1 files changed, 282 insertions, 0 deletions
diff --git a/src/gallium/winsys/sw/wrapper/wrapper_sw_winsys.c b/src/gallium/winsys/sw/wrapper/wrapper_sw_winsys.c
new file mode 100644
index 0000000000..459b1c1e2a
--- /dev/null
+++ b/src/gallium/winsys/sw/wrapper/wrapper_sw_winsys.c
@@ -0,0 +1,282 @@
+/**********************************************************
+ * Copyright 2010 VMware, 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 and this permission notice 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 THE AUTHORS OR COPYRIGHT HOLDERS
+ * 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.
+ *
+ **********************************************************/
+
+
+#include "wrapper_sw_winsys.h"
+
+#include "pipe/p_format.h"
+#include "pipe/p_state.h"
+
+#include "state_tracker/sw_winsys.h"
+
+#include "util/u_memory.h"
+#include "util/u_inlines.h"
+
+/*
+ * This code wraps a pipe_screen and exposes a sw_winsys interface for use
+ * with software resterizers. This code is used by the DRM based winsys to
+ * allow access to the drm driver.
+ *
+ * We must borrow the whole stack because only the pipe screen knows how
+ * to decode the content of a buffer. Or how to create a buffer that
+ * can still be used by drivers using real hardware (as the case is
+ * with software st/xorg but hw st/dri).
+ *
+ * We also need a pipe context for the transfers.
+ */
+
+struct wrapper_sw_winsys
+{
+   struct sw_winsys base;
+   struct pipe_screen *screen;
+   struct pipe_context *pipe;
+};
+
+struct wrapper_sw_displaytarget
+{
+   struct wrapper_sw_winsys *winsys;
+   struct pipe_texture *tex;
+   struct pipe_transfer *transfer;
+
+   unsigned width;
+   unsigned height;
+   unsigned map_count;
+   unsigned stride; /**< because we give stride at create */
+   void *ptr;
+};
+
+static INLINE struct wrapper_sw_winsys *
+wrapper_sw_winsys(struct sw_winsys *ws)
+{
+   return (struct wrapper_sw_winsys *)ws;
+}
+
+static INLINE struct wrapper_sw_displaytarget *
+wrapper_sw_displaytarget(struct sw_displaytarget *dt)
+{
+   return (struct wrapper_sw_displaytarget *)dt;
+}
+
+
+/*
+ * Functions
+ */
+
+
+static boolean
+wsw_dt_get_stride(struct wrapper_sw_displaytarget *wdt, unsigned *stride)
+{
+   struct pipe_context *pipe = wdt->winsys->pipe;
+   struct pipe_texture *tex = wdt->tex;
+   struct pipe_transfer *tr;
+
+   tr = pipe->get_tex_transfer(pipe, tex, 0, 0, 0,
+                               PIPE_TRANSFER_READ_WRITE,
+                               0, 0, wdt->width, wdt->height);
+   if (!tr)
+      return FALSE;
+
+   *stride = tr->stride;
+   wdt->stride = tr->stride;
+
+   pipe->tex_transfer_destroy(pipe, tr);
+
+   return TRUE;
+}
+
+static struct sw_displaytarget *
+wsw_dt_wrap_texture(struct wrapper_sw_winsys *wsw,
+                    struct pipe_texture *tex, unsigned *stride)
+{
+   struct wrapper_sw_displaytarget *wdt = CALLOC_STRUCT(wrapper_sw_displaytarget);
+   if (!wdt)
+      goto err_unref;
+
+   wdt->tex = tex;
+   wdt->winsys = wsw;
+
+   if (!wsw_dt_get_stride(wdt, stride))
+      goto err_free;
+
+   return (struct sw_displaytarget *)wdt;
+
+err_free:
+   FREE(wdt);
+err_unref:
+   pipe_texture_reference(&tex, NULL);
+   return NULL;
+}
+
+static struct sw_displaytarget *
+wsw_dt_create(struct sw_winsys *ws,
+              unsigned tex_usage,
+              enum pipe_format format,
+              unsigned width, unsigned height,
+              unsigned alignment,
+              unsigned *stride)
+{
+   struct wrapper_sw_winsys *wsw = wrapper_sw_winsys(ws);
+   struct pipe_texture templ;
+   struct pipe_texture *tex;
+
+   /*
+    * XXX Why don't we just get the template.
