video/out/gpu: Add a `storable` flag to ra_format

While `ra` supports the concept of a texture as a storage
destination, it does not support the concept of a texture format
being usable for a storage texture. This can lead to us attempting
to create a texture from an incompatible format, with undefined
results.

So, let's introduce an explicit format flag for storage and use
it. In `ra_pl` we can simply reflect the `storable` flag. For
GL and D3D, we'll need to write some new code to do the compatibility
checks. I'm not going to do it here because it's not a regression;
we were already implicitly assuming all formats were storable.

Fixes #6657

1 files changed, 1 insertions, 0 deletions

diff --git a/video/out/placebo/ra_pl.c b/video/out/placebo/ra_pl.c
index 18d8f37070..28d4297f6f 100644
--- a/video/out/placebo/ra_pl.c
+++ b/video/out/placebo/ra_pl.c
@@ -88,6 +88,7 @@ struct ra *ra_create_pl(const struct pl_gpu *gpu, struct mp_log *log)
             .pixel_size = plfmt->texel_size,
             .linear_filter = plfmt->caps & PL_FMT_CAP_LINEAR,
             .renderable = plfmt->caps & PL_FMT_CAP_RENDERABLE,
+            .storable = plfmt->caps & PL_FMT_CAP_STORABLE,
             .glsl_format = plfmt->glsl_format,
         };