void
rut_graphable_fully_transform_point (RutObject *graphable,
RutCamera *camera,
float *x,
float *y,
float *z)
{
CoglMatrix modelview;
const CoglMatrix *projection;
const float *viewport;
float point[3] = { *x, *y, *z };
rut_graphable_get_modelview (graphable, camera, &modelview);
projection = rut_camera_get_projection (camera);
viewport = rut_camera_get_viewport (camera);
rut_util_fully_transform_vertices (&modelview,
projection,
viewport,
point,
point,
1);
*x = point[0];
*y = point[1];
*z = point[2];
}
void
rut_camera_unproject_coord (RutCamera *camera,
const CoglMatrix *modelview,
const CoglMatrix *inverse_modelview,
float object_coord_z,
float *x,
float *y)
{
const CoglMatrix *projection = rut_camera_get_projection (camera);
const CoglMatrix *inverse_projection =
rut_camera_get_inverse_projection (camera);
//float z;
float ndc_x, ndc_y, ndc_z, ndc_w;
float eye_x, eye_y, eye_z, eye_w;
const float *viewport = rut_camera_get_viewport (camera);
/* Convert item z into NDC z */
{
//float x = 0, y = 0, z = 0, w = 1;
float z = 0, w = 1;
float tmp_x, tmp_y, tmp_z;
const CoglMatrix *m = modelview;
tmp_x = m->xw;
tmp_y = m->yw;
tmp_z = m->zw;
m = projection;
z = m->zx * tmp_x + m->zy * tmp_y + m->zz * tmp_z + m->zw;
w = m->wx * tmp_x + m->wy * tmp_y + m->wz * tmp_z + m->ww;
ndc_z = z / w;
}
/* Undo the Viewport transform, putting us in Normalized Device Coords */
ndc_x = (*x - viewport[0]) * 2.0f / viewport[2] - 1.0f;
ndc_y = ((viewport[3] - 1 + viewport[1] - *y) * 2.0f / viewport[3] - 1.0f);
/* Undo the Projection, putting us in Eye Coords. */
ndc_w = 1;
cogl_matrix_transform_point (inverse_projection,
&ndc_x, &ndc_y, &ndc_z, &ndc_w);
eye_x = ndc_x / ndc_w;
eye_y = ndc_y / ndc_w;
eye_z = ndc_z / ndc_w;
eye_w = 1;
/* Undo the Modelview transform, putting us in Object Coords */
cogl_matrix_transform_point (inverse_modelview,
&eye_x,
&eye_y,
&eye_z,
&eye_w);
*x = eye_x;
*y = eye_y;
//*z = eye_z;
}
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;
}
const CoglMatrix *
rut_camera_get_inverse_projection (RutCamera *camera)
{
const CoglMatrix *projection;
if (camera->inverse_projection_age == camera->projection_age)
return &camera->inverse_projection;
projection = rut_camera_get_projection (camera);
if (!cogl_matrix_get_inverse (projection,
&camera->inverse_projection))
return NULL;
camera->inverse_projection_age = camera->projection_age;
return &camera->inverse_projection;
}
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);
}
}
}
