[mutter/gbsneto/graphene2: 27/45] cogl/matrix: Scale using Graphene

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

commit ecee1591132cdb20e62e9841f1ec1547e1127e63
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Wed Feb 27 17:30:08 2019 -0300

    cogl/matrix: Scale using Graphene
    
    It sucks that we have to double transpose the matrix.

 cogl/cogl/cogl-matrix.c | 29 ++++++++++-------------------
 1 file changed, 10 insertions(+), 19 deletions(-)
---
diff --git a/cogl/cogl/cogl-matrix.c b/cogl/cogl/cogl-matrix.c
index 95139b22d..2c568c755 100644
--- a/cogl/cogl/cogl-matrix.c
+++ b/cogl/cogl/cogl-matrix.c
@@ -555,31 +555,22 @@ cogl_matrix_orthographic (CoglMatrix *matrix,
   _COGL_MATRIX_DEBUG_PRINT (matrix);
 }
 
-/*
- * Multiply a matrix with a general scaling matrix.
- *
- * Multiplies in-place the elements of matrix by the scale factors. Checks if
- * the scales factors are roughly the same, marking the MAT_FLAG_UNIFORM_SCALE
- * flag, or MAT_FLAG_GENERAL_SCALE. Marks the MAT_DIRTY_TYPE and
- * MAT_DIRTY_INVERSE dirty flags.
- */
-static void
-_cogl_matrix_scale (CoglMatrix *matrix, float x, float y, float z)
-{
-  float *m = (float *)matrix;
-  m[0] *= x;   m[4] *= y;   m[8]  *= z;
-  m[1] *= x;   m[5] *= y;   m[9]  *= z;
-  m[2] *= x;   m[6] *= y;   m[10] *= z;
-  m[3] *= x;   m[7] *= y;   m[11] *= z;
-}
-
 void
 cogl_matrix_scale (CoglMatrix *matrix,
                   float sx,
                   float sy,
                   float sz)
 {
-  _cogl_matrix_scale (matrix, sx, sy, sz);
+  graphene_matrix_t m;
+
+  cogl_matrix_to_graphene_matrix (matrix, &m);
+
+  graphene_matrix_transpose (&m, &m);
+  graphene_matrix_scale (&m, sx, sy, sz);
+  graphene_matrix_transpose (&m, &m);
+
+  graphene_matrix_to_cogl_matrix (&m, matrix);
+
   _COGL_MATRIX_DEBUG_PRINT (matrix);
 }