first sphere

src/main.rs

@@ -1,18 +1,17 @@
 extern crate sdl2;
 
+mod object;
+mod ray;
+mod render;
+mod sphere;
+
+use render::render;
 use sdl2::event::Event;
 use sdl2::keyboard::Keycode;
-use sdl2::pixels::Color;
 use sdl2::pixels::PixelFormatEnum;
 use sdl2::surface::Surface;
 use std::time::Duration;
 
-fn put_pixel(data: &mut [u8], x: usize, y: usize, color: Color) {
-    data[y * 3 * 800 + x * 3] = color.r;
-    data[y * 3 * 800 + x * 3 + 1] = color.g;
-    data[y * 3 * 800 + x * 3 + 2] = color.b;
-}
-
 fn main() {
     let sdl_context = sdl2::init().unwrap();
     let video_subsystem = sdl_context.video().unwrap();
@@ -34,20 +33,21 @@ fn main() {
     let mut event_pump = sdl_context.event_pump().unwrap();
     let mut i = 0;
     'running: loop {
-        put_pixel(
-            &mut *data,
-            i,
-            i,
-            Color {
-                r: 0,
-                g: 0,
-                b: 0,
-                a: 0,
-            },
-        );
-        if i < 599 {
-            i += 1;
-        }
+        render(&mut *data);
+        // put_pixel(
+        //     &mut *data,
+        //     i,
+        //     i,
+        //     Color {
+        //         r: 0,
+        //         g: 0,
+        //         b: 0,
+        //         a: 0,
+        //     },
+        // );
+        // if i < 599 {
+        //     i += 1;
+        // }
         // canvas.set_draw_color(Color::RGB(i, 64, 255 - i));
         let surface =
             Surface::from_data(&mut *data, 800, 600, 2400, PixelFormatEnum::RGB24).unwrap();

src/object.rs

@@ -1,4 +1,4 @@
-use super::Ray;
+use super::ray::Ray;
 
 pub trait Object {
     fn get_intersection(&self, ray: Ray) -> Option<f64>;

src/ray.rs

@@ -1,3 +1,4 @@
+#[derive(Clone, Copy)]
 pub struct Ray {
     pub origin: [f64; 3],
     pub direction: [f64; 3],

src/render.rs

@@ -0,0 +1,92 @@
+extern crate mat4;
+extern crate vec3;
+
+use crate::object::Object;
+use crate::ray::Ray;
+use crate::sphere::Sphere;
+use sdl2::pixels::Color;
+
+struct Camera {
+    rv: [f64; 3],
+    uv: [f64; 3],
+}
+
+fn put_pixel(data: &mut [u8], x: usize, y: usize, color: Color) {
+    data[y * 3 * 800 + x * 3] = color.r;
+    data[y * 3 * 800 + x * 3 + 1] = color.g;
+    data[y * 3 * 800 + x * 3 + 2] = color.b;
+}
+
+pub fn render(data: &mut [u8]) {
+    let sphere = Sphere {};
+    let projection_matrix: [f64; 16] = *mat4::perspective(
+        &mut mat4::new_zero(),
+        &(45. * 3.141592 / 180.),
+        &(800. / 600.),
+        &(0.1),
+        &(1000.),
+    );
+    let view_matrix: [f64; 16] = *mat4::translate(
+        &mut mat4::new_identity(),
+        &mat4::new_identity(),
+        &vec3::new(0., 0., -10.),
+    );
+    let model_matrix: [f64; 16] = *mat4::translate(
+        &mut mat4::new_identity(),
+        &mat4::new_identity(),
+        &vec3::new(1., 1., 0.),
+    );
+    let camera = Camera {
+        rv: [1., 0., 0.],
+        uv: [0., 1., 0.],
+    };
+    for x in 0..800 {
+        for y in 0..600 {
+            let mut ray = Ray {
+                origin: [0., 0., 0.],
+                direction: [0., 0., 1.],
+            };
+            ray.direction[0] += (x as f64 - 400.) / 800.;
+            ray.direction[1] += (y as f64 - 300.) / 800.;
+            let mut n =
+                ray.direction[0].powi(2) + ray.direction[1].powi(2) + ray.direction[2].powi(2);
+            n = n.sqrt();
+            ray.direction[0] /= n;
+            ray.direction[1] /= n;
+            ray.direction[2] /= n;
+            let ray2 = Box::clone(&Box::new(ray));
+            // vec3::transform_mat4(&mut ray.direction, &ray2.direction, &projection_matrix);
+            vec3::transform_mat4(&mut ray.origin, &ray2.origin, &view_matrix);
+            let ray2 = Box::clone(&Box::new(ray));
+            vec3::transform_mat4(&mut ray.origin, &ray2.origin, &model_matrix);
+            match sphere.get_intersection(ray) {
+                Some(v) => {
+                    put_pixel(
+                        &mut *data,
+                        x,
+                        y,
+                        Color {
+                            r: 255,
+                            g: 0,
+                            b: 0,
+                            a: 0,
+                        },
+                    );
+                }
+                None => {
+                    put_pixel(
+                        &mut *data,
+                        x,
+                        y,
+                        Color {
+                            r: 0,
+                            g: 0,
+                            b: 0,
+                            a: 0,
+                        },
+                    );
+                }
+            }
+        }
+    }
+}

src/sphere.rs

@@ -1,8 +1,8 @@
 extern crate vec3;
-use super::Object;
-use super::Ray;
+use super::object::Object;
+use super::ray::Ray;
 
-struct Sphere {}
+pub struct Sphere {}
 
 fn return_min(root1: f64, root2: f64) -> Option<f64> {
     if root1 < root2 && root1 > 0. {