static void
_rut_camera_flush_transforms (RutCamera *camera)
{
const CoglMatrix *projection;
CoglFramebuffer *fb = camera->fb;
CameraFlushState *state;
/* While a camera is in a suspended state then we don't expect to
* _flush() and use that camera before it is restored. */
g_return_if_fail (camera->suspended == FALSE);
state = cogl_object_get_user_data (COGL_OBJECT (fb), &fb_camera_key);
if (!state)
{
state = g_slice_new (CameraFlushState);
cogl_object_set_user_data (COGL_OBJECT (fb),
&fb_camera_key,
state,
free_camera_flush_state);
}
else if (state->current_camera == camera &&
camera->transform_age == state->transform_age)
goto done;
if (camera->in_frame)
{
g_warning ("Un-balanced rut_camera_flush/_end calls: "
"repeat _flush() calls before _end()");
}
cogl_framebuffer_set_viewport (fb,
camera->viewport[0],
camera->viewport[1],
camera->viewport[2],
camera->viewport[3]);
projection = rut_camera_get_projection (camera);
cogl_framebuffer_set_projection_matrix (fb, projection);
cogl_framebuffer_set_modelview_matrix (fb, &camera->view);
state->current_camera = camera;
state->transform_age = camera->transform_age;
done:
camera->in_frame = TRUE;
}
void
rut_camera_resume (RutCamera *camera)
{
CameraFlushState *state;
CoglFramebuffer *fb = camera->fb;
g_return_if_fail (camera->in_frame == FALSE);
g_return_if_fail (camera->suspended == TRUE);
/* While a camera is in a suspended state we don't expect the camera
* to be touched so its transforms shouldn't have changed... */
g_return_if_fail (camera->at_suspend_transform_age == camera->transform_age);
state = cogl_object_get_user_data (COGL_OBJECT (fb), &fb_camera_key);
/* We only expect to be restoring a camera that has been flushed
* before */
g_return_if_fail (state != NULL);
cogl_framebuffer_pop_matrix (fb);
/* If the save turned out to be redundant then we have nothing
* else to restore... */
if (state->current_camera == camera)
goto done;
cogl_framebuffer_set_viewport (fb,
camera->viewport[0],
camera->viewport[1],
camera->viewport[2],
camera->viewport[3]);
cogl_framebuffer_set_projection_matrix (fb, &camera->projection);
state->current_camera = camera;
state->transform_age = camera->transform_age;
done:
camera->in_frame = TRUE;
camera->suspended = FALSE;
}
void
cogl_set_projection_matrix (CoglMatrix *matrix)
{
cogl_framebuffer_set_projection_matrix (cogl_get_draw_framebuffer (), matrix);
}
