Add texture support.

src/elements.rs

@@ -1,8 +1,155 @@
 // elements.rs
 
+use crate::renderer::Ray;
+
+use std::ops::{Add,Mul};
 use nalgebra::*;
-use crate::renderer::{Ray,Color};
-use crate::materials::Material;
+//use image::{DynamicImage,GenericImage,Pixel,Rgba};
+use image::*;
+
+// Gamma functions
+const GAMMA: f32 = 2.2;
+
+fn gamma_decode(encoded: f32) -> f32 {
+    encoded.powf(GAMMA)
+}
+
+// Materials
+pub struct Material {
+  pub coloration: Coloration,
+  pub albedo: f32,
+  pub surface: SurfaceType
+}
+
+impl Material {
+  pub fn new(coloration: Coloration, albedo: f32, surface: SurfaceType) -> Material {
+    Material {
+      coloration: coloration,
+      albedo: albedo,
+      surface: surface
+    }
+  }
+}
+
+#[derive(Copy, Clone)]
+pub struct Color {
+  pub red: f32,
+  pub green: f32,
+  pub blue: f32,
+}
+
+impl Color {
+  pub fn new(red: f32, green: f32, blue: f32) -> Color {
+    Color {
+      red: red,
+      green: green,
+      blue: blue
+    }
+  }
+
+  pub fn from_rgba(rgba: Rgba<u8>) -> Color {
+      Color {
+          red: rgba.0[0] as f32,//gamma_decode((rgba.0[0] as f32)),
+          green: rgba.0[1] as f32,//gamma_decode((rgba.0[1] as f32)),
+          blue: rgba.0[2] as f32,//gamma_decode((rgba.0[2] as f32)),
+      }
+  }
+}
+
+impl Mul for Color {
+  type Output = Color;
+
+  fn mul(self, other: Color) -> Color {
+    Color {
+      red: self.red * other.red,
+      green: self.green * other.green,
+      blue: self.blue * other.blue,
+    }
+  }
+}
+
+impl Mul<f32> for Color {
+  type Output = Color;
+
+  fn mul(self, other: f32) -> Color {
+    Color {
+      red: self.red * other,
+      green: self.green * other,
+      blue: self.blue * other,
+    }
+  }
+}
+
+impl Add for Color {
+  type Output = Color;
+
+  fn add(self, other: Color) -> Color {
+    Color {
+      red: self.red + other.red,
+      green: self.green + other.green,
+      blue: self.blue + other.blue,
+    }
+  }
+}
+
+impl Mul<Color> for f32 {
+  type Output = Color;
+
+  fn mul(self, other: Color) -> Color {
+    other * self
+  }
+}
+
+pub enum Coloration {
+    Color(Color),
+    Texture(Texture)
+}
+
+impl Coloration {
+    pub fn color(&self, coords: &TextureCoords) -> Color {
+        match *self {
+            Coloration::Color(ref c) => c.clone(),
+            Coloration::Texture(ref texture) => {
+                let tex_x = wrap(coords.x, texture.texture.width());
+                let tex_y = wrap(coords.y, texture.texture.height());
+
+                Color::from_rgba((&texture.texture).get_pixel(tex_x, tex_y))
+            }
+        }
+    }
+}
+
+// T)extures
+#[derive(Clone)]
+pub struct Texture {
+    pub texture: DynamicImage,
+}
+
+pub fn dummy_texture() -> DynamicImage {
+    DynamicImage::new_rgb8(1, 1)
+}
+
+fn wrap(val: f32, bound: u32) -> u32 {
+    let signed_bound = bound as i32;
+    let float_coord = val * bound as f32;
+    let wrapped_coord = (float_coord as i32) % signed_bound;
+    if wrapped_coord < 0 {
+        (wrapped_coord + signed_bound) as u32
+    } else {
+        wrapped_coord as u32
+    }
+}
+
+
+pub struct TextureCoords {
+    pub x: f32,
+    pub y: f32,
+}
+
+pub enum SurfaceType {
+  Diffuse,
+  Reflective { reflectivity: f32 },
+}
 
