drm/sw: Wip drm winsys

This winsys wraps a drm_api in order abstract away the different
memory manager. It also needs help from a pipe screen wrapper.
That wrapper is included in the same file but could be moved out
into a generic file.

3 files changed, 308 insertions, 0 deletions

diff --git a/src/gallium/include/state_tracker/xm_winsys.h b/src/gallium/include/state_tracker/xm_winsys.h
index c928be0ba3..5e2b5ee8be 100644
--- a/src/gallium/include/state_tracker/xm_winsys.h
+++ b/src/gallium/include/state_tracker/xm_winsys.h
@@ -131,6 +131,14 @@ struct sw_driver {
    struct pipe_screen *(*create_screen)( struct sw_driver *driver,
 					 struct sw_callbacks *callbacks );
 
+   struct pipe_texture *(*wrap_displaytarget)( struct sw_driver *driver,
+                                               struct pipe_screen *screen,
+                                               struct pipe_texture *templ,
+                                               struct sw_displaytarget *dt );
+
+   struct sw_displaytarget *(*get_displaytarget)( struct sw_driver *driver,
+                                                  struct pipe_texture *tex );
+
    /* No call to wrap a display target and create a texture.  Hope
     * that the callback mechanism is sufficient for now.
     */
diff --git a/src/gallium/winsys/drm/sw/Makefile b/src/gallium/winsys/drm/sw/Makefile
new file mode 100644
index 0000000000..2add161a62
--- /dev/null
+++ b/src/gallium/winsys/drm/sw/Makefile
@@ -0,0 +1,13 @@
+TOP = ../../../../..
+include $(TOP)/configs/current
+
+LIBNAME = swdrm
+
+C_SOURCES = \
+	sw_drm_api.c
+
+LIBRARY_INCLUDES =
+
+LIBRARY_DEFINES =
+
+include ../../../Makefile.template
diff --git a/src/gallium/winsys/drm/sw/sw_drm_api.c b/src/gallium/winsys/drm/sw/sw_drm_api.c
new file mode 100644
index 0000000000..21f44a2a62
--- /dev/null
+++ b/src/gallium/winsys/drm/sw/sw_drm_api.c
@@ -0,0 +1,287 @@
+/**************************************************************************
+ *
+ * Copyright © 2010 Jakob Bornecrantz
+ *
+ * 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 (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 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 "pipe/p_format.h"
+#include "pipe/p_state.h"
+
+#include "state_tracker/drm_api.h"
+#include "state_tracker/xm_winsys.h"
+
+#include "util/u_memory.h"
+#include "util/u_inlines.h"
+
+#include "trace/tr_drm.h"
+
+/*
+ * XXX The sw_pipe_* code is generic and should be move out.
+ *
+ * This code wraps a pipe_screen and exposes a sw_callbacks interface
+ * for use in 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).
+ */
+
+struct sw_pipe_callbacks
+{
+   struct sw_callbacks base;
+   struct pipe_screen *screen;
+};
+
+struct sw_pipe_displatarget
+{
+   struct pipe_texture *tex;
+   struct pipe_transfer *transfer;
+};
+
+static INLINE struct sw_pipe_callbacks *
+sw_pipe_callbacks(struct sw_callbacks *swc)
+{
+   return (struct sw_pipe_callbacks *)swc;
+}
+
+static INLINE struct pipe_texture *
+sw_pipe_dt_get_texture(struct sw_displaytarget *dt)
+{
+   struct sw_pipe_displatarget *swpdt = (struct sw_pipe_displatarget *)dt;
+   return swpdt->tex;
+}
+
+static INLINE struct sw_displaytarget *
+sw_pipe_dt_wrap_texture(struct pipe_texture *tex)
+{
+   struct sw_pipe_displatarget *swpdt = CALLOC_STRUCT(sw_pipe_displatarget);
+   swpdt->tex = tex;
+   return (struct sw_displaytarget *)swpdt;
+}
+
+static struct sw_displaytarget *
+swpc_dt_create(struct sw_callbacks *swc,
+               enum pipe_format format,
+               unsigned width, unsigned height,
+               unsigned alignment,
+               unsigned *stride)
+{
+   struct sw_pipe_callbacks *swpc = sw_pipe_callbacks(swc);
+   struct pipe_texture templ;
+   struct pipe_texture *tex;
+   memset(&templ, 0, sizeof(templ));
+
+   templ->width0 = width;
+   templ->height0 = height;
+   templ->format = format;
+   /*
+    * XXX How do we tell the difference between displaytargets and primary (scanout)?
+    * Aslo should all be rendertargets?
+    * What about depthstencil?
+    * XXX we pretty much need get usage passed down, maybe even the template.
+    */
+   templ->usage = 0;
+   /* XXX alignment isn't needed for DRM platform */
+   /* XXX stride isn't needed for DRM platform */
+
+   tex = swpc->screen->texture_create(swpc->screen, &templ);
+
+   return sw_pipe_dt_wrap_texture(tex);
+}
+
+static void *
+swpc_dt_map(struct sw_callbacks *ws, 
+            struct sw_displaytarget *dt,
+            unsigned flags)
+{
+   /* XXX use transfer */
+   return NULL;
+}
+
+static void
+swpc_dt_unmap(struct sw_callbacks *ws,
+              struct sw_displaytarget *dt)
