[mutter/gbsneto/graphene-matrix: 34/50] clutter/offscreen-effect: Use graphene APIs

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 0f1aca57c8b6b1efd3c70801114e94a8dac631ca
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Fri Sep 11 16:34:59 2020 -0300

    clutter/offscreen-effect: Use graphene APIs
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1439

 clutter/clutter/clutter-offscreen-effect.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)
---
diff --git a/clutter/clutter/clutter-offscreen-effect.c b/clutter/clutter/clutter-offscreen-effect.c
index e4a9a45e5a..c76a973881 100644
--- a/clutter/clutter/clutter-offscreen-effect.c
+++ b/clutter/clutter/clutter-offscreen-effect.c
@@ -428,6 +428,7 @@ clutter_offscreen_effect_paint_texture (ClutterOffscreenEffect *effect,
   CoglFramebuffer *framebuffer =
     clutter_paint_context_get_framebuffer (paint_context);
   graphene_matrix_t modelview;
+  graphene_matrix_t m;
   float resource_scale;
 
   cogl_framebuffer_push_matrix (framebuffer);
@@ -442,13 +443,19 @@ clutter_offscreen_effect_paint_texture (ClutterOffscreenEffect *effect,
   if (resource_scale != 1.0f)
     {
       float paint_scale = 1.0f / resource_scale;
-      cogl_matrix_scale (&modelview, paint_scale, paint_scale, 1);
+      graphene_matrix_init_scale (&m, paint_scale, paint_scale, 1.f);
     }
+  else
+    {
+      graphene_matrix_init_identity (&m);
+    }
+
+  graphene_matrix_translate (&m,
+                             &GRAPHENE_POINT3D_INIT (priv->fbo_offset_x,
+                                                     priv->fbo_offset_y,
+                                                     0.0f));
+  graphene_matrix_multiply (&m, &modelview, &modelview);
 
-  cogl_matrix_translate (&modelview,
-                         priv->fbo_offset_x,
-                         priv->fbo_offset_y,
-                         0.0f);
   cogl_framebuffer_set_modelview_matrix (framebuffer, &modelview);
 
   /* paint the target material; this is virtualized for