandle();
         TRACE("GetClientDriverName... return False");
         return False;
      }
      _XReadPad(dpy, *clientDriverName, rep.clientDriverNameLength);
   }
   else {
      *clientDriverName = NULL;
   }
   UnlockDisplay(dpy);
   SyncHandle();
   TRACE("GetClientDriverName... return True");
   return True;
}

Bool
XF86DRICreateContextWithConfig(Display * dpy, int screen, int configID,
                               XID * context, drm_context_t * hHWContext)
{
   XExtDisplayInfo *info = find_display(dpy);
   xXF86DRICreateContextReply rep;
   xXF86DRICreateContextReq *req;

   TRACE("CreateContext...");
   XF86DRICheckExtension(dpy, info, False);

   LockDisplay(dpy);
   GetReq(XF86DRICreateContext, req);
   req->reqType = info->codes->major_opcode;
   req->driReqType = X_XF86DRICreateContext;
   req->visual = configID;
   req->screen = screen;
   *context = XAllocID(dpy);
   req->context = *context;
   if (!_XReply(dpy, (xReply *) & rep, 0, xFalse)) {
      UnlockDisplay(dpy);
      SyncHandle();
      TRACE("CreateContext... return False");
      return False;
   }
   *hHWContext = rep.hHWContext;
   UnlockDisplay(dpy);
   SyncHandle();
   TRACE("CreateContext... return True");
   return True;
}

Bool
XF86DRICreateContext(Display * dpy, int screen, Visual * visual,
                     XID * context, drm_context_t * hHWContext)
{
   return XF86DRICreateContextWithConfig(dpy, screen, visual->visualid,
                                         context, hHWContext);
}

Bool
XF86DRIDestroyContext(Display * dpy, int screen, XID context)
{
   XExtDisplayInfo *info = find_display(dpy);
   xXF86DRIDestroyContextReq *req;

   TRACE("DestroyContext...");
   XF86DRICheckExtension(dpy, info, False);

   LockDisplay(dpy);
   GetReq(XF86DRIDestroyContext, req);
   req->reqType = info->codes->major_opcode;
   req->driReqType = X_XF86DRIDestroyContext;
   req->screen = screen;
   req->context = context;
   UnlockDisplay(dpy);
   SyncHandle();
   TRACE("DestroyContext... return True");
   return True;
}

Bool
XF86DRICreateDrawable(Display * dpy, int screen,
                      XID drawable, drm_drawable_t * hHWDrawable)
{
   XExtDisplayInfo *info = find_display(dpy);
   xXF86DRICreateDrawableReply rep;
   xXF86DRICreateDrawableReq *req;

   TRACE("CreateDrawable...");
   XF86DRICheckExtension(dpy, info, False);

   LockDisplay(dpy);
   GetReq(XF86DRICreateDrawable, req);
   req->reqType = info->codes->major_opcode;
   req->driReqType = X_XF86DRICreateDrawable;
   req->screen = screen;
   req->drawable = drawable;
   if (!_XReply(dpy, (xReply *) & rep, 0, xFalse)) {
      UnlockDisplay(dpy);
      SyncHandle();
      TRACE("CreateDrawable... return False");
      return False;
   }
   *hHWDrawable = rep.hHWDrawable;
   UnlockDisplay(dpy);
   SyncHandle();
   TRACE("CreateDrawable... return True");
   return True;
}

static int
noopErrorHandler(Display * dpy, XErrorEvent * xerr)
{
   return 0;
}

Bool
XF86DRIDestroyDrawable(Display * dpy, int screen, XID drawable)
{
   XExtDisplayInfo *info = find_display(dpy);
   xXF86DRIDestroyDrawableReq *req;
   int (*oldXErrorHandler) (Display *, XErrorEvent *);

   TRACE("DestroyDrawable...");
   XF86DRICheckExtension(dpy, info, False);

   /* This is called from the DRI driver, which used call it like this
    *
    *   if (windowExists(drawable))
    *     destroyDrawable(drawable);
    *
    * which is a textbook race condition - the window may disappear
    * from the server between checking for its existence and
    * destroying it.  Instead we change the semantics of
    * __DRIinterfaceMethodsRec::destroyDrawable() to succeed even if
    * the windows is gone, by wrapping the destroy call in an error
    * handler. */

   XSync(dpy, False);
   oldXErrorHandler = XSetErrorHandler(noopErrorHandler);

   LockDisplay(dpy);
   GetReq(XF86DRIDestroyDrawable, req);
   req->reqType = info->codes->major_opcode;
   req->driReqType = X_XF86DRIDestroyDrawable;
   req->screen = screen;
   req->drawable = drawable;
   UnlockDisplay(dpy);
   SyncHandle();

   XSetErrorHandler(oldXErrorHandler);

   TRACE("DestroyDrawable... return True");
   return True;
}

Bool
XF86DRIGetDrawableInfo(Display * dpy, int screen, Drawable 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)
{
   XExtDisplayInfo *info = find_display(dpy);
   xXF86DRIGetDrawableInfoReply rep;
   xXF86DRIGetDrawableInfoReq *req;
   int total_rects;

