Slow down camera movement when pressing shift

1 files changed, 6 insertions, 2 deletions

diff --git a/src/plugins/viewer.c b/src/plugins/viewer.c
index ba699cc..08e4d57 100644
--- a/src/plugins/viewer.c
+++ b/src/plugins/viewer.c
@@ -57,6 +57,7 @@ typedef struct CameraCommand {
   bool CameraMoveRight    : 1;
   bool CameraMoveForward  : 1;
   bool CameraMoveBackward : 1;
+  bool CameraSlow         : 1; // When true, move more slowly.
   bool CameraIsRotating : 1; // When true, subsequent mouse movements cause the
   // camera to rotate.
 } CameraCommand;
@@ -203,6 +204,7 @@ static CameraCommand make_camera_command_from_input(GfxApp* app) {
       .CameraMoveRight    = gfx_app_is_key_pressed(app, KeyD),
       .CameraMoveForward  = gfx_app_is_key_pressed(app, KeyW),
       .CameraMoveBackward = gfx_app_is_key_pressed(app, KeyS),
+      .CameraSlow         = gfx_app_is_key_pressed(app, KeyLShift),
       .CameraIsRotating   = gfx_app_is_mouse_button_pressed(app, LMB),
   };
 }
@@ -218,8 +220,10 @@ static void update_camera(
                    (R)(command.CameraMoveRight ? 1 : 0);
   const R move_y = (R)(command.CameraMoveForward ? 1 : 0) +
                    (R)(command.CameraMoveBackward ? -1 : 0);
-  const vec2 translation = vec2_scale(
-      vec2_normalize(vec2_make(move_x, move_y)), controller->camera_speed * dt);
+  const R    speed_factor = command.CameraSlow ? 0.3 : 1.0;
+  const vec2 translation  = vec2_scale(
+      vec2_normalize(vec2_make(move_x, move_y)),
+      controller->camera_speed * speed_factor * dt);
   spatial3_move_right(camera, translation.x);
   spatial3_move_forwards(camera, translation.y);