nebkor/tinyrenderer
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primitive back-culling

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This commit is contained in:
Joe Ardent 2025-09-07 15:22:53 -07:00
parent 90420bdc72
commit 10882983fe
1 changed files with 16 additions and 10 deletions
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26
src/main.rs
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@ -39,13 +39,11 @@ fn main() {
let w = 800; let w = 800;
let h = 800; let h = 800;
let mut fb = TGAImage::new(w, h, TGAFormat::RGB); let mut fb = TGAImage::new(w, h, TGAFormat::RGB);
// fill_triangles(&mut fb);
// fb.write_file("triangles.tga", true, true).unwrap();
_render_head(&mut fb); _render_head(&mut fb);
} }
fn fill_triangles(fb: &mut TGAImage) { fn _fill_triangles(fb: &mut TGAImage) {
let t1a = Point2i::new(7, 45); let t1a = Point2i::new(7, 45);
let t1b = Point2i::new(35, 100); let t1b = Point2i::new(35, 100);
let t1c = Point2i::new(45, 60); let t1c = Point2i::new(45, 60);
@ -175,17 +173,25 @@ impl Triangle {
pub fn render_filled(&self, color: TGAColor, fb: &mut TGAImage) { pub fn render_filled(&self, color: TGAColor, fb: &mut TGAImage) {
let fb = Arc::new(Mutex::new(fb)); let fb = Arc::new(Mutex::new(fb));
let bb = self.bb(); let bb = self.bb();
let total_area_sign = self.signed_area().signum(); let total_area = self.signed_area();
if total_area < 1.0 {
return;
}
(bb.ymin()..=bb.ymax()).into_par_iter().for_each(|y| { (bb.ymin()..=bb.ymax()).into_par_iter().for_each(|y| {
(bb.xmin()..bb.xmax()).into_par_iter().for_each(|x| { (bb.xmin()..bb.xmax()).into_par_iter().for_each(|x| {
let p = Point2i::new(x, y); let p = Point2i::new(x, y);
let a = Triangle::new(p, self.a, self.b).signed_area().signum() * total_area_sign; let a = Triangle::new(p, self.a, self.b)
let b = Triangle::new(p, self.b, self.c).signed_area().signum() * total_area_sign; .signed_area()
let c = Triangle::new(p, self.c, self.a).signed_area().signum() * total_area_sign; .is_sign_positive();
let b = Triangle::new(p, self.b, self.c)
.signed_area()
.is_sign_positive();
let c = Triangle::new(p, self.c, self.a)
.signed_area()
.is_sign_positive();
if a.is_sign_positive() if a && b
&& b.is_sign_positive() && c
&& c.is_sign_positive()
&& let Ok(mut fb) = fb.lock() && let Ok(mut fb) = fb.lock()
{ {
fb.set(x as u32, y as u32, color); fb.set(x as u32, y as u32, color);