1 files changed, 79 insertions, 0 deletions
diff --git a/src/common.rs b/src/common.rs
new file mode 100644
index 0000000..3975609
--- /dev/null
+++ b/src/common.rs
@@ -0,0 +1,79 @@
+use crate::calculus::calculus::Point3;
+use crate::interval::Interval;
+
+// "Ideal" aspect ratio, allowing fraction
+pub const ASPECT_RATIO: f32 = 16.0f32 / 9.0f32;
+pub const IMG_WIDTH: usize = 400;
+pub const IMG_HEIGHT: usize = get_image_height(IMG_WIDTH, ASPECT_RATIO);
+
+pub const VIEWPORT_HEIGHT: f32 = 2.0;
+pub const FOCAL_LENGTH: f32 = 1.0;
+pub const CAMERA_CENTER: Point3 = Point3 { x: 0f32, y: 0f32, z: 0f32 };
+
+pub const SAMPLES_PER_PIXEL: usize = 100;
+
+pub const fn get_image_height(image_width: usize, aspect_ratio: f32) -> usize {
+    let image_height = (image_width as f32 / aspect_ratio) as usize;
+    if image_width < 1 { 1 } else { image_height }
+}
+
+pub struct Color {
+    pub r: f32,
+    pub g: f32,
+    pub b: f32,
+}
+
+impl Color {
+    pub fn new(r: f32, g: f32, b: f32) -> Self {
+        Self { r, g, b }
+    }
+
+    pub fn mul_scalar(&self, scalar: f32) -> Color {
+        Self {
+            r: self.r * scalar,
+            g: self.g * scalar,
+            b: self.b * scalar,
+        }
+    }
+
+    pub fn add(&self, other: &Self) -> Color {
+        Self {
+            r: self.r + other.r,
+            g: self.g + other.g,
+            b: self.b + other.b
+        }
+    }
+}
+
+
+#[derive(Debug, Copy, Clone)]
+pub struct Pixel {
+    pub r: u8,
+    pub g: u8,
+    pub b: u8,
+}
+
+impl Pixel {
+    pub fn from_frac(r: f32, g: f32, b: f32) -> Self {
+        let intensity = Interval::new(0.0, 0.999);
+        Self {
+            r: (256.0 * intensity.clamp(r)) as u8,
+            g: (256.0 * intensity.clamp(g)) as u8,
+            b: (256.0 * intensity.clamp(b)) as u8,
+        }
+    }
+
+    pub fn from_color(color: &Color) -> Self {
+        let (r, g, b) = (color.r, color.g, color.b);
+        Self::from_frac(r, g, b)
+    }
+}
+
+impl Default for Pixel {
+    fn default() -> Self {
+        Pixel { r:0, g:0, b:0 }
+    }
+}
+
+pub type DisplayBuffer = [[Pixel; IMG_WIDTH]; IMG_HEIGHT];
+