void
rut_transform_quaternion_rotate (RutTransform *transform,
const CoglQuaternion *quaternion)
{
CoglMatrix rotation;
cogl_matrix_init_from_quaternion (&rotation, quaternion);
cogl_matrix_multiply (&transform->matrix, &transform->matrix, &rotation);
}
void
test_euler_quaternion (void)
{
CoglEuler euler;
CoglQuaternion quaternion;
CoglMatrix matrix_a, matrix_b;
/* Try doing the rotation with three separate rotations */
cogl_matrix_init_identity (&matrix_a);
cogl_matrix_rotate (&matrix_a, -30.0f, 0.0f, 1.0f, 0.0f);
cogl_matrix_rotate (&matrix_a, 40.0f, 1.0f, 0.0f, 0.0f);
cogl_matrix_rotate (&matrix_a, 50.0f, 0.0f, 0.0f, 1.0f);
/* And try the same rotation with a euler */
cogl_euler_init (&euler, -30, 40, 50);
cogl_matrix_init_from_euler (&matrix_b, &euler);
/* Verify that the matrices are approximately the same */
COMPARE_MATRICES (&matrix_a, &matrix_b);
/* Try converting the euler to a matrix via a quaternion */
cogl_quaternion_init_from_euler (&quaternion, &euler);
memset (&matrix_b, 0, sizeof (matrix_b));
cogl_matrix_init_from_quaternion (&matrix_b, &quaternion);
COMPARE_MATRICES (&matrix_a, &matrix_b);
/* Try applying the rotation from a euler to a framebuffer */
cogl_framebuffer_identity_matrix (test_fb);
cogl_framebuffer_rotate_euler (test_fb, &euler);
memset (&matrix_b, 0, sizeof (matrix_b));
cogl_framebuffer_get_modelview_matrix (test_fb, &matrix_b);
COMPARE_MATRICES (&matrix_a, &matrix_b);
/* And again with a quaternion */
cogl_framebuffer_identity_matrix (test_fb);
cogl_framebuffer_rotate_quaternion (test_fb, &quaternion);
memset (&matrix_b, 0, sizeof (matrix_b));
cogl_framebuffer_get_modelview_matrix (test_fb, &matrix_b);
COMPARE_MATRICES (&matrix_a, &matrix_b);
/* FIXME: This needs a lot more tests! */
if (cogl_test_verbose ())
g_print ("OK\n");
}
