[FFmpeg-devel] [PATCH v2 02/12] vulkan: add ff_vk_create_imageview

[Lynne <dev@lynne.ee>]

---
 libavutil/vulkan.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++
 libavutil/vulkan.h |  7 +++++++
 2 files changed, 58 insertions(+)

diff --git a/libavutil/vulkan.c b/libavutil/vulkan.c
index 31610e2d94..de6260b2f8 100644
--- a/libavutil/vulkan.c
+++ b/libavutil/vulkan.c
@@ -1586,6 +1586,57 @@ static VkFormat map_fmt_to_rep(VkFormat fmt, enum FFVkShaderRepFormat rep_fmt)
     return VK_FORMAT_UNDEFINED;
 }
 
+int ff_vk_create_imageview(FFVulkanContext *s,
+                           VkImageView *img_view, VkImageAspectFlags *aspect,
+                           AVFrame *f, int plane, enum FFVkShaderRepFormat rep_fmt)
+{
+    VkResult ret;
+    FFVulkanFunctions *vk = &s->vkfn;
+    AVHWFramesContext *hwfc = (AVHWFramesContext *)f->hw_frames_ctx->data;
+    AVVulkanFramesContext *vkfc = hwfc->hwctx;
+    const VkFormat *rep_fmts = av_vkfmt_from_pixfmt(hwfc->sw_format);
+    AVVkFrame *vkf = (AVVkFrame *)f->data[0];
+    const int nb_images = ff_vk_count_images(vkf);
+
+    VkImageViewUsageCreateInfo view_usage_info = {
+        .sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_USAGE_CREATE_INFO,
+        .usage = vkfc->usage &
+                 (~(VK_IMAGE_USAGE_VIDEO_ENCODE_SRC_BIT_KHR |
+                    VK_IMAGE_USAGE_VIDEO_DECODE_DST_BIT_KHR)),
+    };
+    VkImageViewCreateInfo view_create_info = {
+        .sType      = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO,
+        .pNext      = &view_usage_info,
+        .image      = vkf->img[FFMIN(plane, nb_images - 1)],
+        .viewType   = VK_IMAGE_VIEW_TYPE_2D,
+        .format     = map_fmt_to_rep(rep_fmts[plane], rep_fmt),
+        .components = ff_comp_identity_map,
+        .subresourceRange = {
+            .aspectMask = ff_vk_aspect_flag(f, plane),
+            .levelCount = 1,
+            .layerCount = 1,
+        },
+    };
+    if (view_create_info.format == VK_FORMAT_UNDEFINED) {
+        av_log(s, AV_LOG_ERROR, "Unable to find a compatible representation "
+                                "of format %i and mode %i\n",
+               rep_fmts[plane], rep_fmt);
+        return AVERROR(EINVAL);
+    }
+
+    ret = vk->CreateImageView(s->hwctx->act_dev, &view_create_info,
+                              s->hwctx->alloc, img_view);
+    if (ret != VK_SUCCESS) {
+        av_log(s, AV_LOG_ERROR, "Failed to create imageview: %s\n",
+               ff_vk_ret2str(ret));
+        return AVERROR_EXTERNAL;
+    }
+
+    *aspect = view_create_info.subresourceRange.aspectMask;
+
+    return 0;
+}
+
 int ff_vk_create_imageviews(FFVulkanContext *s, FFVkExecContext *e,
                             VkImageView views[AV_NUM_DATA_POINTERS],
                             AVFrame *f, enum FFVkShaderRepFormat rep_fmt)
diff --git a/libavutil/vulkan.h b/libavutil/vulkan.h
index 8690c13b3d..c3ddf0cd6b 100644
--- a/libavutil/vulkan.h
+++ b/libavutil/vulkan.h
@@ -457,6 +457,13 @@ int ff_vk_exec_mirror_sem_value(FFVulkanContext *s, FFVkExecContext *e,
                                 AVFrame *f);
 void ff_vk_exec_discard_deps(FFVulkanContext *s, FFVkExecContext *e);
 
+/**
+ * Create a single imageview for a given plane.
+ */
+int ff_vk_create_imageview(FFVulkanContext *s,
+                           VkImageView *img_view, VkImageAspectFlags *aspect,
+                           AVFrame *f, int plane, enum FFVkShaderRepFormat rep_fmt);
+
 /**
  * Create an imageview and add it as a dependency to an execution.
  */
-- 
2.47.2
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