Start rendering in the dod version and extract common header

common.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#define WIDTH 1280
+#define HEIGHT 720
+#define HALF_WIDTH (WIDTH * 0.5f)
+#define HALF_HEIGHT (HEIGHT * 0.5f)
+#define MAX_WANDERER_DIM 8
+#define MIN_WANDERER_DIM 3
+#define MIN_ZONE_DIM 30
+#define BG_COLOR (Color){.r = 0xea, .g = 0xf2, .b = 0xe3, .a = 0xff}
+#define FG_COLOR (Color){.r = 0x42, .g = 0x4C, .b = 0x55, .a = 0xff}
+#define ZONE_COLOR (Color){.r = 0xb4, .g = 0x65, .b = 0x4a, .a = 0xff}
+#define WANDERER_COUNT 300000
+#define ZONE_COUNT 5
+#define WANDERER_SLOWDOWN_FACTOR 0.5f
+#define WANDERER_SPEEDUP_FACTOR 2.0f
+#define MSG_BUF_LEN 4096
+#define abs(A) (A < 0 ? A * -1 : A)
+#define min(A, B) (A < B ? A : B)
+#define max(A, B) (A > B ? A : B)