 // Element root class
 pub enum Element {
@@ -18,12 +165,12 @@ impl Element {
     }
   }
 
-  pub fn color(&self) -> &Color {
-    match *self {
-      Element::Sphere(ref s) => &s.material.coloration,
-      Element::Plane(ref p) => &p.material.coloration,
-    }
-  }
+//  pub fn color(&self) -> &Color {
+//    match *self {
+//      Element::Sphere(ref s) => &s.material.coloration,
+//      Element::Plane(ref p) => &p.material.coloration,
+//    }
+//  }
 
   pub fn normal(&self, pos: Vec3<f64>) -> Vec3<f64> {
     match *self {
@@ -63,6 +210,30 @@ impl LightSrc {
 
 // Specific Elements
 
+pub trait Intersectable {
+  fn intersect(&self, ray: &Ray) -> Option<f64>;
+
+  //fn surface_normal(&self, hit_point: &Vec3<f64>) -> Vec3<f64>;
+  fn texture_coords(&self, hit_point: &Vec3<f64>) -> TextureCoords;
+}
+
+impl Intersectable for Element {
+  fn intersect(&self, ray: &Ray) -> Option<f64> {
+    match *self {
+      Element::Sphere(ref s) => s.intersect(ray),
+      Element::Plane(ref p) => p.intersect(ray),
+    }
+  }
+
+  fn texture_coords(&self, hit_point: &Vec3<f64>) -> TextureCoords {
+      match *self {
+          Element::Sphere(ref s) => s.texture_coords(hit_point),
+          Element::Plane(ref p) => p.texture_coords(hit_point),
+      }
+  }
+}
+
+
 pub struct Sphere {
   pub pos: Vec3<f64>,
   pub radius: f64,
@@ -99,6 +270,14 @@ impl Intersectable for Sphere {
     }
   }
 
+  fn texture_coords(&self, hit_point: &Vec3<f64>) -> TextureCoords {
+    let hit_vec = *hit_point - self.pos;
+    TextureCoords {
+        x: (1.0 + (hit_vec.z.atan2(hit_vec.x) as f32) / std::f32::consts::PI) * 0.5,
+        y: (hit_vec.y / self.radius).acos() as f32 / std::f32::consts::PI,
+    }
+  }
+
 }
 
 pub struct Plane {
@@ -108,10 +287,6 @@ pub struct Plane {
   pub material: Material,
 }
 
-pub trait Intersectable {
-  fn intersect(&self, ray: &Ray) -> Option<f64>;
-}
-
 impl Intersectable for Plane {
   fn intersect(&self, ray: &Ray) -> Option<f64> {
     let normal = &self.normal;
@@ -125,4 +300,12 @@ impl Intersectable for Plane {
     }
     None
   }
+
+  // TODO: Implement this
+  fn texture_coords(&self, hit_point: &Vec3<f64>) -> TextureCoords {
+      TextureCoords {
+          x: 0.5,
+          y: 0.5,
+      }
+  }
 }

src/main.rs

@@ -4,25 +4,26 @@ mod camera;
 use crate::camera::PerspectiveCamera;
 
 mod renderer;
-use crate::renderer::{Color,cast_ray};
+use crate::renderer::cast_ray;
 
-mod materials;
-use crate::materials::{Material,SurfaceType};
+//use crate::materials::{Material,SurfaceType};
 
 mod elements;
-use crate::elements::{Plane,Sphere,Element,LightSrc};
+use crate::elements::*;
 
 #[macro_use]
 extern crate bmp;
 extern crate rand;
 extern crate nalgebra;
 
+use std::fs::File;
+use std::path::*;
+
 use rand::Rng;
 use nalgebra::*;
 use bmp::Image;
 use bmp::Pixel;
 
-use std::{thread,time};
 use std::io::{Write,stdout};
 use crossterm::{QueueableCommand,cursor,terminal,ExecutableCommand};
 
