Started creating an interface for surfaces.

Testing it out by making a bogus TriangleMesh surface type.

src/main.rs

@@ -12,6 +12,7 @@ mod parse;
 mod renderer;
 mod image;
 mod triangle;
+mod surface;
 mod bvh;
 mod halton;
 
@@ -21,9 +22,9 @@ use docopt::Docopt;
 
 use math::{Point, Matrix4x4};
 use ray::Ray;
-use bbox::BBox;
 use camera::Camera;
 use renderer::Renderer;
+use surface::triangle_mesh::TriangleMesh;
 
 // ----------------------------------------------------------------
 
@@ -73,7 +74,7 @@ fn main() {
     println!("Ray size: {} bytes", mem::size_of::<Ray>());
 
     // Generate a scene of triangles
-    let mut triangles = {
+    let mesh = TriangleMesh::from_triangles({
         let mut triangles = Vec::new();
         let xres = 32;
         let yres = 32;
@@ -97,14 +98,6 @@ fn main() {
             }
         }
         triangles
-    };
-    let accel = bvh::BVH::from_objects(&mut triangles[..], 3, |tri| {
-        let minimum = tri.0.min(tri.1.min(tri.2));
-        let maximum = tri.0.max(tri.1.max(tri.2));
-        BBox {
-            min: minimum,
-            max: maximum,
-        }
     });
     println!("Scene built.");
 
@@ -118,7 +111,7 @@ fn main() {
         resolution: (512, 512),
         spp: samples_per_pixel as usize,
         camera: cam,
-        scene: (triangles, accel),
+        scene: mesh,
     };
 
     r.render();

src/parse/psy.rs

@@ -1,7 +1,9 @@
-// use renderer::Renderer;
-//
-// use super::DataTree;
+#![allow(dead_code)]
 
-// pub fn parse_frame<'a>(tree: &DataTree) -> Renderer<'a> {
-//    unimplemented!()
-// }
+use renderer::Renderer;
+
+use super::DataTree;
+
+pub fn parse_frame(tree: &DataTree) -> Renderer {
+    unimplemented!()
+}

src/renderer.rs

@@ -1,18 +1,20 @@
+#![allow(dead_code)]
+
 use std::path::Path;
 
 use camera::Camera;
 use halton;
-use math::{Point, fast_logit};
+use math::fast_logit;
 use image::Image;
-use bvh::BVH;
-use triangle;
+use surface;
+use surface::Surface;
 
 pub struct Renderer {
     pub output_file: String,
     pub resolution: (usize, usize),
     pub spp: usize,
     pub camera: Camera,
-    pub scene: (Vec<(Point, Point, Point)>, BVH),
+    pub scene: surface::triangle_mesh::TriangleMesh,
 }
 
 impl Renderer {
@@ -44,39 +46,36 @@ impl Renderer {
                     };
                     ray.id = si as u32;
                     rays.push(ray);
-                    isects.push((false, 0.0, 0.0));
+                    isects.push(surface::SurfaceIntersection::Miss);
                 }
 
                 // Test rays against scene
-                self.scene.1.traverse(&mut rays, &self.scene.0, |tri, rs| {
-                    for r in rs {
-                        if let Some((t, tri_u, tri_v)) = triangle::intersect_ray(r, *tri) {
-                            if t < r.max_t {
-                                isects[r.id as usize] = (true, tri_u, tri_v);
-                                r.max_t = t;
-                            }
-                        }
-                    }
-                });
+                self.scene.intersect_rays(&mut rays, &mut isects);
 
