swr: (autoconf) allow a single swr architecture to be builtin

Part 1 of 2 (part 1 is autoconf changes, part 2 is C++ changes)

When only a single SWR architecture is being used, this allows that
architecture to be builtin rather than as a separate libswrARCH.so that
gets loaded via dlopen.  Since there are now several different code
paths for each detected CPU architecture, the log output is also
adjusted to convey where the backend is getting loaded from.

This allows SWR to be used for static mesa builds which are still
important for large HPC environments where shared libraries can impose
unacceptable application startup times as hundreds of thousands of copies
of the libs are loaded from a shared parallel filesystem.

Based on an initial implementation by Tim Rowley.

v2: Fix comment placement pointed out by Bruce C.

Signed-off-by: Chuck Atkins <[email protected]>
Reviewed-by: Bruce Cherniak <[email protected]>
CC: Tim Rowley <[email protected]>
Reviewed-by: Bruce Cherniak <[email protected]>

2 files changed, 50 insertions, 12 deletions

diff --git a/configure.ac b/configure.ac
index e236a3c54f6..7c1fbe0ed10 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2640,6 +2640,11 @@ if test -n "$with_gallium_drivers"; then
                AC_MSG_ERROR([swr enabled but no swr architectures selected])
             fi
 
+            # test if more than one swr arch configured
+            if test `echo $swr_archs | wc -w` -eq 1; then
+                HAVE_SWR_BUILTIN=yes
+            fi
+
             HAVE_GALLIUM_SWR=yes
             ;;
         xvc4)
@@ -2689,6 +2694,7 @@ AM_CONDITIONAL(HAVE_SWR_AVX, test "x$HAVE_SWR_AVX" = xyes)
 AM_CONDITIONAL(HAVE_SWR_AVX2, test "x$HAVE_SWR_AVX2" = xyes)
 AM_CONDITIONAL(HAVE_SWR_KNL, test "x$HAVE_SWR_KNL" = xyes)
 AM_CONDITIONAL(HAVE_SWR_SKX, test "x$HAVE_SWR_SKX" = xyes)
+AM_CONDITIONAL(HAVE_SWR_BUILTIN, test "x$HAVE_SWR_BUILTIN" = xyes)
 
 dnl We need to validate some needed dependencies for renderonly drivers.
 
@@ -3153,7 +3159,11 @@ fi
 
 echo ""
 if test "x$HAVE_GALLIUM_SWR" != x; then
-    echo "        SWR archs:       $swr_archs"
+    if test "x$HAVE_SWR_BUILTIN" = xyes; then
+        echo "        SWR archs:       $swr_archs (builtin)"
+    else
+        echo "        SWR archs:       $swr_archs"
+    fi
 fi
 
 dnl Libraries
diff --git a/src/gallium/drivers/swr/Makefile.am b/src/gallium/drivers/swr/Makefile.am
index c995f1b84a1..ace4e1d4e46 100644
--- a/src/gallium/drivers/swr/Makefile.am
+++ b/src/gallium/drivers/swr/Makefile.am
@@ -26,13 +26,9 @@ AM_CXXFLAGS = $(GALLIUM_DRIVER_CFLAGS) $(CXX11_CXXFLAGS)
 
 noinst_LTLIBRARIES = libmesaswr.la
 
-# gen_knobs.* included here to provide driver access to swr configuration
 libmesaswr_la_SOURCES = \
 	$(CXX_SOURCES) \
-	$(COMMON_CXX_SOURCES) \
 	$(JITTER_CXX_SOURCES) \
-	rasterizer/codegen/gen_knobs.cpp \
-	rasterizer/codegen/gen_knobs.h \
 	$(LOADER_SOURCES)
 
 COMMON_CXXFLAGS = \
@@ -243,8 +239,6 @@ COMMON_LDFLAGS = \
 lib_LTLIBRARIES =
 
 if HAVE_SWR_AVX
-lib_LTLIBRARIES += libswrAVX.la
-
 libswrAVX_la_CXXFLAGS = \
 	$(PTHREAD_CFLAGS) \
 	$(SWR_AVX_CXXFLAGS) \
@@ -262,7 +256,6 @@ libswrAVX_la_LDFLAGS = \
 endif
 
 if HAVE_SWR_AVX2
-lib_LTLIBRARIES += libswrAVX2.la
 libswrAVX2_la_CXXFLAGS = \
 	$(PTHREAD_CFLAGS) \
 	$(SWR_AVX2_CXXFLAGS) \
@@ -280,8 +273,6 @@ libswrAVX2_la_LDFLAGS = \
 endif
 
 if HAVE_SWR_KNL
-lib_LTLIBRARIES += libswrKNL.la
-
 libswrKNL_la_CXXFLAGS = \
 	$(PTHREAD_CFLAGS) \
 	$(SWR_KNL_CXXFLAGS) \
@@ -299,8 +290,6 @@ libswrKNL_la_LDFLAGS = \
 endif
 
 if HAVE_SWR_SKX
-lib_LTLIBRARIES += libswrSKX.la
-
 libswrSKX_la_CXXFLAGS = \
 	$(PTHREAD_CFLAGS) \
 	$(SWR_SKX_CXXFLAGS) \
@@ -317,6 +306,45 @@ libswrSKX_la_LDFLAGS = \
 	$(COMMON_LDFLAGS)
 endif
 
+if HAVE_SWR_BUILTIN
+libmesaswr_la_CXXFLAGS += -DHAVE_SWR_BUILTIN
+libmesaswr_la_LIBADD =
+if HAVE_SWR_AVX
+noinst_LTLIBRARIES += libswrAVX.la
+libmesaswr_la_LIBADD += libswrAVX.la
+endif
+if HAVE_SWR_AVX2
+noinst_LTLIBRARIES += libswrAVX2.la
+libmesaswr_la_LIBADD += libswrAVX2.la
+endif
+if HAVE_SWR_KNL
+noinst_LTLIBRARIES += libswrKNL.la
+libmesaswr_la_LIBADD += libswrKNL.la
+endif
+if HAVE_SWR_SKX
+noinst_LTLIBRARIES += libswrSKX.la
+libmesaswr_la_LIBADD += libswrSKX.la
+endif
+else # !HAVE_SWR_BUILTIN
+# gen_knobs.* included here to provide driver access to swr configuration
+libmesaswr_la_SOURCES += \
+       $(COMMON_CXX_SOURCES) \
+       rasterizer/codegen/gen_knobs.cpp \
+       rasterizer/codegen/gen_knobs.h
+if HAVE_SWR_AVX
+lib_LTLIBRARIES += libswrAVX.la
+endif
+if HAVE_SWR_AVX2
+lib_LTLIBRARIES += libswrAVX2.la
+endif
+if HAVE_SWR_KNL
+lib_LTLIBRARIES += libswrKNL.la
+endif
+if HAVE_SWR_SKX
+lib_LTLIBRARIES += libswrSKX.la
+endif
+endif
+
 include $(top_srcdir)/install-gallium-links.mk
 
 # Generated gen_builder.hpp is not backwards compatible. So ship only one