From c90cc1f31a285ed2ef21a21b5610837425d1ef51 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Thu, 13 Nov 2014 23:08:14 +0200
Subject: [PATCH] Add orthographic mode to Camera

---
 source/camera.cpp | 15 ++++++++++++++-
 source/camera.h   |  2 ++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/source/camera.cpp b/source/camera.cpp
index fca3ea33..a0c89e0e 100644
--- a/source/camera.cpp
+++ b/source/camera.cpp
@@ -7,6 +7,7 @@ namespace GL {
 
 Camera::Camera():
 	fov(Geometry::Angle<float>::from_turns(0.125)),
+	height(0),
 	aspect(4.0/3.0),
 	clip_near(0.1),
 	clip_far(10),
@@ -26,6 +27,15 @@ void Camera::set_field_of_view(const Geometry::Angle<float> &f)
 	update_projection_matrix();
 }
 
+void Camera::set_orthographic(float w, float h)
+{
+	fov = Geometry::Angle<float>::zero();
+	height = h;
+	if(w)
+		aspect = w/h;
+	update_projection_matrix();
+}
+
 void Camera::set_aspect(float a)
 {
 	aspect = a;
@@ -101,7 +111,10 @@ void Camera::update_projection_matrix()
 	float right = frustum_w*(frustum_x+1.0f);
 	float bottom = frustum_h*(frustum_y-1.0f);
 	float top = frustum_h*(frustum_y+1.0f);
-	proj_matrix = Matrix::frustum(left, right, bottom, top, clip_near, clip_far);
+	if(fov>Geometry::Angle<float>::zero())
+		proj_matrix = Matrix::frustum(left, right, bottom, top, clip_near, clip_far);
+	else
+		proj_matrix = Matrix::ortho(left, right, bottom, top, clip_near, clip_far);
 }
 
 void Camera::update_object_matrix()
diff --git a/source/camera.h b/source/camera.h
index bfcc2987..9a525e6b 100644
--- a/source/camera.h
+++ b/source/camera.h
@@ -11,6 +11,7 @@ class Camera
 {
 private:
 	Geometry::Angle<float> fov;
+	float height;
 	float aspect;
 	// Some compilers have "near" and "far" keywords
 	float clip_near;
@@ -28,6 +29,7 @@ public:
 	Camera();
 
 	void set_field_of_view(const Geometry::Angle<float> &);
+	void set_orthographic(float, float);
 	void set_aspect(float);
 	void set_depth_clip(float, float);
 	void set_frustum_axis(float, float);
-- 
2.45.2