Added sphere, circle, cone

src/camera.rs

@@ -0,0 +1,51 @@
+use crate::EPSILON;
+use nalgebra as nm;
+use nalgebra::Matrix4;
+use nalgebra::Point3;
+use nalgebra::Vector3;
+
+#[rustfmt::skip]
+pub const OPENGL_TO_WGPU_MATRIX: Matrix4<f32> = Matrix4::new(
+    1.0, 0.0, 0.0, 0.0,
+    0.0, 1.0, 0.0, 0.0,
+    0.0, 0.0, 0.5, 0.5,
+    0.0, 0.0, 0.0, 1.0,
+);
+
+struct Camera {
+    eye: Point3<f32>,
+    target: Point3<f32>,
+    up: Vector3<f32>,
+    fovy: f32,
+    aspect: f32,
+    znear: f32,
+    zfar: f32,
+}
+
+impl Camera {
+    fn new(
+        eye: Point3<f32>,
+        target: Point3<f32>,
+        up: Vector3<f32>,
+        fovy: f32,
+        aspect: f32,
+    ) -> Self {
+        let znear = EPSILON;
+        let zfar = 1.0 / EPSILON;
+        Camera {
+            eye,
+            target,
+            up,
+            fovy,
+            aspect,
+            znear,
+            zfar,
+        }
+    }
+
+    fn build_mvp_matrix(&self, model: Matrix4<f32>) -> Matrix4<f32> {
+        let view = Matrix4::look_at_lh(&self.eye, &self.target, &self.up);
+        let proj = Matrix4::new_perspective(self.aspect, self.fovy, self.znear, self.zfar);
+        return OPENGL_TO_WGPU_MATRIX * proj * view * model;
+    }
+}