                 // Calculate color based on ray hits
                 let mut r = 0.0;
                 let mut g = 0.0;
                 let mut b = 0.0;
-                for &(hit, u, v) in isects.iter() {
-                    if hit {
-                        r += u;
-                        g += v;
-                        b += (1.0 - u - v).max(0.0);
+                for isect in isects.iter() {
+                    if let &surface::SurfaceIntersection::Hit{
+                            t: _,
+                            pos: _,
+                            nor: _,
+                            space: _,
+                            uv,
+                        } = isect {
+                        r += uv.0;
+                        g += uv.1;
+                        b += (1.0 - uv.0 - uv.1).max(0.0);
                     } else {
                         r += 0.02;
                         g += 0.02;
                         b += 0.02;
                     }
                 }
-                r = 255.0 * sRGB_gamma(r / self.spp as f32);
-                g = 255.0 * sRGB_gamma(g / self.spp as f32);
-                b = 255.0 * sRGB_gamma(b / self.spp as f32);
+                r = 255.0 * srgb_gamma(r / self.spp as f32);
+                g = 255.0 * srgb_gamma(g / self.spp as f32);
+                b = 255.0 * srgb_gamma(b / self.spp as f32);
 
                 // Set pixel color
                 img.set(x, y, (r as u8, g as u8, b as u8));
@@ -102,7 +101,7 @@ fn hash_u32(n: u32, seed: u32) -> u32 {
 }
 
 
-fn sRGB_gamma(n: f32) -> f32 {
+fn srgb_gamma(n: f32) -> f32 {
     if n < 0.0031308 {
         n * 12.92
     } else {
@@ -110,7 +109,7 @@ fn sRGB_gamma(n: f32) -> f32 {
     }
 }
 
-fn sRGB_inv_gamma(n: f32) -> f32 {
+fn srgb_inv_gamma(n: f32) -> f32 {
     if n < 0.04045 {
         n / 12.92
     } else {

src/surface/mod.rs

@@ -0,0 +1,23 @@
+#![allow(dead_code)]
+
+pub mod triangle_mesh;
+
+use ray::Ray;
+use math::{Point, Normal, Matrix4x4};
+
+
+pub enum SurfaceIntersection {
+    Miss,
+    Occlude,
+    Hit {
+        t: f32,
+        pos: Point,
+        nor: Normal,
+        space: Matrix4x4,
+        uv: (f32, f32),
+    },
+}
+
+pub trait Surface {
+    fn intersect_rays(&self, rays: &mut [Ray], isects: &mut [SurfaceIntersection]);
+}

src/surface/triangle_mesh.rs

@@ -0,0 +1,54 @@
+#![allow(dead_code)]
+
+use math::{Point, Normal, Matrix4x4};
+use ray::Ray;
+use triangle;
+use bbox::BBox;
+use bvh::BVH;
+
+use super::{Surface, SurfaceIntersection};
+
+pub struct TriangleMesh {
+    geo: Vec<(Point, Point, Point)>,
+    accel: BVH,
+}
+
+impl TriangleMesh {
+    pub fn from_triangles(mut triangles: Vec<(Point, Point, Point)>) -> TriangleMesh {
+        let accel = BVH::from_objects(&mut triangles[..], 3, |tri| {
+            let minimum = tri.0.min(tri.1.min(tri.2));
+            let maximum = tri.0.max(tri.1.max(tri.2));
+            BBox {
+                min: minimum,
+                max: maximum,
+            }
+        });
+
+        TriangleMesh {
+            geo: triangles,
+            accel: accel,
+        }
+    }
+}
+
+
+impl Surface for TriangleMesh {
+    fn intersect_rays(&self, rays: &mut [Ray], isects: &mut [SurfaceIntersection]) {
+        self.accel.traverse(&mut rays[..], &self.geo, |tri, rs| {
+            for r in rs {
+                if let Some((t, tri_u, tri_v)) = triangle::intersect_ray(r, *tri) {
+                    if t < r.max_t {
+                        isects[r.id as usize] = SurfaceIntersection::Hit {
+                            t: t,
+                            pos: r.orig + (r.dir * t),
+                            nor: Normal::new(0.0, 0.0, 0.0), // TODO
+                            space: Matrix4x4::new(), // TODO
+                            uv: (tri_u, tri_v),
+                        };
+                        r.max_t = t;
+                    }
+                }
+            }
+        });
+    }
+}