1 files changed, 439 insertions, 0 deletions

diff --git a/src/gallium/winsys/xlib/xlib_sw_winsys.c b/src/gallium/winsys/xlib/xlib_sw_winsys.c
new file mode 100644
index 0000000000..29c642706a
--- /dev/null
+++ b/src/gallium/winsys/xlib/xlib_sw_winsys.c
@@ -0,0 +1,439 @@
+/**************************************************************************
+ * 
+ * Copyright 2007 Tungsten Graphics, Inc., Bismarck, ND., USA
+ * 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 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
+ * THE COPYRIGHT HOLDERS, AUTHORS 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.
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ * 
+ * 
+ **************************************************************************/
+
+/*
+ * Authors:
+ *   Keith Whitwell
+ *   Brian Paul
+ */
+
+#include "pipe/p_format.h"
+#include "pipe/p_context.h"
+#include "util/u_inlines.h"
+#include "util/u_format.h"
+#include "util/u_math.h"
+#include "util/u_memory.h"
+
+#include "state_tracker/xlib_sw_winsys.h"
+
+#include <X11/Xlib.h>
+#include <X11/Xlibint.h>
+#include <X11/Xutil.h>
+#include <sys/ipc.h>
+#include <sys/shm.h>
+#include <X11/extensions/XShm.h>
+
+/**
+ * Subclass of pipe_buffer for Xlib winsys.
+ * Low-level OS/window system memory buffer
+ */
+struct xm_displaytarget
+{
+   enum pipe_format format;
+   unsigned width;
+   unsigned height;
+   unsigned stride;
+
+   void *data;
+   void *mapped;
+
+   Display *display;
+   Visual *visual;
+   XImage *tempImage;
+   GC gc;
+
+   /* This is the last drawable that this display target was presented
+    * against.  May need to recreate gc, tempImage when this changes??
+    */
+   Drawable drawable;
+
+   XShmSegmentInfo shminfo;
+   int shm;
+};
+
+
+/**
+ * Subclass of sw_winsys for Xlib winsys
+ */
+struct xlib_sw_winsys
+{
+   struct sw_winsys base;
+
+
+
+   Display *display;
+};
+
+
+
+/** Cast wrapper */
+static INLINE struct xm_displaytarget *
+xm_displaytarget( struct sw_displaytarget *dt )
+{
+   return (struct xm_displaytarget *)dt;
+}
+
+
+/**
+ * X Shared Memory Image extension code
+ */
+
+static volatile int mesaXErrorFlag = 0;
+
+/**
+ * Catches potential Xlib errors.
+ */
+static int
+mesaHandleXError(Display *dpy, XErrorEvent *event)
+{
+   (void) dpy;
+   (void) event;
+   mesaXErrorFlag = 1;
+   return 0;
+}
+
+
+static char *alloc_shm(struct xm_displaytarget *buf, unsigned size)
+{
+   XShmSegmentInfo *const shminfo = & buf->shminfo;
+
+   shminfo->shmid = shmget(IPC_PRIVATE, size, IPC_CREAT|0777);
+   if (shminfo->shmid < 0) {
+      return NULL;
+   }
+
+   shminfo->shmaddr = (char *) shmat(shminfo->shmid, 0, 0);
+   if (shminfo->shmaddr == (char *) -1) {
+      shmctl(shminfo->shmid, IPC_RMID, 0);
+      return NULL;
+   }
+
+   shminfo->readOnly = False;
+   return shminfo->shmaddr;
+}
+
+
+/**
+ * Allocate a shared memory XImage back buffer for the given XMesaBuffer.
+ */
+static void
+alloc_shm_ximage(struct xm_displaytarget *xm_dt,
+                 struct xlib_drawable *xmb,
+                 unsigned width, unsigned height)
+{
+   /*
+    * We have to do a _lot_ of error checking here to be sure we can
+    * really use the XSHM extension.  It seems different servers trigger
+    * errors at different points if the extension won't work.  Therefore
+    * we have to be very careful...
