/* Transform a homogeneous vertex position from model space to Cogl
* window coordinates (with 0,0 being top left) */
static void
transform_point (CoglMatrix *matrix_mv,
CoglMatrix *matrix_p,
float *viewport,
float *x,
float *y)
{
float z = 0;
float w = 1;
/* Apply the modelview matrix transform */
cogl_matrix_transform_point (matrix_mv, x, y, &z, &w);
/* Apply the projection matrix transform */
cogl_matrix_transform_point (matrix_p, x, y, &z, &w);
/* Perform perspective division */
*x /= w;
*y /= w;
/* Apply viewport transform */
*x = VIEWPORT_TRANSFORM_X (*x, viewport[0], viewport[2]);
*y = VIEWPORT_TRANSFORM_Y (*y, viewport[1], viewport[3]);
}
void
update_control_point_positions(rig_selection_tool_t *tool,
rut_object_t *paint_camera) /* 2d ui camera */
{
rut_object_t *camera = tool->camera_component;
c_llist_t *l;
for (l = tool->selected_entities; l; l = l->next) {
entity_state_t *entity_state = l->data;
c_matrix_t transform;
const c_matrix_t *projection;
float screen_space[4], x, y;
const float *viewport;
c_llist_t *l2;
get_modelview_matrix(tool->camera, entity_state->entity, &transform);
projection = rut_camera_get_projection(camera);
viewport = rut_camera_get_viewport(camera);
for (l2 = entity_state->control_points; l2; l2 = l2->next) {
control_point_t *point = l2->data;
point->position[0] = point->x;
point->position[1] = point->y;
point->position[2] = point->z;
c_matrix_transform_points(&transform,
3, /* num components for input */
sizeof(float) * 3, /* input stride */
point->position,
sizeof(float) * 3, /* output stride */
point->position,
1 /* n_points */);
/* update the input region, need project the transformed point and
* do
* the viewport transform */
screen_space[0] = point->position[0];
screen_space[1] = point->position[1];
screen_space[2] = point->position[2];
c_matrix_project_points(projection,
3, /* num components for input */
sizeof(float) * 3, /* input stride */
screen_space,
sizeof(float) * 4, /* output stride */
screen_space,
1 /* n_points */);
/* perspective divide */
screen_space[0] /= screen_space[3];
screen_space[1] /= screen_space[3];
/* apply viewport transform */
x = VIEWPORT_TRANSFORM_X(screen_space[0], viewport[0], viewport[2]);
y = VIEWPORT_TRANSFORM_Y(screen_space[1], viewport[1], viewport[3]);
point->screen_pos[0] = x;
point->screen_pos[1] = y;
map_window_coords_to_overlay_coord(
paint_camera, tool->tool_overlay, &x, &y);
rut_transform_init_identity(point->transform);
rut_transform_translate(point->transform, x, y, 0);
rut_input_region_set_circle(point->input_region, x, y, 10);
}
}
}