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cogl/matrix: Scale using graphene matrices

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Boring.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1439
This commit is contained in:
Georges Basile Stavracas Neto 2020-09-10 10:47:39 -03:00
parent ade28eeaf3
commit 06db70ea28
1 changed files with 19 additions and 26 deletions
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45
cogl/cogl/cogl-matrix.c
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@ -1315,38 +1315,31 @@ 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;
if (fabsf (x - y) < 1e-8 && fabsf (x - z) < 1e-8)
matrix->flags |= MAT_FLAG_UNIFORM_SCALE;
else
matrix->flags |= MAT_FLAG_GENERAL_SCALE;
matrix->flags |= (MAT_DIRTY_TYPE | MAT_DIRTY_INVERSE);
}
void
cogl_matrix_scale (CoglMatrix *matrix,
float sx,
float sy,
float sz)
{
_cogl_matrix_scale (matrix, sx, sy, sz);
graphene_matrix_t scale;
graphene_matrix_t m;
unsigned long flags;
flags = matrix->flags;
cogl_matrix_to_graphene_matrix (matrix, &m);
graphene_matrix_init_scale (&scale, sx, sy, sz);
graphene_matrix_multiply (&scale, &m, &m);
graphene_matrix_to_cogl_matrix (&m, matrix);
if (fabsf (sx - sy) < 1e-8 && fabsf (sx - sz) < 1e-8)
flags |= MAT_FLAG_UNIFORM_SCALE;
else
flags |= MAT_FLAG_GENERAL_SCALE;
flags |= (MAT_DIRTY_TYPE | MAT_DIRTY_INVERSE);
matrix->flags = flags;
_COGL_MATRIX_DEBUG_PRINT (matrix);
}