@@ -39,49 +40,60 @@ fn initialize_scene(camera: &mut PerspectiveCamera) {
     let red: f32 = rng.gen::<f32>() * 100.0;
     let green: f32 = rng.gen::<f32>() * 100.0;
     let blue: f32 = rng.gen::<f32>() * 100.0;
+
+    let color = Color { red, green, blue };
+
     let sphere = Sphere {
       pos: Vec3::new(x, y, 100.0),
       radius: radius,
-      material: Material::new(Color::new(red, green, blue), 2.0, SurfaceType::Reflective { reflectivity: rng.gen::<f32>() }),
+      material: Material::new(Coloration::Color(color), 2.0, SurfaceType::Reflective { reflectivity: rng.gen::<f32>() }),
     };
-    camera.elements.push(Element::Sphere(sphere));
+    //camera.elements.push(Element::Sphere(sphere));
   }
 
+  let color = Color { red: 30.0, green: 30.0, blue: 30.0 };
+
   let back_plane = Plane {
     //pos: Vec3::new(0.0, 0.0, 100.0),
     pos: Vec3::new(0.0, 0.0, 1500.0),
     //color: Color::new(20.0, 20.0, 255.0),
-    material: Material::new(Color::new(20.0, 20.0, 255.0), 2.0, SurfaceType::Diffuse),
+    material: Material::new(Coloration::Color(color), 2.0, SurfaceType::Diffuse),
     normal: Vec3::new(0.0, 0.0, 1.0),
   };
   camera.elements.push(Element::Plane(back_plane));
 
-  let bottom_plane = Plane {
-    pos: Vec3::new(2500.0, 0.0, 1500.0),
-    //color: Color::new(20.0, 20.0, 80.0),
-    material: Material::new(Color::new(20.0, 20.0, 255.0), 2.0, SurfaceType::Diffuse),
-    normal: Vec3::new(0.0, 0.2, 1.0),
-  };
+//  let bottom_plane = Plane {
+//    pos: Vec3::new(2500.0, 0.0, 1500.0),
+//    //color: Coloration::Texture(texture),
+//    //material: Material::new(Coloration::Texture(dummy_texture.clone()), 2.0, SurfaceType::Diffuse),
+//    normal: Vec3::new(0.0, 0.2, 1.0),
+//  };
   //camera.elements.push(Element::Plane(bottom_plane));
 
+  let path = Path::new("texture/granite_base.png");
+
+  let texture_image = image::open(&path).unwrap();
+
+  let base_texture = Texture { texture: texture_image };
+
   let center_sphere = Sphere {
     pos: Vec3::new(1280.0, 1290.0, 1000.0),
     radius: 300.0,
-    material: Material::new(Color::new(255.0, 255.0, 255.0), 2.0, SurfaceType::Reflective { reflectivity: 0.8 }),
+    material: Material::new(Coloration::Texture(base_texture.clone()), 2.0, SurfaceType::Reflective { reflectivity: 0.1 }),
   };
   camera.elements.push(Element::Sphere(center_sphere));
 
   let left_sphere = Sphere {
     pos: Vec3::new(200.0, 1800.0, 500.0),
     radius: 200.0,
-    material: Material::new(Color::new(255.0, 20.0, 20.0), 2.0, SurfaceType::Reflective { reflectivity: 0.1 }),
+    material: Material::new(Coloration::Texture(base_texture.clone()), 2.0, SurfaceType::Reflective { reflectivity: 0.1 }),
   };
   camera.elements.push(Element::Sphere(left_sphere));
 
   let top_sphere = Sphere {
     pos: Vec3::new(1080.0, 700.0, 500.0),
     radius: 200.0,
-    material: Material::new(Color::new(255.0, 20.0, 20.0), 2.0, SurfaceType::Diffuse),
+    material: Material::new(Coloration::Texture(base_texture.clone()), 2.0, SurfaceType::Diffuse),
   };
   camera.elements.push(Element::Sphere(top_sphere));
 
