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// Copyright (C) 2019 Oscar Shrimpton
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.
//! Functions for figuring out what to render
use stockton_bsp::BSPFile;
use stockton_types::Vector3;
/// Get the visible faces according to visdata and frustum culling
// TODO: Write this. For now, just render all faces
pub fn get_visible_faces<'a>(pos: Vector3, file: &BSPFile) -> Vec<usize> {
let mut visible = Vec::with_capacity(file.faces.faces.len());
for x in 0..file.faces.faces.len() {
visible.push(x);
}
return visible;
}
/// Get the viscluster pos lies in
fn get_cluster_id(pos: Vector3, file: &BSPFile) -> usize {
let mut node = &file.tree.root;
while node.leaf.is_none() {
let plane = file.planes.planes[node.plane_idx as usize];
let dist = plane.normal.dot(&pos) - plane.dist;
if dist >= 0.0 {
node = &node.children.as_ref().unwrap()[0]
} else {
node = &node.children.as_ref().unwrap()[1]
}
}
node.leaf.as_ref().unwrap().cluster_id as usize
}
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