xlib: Integrate with llvmpipe.

Actually, the makefile/sconscript changes were already commit by mistake.

src/gallium/winsys/xlib/xlib_llvmpipe.c

@@ -0,0 +1,513 @@
+/**************************************************************************
+ * 
+ * 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 "xm_api.h"
+
+#undef ASSERT
+#undef Elements
+
+#include "pipe/internal/p_winsys_screen.h"
+#include "pipe/p_format.h"
+#include "pipe/p_context.h"
+#include "pipe/p_inlines.h"
+#include "util/u_math.h"
+#include "util/u_memory.h"
+#include "llvmpipe/lp_winsys.h"
+#include "llvmpipe/lp_texture.h"
+
+#include "xlib.h"
+
+/**
+ * Subclass of pipe_buffer for Xlib winsys.
+ * Low-level OS/window system memory buffer
+ */
+struct xm_buffer
+{
+   struct pipe_buffer base;
+   boolean userBuffer;  /** Is this a user-space buffer? */
+   void *data;
+   void *mapped;
+
+   XImage *tempImage;
+#ifdef USE_XSHM
+   int shm;
+   XShmSegmentInfo shminfo;
+#endif
+};
+
+
+/**
+ * Subclass of pipe_winsys for Xlib winsys
+ */
+struct xmesa_pipe_winsys
+{
+   struct pipe_winsys base;
+/*   struct xmesa_visual *xm_visual; */
+};
+
+
+
+/** Cast wrapper */
+static INLINE struct xm_buffer *
+xm_buffer( struct pipe_buffer *buf )
+{
+   return (struct xm_buffer *)buf;
+}
+
+
+/**
+ * X Shared Memory Image extension code
+ */
+
+#ifdef USE_XSHM
+
+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_buffer *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_buffer *b, struct xmesa_buffer *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 *);
+
+   b->tempImage = XShmCreateImage(xmb->xm_visual->display,
+                                  xmb->xm_visual->visinfo->visual,
+                                  xmb->xm_visual->visinfo->depth,
+                                  ZPixmap,
+                                  NULL,
+                                  &b->shminfo,
+                                  width, height);
+   if (b->tempImage == NULL) {
+      b->shm = 0;
+      return;
+   }
+
+
+   mesaXErrorFlag = 0;
+   old_handler = XSetErrorHandler(mesaHandleXError);
+   /* This may trigger the X protocol error we're ready to catch: */
+   XShmAttach(xmb->xm_visual->display, &b->shminfo);
+   XSync(xmb->xm_visual->display, False);
+
+   if (mesaXErrorFlag) {
+      /* we are on a remote display, this error is normal, don't print it */
+      XFlush(xmb->xm_visual->display);
+      mesaXErrorFlag = 0;
+      XDestroyImage(b->tempImage);
+      b->tempImage = NULL;
+      b->shm = 0;
+      (void) XSetErrorHandler(old_handler);
+      return;
+   }
+
+   b->shm = 1;
+}
+
+#endif /* USE_XSHM */
+
+
+
+/* Most callbacks map direcly onto dri_bufmgr operations:
+ */
+static void *
+xm_buffer_map(struct pipe_winsys *pws, struct pipe_buffer *buf,
+              unsigned flags)
+{
+   struct xm_buffer *xm_buf = xm_buffer(buf);
+   xm_buf->mapped = xm_buf->data;
+   return xm_buf->mapped;
+}
+
+static void
+xm_buffer_unmap(struct pipe_winsys *pws, struct pipe_buffer *buf)
+{
+   struct xm_buffer *xm_buf = xm_buffer(buf);
+   xm_buf->mapped = NULL;
+}
+
+static void
+xm_buffer_destroy(struct pipe_buffer *buf)
+{
+   struct xm_buffer *oldBuf = xm_buffer(buf);
+
+   if (oldBuf->data) {
+#ifdef USE_XSHM
+      if (oldBuf->shminfo.shmid >= 0) {
+         shmdt(oldBuf->shminfo.shmaddr);
+         shmctl(oldBuf->shminfo.shmid, IPC_RMID, 0);
+         
+         oldBuf->shminfo.shmid = -1;
+         oldBuf->shminfo.shmaddr = (char *) -1;
+      }
+      else
+#endif
+      {
+         if (!oldBuf->userBuffer) {
+            align_free(oldBuf->data);
+         }
+      }
+
+      oldBuf->data = NULL;
+   }
+
+   free(oldBuf);
+}
+
+
+/**
+ * Display/copy the image in the surface into the X window specified
+ * by the XMesaBuffer.
