hwcontext_vulkan: dlopen libvulkan

While Vulkan itself went more or less the way it was expected to go,
libvulkan didn't quite solve all of the opengl loader issues. It's multi-vendor,
yes, but unfortunately, the code is Google/Khronos QUALITY, so suffers from
big static linking issues (static linking on anything but OSX is unsupported),
has bugs, and due to the prefix system used, there are 3 or so ways to type out
functions.

Just solve all of those problems by dlopening it. We even have nice emulation
for it on Windows.

1 files changed, 33 insertions, 1 deletions

diff --git a/configure b/configure
index 820f719a32..23a0905819 100755
--- a/configure
+++ b/configure
@@ -1451,6 +1451,23 @@ test_pkg_config(){
         set_sanitized "${name}_extralibs" $pkg_libs
 }
 
+test_pkg_config_cpp(){
+    log test_pkg_config_cpp "$@"
+    name="$1"
+    pkg_version="$2"
+    pkg="${2%% *}"
+    headers="$3"
+    cond="$4"
+    shift 4
+    disable $name
+    test_cmd $pkg_config --exists --print-errors $pkg_version || return
+    pkg_cflags=$($pkg_config --cflags $pkg_config_flags $pkg)
+    pkg_incdir=$($pkg_config --variable=includedir $pkg_config_flags $pkg)
+    test_cpp_condition "$pkg_incdir/$headers" "$cond" "$@" &&
+        enable $name &&
+        set_sanitized "${name}_cflags" $pkg_cflags
+}
+
 check_pkg_config(){
     log check_pkg_config "$@"
     name="$1"
@@ -1458,6 +1475,13 @@ check_pkg_config(){
         eval add_cflags \$${name}_cflags
 }
 
+check_pkg_config_cpp(){
+    log check_pkg_config_cpp "$@"
+    name="$1"
+    test_pkg_config_cpp "$@" &&
+        eval add_cflags \$${name}_cflags
+}
+
 test_exec(){
     test_ld "cc" "$@" && { enabled cross_compile || $TMPE >> $logfile 2>&1; }
 }
@@ -1581,6 +1605,12 @@ require_pkg_config(){
     check_pkg_config "$@" || die "ERROR: $pkg_version not found using pkg-config$pkg_config_fail_message"
 }
 
+require_pkg_config_cpp(){
+    log require_pkg_config_cpp "$@"
+    pkg_version="$2"
+    check_pkg_config_cpp "$@" || die "ERROR: $pkg_version not found using pkg-config$pkg_config_fail_message"
+}
+
 test_host_cc(){
     log test_host_cc "$@"
     cat > $TMPC
@@ -2920,6 +2950,7 @@ nvdec_deps="ffnvcodec"
 vaapi_x11_deps="xlib"
 videotoolbox_hwaccel_deps="videotoolbox pthreads"
 videotoolbox_hwaccel_extralibs="-framework QuartzCore"
+vulkan_deps_any="libdl LoadLibrary"
 xvmc_deps="X11_extensions_XvMClib_h"
 
 av1_d3d11va_hwaccel_deps="d3d11va DXVA_PicParams_AV1"
@@ -6739,7 +6770,8 @@ enabled vdpau &&
 enabled crystalhd && check_lib crystalhd "stdint.h libcrystalhd/libcrystalhd_if.h" DtsCrystalHDVersion -lcrystalhd
 
 enabled vulkan &&
-    require_pkg_config vulkan "vulkan >= 1.1.97" "vulkan/vulkan.h" vkCreateInstance
+    { require_pkg_config_cpp vulkan "vulkan >= 1.1.97" "vulkan/vulkan.h" "defined VK_VERSION_1_1" ||
+      require_cpp_condition vulkan "vulkan/vulkan.h" "defined VK_VERSION_1_1"; }
 
 if enabled x86; then
     case $target_os in