+    */
+   int (*old_handler)(Display *, XErrorEvent *);
+
+   xm_dt->tempImage = XShmCreateImage(xm_dt->display,
+                                      xmb->visual,
+                                      xmb->depth,
+                                      ZPixmap,
+                                      NULL,
+                                      &xm_dt->shminfo,
+                                      width, height);
+   if (xm_dt->tempImage == NULL) {
+      xm_dt->shm = 0;
+      return;
+   }
+
+
+   mesaXErrorFlag = 0;
+   old_handler = XSetErrorHandler(mesaHandleXError);
+   /* This may trigger the X protocol error we're ready to catch: */
+   XShmAttach(xm_dt->display, &xm_dt->shminfo);
+   XSync(xm_dt->display, False);
+
+   if (mesaXErrorFlag) {
+      /* we are on a remote display, this error is normal, don't print it */
+      XFlush(xm_dt->display);
+      mesaXErrorFlag = 0;
+      XDestroyImage(xm_dt->tempImage);
+      xm_dt->tempImage = NULL;
+      xm_dt->shm = 0;
+      (void) XSetErrorHandler(old_handler);
+      return;
+   }
+
+   xm_dt->shm = 1;
+}
+
+
+static void
+alloc_ximage(struct xm_displaytarget *xm_dt,
+             struct xlib_drawable *xmb,
+             unsigned width, unsigned height)
+{
+   if (xm_dt->shm) {
+      alloc_shm_ximage(xm_dt, xmb, width, height);
+      return;
+   }
+
+   xm_dt->tempImage = XCreateImage(xm_dt->display,
+                                   xmb->visual,
+                                   xmb->depth,
+                                   ZPixmap, 0,
+                                   NULL, width, height,
+                                   8, 0);
+}
+
+static boolean
+xm_is_displaytarget_format_supported( struct sw_winsys *ws,
+                                      enum pipe_format format )
+{
+   /* TODO: check visuals or other sensible thing here */
+   return TRUE;
+}
+
+
+static void *
+xm_displaytarget_map(struct sw_winsys *ws,
+                     struct sw_displaytarget *dt,
+                     unsigned flags)
+{
+   struct xm_displaytarget *xm_dt = xm_displaytarget(dt);
+   xm_dt->mapped = xm_dt->data;
+   return xm_dt->mapped;
+}
+
+static void
+xm_displaytarget_unmap(struct sw_winsys *ws,
+                       struct sw_displaytarget *dt)
+{
+   struct xm_displaytarget *xm_dt = xm_displaytarget(dt);
+   xm_dt->mapped = NULL;
+}
+
+static void
+xm_displaytarget_destroy(struct sw_winsys *ws,
+                         struct sw_displaytarget *dt)
+{
+   struct xm_displaytarget *xm_dt = xm_displaytarget(dt);
+
+   if (xm_dt->data) {
+      if (xm_dt->shminfo.shmid >= 0) {
+         shmdt(xm_dt->shminfo.shmaddr);
+         shmctl(xm_dt->shminfo.shmid, IPC_RMID, 0);
+         
+         xm_dt->shminfo.shmid = -1;
+         xm_dt->shminfo.shmaddr = (char *) -1;
+      }
+      else {
+         FREE(xm_dt->data);
+      }
+   }
+
+   if (xm_dt->tempImage)
+      XDestroyImage(xm_dt->tempImage);
+
+   if (xm_dt->gc)
+      XFreeGC(xm_dt->display, xm_dt->gc);
+
+   FREE(xm_dt);
+}
+
+
+/**
+ * Display/copy the image in the surface into the X window specified
+ * by the XMesaBuffer.
+ */
+static void
+xlib_sw_display(struct xlib_drawable *xlib_drawable,
+                struct sw_displaytarget *dt)
+{
+   static boolean no_swap = 0;
+   static boolean firsttime = 1;
+   struct xm_displaytarget *xm_dt = xm_displaytarget(dt);
+   Display *display = xm_dt->display;
+   XImage *ximage;
+
+   if (firsttime) {
+      no_swap = getenv("SP_NO_RAST") != NULL;
+      firsttime = 0;
+   }
+
+   if (no_swap)
+      return;
+
+   if (xm_dt->drawable != xlib_drawable->drawable) {
+      if (xm_dt->gc) {
+         XFreeGC( display, xm_dt->gc );
+         xm_dt->gc = NULL;
+      }
+
+      if (xm_dt->tempImage) {
+         XDestroyImage( xm_dt->tempImage );
+         xm_dt->tempImage = NULL;
+      }
+
+      xm_dt->drawable = xlib_drawable->drawable;
+   }
+
