gallium: Add pipe loader for device enumeration and driver multiplexing.

The goal is to have a uniform interface to create winsys and
pipe_screen instances for any driver, exposing the device enumeration
capabilities that might be supported by the operating system (for now
there's a "drm" back-end using udev and a "sw" back-end that always
returns the same built-in devices).

The typical use case of this library will be:
>
> struct pipe_loader_device devs[n];
> struct pipe_screen *screen;
>
> pipe_loader_probe(&devs, n);
>[pick some device from the array...]
>
> screen = pipe_loader_create_screen(dev, library_search_path);
>[do something with screen...]
>
> screen->destroy(screen);
> pipe_loader_release(&devs, N);
>

A part of the code was taken from targets/gbm/pipe_loader.c, which
will be removed and replaced with calls into this library by a future
commit.

1 files changed, 38 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/pipe-loader/Makefile.am b/src/gallium/auxiliary/pipe-loader/Makefile.am
new file mode 100644
index 00000000000..c63dce3fe4a
--- /dev/null
+++ b/src/gallium/auxiliary/pipe-loader/Makefile.am
@@ -0,0 +1,38 @@
+AUTOMAKE_OPTIONS = subdir-objects
+
+AM_CPPFLAGS = $(DEFINES) \
+	$(GALLIUM_PIPE_LOADER_DEFINES) \
+	-I$(top_srcdir)/include \
+	-I$(top_srcdir)/src/gallium/include \
+	-I$(top_srcdir)/src/gallium/auxiliary \
+	-I$(top_srcdir)/src/gallium/winsys
+
+AM_CFLAGS = $(PIC_FLAGS)
+
+noinst_LTLIBRARIES =
+
+if HAVE_LOADER_GALLIUM
+noinst_LTLIBRARIES += libpipe_loader.la
+
+libpipe_loader_la_SOURCES = \
+	pipe_loader.h \
+	pipe_loader_priv.h \
+	pipe_loader.c \
+	pipe_loader_sw.c
+
+if HAVE_DRM_LOADER_GALLIUM
+libpipe_loader_la_SOURCES += pipe_loader_drm.c
+AM_CFLAGS += $(LIBDRM_CFLAGS)
+endif
+
+# Provide compatibility with scripts for the old Mesa build system for
+# a while by putting a link to the library in the current directory.
+all-local: libpipe_loader.la
+	ln -f .libs/libpipe_loader.a .
+
+clean-local:
+	rm -f libpipe_loader.a
+endif
+
+# FIXME: Remove when the rest of Gallium is converted to automake.
+default: all