[RFC xserver v4 13/14] glamor: Use gbm_bo_create_with_modifiers for internal pixmap allocation

[Louis-Francis Ratté-Boulianne]

Using modifier might allow the driver to use a more optimal format
(e.g. tiled/compressed). Let's try to use those if possible.

Signed-off-by: Louis-Francis Ratté-Boulianne <lfrb at collabora.com>
---
 glamor/glamor_egl.c           | 44 ++++++++++++++++++++++++++++++++++++++-----
 hw/xwayland/xwayland-glamor.c | 22 +++++++++++++++++++---
 2 files changed, 58 insertions(+), 8 deletions(-)

diff --git a/glamor/glamor_egl.c b/glamor/glamor_egl.c
index 4e60569a1..6626b577d 100644
--- a/glamor/glamor_egl.c
+++ b/glamor/glamor_egl.c
@@ -270,13 +270,47 @@ glamor_make_pixmap_exportable(PixmapPtr pixmap)
         return FALSE;
     }
 
-    bo = gbm_bo_create(glamor_egl->gbm, width, height,
-                       GBM_FORMAT_ARGB8888,
+#ifdef GBM_BO_WITH_MODIFIERS
+    if (glamor_egl->dmabuf_capable) {
+        uint32_t num_modifiers;
+        uint64_t *modifiers = NULL;
+        int i, j;
+
+        glamor_get_modifiers(screen, DRM_FORMAT_ARGB8888,
+                             &num_modifiers, &modifiers);
+
+        /* Filter out multi-plane modifiers */
+        for (i = num_modifiers - 1; i >= 0; i--) {
+            if (gbm_device_get_format_modifier_plane_count(glamor_egl->gbm,
+                                                           DRM_FORMAT_ARGB8888,
+                                                           modifiers[i]) == 1)
+                continue;
+            for (j = i + 1; j < num_modifiers; j++)
+                modifiers[j - 1] = modifiers[j];
+            num_modifiers--;
+        }
+        if (num_modifiers == 0 && modifiers) {
+            free(modifiers);
+            modifiers = NULL;
+        }
+
+        bo = gbm_bo_create_with_modifiers(glamor_egl->gbm, width, height,
+                                          GBM_FORMAT_ARGB8888,
+                                          modifiers, num_modifiers);
+        free(modifiers);
+    }
+    else
+#endif
+    {
+        bo = gbm_bo_create(glamor_egl->gbm, width, height,
+                GBM_FORMAT_ARGB8888,
 #ifdef GLAMOR_HAS_GBM_LINEAR
-                       (pixmap->usage_hint == CREATE_PIXMAP_USAGE_SHARED ?
-                        GBM_BO_USE_LINEAR : 0) |
+                (pixmap->usage_hint == CREATE_PIXMAP_USAGE_SHARED ?
+                 GBM_BO_USE_LINEAR : 0) |
 #endif
-                       GBM_BO_USE_RENDERING | GBM_BO_USE_SCANOUT);
+                GBM_BO_USE_RENDERING | GBM_BO_USE_SCANOUT);
+    }
+
     if (!bo) {
         xf86DrvMsg(scrn->scrnIndex, X_ERROR,
                    "Failed to make %dx%dx%dbpp GBM bo\n",
diff --git a/hw/xwayland/xwayland-glamor.c b/hw/xwayland/xwayland-glamor.c
index e3a7f6b5b..40772fb9a 100644
--- a/hw/xwayland/xwayland-glamor.c
+++ b/hw/xwayland/xwayland-glamor.c
@@ -226,14 +226,30 @@ xwl_glamor_create_pixmap(ScreenPtr screen,
 {
     struct xwl_screen *xwl_screen = xwl_screen_get(screen);
     struct gbm_bo *bo;
+    uint32_t format;
 
     if (width > 0 && height > 0 && depth >= 15 &&
         (hint == 0 ||
          hint == CREATE_PIXMAP_USAGE_BACKING_PIXMAP ||
          hint == CREATE_PIXMAP_USAGE_SHARED)) {
-        bo = gbm_bo_create(xwl_screen->gbm, width, height,
-                           gbm_format_for_depth(depth),
-                           GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING);
+        format = gbm_format_for_depth(depth);
+
+#ifdef GBM_BO_WITH_MODIFIERS
+        if (xwl_screen->dmabuf_capable) {
+            uint32_t num_modifiers;
+            uint64_t *modifiers = NULL;
+
+            glamor_get_modifiers(screen, format, &num_modifiers, &modifiers);
+            bo = gbm_bo_create_with_modifiers(xwl_screen->gbm, width, height,
+                                              format, modifiers, num_modifiers);
+            free(modifiers);
+        }
+        else
+#endif
+        {
+            bo = gbm_bo_create(xwl_screen->gbm, width, height, format,
+                               GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING);
+        }
 
         if (bo)
             return xwl_glamor_create_pixmap_for_bo(screen, bo, depth);
-- 
2.13.0