vrend: fix out_modifier default value

Unlike out_fourcc, where the default value 0 is DRM_FORMAT_INVALID, the
default value 0 for out_modifier is DRM_FORMAT_MOD_LINEAR.

This changes nothing in practice as the only user of
virgl_renderer_execute is crosvm, and crosvm takes the
ENABLE_MINIGBM_ALLOCATION path instead.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: Isaac Bosompem <mrisaacb@google.com>

src/vrend_renderer.c

@@ -10601,6 +10601,7 @@ int vrend_renderer_export_query(struct pipe_resource *pres,
     */
    export_query->out_num_fds = 0;
    export_query->out_fourcc = 0;
+   export_query->out_modifier = DRM_FORMAT_MOD_INVALID;
    if (export_query->in_export_fds)
       return -EINVAL;
 

src/vrend_winsys.h

@@ -34,6 +34,10 @@
 
 #include "virglrenderer.h"
 
+#ifndef DRM_FORMAT_MOD_INVALID
+#define DRM_FORMAT_MOD_INVALID 0x00ffffffffffffffULL
+#endif
+
 struct virgl_gl_ctx_param;
 
 #ifdef HAVE_EPOXY_EGL_H

src/vrend_winsys_gbm.c

@@ -38,6 +38,7 @@
 #include "util/u_memory.h"
 #include "pipe/p_state.h"
 
+#include "vrend_winsys.h"
 #include "vrend_winsys_gbm.h"
 #include "virgl_hw.h"
 #include "vrend_debug.h"
@@ -461,7 +462,7 @@ int virgl_gbm_export_query(struct gbm_bo *bo, struct virgl_renderer_export_query
 
    query->out_num_fds = 0;
    query->out_fourcc = 0;
-   query->out_modifier = 0;
+   query->out_modifier = DRM_FORMAT_MOD_INVALID;
    for (int plane = 0; plane < VIRGL_GBM_MAX_PLANES; plane++) {
       query->out_fds[plane] = -1;
       query->out_strides[plane] = 0;