target-hepers: add non inline sw helpers

Feeling rather dirty copying the inline ones, yet we need the inline
ones for swrast only targets like libgl-xlib, osmesa.

Cc: "11.1" <mesa-stable@lists.freedesktop.org>
Cc: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: Edward O'Callaghan <edward.ocallaghan@koparo.com>
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Tested-by: Oded Gabbay <oded.gabbay@gmail.com>
Tested-by: Nick Sarnie <commendsarnex@gmail.com>

src/gallium/auxiliary/target-helpers/sw_helper.h

@@ -0,0 +1,73 @@
+
+#ifndef SW_HELPER_H
+#define SW_HELPER_H
+
+#include "pipe/p_compiler.h"
+#include "util/u_debug.h"
+#include "target-helpers/sw_helper_public.h"
+#include "state_tracker/sw_winsys.h"
+
+
+/* Helper function to choose and instantiate one of the software rasterizers:
+ * llvmpipe, softpipe.
+ */
+
+#ifdef GALLIUM_SOFTPIPE
+#include "softpipe/sp_public.h"
+#endif
+
+#ifdef GALLIUM_LLVMPIPE
+#include "llvmpipe/lp_public.h"
+#endif
+
+#ifdef GALLIUM_VIRGL
+#include "virgl/virgl_public.h"
+#include "virgl/vtest/virgl_vtest_public.h"
+#endif
+
+static inline struct pipe_screen *
+sw_screen_create_named(struct sw_winsys *winsys, const char *driver)
+{
+   struct pipe_screen *screen = NULL;
+
+#if defined(GALLIUM_LLVMPIPE)
+   if (screen == NULL && strcmp(driver, "llvmpipe") == 0)
+      screen = llvmpipe_create_screen(winsys);
+#endif
+
+#if defined(GALLIUM_VIRGL)
+   if (screen == NULL && strcmp(driver, "virpipe") == 0) {
+      struct virgl_winsys *vws;
+      vws = virgl_vtest_winsys_wrap(winsys);
+      screen = virgl_create_screen(vws);
+   }
+#endif
+
+#if defined(GALLIUM_SOFTPIPE)
+   if (screen == NULL)
+      screen = softpipe_create_screen(winsys);
+#endif
+
+   return screen;
+}
+
+
+struct pipe_screen *
+sw_screen_create(struct sw_winsys *winsys)
+{
+   const char *default_driver;
+   const char *driver;
+
+#if defined(GALLIUM_LLVMPIPE)
+   default_driver = "llvmpipe";
+#elif defined(GALLIUM_SOFTPIPE)
+   default_driver = "softpipe";
+#else
+   default_driver = "";
+#endif
+
+   driver = debug_get_option("GALLIUM_DRIVER", default_driver);
+   return sw_screen_create_named(winsys, driver);
+}
+
+#endif

src/gallium/auxiliary/target-helpers/sw_helper_public.h

@@ -0,0 +1,10 @@
+#ifndef _SW_HELPER_PUBLIC_H
+#define _SW_HELPER_PUBLIC_H
+
+struct pipe_screen;
+struct sw_winsys;
+
+struct pipe_screen *
+sw_screen_create(struct sw_winsys *winsys);
+
+#endif /* _SW_HELPER_PUBLIC_H */