From 1fbbf873ce0993536eafe9f9f01eb0ca24fececa Mon Sep 17 00:00:00 2001
From: Ash Tyndall <git@atyndall.net>
Date: Sun, 9 Oct 2011 19:14:08 +0800
Subject: [PATCH]

---
 scene.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/scene.c b/scene.c
index 7e72ae6..4fea15a 100644
--- a/scene.c
+++ b/scene.c
@@ -463,7 +463,7 @@ void makeMenu() {
  * @param width New width
  * @param height New height
  */
-void windowReshape(int width, int height) {
+void windowReshape(int w, int h) {
   /*glViewport(0, 0, (GLsizei)width, (GLsizei)height);
   printf("Width: %d, height: %d\n", width, height);
   glMatrixMode(GL_PROJECTION);
@@ -476,6 +476,18 @@ void windowReshape(int width, int height) {
   GLdouble a = (GLfloat)height/(GLfloat)width;
   GLdouble fov = 60;
   glFrustum( -a*near*tan(fov/2),  a*near*tan(fov/2),  -a*near*tan(fov/2),  a*near*tan(fov/2), near, far  )*/
+  glViewport(0, 0, (GLsizei) w, (GLsizei) h); // what's GLsizei? Why is it called inside glViewPort?
+   glMatrixMode(GL_PROJECTION); // is it necessary to reset the projection matrix?
+   glLoadIdentity();
+   if (w <= h)  // is this calculation universal, could I use it on another program?
+      glOrtho(-5.0, 5.0, -5.0*(GLfloat)h/(GLfloat)w,
+               5.0*(GLfloat)h/(GLfloat)w, -5.0, 5.0);
+
+   else
+      glOrtho(-5.0*(GLfloat)w/(GLfloat)h,
+               5.0*(GLfloat)w/(GLfloat)h, -5.0, 5.0, -5.0, 5.0);
+   glMatrixMode(GL_MODELVIEW); // why do I set to GL_MODELVIEW at the end?
+   glLoadIdentity(); // why does it get a reset?
 }
 
 /**
-- 
2.20.1