diff options
Diffstat (limited to 'src/renderer.rs')
| -rw-r--r-- | src/renderer.rs | 32 |
1 files changed, 28 insertions, 4 deletions
diff --git a/src/renderer.rs b/src/renderer.rs index 7815673..f712939 100644 --- a/src/renderer.rs +++ b/src/renderer.rs @@ -1,12 +1,21 @@ -use crate::calculus::calculus::Vec3; -use crate::global::{CAMERA_CENTER, FOCAL_LENGTH, VIEWPORT_HEIGHT, VIEWPORT_WIDTH}; +use crate::calculus::calculus::{Ray, Vec3}; +use crate::global::{DisplayBuffer, Pixel, CAMERA_CENTER, FOCAL_LENGTH, IMG_HEIGHT, IMG_WIDTH, VIEWPORT_HEIGHT, VIEWPORT_WIDTH}; -fn render() { +fn ray_color(ray: &Ray) -> Vec3 { + let unit_direction = ray.direction.unit(); + let a = 0.5 * (unit_direction.y + 1.0); + let vec_1 = Vec3 { x:1.0, y: 1.0, z: 1.0 }; + let vec_2 = Vec3 { x: 0.5, y: 0.7, z: 1.0 }; + vec_1.scalar_mul(1.0 - a) + .add(&vec_2.scalar_mul(a)) +} + +pub fn render(display_buffer: &mut DisplayBuffer) { let viewport_hor_vector = Vec3{ x: VIEWPORT_WIDTH as f32, y: 0.0, z: 0.0 }; let viewport_ver_vector = Vec3 { x: 0.0, y: -1f32 * VIEWPORT_HEIGHT as f32, z: 0.0 }; let delta_pixel_u = viewport_hor_vector.scalar_mul(1.0 / VIEWPORT_WIDTH as f32); - let delta_u = viewport_ver_vector.scalar_mul(1.0 / VIEWPORT_WIDTH as f32); + let delta_pixel_v = viewport_ver_vector.scalar_mul(1.0 / VIEWPORT_WIDTH as f32); let viewport_upper_left = CAMERA_CENTER .sub(&Vec3 { x: 0f32, y: 0f32, z: FOCAL_LENGTH}) @@ -15,4 +24,19 @@ fn render() { let pixel_upper_left = viewport_upper_left.add( &delta_pixel_u.add(&delta_pixel_u).scalar_mul(0.5) ); + + (0..IMG_HEIGHT).for_each(|j| { + (0..IMG_WIDTH).for_each(|i| { + let pixel_center = pixel_upper_left + .add(&delta_pixel_u.scalar_mul(i as f32)) + .add(&delta_pixel_v.scalar_mul(j as f32)); + let ray_direction = pixel_center.sub(&CAMERA_CENTER); + let ray = Ray { + origin: &CAMERA_CENTER, + direction: &ray_direction, + }; + let Vec3 {x, y, z} = ray_color(&ray); + display_buffer[j][i] = Pixel::from_frac(x, y, z); + }) + }) }
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