+    */
+   memset(&templ, 0, sizeof(templ));
+   templ.width0 = width;
+   templ.height0 = height;
+   templ.format = format;
+   templ.tex_usage = tex_usage;
+
+   /* XXX alignment: we can't do anything about this */
+
+   tex = wsw->screen->texture_create(wsw->screen, &templ);
+   if (!tex)
+      return NULL;
+
+   return wsw_dt_wrap_texture(wsw, tex, stride);
+}
+
+static struct sw_displaytarget *
+wsw_dt_from_handle(struct sw_winsys *ws,
+                   const struct pipe_texture *templ,
+                   struct winsys_handle *whandle,
+                   unsigned *stride)
+{
+   struct wrapper_sw_winsys *wsw = wrapper_sw_winsys(ws);
+   struct pipe_texture *tex;
+
+   tex = wsw->screen->texture_from_handle(wsw->screen, templ, whandle);
+   if (!tex)
+      return NULL;
+
+   return wsw_dt_wrap_texture(wsw, tex, stride);
+}
+
+static void *
+wsw_dt_map(struct sw_winsys *ws,
+           struct sw_displaytarget *dt,
+           unsigned flags)
+{
+   struct wrapper_sw_displaytarget *wdt = wrapper_sw_displaytarget(dt);
+   struct pipe_context *pipe = wdt->winsys->pipe;
+   struct pipe_texture *tex = wdt->tex;
+   struct pipe_transfer *tr;
+   void *ptr;
+
+   if (!wdt->map_count) {
+
+      assert(!wdt->transfer);
+
+      tr = pipe->get_tex_transfer(pipe, tex, 0, 0, 0,
+                                  PIPE_TRANSFER_READ_WRITE,
+                                  0, 0, wdt->width, wdt->height);
+      if (!tr)
+         return NULL;
+
+      ptr = pipe->transfer_map(pipe, tr);
+      if (!ptr)
+        goto err;
+
+      wdt->transfer = tr;
+      wdt->ptr = ptr;
+
+      /* XXX Handle this case */
+      assert(tr->stride == wdt->stride);
+   }
+
+   wdt->map_count++;
+
+   return wdt->ptr;
+
+err:
+   pipe->tex_transfer_destroy(pipe, tr);
+   return NULL;
+}
+
+static void
+wsw_dt_unmap(struct sw_winsys *ws,
+             struct sw_displaytarget *dt)
+{
+   struct wrapper_sw_displaytarget *wdt = wrapper_sw_displaytarget(dt);
+   struct pipe_context *pipe = wdt->winsys->pipe;
+
+   assert(wdt->transfer);
+
+   wdt->map_count--;
+
+   if (wdt->map_count)
+      return;
+
+   pipe->transfer_unmap(pipe, wdt->transfer);
+   pipe->tex_transfer_destroy(pipe, wdt->transfer);
+   wdt->transfer = NULL;
+}
+
+static void
+wsw_dt_destroy(struct sw_winsys *ws,
+               struct sw_displaytarget *dt)
+{
+   struct wrapper_sw_displaytarget *wdt = wrapper_sw_displaytarget(dt);
+
+   pipe_texture_reference(&wdt->tex, NULL);
+
+   FREE(wdt);
+}
+
+static void
+wsw_destroy(struct sw_winsys *ws)
+{
+   struct wrapper_sw_winsys *wsw = wrapper_sw_winsys(ws);
+
+   wsw->pipe->destroy(wsw->pipe);
+   wsw->screen->destroy(wsw->screen);
+
+   FREE(wsw);
+}
+
+struct sw_winsys *
+wrapper_sw_winsys_warp_pipe_screen(struct pipe_screen *screen)
+{
+   struct wrapper_sw_winsys *wsw = CALLOC_STRUCT(wrapper_sw_winsys);
+
+   wsw->base.displaytarget_create = wsw_dt_create;
+   wsw->base.displaytarget_from_handle = wsw_dt_from_handle;
+   wsw->base.displaytarget_map = wsw_dt_map;
+   wsw->base.displaytarget_unmap = wsw_dt_unmap;
+   wsw->base.displaytarget_destroy = wsw_dt_destroy;
+   wsw->base.destroy = wsw_destroy;
+
+   wsw->screen = screen;
+   wsw->pipe = screen->context_create(screen, NULL);
+   if (!wsw->pipe)
+      goto err;
+
+   return &wsw->base;
+
+err:
+   FREE(wsw);
+   return NULL;
+}