gallium: new raw gallium interface to support standalone tests

Provides basic window system integration behind a simple interface,
allowing tests to be written without dependency on either the driver
or window system.

With a lot of work, could turn into something like glut for gallium.

4 files changed, 124 insertions, 0 deletions

diff --git a/src/gallium/drivers/sw/Makefile b/src/gallium/drivers/sw/Makefile
new file mode 100644
index 00000000000..2713a62ee9f
--- /dev/null
+++ b/src/gallium/drivers/sw/Makefile
@@ -0,0 +1,10 @@
+# Meta-driver which combines whichever software rasterizers have been
+# built into a single convenience library.
+
+TOP = ../../../..
+include $(TOP)/configs/current
+
+C_SOURCES = \
+	sw.c
+
+include ../../Makefile.template
diff --git a/src/gallium/drivers/sw/SConscript b/src/gallium/drivers/sw/SConscript
new file mode 100644
index 00000000000..6fbbdf3cc46
--- /dev/null
+++ b/src/gallium/drivers/sw/SConscript
@@ -0,0 +1,42 @@
+#######################################################################
+# SConscript for swrast convenience library
+#
+# This is a meta-driver which consists of any and all of the software
+# rasterizers into a single driver.  A software rasterizer is defined
+# as any driver which takes an sw_winsys pointer as the only argument
+# to create_screen.
+#
+# XXX: unfortunately users of this driver still need to link in any
+# extra libraries needed for the particular driver (eg llvm for
+# llvmpipe).  Not sure how to get around this.
+
+Import('*')
+
+if not set(('softpipe', 'llvmpipe', 'cell')).intersection(env['drivers']):
+    print 'warning: no supported pipe driver: skipping build of sw meta-driver'
+    Return()
+
+env = env.Clone()
+
+if 'softpipe' in env['drivers']:
+    env.Append(CPPDEFINES = 'GALLIUM_SOFTPIPE')
+    env.Prepend(LIBS = [softpipe])
+
+if 'llvmpipe' in env['drivers']:
+    env.Tool('llvm')
+    if 'LLVM_VERSION' in env:
+        env.Append(CPPDEFINES = 'GALLIUM_LLVMPIPE')
+        env.Tool('udis86')
+        env.Prepend(LIBS = [llvmpipe])
+    
+if 'cell' in env['drivers']:
+    env.Append(CPPDEFINES = 'GALLIUM_CELL')
+    env.Prepend(LIBS = [cell])
+
+sw = env.ConvenienceLibrary(
+	target = 'sw',
+	source = [
+		'sw.c',
+		]
+    )
+    Export('sw')
diff --git a/src/gallium/drivers/sw/sw.c b/src/gallium/drivers/sw/sw.c
new file mode 100644
index 00000000000..9f156df45f5
--- /dev/null
+++ b/src/gallium/drivers/sw/sw.c
@@ -0,0 +1,59 @@
+#include "pipe/p_compiler.h"
+#include "util/u_debug.h"
+#include "target-helpers/wrap_screen.h"
+#include "sw_public.h"
+#include "state_tracker/sw_winsys.h"
+
+
+/* Helper function to choose and instantiate one of the software rasterizers:
+ * cell, llvmpipe, softpipe.
+ */
+
+#ifdef GALLIUM_SOFTPIPE
+#include "softpipe/sp_public.h"
+#endif
+
+#ifdef GALLIUM_LLVMPIPE
+#include "llvmpipe/lp_public.h"
+#endif
+
+#ifdef GALLIUM_CELL
+#include "cell/ppu/cell_public.h"
+#endif
+
+struct pipe_screen *
+swrast_create_screen(struct sw_winsys *winsys)
+{
+   const char *default_driver;
+   const char *driver;
+   struct pipe_screen *screen = NULL;
+
+#if defined(GALLIUM_CELL)
+   default_driver = "cell";
+#elif 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);
+
+#if defined(GALLIUM_CELL)
+   if (screen == NULL && strcmp(driver, "cell") == 0)
+      screen = cell_create_screen( winsys );
+#endif
+
+#if defined(GALLIUM_LLVMPIPE)
+   if (screen == NULL && strcmp(driver, "llvmpipe") == 0)
+      screen = llvmpipe_create_screen( winsys );
+#endif
+
+#if defined(GALLIUM_SOFTPIPE)
+   if (screen == NULL)
+      screen = softpipe_create_screen( winsys );
+#endif
+
+   return screen;
+}
diff --git a/src/gallium/drivers/sw/sw_public.h b/src/gallium/drivers/sw/sw_public.h
new file mode 100644
index 00000000000..7085c5c85a0
--- /dev/null
+++ b/src/gallium/drivers/sw/sw_public.h
@@ -0,0 +1,13 @@
+#ifndef SW_PUBLIC_H
+#define SW_PUBLIC_H
+
+/* A convenience library, primarily to isolate the logic required to
+ * figure out which if any software rasterizers have been built and
+ * select between them.
+ */
+struct sw_winsys;
+
+struct pipe_screen *
+swrast_create_screen(struct sw_winsys *winsys);
+
+#endif