   TRACE("GetDrawableInfo...");
   XF86DRICheckExtension(dpy, info, False);

   LockDisplay(dpy);
   GetReq(XF86DRIGetDrawableInfo, req);
   req->reqType = info->codes->major_opcode;
   req->driReqType = X_XF86DRIGetDrawableInfo;
   req->screen = screen;
   req->drawable = drawable;

   if (!_XReply(dpy, (xReply *) & rep, 1, xFalse)) {
      UnlockDisplay(dpy);
      SyncHandle();
      TRACE("GetDrawableInfo... return False");
      return False;
   }
   *index = rep.drawableTableIndex;
   *stamp = rep.drawableTableStamp;
   *X = (int) rep.drawableX;
   *Y = (int) rep.drawableY;
   *W = (int) rep.drawableWidth;
   *H = (int) rep.drawableHeight;
   *numClipRects = rep.numClipRects;
   total_rects = *numClipRects;

   *backX = rep.backX;
   *backY = rep.backY;
   *numBackClipRects = rep.numBackClipRects;
   total_rects += *numBackClipRects;

#if 0
   /* Because of the fix in Xserver/GL/dri/xf86dri.c, this check breaks
    * backwards compatibility (Because of the >> 2 shift) but the fix
    * enables multi-threaded apps to work.
    */
   if (rep.length != ((((SIZEOF(xXF86DRIGetDrawableInfoReply) -
                         SIZEOF(xGenericReply) +
                         total_rects * sizeof(drm_clip_rect_t)) +
                        3) & ~3) >> 2)) {
      _XEatData(dpy, rep.length);
      UnlockDisplay(dpy);
      SyncHandle();
      TRACE("GetDrawableInfo... return False");
      return False;
   }
#endif

   if (*numClipRects) {
      int len = sizeof(drm_clip_rect_t) * (*numClipRects);

      *pClipRects = calloc(len, 1);
      if (*pClipRects)
         _XRead(dpy, (char *) *pClipRects, len);
   }
   else {
      *pClipRects = NULL;
   }

   if (*numBackClipRects) {
      int len = sizeof(drm_clip_rect_t) * (*numBackClipRects);

      *pBackClipRects = calloc(len, 1);
      if (*pBackClipRects)
         _XRead(dpy, (char *) *pBackClipRects, len);
   }
   else {
      *pBackClipRects = NULL;
   }

   UnlockDisplay(dpy);
   SyncHandle();
   TRACE("GetDrawableInfo... return True");
   return True;
}

Bool
XF86DRIGetDeviceInfo(Display * dpy, int screen, drm_handle_t * hFrameBuffer,
                     int *fbOrigin, int *fbSize, int *fbStride,
                     int *devPrivateSize, void **pDevPrivate)
{
   XExtDisplayInfo *info = find_display(dpy);
   xXF86DRIGetDeviceInfoReply rep;
   xXF86DRIGetDeviceInfoReq *req;

   TRACE("GetDeviceInfo...");
   XF86DRICheckExtension(dpy, info, False);

   LockDisplay(dpy);
   GetReq(XF86DRIGetDeviceInfo, req);
   req->reqType = info->codes->major_opcode;
   req->driReqType = X_XF86DRIGetDeviceInfo;
   req->screen = screen;
   if (!_XReply(dpy, (xReply *) & rep, 0, xFalse)) {
      UnlockDisplay(dpy);
      SyncHandle();
      TRACE("GetDeviceInfo... return False");
      return False;
   }

   *hFrameBuffer = rep.hFrameBufferLow;
   if (sizeof(drm_handle_t) == 8) {
      int shift = 32;           /* var to prevent warning on next line */
      *hFrameBuffer |= ((drm_handle_t) rep.hFrameBufferHigh) << shift;
   }

   *fbOrigin = rep.framebufferOrigin;
   *fbSize = rep.framebufferSize;
   *fbStride = rep.framebufferStride;
   *devPrivateSize = rep.devPrivateSize;

   if (rep.length) {
      if (!(*pDevPrivate = calloc(rep.devPrivateSize, 1))) {
         _XEatData(dpy, ((rep.devPrivateSize + 3) & ~3));
         UnlockDisplay(dpy);
         SyncHandle();
         TRACE("GetDeviceInfo... return False");
         return False;
      }
      _XRead(dpy, (char *) *pDevPrivate, rep.devPrivateSize);
   }
   else {
      *pDevPrivate = NULL;
   }

   UnlockDisplay(dpy);
   SyncHandle();
   TRACE("GetDeviceInfo... return True");
   return True;
}

Bool
XF86DRIOpenFullScreen(Display * dpy, int screen, Drawable drawable)
{
   /* This function and the underlying X protocol are deprecated.
    */
   (void) dpy;
   (void) screen;
   (void) drawable;
   return False;
}

Bool
XF86DRICloseFullScreen(Display * dpy, int screen, Drawable drawable)
{
   /* This function and the underlying X protocol are deprecated.
    */
   (void) dpy;
   (void) screen;
   (void) drawable;
   return True;
}

#endif /* GLX_DIRECT_RENDERING */