Naive BVH working + camera simple camera rotation

1 files changed, 19 insertions, 1 deletions

diff --git a/src/camera.cpp b/src/camera.cpp
index ff09e20..917cb4e 100644
--- a/src/camera.cpp
+++ b/src/camera.cpp
@@ -10,7 +10,7 @@ camera::camera(
         float aspect_ratio,
         float aperture,
         float focus_dist
-    ) : position(position), lens_radius(aperture / 2.0), fov(v_fov), focus_distance(focus_dist) {
+    ) : position(position), lens_radius(aperture / 2.0), fov(v_fov), focus_distance(focus_dist), aspect_ratio(aspect_ratio) {
 
     forward = (target - position).unit();
     right = forward.cross(vec3{ 0.0, 1.0, 0.0 }).unit();
@@ -27,6 +27,8 @@ camera::camera(
 }
 
 void camera::set_aspect_ratio(float aspect_ratio) {
+    aspect_ratio = aspect_ratio;
+
     auto h = tan(deg_to_rad(fov) / 2.0);
     auto viewport_height = 2.0 * h;
     auto viewport_width = viewport_height * aspect_ratio;
@@ -41,3 +43,19 @@ void camera::move(vec3 v) {
     position += v;
     first_pixel = position - horizontal / 2.0 - vertical / 2.0 + focus_distance * forward;
 }
+
+void camera::rotate_y(float theta) {
+    forward.x = forward.x * cos(theta) - forward.z * sin(theta);
+    forward.z = forward.x * sin(theta) + forward.z * cos(theta);
+
+    right = forward.cross(vec3{ 0.0, 1.0, 0.0 }).unit();
+    up = right.cross(forward).unit();
+
+    auto h = tan(deg_to_rad(fov) / 2.0);
+    auto viewport_height = 2.0 * h;
+    auto viewport_width = viewport_height * aspect_ratio;
+
+    horizontal  = focus_distance * viewport_width * right;
+    vertical    = focus_distance * viewport_height * up;
+    first_pixel = position - horizontal / 2.0 - vertical / 2.0 + focus_distance * forward;
+}