Implement Video::GetWidth() and Video::GetHeight().

src/video.cpp

@@ -54,3 +54,18 @@ void Video::Clear()
     glMatrixMode(GL_MODELVIEW);
     glLoadIdentity();
 }
+
+int Video::GetWidth()
+{
+    GLint v[4];
+    glGetIntegerv(GL_VIEWPORT, v);
+    return v[2];
+}
+
+int Video::GetHeight()
+{
+    GLint v[4];
+    glGetIntegerv(GL_VIEWPORT, v);
+    return v[3];
+}
+

src/video.h

@@ -17,6 +17,8 @@ class Video
 public:
     static void Setup(int width, int height);
     static void Clear();
+    static int GetWidth();
+    static int GetHeight();
 };
 
 #endif // __DH_VIDEO_H__