dmabuf: set modifier to invalid for not supporting clients

modifier_hi and modifier_lo are set to 0 by clients,
which are not supporting modifiers. Modifier attributes
of buffers of these clients set to 0 too in linux-dmabuf.c

import_simple_dmabuf function in gl-renderer.c compares
modifier attribute of the buffer with DRM_FORMAT_MOD_INVALID.
DRM_FORMAT_MOD_INVALID is equal to ((1ULL<<56) - 1).
Therefore, modifer 0 is accepted as valid. Then, the function
checks support for eglQueryDmaBufModifiersEXT.
If it is not supported import_simple_dmabuf function is returning
NULL.

This patch sets the modifier attribute to DRM_FORMAT_MOD_INVALID
for clients which are not supporting modifiers. Without this patch
linux-dmabuf protocol is not working for not supporting clients.

Fixes: b138d7afb3 ("gl-renderer: Ignore INVALID modifier")
Signed-off-by: Emre Ucan <eucan@de.adit-jv.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Tested-by: Tomohito Esaki <etom@igel.co.jp>

libweston/gl-renderer.c

@@ -2164,7 +2164,7 @@ gl_renderer_import_dmabuf(struct weston_compositor *ec,
 
 	for (i = 0; i < dmabuf->attributes.n_planes; i++) {
 		/* return if EGL doesn't support import modifiers */
-		if (dmabuf->attributes.modifier[i] != 0)
+		if (dmabuf->attributes.modifier[i] != DRM_FORMAT_MOD_INVALID)
 			if (!gr->has_dmabuf_import_modifiers)
 				return false;
 

libweston/linux-dmabuf.c

@@ -111,8 +111,13 @@ params_add(struct wl_client *client,
 	buffer->attributes.fd[plane_idx] = name_fd;
 	buffer->attributes.offset[plane_idx] = offset;
 	buffer->attributes.stride[plane_idx] = stride;
-	buffer->attributes.modifier[plane_idx] = ((uint64_t)modifier_hi << 32) |
-	                                         modifier_lo;
+
+	if (wl_resource_get_version(params_resource) < ZWP_LINUX_DMABUF_V1_MODIFIER_SINCE_VERSION)
+		buffer->attributes.modifier[plane_idx] = DRM_FORMAT_MOD_INVALID;
+	else
+		buffer->attributes.modifier[plane_idx] = ((uint64_t)modifier_hi << 32) |
+							 modifier_lo;
+
 	buffer->attributes.n_planes++;
 }