tvdos bootable disk image builder

assets/disk0/home/graphicstest.js

@@ -0,0 +1,43 @@
+var w = 560;
+var h = 448;
+var hwoff = 1048576;
+
+function inthash(x) {
+    x = ((x >> 16) ^ x) * 0x45d9f3b;
+    x = ((x >> 16) ^ x) * 0x45d9f3b;
+    x = (x >> 16) ^ x;
+    return x;
+}
+
+var rng = Math.floor(Math.random() * 2147483647) + 1;
+
+while (!con.hitterminate()) {
+
+    var tstart = sys.nanoTime();
+
+    for (var y = 0; y < 360; y++) {
+        for (var x = 0; x < w; x++) {
+            var palnum = 20 * Math.floor(y / 30) + Math.floor(x / 28);
+            sys.poke(-(y * w + x + 1) - hwoff, inthash(palnum + rng));
+        }
+    }
+
+    for (var y = 360; y < h; y++) {
+        for (var x = 0; x < w; x++) {
+            var palnum = 240 + Math.floor(x / 35);
+            sys.poke(-(y * w + x + 1) - hwoff, palnum);
+        }
+    }
+
+    /*for (var k = 0; k < 2560; k++) {
+        sys.poke(-(253952 + k + 1) - hwoff, -2); // transparent
+        sys.poke(-(253952 + 2560 + k + 1) - hwoff, -1); // white
+        /*sys.poke(-(253952 + 2560*2 + k + 1) - hwoff, Math.round(Math.random() * 255));*/
+    //}*/
+
+    rng = inthash(rng);
+
+    var tend = sys.nanoTime();
+
+    println("Apparent FPS: " + (1000000000 / (tend - tstart)));
+}