From 977b0e4152433b2a68e2b97fe5fe2c0ff6fb20d8 Mon Sep 17 00:00:00 2001
From: Julian T <julian@jtle.dk>
Date: Wed, 3 Feb 2021 17:29:27 +0100
Subject: Can render a simple sphere, without shading

---
 src/render.rs | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 src/render.rs

(limited to 'src/render.rs')

diff --git a/src/render.rs b/src/render.rs
new file mode 100644
index 0000000..dcda672
--- /dev/null
+++ b/src/render.rs
@@ -0,0 +1,51 @@
+//! Implements the main render loop
+//!
+//! This is not a final design
+use crate::camera::film::FilmTile;
+use crate::camera::Camera;
+use crate::scene::Scene;
+
+use crate::core::{Vector2f, Spectrum};
+use crate::Float;
+
+const HALF_PIXEL: Vector2f = Vector2f {x: 0.5, y: 0.5 };
+
+pub struct RenderTask {
+    pub tile: Box<FilmTile>,
+    samples: u32,
+}
+
+pub struct RenderContext<'a> {
+    pub scn: &'a Scene,
+    pub cam: &'a Camera,
+}
+
+impl RenderTask {
+    pub fn new(tile: Box<FilmTile>, samples: u32) -> Self {
+        Self { tile, samples }
+    }
+
+    fn render_at(&self, ctx: &RenderContext, x: i32, y: i32) -> Spectrum {
+        // Create a ray
+        let (r, _) = ctx.cam.generate_ray(&Vector2f::new_xy(x as Float, y as Float));
+
+        // Trace ray
+        if let Some(_) = ctx.scn.intersect(r) {
+            return Spectrum::new_rgb(0.5, 0.5, 0.0);
+        }
+
+        Spectrum::new_rgb(0.0, 0.0, 0.0)
+
+    }
+
+    pub fn render(&mut self, ctx: &RenderContext) {
+        let b = self.tile.bounds.clone();
+        for x in b.min.x .. b.max.x {
+            for y in b.min.y .. b.max.y {
+                let p = Vector2f::new_xy(x as Float, y as Float);
+
+                self.tile.add_sample(&p, self.render_at(ctx, x, y))
+            }
+        }
+    }
+}
-- 
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