fix index, add another renderer

2 files changed, 17 insertions, 1 deletions

diff --git a/src/main.rs b/src/main.rs
index 65dc271..6e1b9e6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -25,7 +25,7 @@ fn test_render(data: &mut DisplayBuffer) {
             let g = j as f32 / IMG_HEIGHT as f32;
             let b = 0.0f32;
 
-            data[i][j] = Pixel::from_frac(r, g, b);
+            data[j][i] = Pixel::from_frac(r, g, b);
         })
     });
 }
diff --git a/src/renderer.rs b/src/renderer.rs
index 28dbb36..7815673 100644
--- a/src/renderer.rs
+++ b/src/renderer.rs
@@ -1,2 +1,18 @@
+use crate::calculus::calculus::Vec3;
+use crate::global::{CAMERA_CENTER, FOCAL_LENGTH, VIEWPORT_HEIGHT, VIEWPORT_WIDTH};
+
 fn render() {
+    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 viewport_upper_left = CAMERA_CENTER
+        .sub(&Vec3 { x: 0f32, y: 0f32, z: FOCAL_LENGTH})
+        .sub(&viewport_hor_vector.scalar_mul(0.5))
+        .sub(&viewport_ver_vector.scalar_mul(0.5));
+    let pixel_upper_left = viewport_upper_left.add(
+        &delta_pixel_u.add(&delta_pixel_u).scalar_mul(0.5)
+    );
 }
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