X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fcamera.cpp;fp=source%2Fcamera.cpp;h=274604f27f32e74833925d29828ec1628d22f36a;hb=fac4decfa4744ac6dc7f13c0348b0ec1ec80f6a4;hp=a3ab730d98ddd06ed167a8a0bd739b0e56554890;hpb=c87860db3b23a98eda1adfe59acddffdb6eb8420;p=libs%2Fgl.git

diff --git a/source/camera.cpp b/source/camera.cpp
index a3ab730d..274604f2 100644
--- a/source/camera.cpp
+++ b/source/camera.cpp
@@ -10,6 +10,8 @@ Camera::Camera():
 	aspect(4.0/3.0),
 	clip_near(0.1),
 	clip_far(10),
+	frustum_x(0),
+	frustum_y(0),
 	position(0, 0, 0),
 	look_dir(0, 0, -1),
 	up_dir(0, 1, 0)
@@ -31,6 +33,12 @@ void Camera::set_depth_clip(float n, float f)
 	clip_far = f;
 }
 
+void Camera::set_frustum_axis(float x, float y)
+{
+	frustum_x = x;
+	frustum_y = y;
+}
+
 void Camera::set_position(const Vector3 &p)
 {
 	position = p;
@@ -91,7 +99,13 @@ Vector4 Camera::unproject(const Vector4 &p) const
 
 void Camera::apply() const
 {
-	MatrixStack::projection() = Matrix::perspective(fov, aspect, clip_near, clip_far);
+	float frustum_h = tan(fov/2.0f)*clip_near;
+	float frustum_w = frustum_h*aspect;
+	float left = frustum_w*(frustum_x-1.0f);
+	float right = frustum_w*(frustum_x+1.0f);
+	float bottom = frustum_h*(frustum_y-1.0f);
+	float top = frustum_h*(frustum_y+1.0f);
+	MatrixStack::projection() = Matrix::frustum(left, right, bottom, top, clip_near, clip_far);
 	MatrixStack::modelview() = matrix;
 }