X-Git-Url: http://git.localhorst.tv/?a=blobdiff_plain;f=src%2Fcamera.cpp;h=8804d115b36574cdab2618fb441f0d1a50958696;hb=4d0ef1687987a0801469c7262f81efd36636605a;hp=8a3a8a1bfe3b7559b8d4c1cd42ee8c4adaa85933;hpb=81531352f0af10ef357e82595098fa596795f000;p=blank.git

diff --git a/src/camera.cpp b/src/camera.cpp
index 8a3a8a1..8804d11 100644
--- a/src/camera.cpp
+++ b/src/camera.cpp
@@ -13,6 +13,7 @@ Camera::Camera()
 , near_clip(0.1f)
 , far_clip(100.0f)
 , projection(glm::perspective(fov, aspect, near_clip, far_clip))
+, view(glm::inverse(Transform()))
 , vp(projection) {
 
 }
@@ -51,10 +52,20 @@ void Camera::Clip(float near, float far) {
 	UpdateProjection();
 }
 
+Ray Camera::Aim() const {
+	const glm::mat4 inv_vp(glm::inverse(vp));
+	glm::vec4 from = inv_vp * glm::vec4(0.0f, 0.0f, -1.0f, 1.0f);
+	from /= from.w;
+	glm::vec4 to = inv_vp * glm::vec4(0.0f, 0.0f, 1.0f, 1.0f);
+	to /= to.w;
+	return Ray{ glm::vec3(from), glm::normalize(glm::vec3(to - from)) };
+}
+
 
 void Camera::Update(int dt) {
 	FPSController::Update(dt);
-	vp = projection * glm::inverse(Transform());
+	view = glm::inverse(Transform());
+	vp = projection * view;
 }
 
 void Camera::UpdateProjection() {