gallium/targets: Add vdpau target for nouveau

Should fall back to shader based decoding (g3dvl) for now.

This is probably broken on systems that support xvmc, because
nouveau_video_buffer_create has no way to know for what api
the buffer is created, so I think this call might need a
separate argument as workaround.

Signed-off-by: Maarten Lankhorst <m.b.lankhorst@gmail.com>

configure.ac

@@ -1858,7 +1858,7 @@ if test "x$with_gallium_drivers" != x; then
         xnouveau)
             PKG_CHECK_MODULES([NOUVEAU], [libdrm_nouveau >= $LIBDRM_NOUVEAU_REQUIRED])
             GALLIUM_DRIVERS_DIRS="$GALLIUM_DRIVERS_DIRS nouveau nvfx nv50 nvc0"
-            gallium_check_st "nouveau/drm" "dri-nouveau" "xorg-nouveau" "" "xvmc-nouveau"
+            gallium_check_st "nouveau/drm" "dri-nouveau" "xorg-nouveau" "" "xvmc-nouveau" "vdpau-nouveau"
             ;;
         xswrast)
             GALLIUM_DRIVERS_DIRS="$GALLIUM_DRIVERS_DIRS softpipe"

src/gallium/targets/vdpau-nouveau/Makefile

@@ -0,0 +1,28 @@
+TOP = ../../../..
+include $(TOP)/configs/current
+
+LIBBASENAME = vdpau_nouveau
+
+PIPE_DRIVERS = \
+	$(TOP)/src/gallium/winsys/g3dvl/dri/libvldri.a \
+	$(TOP)/src/gallium/winsys/nouveau/drm/libnouveaudrm.a \
+	$(TOP)/src/gallium/drivers/nvfx/libnvfx.a \
+	$(TOP)/src/gallium/drivers/nv50/libnv50.a \
+	$(TOP)/src/gallium/drivers/nvc0/libnvc0.a \
+	$(TOP)/src/gallium/drivers/nouveau/libnouveau.a \
+	$(TOP)/src/gallium/drivers/trace/libtrace.a \
+	$(TOP)/src/gallium/auxiliary/libgallium.a
+
+
+C_SOURCES = \
+	target.c \
+	$(COMMON_GALLIUM_SOURCES) \
+	$(DRIVER_SOURCES)
+
+DRIVER_LIBS = $(shell $(PKG_CONFIG) libdrm_nouveau --libs) -lXfixes
+
+LINK_WITH_CXX=1
+
+include ../Makefile.vdpau
+
+symlinks:

src/gallium/targets/vdpau-nouveau/target.c

@@ -0,0 +1,18 @@
+#include "state_tracker/drm_driver.h"
+#include "target-helpers/inline_debug_helper.h"
+#include "nouveau/drm/nouveau_drm_public.h"
+
+static struct pipe_screen *create_screen(int fd)
+{
+   struct pipe_screen *screen;
+
+   screen = nouveau_drm_screen_create(fd);
+   if (!screen)
+      return NULL;
+
+   screen = debug_screen_wrap(screen);
+
+   return screen;
+}
+
+DRM_DRIVER_DESCRIPTOR("nouveau", "nouveau", create_screen, NULL)