@@ -109,7 +121,6 @@ fn main() {
   stdout.execute(cursor::Hide).unwrap();
 
   stdout.write_all(format!("Progress: ").as_bytes()).unwrap();
-  // TODO: Uncomment
   for (x, y) in camera.output_img.coordinates() {
     stdout.queue(cursor::SavePosition).unwrap();
     stdout.write_all(format!("{:.1}%", camera.percent_complete(y)).as_bytes()).unwrap();

src/materials.rs

@@ -1,24 +0,0 @@
-// materials.rs
-
-use crate::Color;
-
-pub struct Material {
-  pub coloration: Color,
-  pub albedo: f32,
-  pub surface: SurfaceType
-}
-
-impl Material {
-  pub fn new(coloration: Color, albedo: f32, surface: SurfaceType) -> Material {
-    Material {
-      coloration: coloration,
-      albedo: albedo,
-      surface: surface
-    }
-  }
-}
-
-pub enum SurfaceType {
-  Diffuse,
-  Reflective { reflectivity: f32 },
-}

src/renderer.rs

@@ -2,12 +2,10 @@
 
 use std::f32;
 use nalgebra::*;
-use std::ops::{Add,Mul};
 
 use crate::camera::*;
 
-use crate::elements::{Element,Intersectable};
-use crate::materials::SurfaceType;
+use crate::elements::*;
 
 const BLACK: Color = Color {
     red: 0.0,
@@ -33,70 +31,6 @@ impl Ray {
   }
 }
 
-
-
-#[derive(Copy, Clone)]
-pub struct Color {
-  pub red: f32,
-  pub green: f32,
-  pub blue: f32,
-}
-
-impl Color {
-  pub fn new(red: f32, green: f32, blue: f32) -> Color {
-    Color {
-      red: red,
-      green: green,
-      blue: blue
-    }
-  }
-}
-
-impl Mul for Color {
-  type Output = Color;
-
-  fn mul(self, other: Color) -> Color {
-    Color {
-      red: self.red * other.red,
-      green: self.green * other.green,
-      blue: self.blue * other.blue,
-    }
-  }
-}
-
-impl Mul<f32> for Color {
-  type Output = Color;
-
-  fn mul(self, other: f32) -> Color {
-    Color {
-      red: self.red * other,
-      green: self.green * other,
-      blue: self.blue * other,
-    }
-  }
-}
-
-impl Add for Color {
-  type Output = Color;
-
-  fn add(self, other: Color) -> Color {
-    Color {
-      red: self.red + other.red,
-      green: self.green + other.green,
-      blue: self.blue + other.blue,
-    }
-  }
-}
-
-impl Mul<Color> for f32 {
-  type Output = Color;
-
-  fn mul(self, other: Color) -> Color {
-    other * self
-  }
-}
-
-
 pub struct Intersection<'a> {
   pub distance: f64,
   pub object: &'a Element
@@ -111,15 +45,6 @@ impl<'a> Intersection<'a> {
   }
 }
 
-impl Intersectable for Element {
-  fn intersect(&self, ray: &Ray) -> Option<f64> {
-    match *self {
-      Element::Sphere(ref s) => s.intersect(ray),
-      Element::Plane(ref p) => p.intersect(ray),
-    }
-  }
-}
-
 
 fn create_reflection(normal: Vec3<f64>, incident: Vec3<f64>, hit_point: Vec3<f64>, bias: f64) -> Ray {
     Ray {
@@ -155,6 +80,7 @@ fn shade_diffuse(camera: &PerspectiveCamera, object: &Element, hit_point: Vec3<f
         let material = object.material();
         // TODO: Change light intensity to take hit_point for some reason (read source)
         // https://github.com/bheisler/raytracer/blob/7130556181de7fc59eaa29346f5d4134db3e720e/src/rendering.rs#L195
+        let texture_coords = object.texture_coords(&hit_point);
 
         // Shadow stuff
         let shadow_ray = Ray {
@@ -171,7 +97,7 @@ fn shade_diffuse(camera: &PerspectiveCamera, object: &Element, hit_point: Vec3<f
         let light_reflected = material.albedo / f32::consts::PI;
 
         let light_color = light_intensity * light_power * light_reflected;
-        color = color + (material.coloration * light_color);
+        color = color + (material.coloration.color(&texture_coords) * light_color);
     }
 
     return color;