Move some common calculations to base classes

[libs/vr.git] / source / stereocombiner.cpp

diff --git a/source/stereocombiner.cpp b/source/stereocombiner.cpp
index c24a937484aae3c162de692dee4d143959cc2176..75c788997e770fa0f1a7340d03b578e969062d51 100644 (file)
--- a/source/stereocombiner.cpp
+++ b/source/stereocombiner.cpp
@@ -1,5 +1,8 @@
+#include <algorithm>
 #include "stereocombiner.h"
 
+using namespace std;
+
 namespace Msp {
 namespace VR {
 
@@ -10,5 +13,32 @@ StereoCombiner::StereoCombiner():
        frustum_skew(0.0f)
 { }
 
+void StereoCombiner::configure_eye_frustums(const Frustum &left_frustum, const Frustum &right_frustum)
+{
+       float vertical = max(max(left_frustum.top, -left_frustum.bottom), max(right_frustum.top, -right_frustum.bottom));
+       fov = Geometry::atan<float>(vertical)*2.0f;
+
+       float inner = max(left_frustum.right, -right_frustum.left);
+       float outer = max(-left_frustum.left, right_frustum.right);
+       frustum_skew = (inner-outer)/(inner+outer);
+
+       render_aspect = (inner+outer)/(vertical*2);
+}
+
+
+StereoCombiner::Frustum::Frustum():
+       left(-1),
+       right(1),
+       bottom(-1),
+       top(1)
+{ }
+
+StereoCombiner::Frustum::Frustum(float l, float r, float b, float t):
+       left(l),
+       right(r),
+       bottom(b),
+       top(t)
+{ }
+
 } // namespace VR
 } // namespace Msp