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cogl/matrix: Scale using Graphene

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It sucks that we have to double transpose the matrix.
This commit is contained in:
Georges Basile Stavracas Neto 2019-02-27 17:30:08 -03:00
parent bb257868f3
commit ecee159113
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GPG Key ID: 886C17EE170D1385
1 changed files with 10 additions and 19 deletions
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29
cogl/cogl/cogl-matrix.c
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@ -555,31 +555,22 @@ cogl_matrix_orthographic (CoglMatrix *matrix,
_COGL_MATRIX_DEBUG_PRINT (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 void
cogl_matrix_scale (CoglMatrix *matrix, cogl_matrix_scale (CoglMatrix *matrix,
float sx, float sx,
float sy, float sy,
float sz) 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); _COGL_MATRIX_DEBUG_PRINT (matrix);
} }