From 2d07f6fcc0712f6e5c0fb01a3d3ed0ec0cf27d66 Mon Sep 17 00:00:00 2001
From: Toby Jaffey <toby@ringtailsoftware.co.uk>
Date: Thu, 11 Dec 2025 23:53:43 +0000
Subject: [PATCH] Munching squares

---
 apps/gfx/gfx.c | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/apps/gfx/gfx.c b/apps/gfx/gfx.c
index d7eebf2..258913a 100644
--- a/apps/gfx/gfx.c
+++ b/apps/gfx/gfx.c
@@ -1,21 +1,24 @@
 #include "uvm32_target.h"
 
-uint32_t *framebuffer = (uint32_t *)UVM32_EXTRAM_BASE;
+uint32_t* framebuffer = (uint32_t*)UVM32_EXTRAM_BASE;
 #define WIDTH 800
 #define HEIGHT 600
 
 void main(void) {
-    uint32_t col = 0x000000FF;
-    uint8_t c = 0;
+    uint8_t r = 0, g = 0, b = 0;
     uint32_t framecount = 0;
-    while(1) {
-        for (int y=0;y<HEIGHT;y++) {
-            for (int x=0;x<WIDTH;x++) {
-                framebuffer[y*WIDTH+x] = col;
+    while (1) {
+        for (int y = 0; y < HEIGHT; y++) {
+            for (int x = 0; x < WIDTH; x++) {
+                r = ((x + framecount) ^ y);
+                g = (x ^ (y + framecount));
+                b = (x ^ y);
+                r += framecount;
+                g += framecount * 2;
+                b += framecount * 5;
+                framebuffer[y * WIDTH + x] = (r << 24) | (g << 16) | (b << 8) | 0xFF;
             }
         }
-        col = (c << 24) | (c << 16) | (c<<8) | 0xFF;
-        c++;
         printdec(framecount++);
         println("");
     }