gallium/noop: no operation gallium driver

This driver is a fake swdri driver that perform no operations
beside allocation gallium structure and buffer for upper layer
usage.

It's purpose is to help profiling core mesa/gallium without
having pipe driver overhead hidding hot spot of core code.

scons file are likely inadequate i am unfamiliar with this
build system.

To use it simply rename is to swrast_dri.so and properly set
LIBGL_DRIVERS_PATH env variable.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/src/gallium/targets/dri-noop/SConscript b/src/gallium/targets/dri-noop/SConscript
new file mode 100644
index 0000000000..9c04ee6631
--- /dev/null
+++ b/src/gallium/targets/dri-noop/SConscript
@@ -0,0 +1,31 @@
+Import('*')
+
+env = drienv.Clone()
+
+env.Append(CPPPATH = [
+    '#/src/gallium/winsys/sw/dri',
+])
+
+env.Prepend(LIBS = [
+    st_drisw,
+    ws_dri,
+    noop,
+    mesa,
+    glsl,
+    gallium,
+    COMMON_DRI_SW_OBJECTS
+])
+
+env.Prepend(LIBS = [noop])
+
+swrastg_sources = [
+    'swrast_drm_api.c'
+]
+
+module = env.LoadableModule(
+    target ='noop_dri.so',
+    source = swrastg_sources,
+    SHLIBPREFIX = '',
+)
+
+env.Alias('dri-noop', module)