+{
+   /* XXX unmap transfer */
+}
+
+static void 
+swpc_dt_destroy(struct sw_callbacks *ws, 
+                struct sw_displaytarget *dt)
+{
+   struct sw_pipe_displatarget *swpdt = (struct sw_pipe_displatarget *)dt;
+
+   pipe_texture_reference(&swpdt->tex, NULL);
+
+   FREE(swpdt);
+}
+
+static void
+swpc_destroy(struct sw_callbacks *swc)
+{
+   struct sw_pipe_callbacks *swpc = sw_pipe_callbacks(swc);
+
+   swpc->screen->destroy(swpc->screen);
+
+   FREE(swpc);
+}
+
+static struct sw_callbacks *
+sw_callbacks_warp_pipe_screen(struct pipe_screen *pipe)
+{
+   struct sw_pipe_callbacks *swpc = CALLOC_STRUCT(sw_pipe_callbacks);
+
+   swpc->base.displaytarget_create = swpc_dt_create;
+   swpc->base.displaytarget_map = swpc_dt_map;
+   swpc->base.displaytarget_unmap = swpc_dt_unmap;
+   swpc->base.displaytarget_destroy = swpc_dt_destroy;
+   swpc->base.destroy = swpc_destroy;
+
+   return &swpc->base;
+}
+
+
+/*
+ * XXX Should be moved out into header file.
+ */
+
+struct drm_api * sw_drm_api_create(struct drm_api *api);
+
+
+/*
+ * Defines
+ */
+
+struct sw_drm_api
+{
+   struct drm_api base;
+   struct drm_api *api;
+   struct sw_driver *sw;
+};
+
+static INLINE struct sw_drm_api *
+sw_drm_api(struct drm_api *api)
+{
+   return (struct sw_drm_api *)api;
+}
+
+
+/*
+ * Exported functions
+ */
+
+static struct pipe_texture *
+sw_drm_texture_from_shared_handle(struct drm_api *_api,
+                                  struct pipe_screen *_screen,
+                                  struct pipe_texture *templ,
+                                  const char* name,
+                                  unsigned pitch,
+                                  unsigned handle)
+{
+   struct sw_drm_api *swapi = sw_drm_api(_api);
+   struct drm_api *api = swapi->api;
+   struct pipe_screen *screen = NULL/* XXX GET? */;
+   struct sw_displaytarget *dt;
+   struct pipe_texture *tex;
+
+   tex = api->texture_from_shared_handle(api, screen, templ, name, pitch, handle);
+   dt = sw_pipe_dt_wrap_texture(tex);
+
+   return swapi->sw->wrap_displaytarget(swapi->sw, _screen, templ, dt);
+}
+
+static boolean
+sw_drm_shared_handle_from_texture(struct drm_api *_api,
+                                  struct pipe_screen *_screen,
+                                  struct pipe_texture *_tex,
+                                  unsigned *pitch,
+                                  unsigned *handle)
+{
+   struct sw_drm_api *swapi = sw_drm_api(_api);
+   struct drm_api *api = swapi->api;
+   struct sw_displaytarget *dt = swapi->sw->get_displaytarget(swapi->sw, _tex);
+   struct pipe_texture *tex = sw_pipe_dt_get_texture(dt);
+   struct pipe_screen *screen = tex->screen;
+
+   return api->shared_handle_from_texture(api, screen, tex, pitch, handle);
+}
+
+static boolean
+sw_drm_local_handle_from_texture(struct drm_api *_api,
+                                 struct pipe_screen *_screen,
+                                 struct pipe_texture *_tex,
+                                 unsigned *pitch,
+                                 unsigned *handle)
+{
+   struct sw_drm_api *swapi = sw_drm_api(_api);
+   struct drm_api *api = swapi->api;
+   struct sw_displaytarget *dt = swapi->sw->get_displaytarget(swapi->sw, _tex);
+   struct pipe_texture *tex = sw_pipe_dt_get_texture(dt);
+   struct pipe_screen *screen = tex->screen;
+
+   return api->local_handle_from_texture(api, screen, tex, pitch, handle);
+}
+
+static struct pipe_screen *
+sw_drm_create_screen(struct drm_api *_api, int drmFD,
+                     struct drm_create_screen_arg *arg)
+{
+   struct sw_drm_api *swapi = sw_drm_api(_api);
+   struct drm_api *api = swapi->api;
+   struct sw_callbacks *swc;
+   struct pipe_screen *screen;
+
+   screen = api->create_screen(api, drmFD, arg);
+
+   swc = sw_callbacks_warp_pipe_screen(screen);
+
+   return swapi->sw->create_screen(swapi->sw, swc);
+}
+
+static void
+sw_drm_destroy(struct drm_api *api)
+{
+   struct sw_drm_api *swapi = sw_drm_api(api);
+   if (swapi->api->destroy)
+      swapi->api->destroy(swapi->api);
+
+   FREE(swapi);
+}
+
+struct drm_api *
+sw_drm_api_create(struct drm_api *api)
+{
+   struct sw_drm_api *swapi = CALLOC_STRUCT(sw_drm_api);
+
+   swapi->base.name = "sw";
+   swapi->base.driver_name = api->driver_name;
+   swapi->base.create_screen = sw_drm_create_screen;
+   swapi->base.texture_from_shared_handle = sw_drm_texture_from_shared_handle;
+   swapi->base.shared_handle_from_texture = sw_drm_shared_handle_from_texture;
+   swapi->base.local_handle_from_texture = sw_drm_local_handle_from_texture;
+   swapi->base.destroy = sw_drm_destroy;
+
+   return trace_drm_create(&swapi->base);
+}