+ */
+static void
+xlib_llvmpipe_display_surface(struct xmesa_buffer *b,
+                              struct pipe_surface *surf)
+{
+   XImage *ximage;
+   struct llvmpipe_texture *spt = llvmpipe_texture(surf->texture);
+   struct xm_buffer *xm_buf = xm_buffer(spt->buffer);
+   static boolean no_swap = 0;
+   static boolean firsttime = 1;
+
+   if (firsttime) {
+      no_swap = getenv("SP_NO_RAST") != NULL;
+      firsttime = 0;
+   }
+
+   if (no_swap)
+      return;
+
+#ifdef USE_XSHM
+   if (xm_buf->shm)
+   {
+      if (xm_buf->tempImage == NULL) 
+      {
+         assert(surf->texture->block.width == 1);
+         assert(surf->texture->block.height == 1);
+         alloc_shm_ximage(xm_buf, b, spt->stride[surf->level] /
+                          surf->texture->block.size, surf->height);
+      }
+
+      ximage = xm_buf->tempImage;
+      ximage->data = xm_buf->data;
+
+      /* _debug_printf("XSHM\n"); */
+      XShmPutImage(b->xm_visual->display, b->drawable, b->gc,
+                   ximage, 0, 0, 0, 0, surf->width, surf->height, False);
+   }
+   else
+#endif
+   {
+      /* display image in Window */
+      ximage = b->tempImage;
+      ximage->data = xm_buf->data;
+
+      /* check that the XImage has been previously initialized */
+      assert(ximage->format);
+      assert(ximage->bitmap_unit);
+
+      /* update XImage's fields */
+      ximage->width = surf->width;
+      ximage->height = surf->height;
+      ximage->bytes_per_line = spt->stride[surf->level];
+
+      /* _debug_printf("XPUT\n"); */
+      XPutImage(b->xm_visual->display, b->drawable, b->gc,
+                ximage, 0, 0, 0, 0, surf->width, surf->height);
+   }
+}
+
+
+static void
+xm_flush_frontbuffer(struct pipe_winsys *pws,
+                     struct pipe_surface *surf,
+                     void *context_private)
+{
+   /*
+    * The front color buffer is actually just another XImage buffer.
+    * This function copies that XImage to the actual X Window.
+    */
+   XMesaContext xmctx = (XMesaContext) context_private;
+   xlib_llvmpipe_display_surface(xmctx->xm_buffer, surf);
+}
+
+
+
+static const char *
+xm_get_name(struct pipe_winsys *pws)
+{
+   return "Xlib";
+}
+
+
+static struct pipe_buffer *
+xm_buffer_create(struct pipe_winsys *pws, 
+                 unsigned alignment, 
+                 unsigned usage,
+                 unsigned size)
+{
+   struct xm_buffer *buffer = CALLOC_STRUCT(xm_buffer);
+
+   pipe_reference_init(&buffer->base.reference, 1);
+   buffer->base.alignment = alignment;
+   buffer->base.usage = usage;
+   buffer->base.size = size;
+
+   if (buffer->data == NULL) {
+      /* align to 16-byte multiple for Cell */
+      buffer->data = align_malloc(size, max(alignment, 16));
+   }
+
+   return &buffer->base;
+}
+
+
+/**
+ * Create buffer which wraps user-space data.
