Re: [FFmpeg-devel] [PATCH] lavu/vulkan: fix handle type for 32-bit targets

[Kacper Michajlow <kasper93@gmail.com>]

On Mon, 6 Mar 2023 at 10:00, Martin Storsjö <martin@martin.st> wrote:
>
> On Thu, 2 Mar 2023, Kacper Michajłow wrote:
>
> > Fixes compilation with clang which errors out on Wint-conversion.
> >
> > Signed-off-by: Kacper Michajłow <kasper93@gmail.com>
> > ---
> > libavutil/hwcontext_vulkan.c | 2 +-
> > libavutil/vulkan.h           | 4 ++++
> > 2 files changed, 5 insertions(+), 1 deletion(-)
>
> Minor context; it's only recent Clang that treats this issue as an error
> by default - iirc it changed sometime last year, so possibly since Clang
> 15 or so.
>
> >
> > diff --git a/libavutil/hwcontext_vulkan.c b/libavutil/hwcontext_vulkan.c
> > index 2a9b5f4aac..b3eccea7af 100644
> > --- a/libavutil/hwcontext_vulkan.c
> > +++ b/libavutil/hwcontext_vulkan.c
> > @@ -1149,7 +1149,7 @@ static void free_exec_ctx(AVHWFramesContext *hwfc, VulkanExecCtx *cmd)
> >
> >     av_freep(&cmd->queues);
> >     av_freep(&cmd->bufs);
> > -    cmd->pool = NULL;
> > +    cmd->pool = VK_NULL_HANDLE;
> > }
>
> This LGTM - I had run into the same issue and tried to fix this issue
> differently, but this looks better to me.
>
> > static VkCommandBuffer get_buf_exec_ctx(AVHWFramesContext *hwfc, VulkanExecCtx *cmd)
> > diff --git a/libavutil/vulkan.h b/libavutil/vulkan.h
> > index d1ea1e24fb..90922c6cf3 100644
> > --- a/libavutil/vulkan.h
> > +++ b/libavutil/vulkan.h
> > @@ -122,7 +122,11 @@ typedef struct FFVulkanPipeline {
> >     VkDescriptorSetLayout         *desc_layout;
> >     VkDescriptorPool               desc_pool;
> >     VkDescriptorSet               *desc_set;
> > +#if VK_USE_64_BIT_PTR_DEFINES == 1
> >     void                         **desc_staging;
> > +#else
> > +    uint64_t                      *desc_staging;
> > +#endif
> >     VkDescriptorSetLayoutBinding **desc_binding;
> >     VkDescriptorUpdateTemplate    *desc_template;
> >     int                           *desc_set_initialized;
> > --
> > 2.34.1
>
> What issue does this fix? I don't run into any errors relating to this,
> when building with Clang for Windows on i386 or armv7. I think the fix is
> correct though, the vulkan data types are a bit hard to get a grip of.

Indeed, by default `libavfilter/vulkan.c` is not built, even is vulkan
is enabled.
You can trigger it, with `--enable-libplacebo` for example.

It fixes those:

In file included from F:/dev/ffmpeg/libavfilter/vulk
an.c:19:
F:/dev/ffmpeg/libavutil/vulkan.c:1173:70: error: incompatible integer
to pointer conversion assigning to 'void *' from
'VkDescriptorSetLayout' (aka 'unsigned long long') [-Wint-conversion]
pl->desc_staging[spawn_pipeline_layout.setLayoutCount++] = pl->desc_layout[i];

F:/dev/ffmpeg/libavutil/vulkan.c:1272:29: error: incompatible integer
to pointer conversion assigning to 'void *' from 'VkDescriptorSet'
(aka 'unsigned long long') [-Wint-conversion]
pl->desc_staging[i] = pl->desc_set[i*pl->qf->nb_queues + pl->qf->cur_queue];

(sorry for double message)

-Kacper
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