zink: add format test

This will help avoid future mistakes when mapping formats.

Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7982>

src/gallium/drivers/zink/meson.build

@@ -82,3 +82,16 @@ driver_zink = declare_dependency(
   compile_args : '-DGALLIUM_ZINK',
   link_with : [libzink],
 )
+
+if with_tests
+  test(
+    'zink_format_test',
+    executable(
+      'zink_format_test',
+      ['zink_format_test.c', 'zink_format.c'],
+      dependencies : [idep_mesautil, idep_vulkan_util],
+      include_directories : [inc_gallium, inc_gallium_aux, inc_include, inc_src],
+    ),
+    suite : ['zink'],
+  )
+endif

src/gallium/drivers/zink/zink_format_test.c

@@ -0,0 +1,27 @@
+#include "zink_format.h"
+#include "vk_format.h"
+
+int
+main(int argc, char *argv[])
+{
+   int ret = 0;
+   for (int i = 0; i < PIPE_FORMAT_COUNT; ++i) {
+      enum pipe_format pipe_fmt = i;
+      VkFormat vk_fmt = zink_pipe_format_to_vk_format(i);
+
+      /* skip unsupported formats */
+      if (vk_fmt == VK_FORMAT_UNDEFINED)
+         continue;
+
+      enum pipe_format roundtrip = vk_format_to_pipe_format(vk_fmt);
+      if (roundtrip != pipe_fmt) {
+         fprintf(stderr, "Format does not roundtrip\n"
+                         "\tgot: %s\n"
+                         "\texpected: %s\n",
+                         util_format_name(roundtrip),
+                         util_format_name(pipe_fmt));
+         ret = 1;
+      }
+   }
+   return ret;
+}