hwcontext_vulkan: check if semaphores are exportable before enabling exporting

lavapipe recently added support for external_semaphore_fd, but only for syncfiles,
not for opaque file descriptors.

The code is written to allow using syncfiles later on.

Ref: https://gitlab.freedesktop.org/mesa/mesa/-/issues/12422

libavutil/hwcontext_vulkan.c

@@ -112,6 +112,9 @@ typedef struct VulkanDevicePriv {
     VkPhysicalDeviceMemoryProperties mprops;
     VkPhysicalDeviceExternalMemoryHostPropertiesEXT hprops;
 
+    /* Opaque FD external semaphore properties */
+    VkExternalSemaphoreProperties ext_sem_props_opaque;
+
     /* Enabled features */
     VulkanDeviceFeatures feats;
 
@@ -1715,6 +1718,7 @@ static int vulkan_device_init(AVHWDeviceContext *ctx)
     FFVulkanFunctions *vk = &p->vkctx.vkfn;
     VkQueueFamilyProperties2 *qf;
     VkQueueFamilyVideoPropertiesKHR *qf_vid;
+    VkPhysicalDeviceExternalSemaphoreInfo ext_sem_props_info;
     int graph_index, comp_index, tx_index, enc_index, dec_index;
 
     /* Set device extension flags */
@@ -1760,6 +1764,24 @@ static int vulkan_device_init(AVHWDeviceContext *ctx)
         return AVERROR_EXTERNAL;
     }
 
+    ext_sem_props_info = (VkPhysicalDeviceExternalSemaphoreInfo) {
+        .sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_EXTERNAL_SEMAPHORE_INFO,
+    };
+
+    /* Opaque FD semaphore properties */
+    ext_sem_props_info.handleType =
+#ifdef _WIN32
+        IsWindows8OrGreater()
+            ? VK_EXTERNAL_SEMAPHORE_HANDLE_TYPE_OPAQUE_WIN32_BIT
+            : VK_EXTERNAL_SEMAPHORE_HANDLE_TYPE_OPAQUE_WIN32_KMT_BIT;
+#else
+        VK_EXTERNAL_SEMAPHORE_HANDLE_TYPE_OPAQUE_FD_BIT;
+#endif
+    p->ext_sem_props_opaque.sType = VK_STRUCTURE_TYPE_EXTERNAL_SEMAPHORE_PROPERTIES;
+    vk->GetPhysicalDeviceExternalSemaphoreProperties(hwctx->phys_dev,
+                                                     &ext_sem_props_info,
+                                                     &p->ext_sem_props_opaque);
+
     qf = av_malloc_array(qf_num, sizeof(VkQueueFamilyProperties2));
     if (!qf)
         return AVERROR(ENOMEM);
@@ -2419,8 +2441,19 @@ static int create_frame(AVHWFramesContext *hwfc, AVVkFrame **frame,
     VulkanDevicePriv *p = ctx->hwctx;
     AVVulkanDeviceContext *hwctx = &p->p;
     FFVulkanFunctions *vk = &p->vkctx.vkfn;
+    AVVkFrame *f;
 
-    VkExportSemaphoreCreateInfo ext_sem_info = {
+    VkSemaphoreTypeCreateInfo sem_type_info = {
+        .sType         = VK_STRUCTURE_TYPE_SEMAPHORE_TYPE_CREATE_INFO,
+        .semaphoreType = VK_SEMAPHORE_TYPE_TIMELINE,
+        .initialValue  = 0,
+    };
+    VkSemaphoreCreateInfo sem_spawn = {
+        .sType = VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO,
+        .pNext = &sem_type_info,
+    };
+
+    VkExportSemaphoreCreateInfo ext_sem_info_opaque = {
         .sType = VK_STRUCTURE_TYPE_EXPORT_SEMAPHORE_CREATE_INFO,
 #ifdef _WIN32
         .handleTypes = IsWindows8OrGreater()
@@ -2431,23 +2464,13 @@ static int create_frame(AVHWFramesContext *hwfc, AVVkFrame **frame,
 #endif
     };
 
-    VkSemaphoreTypeCreateInfo sem_type_info = {
-        .sType         = VK_STRUCTURE_TYPE_SEMAPHORE_TYPE_CREATE_INFO,
-#ifdef _WIN32
-        .pNext         = p->vkctx.extensions & FF_VK_EXT_EXTERNAL_WIN32_SEM ? &ext_sem_info : NULL,
-#else
-        .pNext         = p->vkctx.extensions & FF_VK_EXT_EXTERNAL_FD_SEM ? &ext_sem_info : NULL,
-#endif
-        .semaphoreType = VK_SEMAPHORE_TYPE_TIMELINE,
-        .initialValue  = 0,
-    };
-
-    VkSemaphoreCreateInfo sem_spawn = {
-        .sType = VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO,
-        .pNext = &sem_type_info,
-    };
+    /* Check if exporting is supported before chaining any structs */
+    if (p->ext_sem_props_opaque.externalSemaphoreFeatures & VK_EXTERNAL_SEMAPHORE_FEATURE_EXPORTABLE_BIT) {
+        if (p->vkctx.extensions & (FF_VK_EXT_EXTERNAL_WIN32_SEM | FF_VK_EXT_EXTERNAL_FD_SEM))
+            ff_vk_link_struct(&sem_type_info, &ext_sem_info_opaque);
+    }
 
-    AVVkFrame *f = av_vk_frame_alloc();
+    f = av_vk_frame_alloc();
     if (!f) {
         av_log(ctx, AV_LOG_ERROR, "Unable to allocate memory for AVVkFrame!\n");
         return AVERROR(ENOMEM);

libavutil/vulkan_functions.h

@@ -35,10 +35,8 @@ typedef uint64_t FFVulkanExtensions;
 #define FF_VK_EXT_EXTERNAL_HOST_MEMORY   (1ULL <<  4) /* VK_EXT_external_memory_host */
 #define FF_VK_EXT_DEBUG_UTILS            (1ULL <<  5) /* VK_EXT_debug_utils */
 
-#ifdef _WIN32
 #define FF_VK_EXT_EXTERNAL_WIN32_MEMORY  (1ULL <<  6) /* VK_KHR_external_memory_win32 */
 #define FF_VK_EXT_EXTERNAL_WIN32_SEM     (1ULL <<  7) /* VK_KHR_external_semaphore_win32 */
-#endif
 
 #define FF_VK_EXT_DESCRIPTOR_BUFFER      (1ULL <<  8) /* VK_EXT_descriptor_buffer */
 #define FF_VK_EXT_DEVICE_DRM             (1ULL <<  9) /* VK_EXT_physical_device_drm */
@@ -82,6 +80,7 @@ typedef uint64_t FFVulkanExtensions;
     MACRO(1, 0, FF_VK_EXT_NO_FLAG,              CreateDevice)                            \
     MACRO(1, 0, FF_VK_EXT_NO_FLAG,              GetPhysicalDeviceFeatures2)              \
     MACRO(1, 0, FF_VK_EXT_NO_FLAG,              GetPhysicalDeviceProperties)             \
+    MACRO(1, 0, FF_VK_EXT_NO_FLAG,              GetPhysicalDeviceExternalSemaphoreProperties)          \
     MACRO(1, 0, FF_VK_EXT_VIDEO_QUEUE,          GetPhysicalDeviceVideoCapabilitiesKHR)     \
     MACRO(1, 0, FF_VK_EXT_VIDEO_QUEUE,          GetPhysicalDeviceVideoFormatPropertiesKHR) \
     MACRO(1, 0, FF_VK_EXT_NO_FLAG,              DeviceWaitIdle)                          \