From 71b5e8d4b1f3ee933c8f716368a8bd5883dacd6f Mon Sep 17 00:00:00 2001
From: James Grogan <grogan.ox@gmail.com>
Date: Mon, 14 Nov 2022 16:07:13 +0000
Subject: [PATCH] Playing with projections.

---
 src/graphics/opengl/OpenGlPainter.cpp         | 33 +++++++++++--------
 .../x11/XcbGlWindowInterface.cpp              |  6 ++++
 2 files changed, 25 insertions(+), 14 deletions(-)

diff --git a/src/graphics/opengl/OpenGlPainter.cpp b/src/graphics/opengl/OpenGlPainter.cpp
index 32f9926..df67c2a 100644
--- a/src/graphics/opengl/OpenGlPainter.cpp
+++ b/src/graphics/opengl/OpenGlPainter.cpp
@@ -18,15 +18,20 @@ void OpenGlPainter::paint(DrawingContext* context)
     auto surface = context->getSurface();
     const auto width = double(surface->getWidth());
     const auto height = double(surface->getHeight());
-
-    std::cout << "Painting into width " << width << " and height " << height << std::endl;
-
     const auto num_mesh = context->getScene()->getNumMeshes();
 
     glClearColor(1.0, 1.0, 1.0, 0.0);
     glClear(GL_COLOR_BUFFER_BIT);
 
-    //glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
+    glViewport(0, 0, width, height);
+    glOrtho(0, width, 0, height, -1.0, 1.0);
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+
+    //glMatrixMode(GL_MODELVIEW);
+   //glLoadIdentity();
+
+    std::cout << "Bounds are : " << width << " | " << height << std::endl;
 
     for (std::size_t idx=0; idx<num_mesh; idx++)
     {
@@ -44,23 +49,23 @@ void OpenGlPainter::paint(DrawingContext* context)
             glColor3f(r, g, b);
 
             glBegin(GL_TRIANGLES);
-            double x0 = 2.0*face[0].getX() / width - 1.0;
-            double y0 = 1.0 - 2.0*face[0].getY() / height;
+            double x0 = face[0].getX();
+            double y0 = height -face[0].getY();
 
-            double x1 = 2.0*face[1].getX() / width - 1.0;
-            double y1 = 1.0  - 2.0*face[1].getY() / height;
+            double x1 = face[1].getX();
+            double y1 = height -face[1].getY();
 
-            double x2 = 2.0*face[2].getX() / width - 1.0;
-            double y2 = 1.0  - 2.0*face[2].getY() / height;
+            double x2 = face[2].getX();
+            double y2 = height -face[2].getY();
 
             glVertex3f(x0, y0, 0);
             glVertex3f(x1, y1, 0);
             glVertex3f(x2, y2, 0);
 
-            // std::cout << "Verts0| " << x0 << " | " << y0 << " | "<< std::endl;
-            // std::cout << "Verts1| " << x1 << " | " << y1 << " | "<< std::endl;
-            // std::cout << "Verts2| " << x2 << " | " << y2 << " | "<< std::endl;
-            // std::cout << "****************" << std::endl;
+            std::cout << "Verts0| " << x0 << " | " << y0 << " | "<< std::endl;
+            std::cout << "Verts1| " << x1 << " | " << y1 << " | "<< std::endl;
+            std::cout << "Verts2| " << x2 << " | " << y2 << " | "<< std::endl;
+            std::cout << "****************" << std::endl;
 
             glEnd();
 
diff --git a/src/windows/ui_interfaces/x11/XcbGlWindowInterface.cpp b/src/windows/ui_interfaces/x11/XcbGlWindowInterface.cpp
index 40e0868..abc6d1e 100644
--- a/src/windows/ui_interfaces/x11/XcbGlWindowInterface.cpp
+++ b/src/windows/ui_interfaces/x11/XcbGlWindowInterface.cpp
@@ -60,6 +60,12 @@ bool XcbGlWindowInterface::initialize(xcb_window_t window)
 void XcbGlWindowInterface::resizeViewPort(unsigned width, unsigned height)
 {
     glViewport(0, 0, width, height);
+    glOrtho(0, width, 0, height, -1.0, 1.0);
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+
+    //glMatrixMode(GL_MODELVIEW);
+
 }
 
 void XcbGlWindowInterface::destroyWindow()