+   if (xm_dt->tempImage == NULL) {
+      assert(util_format_get_blockwidth(xm_dt->format) == 1);
+      assert(util_format_get_blockheight(xm_dt->format) == 1);
+      alloc_ximage(xm_dt, xlib_drawable,
+                   xm_dt->stride / util_format_get_blocksize(xm_dt->format),
+                   xm_dt->height);
+      if (!xm_dt->tempImage)
+         return;
+   }
+
+   if (xm_dt->gc == NULL) {
+      xm_dt->gc = XCreateGC( display, xlib_drawable->drawable, 0, NULL );
+      XSetFunction( display, xm_dt->gc, GXcopy );
+   }
+
+   if (xm_dt->shm)
+   {
+      ximage = xm_dt->tempImage;
+      ximage->data = xm_dt->data;
+
+      /* _debug_printf("XSHM\n"); */
+      XShmPutImage(xm_dt->display, xlib_drawable->drawable, xm_dt->gc,
+                   ximage, 0, 0, 0, 0, xm_dt->width, xm_dt->height, False);
+   }
+   else {
+      /* display image in Window */
+      ximage = xm_dt->tempImage;
+      ximage->data = xm_dt->data;
+
+      /* check that the XImage has been previously initialized */
+      assert(ximage->format);
+      assert(ximage->bitmap_unit);
+
+      /* update XImage's fields */
+      ximage->width = xm_dt->width;
+      ximage->height = xm_dt->height;
+      ximage->bytes_per_line = xm_dt->stride;
+
+      /* _debug_printf("XPUT\n"); */
+      XPutImage(xm_dt->display, xlib_drawable->drawable, xm_dt->gc,
+                ximage, 0, 0, 0, 0, xm_dt->width, xm_dt->height);
+   }
+}
+
+/**
+ * Display/copy the image in the surface into the X window specified
+ * by the XMesaBuffer.
+ */
+static void
+xm_displaytarget_display(struct sw_winsys *ws,
+                         struct sw_displaytarget *dt,
+                         void *context_private)
+{
+   struct xlib_drawable *xlib_drawable = (struct xlib_drawable *)context_private;
+   xlib_sw_display(xlib_drawable, dt);
+}
+
+
+static struct sw_displaytarget *
+xm_displaytarget_create(struct sw_winsys *winsys,
+                        enum pipe_format format,
+                        unsigned width, unsigned height,
+                        unsigned alignment,
+                        unsigned *stride)
+{
+   struct xm_displaytarget *xm_dt = CALLOC_STRUCT(xm_displaytarget);
+   unsigned nblocksy, size;
+
+   xm_dt = CALLOC_STRUCT(xm_displaytarget);
+   if(!xm_dt)
+      goto no_xm_dt;
+
+   xm_dt->display = ((struct xlib_sw_winsys *)winsys)->display;
+   xm_dt->format = format;
+   xm_dt->width = width;
+   xm_dt->height = height;
+
+   nblocksy = util_format_get_nblocksy(format, height);
+   xm_dt->stride = align(util_format_get_stride(format, width), alignment);
+   size = xm_dt->stride * nblocksy;
+
+   if (!debug_get_bool_option("XLIB_NO_SHM", FALSE))
+   {
+      xm_dt->shminfo.shmid = -1;
+      xm_dt->shminfo.shmaddr = (char *) -1;
+      xm_dt->shm = TRUE;
+         
+      xm_dt->data = alloc_shm(xm_dt, size);
+      if(!xm_dt->data)
+         goto no_data;
+   }
+
+   if(!xm_dt->data) {
+      xm_dt->data = align_malloc(size, alignment);
+      if(!xm_dt->data)
+         goto no_data;
+   }
+
+   *stride = xm_dt->stride;
+   return (struct sw_displaytarget *)xm_dt;
+
+no_data:
+   FREE(xm_dt);
+no_xm_dt:
+   return NULL;
+}
+
+
+static void
+xm_destroy( struct sw_winsys *ws )
+{
+   FREE(ws);
+}
+
+
+struct sw_winsys *
+xlib_create_sw_winsys( Display *display )
+{
+   struct xlib_sw_winsys *ws;
+
+   ws = CALLOC_STRUCT(xlib_sw_winsys);
+   if (!ws)
+      return NULL;
+
+   ws->display = display;
+   ws->base.destroy = xm_destroy;
+
+   ws->base.is_displaytarget_format_supported = xm_is_displaytarget_format_supported;
+
+   ws->base.displaytarget_create = xm_displaytarget_create;
+   ws->base.displaytarget_map = xm_displaytarget_map;
+   ws->base.displaytarget_unmap = xm_displaytarget_unmap;
+   ws->base.displaytarget_destroy = xm_displaytarget_destroy;
+
+   ws->base.displaytarget_display = xm_displaytarget_display;
+
+   return &ws->base;
+}
+