[PATCH vkd3d 4/5] build: Check VK_HEADER_VERSION.

[Józef Kucia]

From: Józef Kucia <jkucia at codeweavers.com>

Signed-off-by: Józef Kucia <jkucia at codeweavers.com>
---
 configure.ac |  3 +++
 m4/vulkan.m4 | 19 +++++++++++++++++++
 2 files changed, 22 insertions(+)
 create mode 100644 m4/vulkan.m4

diff --git a/configure.ac b/configure.ac
index 58672c510ab9..618b8c098876 100644
--- a/configure.ac
+++ b/configure.ac
@@ -61,6 +61,9 @@ AS_IF([test "x$ac_cv_header_spirv_unified1_GLSL_std_450_h" != "xyes" \
        -a "x$ac_cv_header_vulkan_GLSL_std_450_h" != "xyes"],
       [AC_MSG_ERROR([GLSL.std.450.h not found.])])
 
+VKD3D_CHECK_VULKAN_HEADER_VERSION
+AS_IF([test "$vkd3d_cv_vk_header_version" -lt 84], [AC_MSG_ERROR([Vulkan headers are too old, 1.1.84 is required.])])
+
 dnl Check for libraries
 m4_ifdef([PKG_PROG_PKG_CONFIG], [PKG_PROG_PKG_CONFIG], [m4_fatal([pkg-config autoconf macros not found.])])
 
diff --git a/m4/vulkan.m4 b/m4/vulkan.m4
new file mode 100644
index 000000000000..088be7d5faae
--- /dev/null
+++ b/m4/vulkan.m4
@@ -0,0 +1,19 @@
+dnl VKD3D_CHECK_VULKAN_HEADER_VERSION
+AC_DEFUN([VKD3D_CHECK_VULKAN_HEADER_VERSION],
+
+[AS_VAR_PUSHDEF([vkd3d_vk_version], vkd3d_cv_vk_header_version)
+AC_CACHE_CHECK([VK_HEADER_VERSION], vkd3d_vk_version,
+               [AC_RUN_IFELSE(
+               [AC_LANG_SOURCE([#include <stdio.h>
+                               #include <vulkan/vulkan.h>
+                               int main(void)
+                               {
+                                   FILE *f = fopen("conftest.out", "wb");
+                                   if (!f) return 1;
+                                   fprintf(f, "%u", VK_HEADER_VERSION);
+                                   fclose(f);
+                                   return 0;
+                               }])],
+               [AS_VAR_SET([vkd3d_vk_version], [`cat conftest.out`])],
+               [AS_VAR_SET([vkd3d_vk_version], [0])])])
+AS_VAR_POPDEF([vkd3d_vk_version])])
-- 
2.18.1