render/gles2: set has_alpha for DMA-BUFs
Use our internal pixel format table to figure out whether an
imported DMA-BUF has alpha.
@@ -248,11 +248,19 @@ static struct wlr_texture *gles2_texture_from_dmabuf(
if (texture == NULL) {
return NULL;
}
- texture->has_alpha = true;
texture->drm_format = DRM_FORMAT_INVALID; // texture can't be written anyways
texture->inverted_y =
(attribs->flags & WLR_DMABUF_ATTRIBUTES_FLAGS_Y_INVERT) != 0;
+ const struct wlr_pixel_format_info *drm_fmt =
+ drm_get_pixel_format_info(attribs->format);
+ if (drm_fmt != NULL) {
+ texture->has_alpha = drm_fmt->has_alpha;
+ } else {
+ // We don't know, assume the texture has an alpha channel
+ texture->has_alpha = true;
+ }
+
struct wlr_egl_context prev_ctx;
wlr_egl_save_context(&prev_ctx);
wlr_egl_make_current(renderer->egl);