+ */
+static struct pipe_buffer *
+xm_user_buffer_create(struct pipe_winsys *pws, void *ptr, unsigned bytes)
+{
+   struct xm_buffer *buffer = CALLOC_STRUCT(xm_buffer);
+   pipe_reference_init(&buffer->base.reference, 1);
+   buffer->base.size = bytes;
+   buffer->userBuffer = TRUE;
+   buffer->data = ptr;
+
+   return &buffer->base;
+}
+
+
+static struct pipe_buffer *
+xm_surface_buffer_create(struct pipe_winsys *winsys,
+                         unsigned width, unsigned height,
+                         enum pipe_format format,
+                         unsigned usage,
+                         unsigned *stride)
+{
+   const unsigned alignment = 64;
+   struct pipe_format_block block;
+   unsigned nblocksx, nblocksy, size;
+
+   pf_get_block(format, &block);
+   nblocksx = pf_get_nblocksx(&block, width);
+   nblocksy = pf_get_nblocksy(&block, height);
+   *stride = align(nblocksx * block.size, alignment);
+   size = *stride * nblocksy;
+
+#ifdef USE_XSHM
+   if (!debug_get_bool_option("XLIB_NO_SHM", FALSE))
+   {
+      struct xm_buffer *buffer = CALLOC_STRUCT(xm_buffer);
+
+      pipe_reference_init(&buffer->base.reference, 1);
+      buffer->base.alignment = alignment;
+      buffer->base.usage = usage;
+      buffer->base.size = size;
+      buffer->userBuffer = FALSE;
+      buffer->shminfo.shmid = -1;
+      buffer->shminfo.shmaddr = (char *) -1;
+      buffer->shm = TRUE;
+         
+      buffer->data = alloc_shm(buffer, size);
+      if (!buffer->data)
+         goto out;
+
+      return &buffer->base;
+         
+   out:
+      if (buffer)
+         FREE(buffer);
+   }
+#endif
+   
+
+   return winsys->buffer_create(winsys, alignment,
+                                usage,
+                                size);
+}
+
+
+/*
+ * Fence functions - basically nothing to do, as we don't create any actual
+ * fence objects.
+ */
+
+static void
+xm_fence_reference(struct pipe_winsys *sws, struct pipe_fence_handle **ptr,
+                   struct pipe_fence_handle *fence)
+{
+}
+
+
+static int
+xm_fence_signalled(struct pipe_winsys *sws, struct pipe_fence_handle *fence,
+                   unsigned flag)
+{
+   return 0;
+}
+
+
+static int
+xm_fence_finish(struct pipe_winsys *sws, struct pipe_fence_handle *fence,
+                unsigned flag)
+{
+   return 0;
+}
+
+
+
+static struct pipe_winsys *
+xlib_create_llvmpipe_winsys( void )
+{
+   static struct xmesa_pipe_winsys *ws = NULL;
+
+   if (!ws) {
+      ws = CALLOC_STRUCT(xmesa_pipe_winsys);
+
+      /* Fill in this struct with callbacks that pipe will need to
+       * communicate with the window system, buffer manager, etc. 
+       */
+      ws->base.buffer_create = xm_buffer_create;
+      ws->base.user_buffer_create = xm_user_buffer_create;
+      ws->base.buffer_map = xm_buffer_map;
+      ws->base.buffer_unmap = xm_buffer_unmap;
+      ws->base.buffer_destroy = xm_buffer_destroy;
+
+      ws->base.surface_buffer_create = xm_surface_buffer_create;
+
+      ws->base.fence_reference = xm_fence_reference;
+      ws->base.fence_signalled = xm_fence_signalled;
+      ws->base.fence_finish = xm_fence_finish;
+
+      ws->base.flush_frontbuffer = xm_flush_frontbuffer;
+      ws->base.get_name = xm_get_name;
+   }
+
+   return &ws->base;
+}
+
+
+static struct pipe_screen *
+xlib_create_llvmpipe_screen( void )
+{
+   struct pipe_winsys *winsys;
+   struct pipe_screen *screen;
+
+   winsys = xlib_create_llvmpipe_winsys();
+   if (winsys == NULL)
+      return NULL;
+
+   screen = llvmpipe_create_screen(winsys);
+   if (screen == NULL)
+      goto fail;
+
+   return screen;
+
+fail:
+   if (winsys)
+      winsys->destroy( winsys );
+
+   return NULL;
+}
+
+
+static struct pipe_context *
+xlib_create_llvmpipe_context( struct pipe_screen *screen,
+                              void *context_private )
+{
+   struct pipe_context *pipe;
+   
+   pipe = llvmpipe_create(screen);
+   if (pipe == NULL)
+      goto fail;
+
+   pipe->priv = context_private;
+   return pipe;
+
+fail:
+   /* Free stuff here */
+   return NULL;
+}
+
+struct xm_driver xlib_llvmpipe_driver = 
+{
+   .create_pipe_screen = xlib_create_llvmpipe_screen,
+   .create_pipe_context = xlib_create_llvmpipe_context,
+   .display_surface = xlib_llvmpipe_display_surface
+};
+
+
+