scons: Always build softpipe and llvmpipe (when llvm available).

These are our reference software rasterizers. They can build everywhere
and are a precious debugging tool.

Making them always present immensily simplifies the scons logic.

If people want to avoid building it is still possible to pass
direcotries and target names to scons to narrow the build.

SConstruct

@@ -102,11 +102,15 @@ Export([
 #######################################################################
 # Environment setup
 
-# Always build trace and identity drivers
+# Always build trace, identity, softpipe, and llvmpipe (where possible)
 if 'trace' not in env['drivers']:
     env['drivers'].append('trace')
 if 'identity' not in env['drivers']:
     env['drivers'].append('identity')
+if 'softpipe' not in env['drivers']:
+    env['drivers'].append('softpipe')
+if env['llvm'] and 'llvmpipe' not in env['drivers']:
+    env['drivers'].append('llvmpipe')
 
 # Includes
 env.Append(CPPPATH = [

src/gallium/drivers/sw/SConscript

@@ -12,17 +12,13 @@
 
 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']:
+if True:
     env.Append(CPPDEFINES = 'GALLIUM_SOFTPIPE')
     env.Prepend(LIBS = [softpipe])
 
-if 'llvmpipe' in env['drivers']:
+if env['llvm']:
     env.Append(CPPDEFINES = 'GALLIUM_LLVMPIPE')
     env.Tool('udis86')
     env.Prepend(LIBS = [llvmpipe])

src/gallium/state_trackers/python/SConscript

@@ -44,10 +44,10 @@ if 'python' in env['statetrackers']:
         gallium,
     ])
 
-    if 'llvmpipe' in env['drivers']:
+    if env['llvm']:
         env.Append(CPPDEFINES = ['HAVE_LLVMPIPE'])
         env.Prepend(LIBS = [llvmpipe])
-    if 'softpipe' in env['drivers']:
+    if True:
         env.Append(CPPDEFINES = ['HAVE_SOFTPIPE'])
         env.Prepend(LIBS = [softpipe])
 

src/gallium/targets/dri-swrast/SConscript

@@ -1,9 +1,5 @@
 Import('*')
 
-if not set(('softpipe', 'llvmpipe')).intersection(env['drivers']):
-    print 'warning: no supported pipe driver: skipping build of swrastg_dri.so'
-    Return()
-
 env = drienv.Clone()
 
 env.Append(CPPPATH = [
@@ -20,11 +16,11 @@ env.Prepend(LIBS = [
     COMMON_DRI_SW_OBJECTS
 ])
 
-if 'softpipe' in env['drivers']:
+if True:
     env.Append(CPPDEFINES = 'GALLIUM_SOFTPIPE')
     env.Prepend(LIBS = [softpipe])
 
-if 'llvmpipe' in env['drivers']:
+if env['llvm']:
     env.Append(CPPDEFINES = 'GALLIUM_LLVMPIPE')
     env.Tool('udis86')
     env.Prepend(LIBS = [llvmpipe])

src/gallium/targets/graw-xlib/SConscript

@@ -6,10 +6,6 @@ Import('*')
 if env['platform'] != 'linux':
     Return()
 
-if not set(('softpipe', 'llvmpipe', 'cell')).intersection(env['drivers']):
-    print 'warning: no supported pipe driver: skipping build of xlib libGL.so'
-    Return()
-
 env = env.Clone()
 
 env.Prepend(LIBS = [
@@ -28,11 +24,11 @@ sources = [
     'graw_xlib.c',
 ]
 
-if 'softpipe' in env['drivers']:
+if True:
     env.Append(CPPDEFINES = 'GALLIUM_SOFTPIPE')
     env.Prepend(LIBS = [softpipe])
 
-if 'llvmpipe' in env['drivers']:
+if env['llvm']:
     env.Append(CPPDEFINES = 'GALLIUM_LLVMPIPE')
     env.Tool('udis86')
     env.Prepend(LIBS = [llvmpipe])

src/gallium/targets/libgl-gdi/SConscript

@@ -22,18 +22,14 @@ if env['platform'] == 'windows':
     sources = []
     drivers = []
 
-    if 'softpipe' in env['drivers']:
+    if True:
         sources = ['gdi_softpipe_winsys.c']
         drivers = [softpipe]
 
-    if 'llvmpipe' in env['drivers']:
+    if env['llvm']:
         sources = ['gdi_llvmpipe_winsys.c']
         drivers = [llvmpipe]
 
-    if not sources or not drivers:
-        print 'warning: softpipe or llvmpipe not selected, gdi winsys disabled'
-        Return()
-    
     if env['gcc']:
         sources += ['#src/gallium/state_trackers/wgl/opengl32.mingw.def']
     else:

src/gallium/targets/libgl-xlib/SConscript

@@ -14,10 +14,6 @@ if env['dri']:
     print 'warning: DRI enabled: skipping build of xlib libGL.so'
     Return()
 
-if not set(('softpipe', 'llvmpipe', 'cell')).intersection(env['drivers']):
-    print 'warning: no supported pipe driver: skipping build of xlib libGL.so'
-    Return()
-
 env = env.Clone()
 
 env.Append(CPPPATH = [
@@ -45,11 +41,11 @@ sources = [
 
 env.Tool('x11')
 
-if 'softpipe' in env['drivers']:
+if True:
     env.Append(CPPDEFINES = 'GALLIUM_SOFTPIPE')
     env.Prepend(LIBS = [softpipe])
 
-if 'llvmpipe' in env['drivers']:
+if env['llvm']:
     env.Append(CPPDEFINES = 'GALLIUM_LLVMPIPE')
     env.Tool('udis86')
     env.Prepend(LIBS = [llvmpipe])