From: Mikko Rasa <tdb@tdb.fi>
Date: Thu, 13 Nov 2014 21:09:33 +0000 (+0200)
Subject: Use a Camera rather than direct matrix manipulation
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgltk.git;a=commitdiff_plain;h=2b1a962fba03a01d641f5b6e2b8d75c6e71e2d40

Use a Camera rather than direct matrix manipulation
---

diff --git a/source/root.cpp b/source/root.cpp
index de24727..f4bad55 100644
--- a/source/root.cpp
+++ b/source/root.cpp
@@ -35,6 +35,9 @@ void Root::init(Graphics::Window *window)
 	lbl_tooltip = 0;
 	tooltip_target = 0;
 
+	camera.set_orthographic(geom.w, geom.h);
+	update_camera();
+
 	update_style();
 
 	if(mouse)
@@ -109,11 +112,9 @@ void Root::tick()
 
 void Root::render() const
 {
-	GL::MatrixStack::projection() = GL::Matrix::ortho_bottomleft(geom.w, geom.h);
-	GL::MatrixStack::modelview() = GL::Matrix();
 	GL::Bind bind_blend(GL::Blend::alpha());
 
-	GL::Renderer renderer(0);
+	GL::Renderer renderer(&camera);
 	Widget::render(renderer);
 }
 
@@ -231,6 +232,19 @@ void Root::get_pointer(int &x, int &y)
 	y = (mouse->get_axis_value(1)*0.5+0.5)*geom.h;
 }
 
+void Root::update_camera()
+{
+	camera.set_position(GL::Vector3(geom.w/2.0f, geom.h/2.0f, geom.h/2.0f));
+	camera.set_depth_clip(geom.h*0.1f, geom.h*0.9f);
+	camera.set_orthographic(geom.w, geom.h);
+}
+
+void Root::on_geometry_change()
+{
+	Panel::on_geometry_change();
+	update_camera();
+}
+
 void Root::on_child_added(Widget &wdg)
 {
 	if(&wdg!=lbl_tooltip)
diff --git a/source/root.h b/source/root.h
index a74065d..b79bca3 100644
--- a/source/root.h
+++ b/source/root.h
@@ -2,6 +2,7 @@
 #define MSP_GLTK_ROOT_H_
 
 #include <sigc++/trackable.h>
+#include <msp/gl/camera.h>
 #include <msp/graphics/window.h>
 #include <msp/input/keyboard.h>
 #include <msp/input/mouse.h>
@@ -32,6 +33,7 @@ private:
 	int pointer_y;
 	Time::TimeStamp tooltip_timeout;
 	Widget *tooltip_target;
+	Msp::GL::Camera camera;
 
 public:
 	/** Creates a Root widget for a window.  The geometry is set to match the
@@ -64,7 +66,9 @@ private:
 	bool character_event(StringCodec::unichar);
 
 	void get_pointer(int &, int &);
+	void update_camera();
 
+	virtual void on_geometry_change();
 	virtual void on_child_added(Widget &);
 };