/*
* Perform view frustum culling from a specific camera viewpoint
*/
void Renderer::cullFromCamera(Scene *scene, Camera* camera,
ShaderManager* shader_manager)
{
std::vector<SceneObject*> scene_objects;
glm::mat4 view_matrix = camera->getViewMatrix();
glm::mat4 projection_matrix = camera->getProjectionMatrix();
glm::mat4 vp_matrix = glm::mat4(projection_matrix * view_matrix);
glm::vec3 campos(view_matrix[3]);
scene_objects.reserve(1024);
scene_objects.clear();
render_data_vector.clear();
// Travese all scene objects in the scene as a tree and do frustum culling at the same time if enabled
// 1. Build the view frustum
float frustum[6][4];
build_frustum(frustum, (const float*) glm::value_ptr(vp_matrix));
// 2. Iteratively execute frustum culling for each root object (as well as its children objects recursively)
SceneObject *object = scene->getRoot();
if (DEBUG_RENDERER) {
LOGD("FRUSTUM: start frustum culling for root %s\n", object->name().c_str());
}
// frustum_cull(camera->owner_object()->transform()->position(), object, frustum, scene_objects, scene->get_frustum_culling(), 0);
frustum_cull(campos, object, frustum, scene_objects, scene->get_frustum_culling(), 0);
if (DEBUG_RENDERER) {
LOGD("FRUSTUM: end frustum culling for root %s\n", object->name().c_str());
}
// 3. do occlusion culling, if enabled
occlusion_cull(scene, scene_objects, shader_manager, vp_matrix);
}
/*
* Perform view frustum culling from a specific camera viewpoint
*/
void Renderer::cullFromCamera(Scene *scene, Camera* camera,
ShaderManager* shader_manager,
std::vector<SceneObject*>& scene_objects) {
render_data_vector.clear();
scene_objects.clear();
glm::mat4 view_matrix = camera->getViewMatrix();
glm::mat4 projection_matrix = camera->getProjectionMatrix();
glm::mat4 vp_matrix = glm::mat4(projection_matrix * view_matrix);
// 1. Travese all scene objects in the scene as a tree and do frustum culling at the same time if enabled
if (scene->get_frustum_culling()) {
if (DEBUG_RENDERER) {
LOGD("FRUSTUM: start frustum culling\n");
}
// 1. Build the view frustum
float frustum[6][4];
build_frustum(frustum, (const float*) glm::value_ptr(vp_matrix));
// 2. Iteratively execute frustum culling for each root object (as well as its children objects recursively)
std::vector<SceneObject*> root_objects = scene->scene_objects();
for (auto it = root_objects.begin(); it != root_objects.end(); ++it) {
SceneObject *object = *it;
if (DEBUG_RENDERER) {
LOGD("FRUSTUM: start frustum culling for root %s\n",
object->name().c_str());
}
frustum_cull(camera->owner_object()->transform()->position(), object, frustum, scene_objects, true, 0);
if (DEBUG_RENDERER) {
LOGD("FRUSTUM: end frustum culling for root %s\n",
object->name().c_str());
}
}
if (DEBUG_RENDERER) {
LOGD("FRUSTUM: end frustum culling\n");
}
}
else
scene_objects = scene->getWholeSceneObjects();
// 2. do occlusion culling, if enabled
occlusion_cull(scene, scene_objects, shader_manager, vp_matrix);
}
