[Mesa-dev] [PATCH v3 12/15] gallium: introduce format modifier querying

[Varad Gautam]

From: Varad Gautam <varad.gautam at collabora.com>

format modifiers tokens are driver specific, and hence, need to come
in from the driver. this allows drivers to be queried for supported
format modifiers for EGL_EXT_image_dma_buf_import_modifiers.

v2: rebase to master.
v3: drivers must return false on query failure.
v4: use pscreen->is_format_supported instead of adding a separate
    format query handle, remove PIPE_CAP_QUERY_DMABUF_ATTRIBS.
    (Lucas Stach)

Signed-off-by: Varad Gautam <varad.gautam at collabora.com>
---
 src/gallium/include/pipe/p_screen.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/gallium/include/pipe/p_screen.h b/src/gallium/include/pipe/p_screen.h
index 8b4239c..276d126 100644
--- a/src/gallium/include/pipe/p_screen.h
+++ b/src/gallium/include/pipe/p_screen.h
@@ -328,6 +328,17 @@ struct pipe_screen {
     * driver doesn't support an on-disk shader cache.
     */
    struct disk_cache *(*get_disk_shader_cache)(struct pipe_screen *screen);
+
+   /**
+    * Get supported modifiers for a format.
+    * If \p max is 0, the total number of supported modifiers for the supplied
+    * format is returned in \p count, with no modification to \p modifiers.
+    * Otherwise, \p modifiers is filled with upto \p max supported modifier
+    * codes, and \p count with the number of modifiers copied.
+    */
+   void (*query_dmabuf_modifiers)(struct pipe_screen *screen,
+                                     enum pipe_format format, int max,
+                                     uint64_t *modifiers, int *count);
 };
 
 
-- 
2.10.0