init

1 files changed, 62 insertions, 0 deletions

diff --git a/src/image.rs b/src/image.rs
new file mode 100644
index 0000000..365596b
--- /dev/null
+++ b/src/image.rs
@@ -0,0 +1,62 @@
+use std::io::Write;
+
+use crate::vec3::Color;
+
+pub struct Image {
+    width: usize,
+    height: usize,
+    data: Vec<Color>,
+}
+
+impl Image {
+    pub fn new(width: usize, height: usize) -> Image {
+        let data = vec![
+            Color {
+                x: 0.0,
+                y: 0.0,
+                z: 0.0
+            };
+            width * height
+        ];
+        Image {
+            width,
+            height,
+            data,
+        }
+    }
+
+    pub fn set(&mut self, x: usize, y: usize, color: &Color) -> Result<(), ()> {
+        *self.data.get_mut(y * self.width + x).ok_or(())? = color.clone();
+        Ok(())
+    }
+
+    pub fn get(&self, x: usize, y: usize) -> Option<&Color> {
+        self.data.get(y * self.width + x)
+    }
+
+    pub fn write(&self, output: &mut impl Write) {
+        output.write_fmt(format_args!("P3\n{} {}\n255\n", self.width, self.height)).unwrap();
+        for y in (0..self.height).rev() {
+            for x in 0..self.width {
+                let pixel = self.get(x, y).unwrap();
+                let mut r = pixel.x;
+                let mut g = pixel.y;
+                let mut b = pixel.z;
+
+                // Divide by the number of samples and perform gamma correction for gamma 2
+                r = r.sqrt();
+                g = g.sqrt();
+                b = b.sqrt();
+
+                output
+                    .write_fmt(format_args!(
+                        "{} {} {}\n",
+                        (256.0 * r.clamp(0.0, 0.999)) as u32,
+                        (256.0 * g.clamp(0.0, 0.999)) as u32,
+                        (256.0 * b.clamp(0.0, 0.999)) as u32,
+                    ))
+                    .unwrap();
+            }
+        }
+    }
+}