[FFmpeg-devel] [PATCH] hwcontext_vulkan: use VkPhysicalDeviceTimelineSemaphoreFeatures to check for timeline semaphore supporting

[Zhao Zhili]

VkPhysicalDeviceVulkan12Features isn't implemented on MoltenVK yet.
VkPhysicalDeviceTimelineSemaphoreFeatures is less versatile but
simple. None of device_features_1_1 nor device_features_1_2 has real
usage yet, keep the code for future.
---
 libavutil/hwcontext_vulkan.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/libavutil/hwcontext_vulkan.c b/libavutil/hwcontext_vulkan.c
index ae19fc2ab6..2e219511c9 100644
--- a/libavutil/hwcontext_vulkan.c
+++ b/libavutil/hwcontext_vulkan.c
@@ -1321,8 +1321,16 @@ static int vulkan_device_create_internal(AVHWDeviceContext *ctx,
     VulkanDevicePriv *p = ctx->internal->priv;
     FFVulkanFunctions *vk = &p->vkfn;
     AVVulkanDeviceContext *hwctx = ctx->hwctx;
+    /* VkPhysicalDeviceVulkan12Features has a timelineSemaphore field, but
+     * MoltenVK doesn't implement VkPhysicalDeviceVulkan12Features yet, so we
+     * use VkPhysicalDeviceTimelineSemaphoreFeatures directly.
+     */
+    VkPhysicalDeviceTimelineSemaphoreFeatures timeline_features = {
+        .sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_TIMELINE_SEMAPHORE_FEATURES,
+    };
     VkPhysicalDeviceVulkan12Features dev_features_1_2 = {
         .sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_VULKAN_1_2_FEATURES,
+        .pNext = &timeline_features,
     };
     VkPhysicalDeviceVulkan11Features dev_features_1_1 = {
         .sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_VULKAN_1_1_FEATURES,
@@ -1366,7 +1374,7 @@ static int vulkan_device_create_internal(AVHWDeviceContext *ctx,
 #undef COPY_FEATURE
 
     /* We require timeline semaphores */
-    if (!dev_features_1_2.timelineSemaphore) {
+    if (!timeline_features.timelineSemaphore) {
         av_log(ctx, AV_LOG_ERROR, "Device does not support timeline semaphores!\n");
         err = AVERROR(ENOSYS);
         goto end;
-- 
2.31.1