From a7d14a3aabb702c8e040972cd90a20d02808a348 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Sun, 27 Oct 2013 15:49:56 -0400
Subject: [PATCH] add main event loop, init() and display()

---
 source/app.d | 36 +++++++++++++++++++++++++++++++++---
 1 file changed, 33 insertions(+), 3 deletions(-)

diff --git a/source/app.d b/source/app.d
index d3a6123..8d6e6de 100644
--- a/source/app.d
+++ b/source/app.d
@@ -2,6 +2,21 @@ import std.stdio;
 import derelict.sdl2.sdl;
 import derelict.opengl3.gl3;
 
+enum int WIDTH = 800;
+enum int HEIGHT = 600;
+
+void init()
+{
+    glClearColor (1.0, 0.7, 0.0, 0.0);
+    glViewport(0, 0, WIDTH, HEIGHT);
+}
+
+void display(SDL_Window * window)
+{
+    glClear(GL_COLOR_BUFFER_BIT);
+    SDL_GL_SwapWindow(window);
+}
+
 int main()
 {
     DerelictSDL2.load();
@@ -17,8 +32,8 @@ int main()
     SDL_Window * window = SDL_CreateWindow("d-dub-derelict-sdl2-gl3-demo",
                                            SDL_WINDOWPOS_UNDEFINED,
                                            SDL_WINDOWPOS_UNDEFINED,
-                                           800,
-                                           600,
+                                           WIDTH,
+                                           HEIGHT,
                                            SDL_WINDOW_OPENGL);
     SDL_GLContext context = SDL_GL_CreateContext(window);
 
@@ -30,7 +45,22 @@ int main()
 
     DerelictGL3.reload();
 
-    SDL_Delay(2000);
+    init();
+    SDL_Event event;
+    for (;;)
+    {
+        if (SDL_PollEvent(&event))
+        {
+            if (event.type == SDL_QUIT)
+                break;
+            else if (event.type == SDL_KEYDOWN)
+            {
+                if (event.key.keysym.scancode == SDL_SCANCODE_ESCAPE)
+                    break;
+            }
+        }
+        display(window);
+    }
 
     SDL_GL_DeleteContext(context);