configure/swr: configurable swr architectures

Allow configuration of the SWR architecture depend libraries
we build for with --with-swr-archs.  Maintains current behavior
by defaulting to avx,avx2.

Scons changes made to make it still build and work, but
without the changes for configuring which architectures.

v2:
 * add missing comma for swr_archs default
 * check that at least one architecture is enabled
 * modify loader logic to make it clearer how to add archs

Reviewed-by: Emil Velikov <[email protected]>

1 files changed, 23 insertions, 7 deletions

diff --git a/src/gallium/drivers/swr/swr_loader.cpp b/src/gallium/drivers/swr/swr_loader.cpp
index d56fb0e59fb..4aa850a6b8d 100644
--- a/src/gallium/drivers/swr/swr_loader.cpp
+++ b/src/gallium/drivers/swr/swr_loader.cpp
@@ -31,22 +31,38 @@
 struct pipe_screen *
 swr_create_screen(struct sw_winsys *winsys)
 {
-   char filename[256];
+   char filename[256] = { 0 };
    fprintf(stderr, "SWR detected ");
 
    util_dl_library *pLibrary = nullptr;
 
    util_cpu_detect();
-   if (util_cpu_caps.has_avx2) {
-      fprintf(stderr, "AVX2\n");
+
+   if (!strlen(filename) && util_cpu_caps.has_avx2) {
+#if HAVE_SWR_AVX2
+      fprintf(stderr, "AVX2 ");
       sprintf(filename, "%s%s%s", UTIL_DL_PREFIX, "swrAVX2", UTIL_DL_EXT);
-   } else if (util_cpu_caps.has_avx) {
-      fprintf(stderr, "AVX\n");
+#else
+      fprintf(stderr, "AVX2 (not built) ");
+#endif
+   }
+
+   if (!strlen(filename) && util_cpu_caps.has_avx) {
+#if HAVE_SWR_AVX
+      fprintf(stderr, "AVX ");
       sprintf(filename, "%s%s%s", UTIL_DL_PREFIX, "swrAVX", UTIL_DL_EXT);
-   } else {
-      fprintf(stderr, "no AVX/AVX2 support.  Aborting!\n");
+#else
+      fprintf(stderr, "AVX (not built) ");
+#endif
+   }
+
+   if (!strlen(filename)) {
+      fprintf(stderr, "- no appropriate swr architecture library.  Aborting!\n");
       exit(-1);
+   } else {
+      fprintf(stderr, "\n");
    }
+
    pLibrary = util_dl_open(filename);
 
    if (!pLibrary) {