From 3c22fed1feaba0e2c63896ea87928206f597087d Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Thu, 26 Jun 2014 11:15:34 -0400
Subject: [PATCH] GUI: add resize() and draw()

---
 src/gui/GUI.cc | 35 +++++++++++++++++++++++++++++++++--
 src/gui/GUI.h  |  2 ++
 2 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/src/gui/GUI.cc b/src/gui/GUI.cc
index 546a7c2..ce56e2f 100644
--- a/src/gui/GUI.cc
+++ b/src/gui/GUI.cc
@@ -100,8 +100,8 @@ namespace jes
 
     int GUI::run()
     {
-        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-        SDL_GL_SwapWindow(m_window);
+        resize();
+        draw();
 
         SDL_Event event;
         while (SDL_WaitEvent(&event))
@@ -113,8 +113,39 @@ namespace jes
                 if (event.key.keysym.sym == SDLK_ESCAPE)
                     break;
             }
+            else if (event.type == SDL_WINDOWEVENT)
+            {
+                switch (event.window.event)
+                {
+                case SDL_WINDOWEVENT_EXPOSED:
+                    draw();
+                    break;
+                case SDL_WINDOWEVENT_RESIZED:
+                    resize();
+                    draw();
+                    break;
+                }
+            }
         }
 
         return 0;
     }
+
+    void GUI::resize()
+    {
+        GLint viewport_size[2];
+        SDL_GetWindowSize(m_window, &viewport_size[0], &viewport_size[1]);
+        glViewport(0, 0, viewport_size[0], viewport_size[1]);
+        for (int i = 0; i < PROGRAM_COUNT; i++)
+        {
+            m_programs[i]->use();
+            glUniform2iv(m_programs[i]->get_uniform("viewport_size"), 1, &viewport_size[0]);
+        }
+    }
+
+    void GUI::draw()
+    {
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+        SDL_GL_SwapWindow(m_window);
+    }
 }
diff --git a/src/gui/GUI.h b/src/gui/GUI.h
index 9b466c5..45b36fa 100644
--- a/src/gui/GUI.h
+++ b/src/gui/GUI.h
@@ -22,6 +22,8 @@ namespace jes
         int run();
     protected:
         bool load_shaders();
+        void resize();
+        void draw();
 
         SDL_Window * m_window;
         FontManagerRef m_font_manager;