Restored some of the rendering

include/dawn/display/render.h

@@ -11,6 +11,6 @@
  * how the renderer is currently set up.
  */
 typedef struct {
-  /** Resolution (in pixels) */
-  int32_t width, height;
+  /** Resolution (in pixels). Floats to allow subpixels in future. */
+  float width, height;
 } render_t;