Started work on implementing vectors bounding and film

8 files changed, 232 insertions, 0 deletions

diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..169dc89
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "pathtrace"
+version = "0.1.0"
diff --git a/src/bounding.rs b/src/bounding.rs
new file mode 100644
index 0000000..d5a3ed0
--- /dev/null
+++ b/src/bounding.rs
@@ -0,0 +1,62 @@
+use crate::{Number, Float};
+use crate::vector::Vector2;
+use std::cmp;
+
+pub struct Bound2<T: Number> {
+    pub min: Vector2<T>,
+    pub max: Vector2<T>
+}
+
+pub type Bound2i = Bound2<i32>;
+pub type Bound2f = Bound2<Float>;
+
+fn min<T: Number> (a: T, b: T) -> T {
+    if b < a {
+        return b;
+    }
+    a
+}
+
+fn max<T: Number> (a: T, b: T) -> T {
+    if b > a {
+        return b;
+    }
+    a
+}
+
+impl<T: Number> Bound2<T> {
+    fn new(p0: &Vector2<T>, p1: &Vector2<T>) -> Bound2<T> {
+        let min = Vector2::from_xy(min(p0.x, p1.x), min(p0.y, p1.y));
+        let max = Vector2::from_xy(max(p0.x, p1.x), max(p0.y, p1.y));
+
+        Bound2 { min, max }
+    }
+
+    fn diagonal(&self) -> Vector2<T> {
+        self.max - self.min
+    }
+
+    fn area(&self) -> T {
+        let diag = self.diagonal();
+        return diag.x * diag.y;
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn create_test() -> Bound2<i32> {
+        Bound2::new(
+            &Vector2::from_xy(1, 2),
+            &Vector2::from_xy(10, 3)
+            )
+    }
+
+    #[test]
+    fn area() {
+        let b = create_test();
+
+        assert!(b.area() == 9);
+    }
+}
diff --git a/src/camera/film.rs b/src/camera/film.rs
new file mode 100644
index 0000000..c4a65ce
--- /dev/null
+++ b/src/camera/film.rs
@@ -0,0 +1,51 @@
+use crate::vector::{Vector2, Vector2f};
+use crate::Float;
+use crate::bounding::Bound2i;
+use super::filter::Filter;
+
+#[derive(Clone)]
+pub struct Pixel {
+    pub rgb: [Float; 3],
+}
+
+pub struct Film<'a> {
+    pub resolution: Vector2<usize>,
+
+    pixels: Vec<Pixel>,
+    filter: &'a dyn Filter,
+    filter_radius: Vector2f,
+}
+
+pub struct FilmTile {
+    
+}
+
+impl Pixel {
+    fn new() -> Pixel {
+        Pixel { rgb: [0.0, 0.0, 0.0] }
+    }
+}
+
+impl Film<'_> {
+    fn new(resolution: Vector2<usize>, filter: & dyn Filter) -> Film {
+        let area = resolution.x * resolution.y;
+        Film {
+            resolution,
+            pixels: vec![Pixel::new(); area],
+            filter,
+            filter_radius: filter.radius()
+        }
+    }
+
+    fn get_tile(bound: &Bound2i) {
+        // Used to calculate descrete coordinates into continues
+        let halfpixel = Vector2f::from_xy(0.5, 0.5);
+    }
+
+    fn splat(&mut self, point: &Vector2<usize>, pixel: &Pixel) {
+        let index = point.x + point.y * self.resolution.x;
+
+        self.pixels[index] = pixel.clone();
+    }
+}
+
diff --git a/src/camera/filter/mod.rs b/src/camera/filter/mod.rs
new file mode 100644
index 0000000..93c6fc5
--- /dev/null
+++ b/src/camera/filter/mod.rs
@@ -0,0 +1,22 @@
+use crate::vector::Vector2f;
+use crate::Float;
+
+pub trait Filter {
+    fn eval(&self, point: &Vector2f) -> Float;
+    fn radius(&self) -> Vector2f;
+}
+
+pub struct BoxFilter {
+    radius: Vector2f,
+}
+
+// The same a no filter, and can give aliasing in final image
+impl Filter for BoxFilter {
+    fn eval(&self, _: &Vector2f) -> Float {
+        1.0
+    }
+
+    fn radius(&self) -> Vector2f {
+        self.radius
+    }
+}
diff --git a/src/camera/mod.rs b/src/camera/mod.rs
new file mode 100644
index 0000000..bba95f7
--- /dev/null
+++ b/src/camera/mod.rs
@@ -0,0 +1,2 @@
+mod film;
+mod filter;
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..1d43855
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,21 @@
+mod vector;
+mod bounding;
+mod camera;
+mod spectrum;
+
+use std::ops::{Sub, Mul};
+use std::cmp;
+
+pub trait Number:
+    Copy +
+    cmp::PartialOrd +
+    Sub<Output = Self> +
+    Mul<Output = Self>
+{}
+
+impl Number for usize {}
+impl Number for i32 {}
+impl Number for f32 {}
+
+// Used throughout the program
+type Float = f32;
diff --git a/src/spectrum.rs b/src/spectrum.rs
new file mode 100644
index 0000000..aa37056
--- /dev/null
+++ b/src/spectrum.rs
@@ -0,0 +1,13 @@
+use crate::Float;
+
+// TODO implement SampledSpectrum instead for nicer images
+
+pub struct Spectrum {
+    c: [Float; 3],
+}
+
+impl Spectrum {
+    fn from_rgb(r: Float, g: Float, b: Float) -> Spectrum {
+        Spectrum { c: [r, g, b] }
+    }
+}
diff --git a/src/vector.rs b/src/vector.rs
new file mode 100644
index 0000000..9b89168
--- /dev/null
+++ b/src/vector.rs
@@ -0,0 +1,56 @@
+use crate::{Float, Number};
+use std::ops::{Sub};
+
+#[derive(Clone, Copy)]
+pub struct Vector2<T: Number> {
+    pub x: T,
+    pub y: T,
+}
+
+pub type Vector2f = Vector2<Float>;
+pub type Vector2i = Vector2<i32>;
+
+impl<T: Number> Vector2<T> {
+    pub fn new(initial: T) -> Vector2<T> {
+        Vector2 { x: initial, y: initial }
+    }
+
+    pub fn from_xy(x: T, y: T) -> Vector2<T> {
+        Vector2 { x, y }
+    }
+}
+
+impl<T: Number> Sub for Vector2<T> {
+    type Output = Self;
+    fn sub(self, op: Self) -> Self::Output {
+        Vector2 {
+            x: self.x - op.x,
+            y: self.y - op.y,
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn new_vec2() {
+        let v = Vector2::from_xy(2.0, 10.0);
+
+        assert!(v.x == 2.0 && v.y == 10.0);
+
+        let v = Vector2::new(3);
+
+        assert!(v.x == 3 && v.y == 3);
+    }
+
+    #[test]
+    fn sub_vec2() {
+        let v1 = Vector2::from_xy(10, 11);
+        let v2 = Vector2::from_xy(2, 3);
+
+        let v3 = v1-v2;
+        assert!(v3.x == 8 && v3.y == 8);
+    }
+}