From aacc63d58680fb67637eaab37891af584f5d96d8 Mon Sep 17 00:00:00 2001
From: Adam Greenwood-Byrne <adam@isometim.es>
Date: Sat, 17 Apr 2021 21:40:09 +0100
Subject: [PATCH] Added examples/wgt39.c - mouse trails

---
 part12-wgt/samples/wgt39.c | 101 +++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 part12-wgt/samples/wgt39.c

diff --git a/part12-wgt/samples/wgt39.c b/part12-wgt/samples/wgt39.c
new file mode 100644
index 0000000..48607a1
--- /dev/null
+++ b/part12-wgt/samples/wgt39.c
@@ -0,0 +1,101 @@
+#include "include/wgt.h"
+#include "include/mem.h"
+#include "include/multicore.h"
+
+// ######## REQUIRED FUNCTIONS ########
+
+unsigned long state0 = 1000;
+unsigned long state1 = 2000;
+
+unsigned long rand(void)
+{
+    unsigned long s1 = state0;
+    unsigned long s0 = state1;
+
+    state0 = s0;
+    s1 ^= s1 << 23;
+    s1 ^= s1 >> 17;
+    s1 ^= s0;
+    s1 ^= s0 >> 26;
+    state1 = s1;
+
+    return state0 + state1;
+}
+
+// ######## STUB FUNCTIONS ########
+
+unsigned int kb = 0;
+
+unsigned int kbhit(void) {
+    kb++;
+    return kb / 500;
+}
+
+void getch(void) {
+    wait_msec(0x500000);
+    kb = 0;
+}
+
+// ######## WGT EXAMPLES ########
+
+void wgt39()
+{
+  int i;
+  int px[256], py[256];
+  color p[256];
+  int numpix;
+
+  set_clock_rate(get_max_clock());
+  mem_init();
+  vga256 ();			/* Initialize graphics mode */
+
+  start_core2(minit);           // Start the comms engine (core 2)
+  while (!comms_up);            // Wait for comms up
+
+  numpix = 255;
+
+  extern unsigned char _binary_bin_wgt1_pal_start[];
+  wloadpalette (&_binary_bin_wgt1_pal_start[0], p);
+  wsetpalette (0, 255, p);
+
+  for (i = 0; i < 256; i++)
+    {
+     px[i] = 0;
+     py[i] = 0;
+    }
+
+  do {
+    wsetcolor (vgapal[0]);
+    wait_msec(0x3E9F); // wait for retrace (ish)
+
+    for (i = numpix; i >= 1; i--)
+      {
+       wfastputpixel (px[i], py[i]);
+       wfastputpixel (319 - px[i], 199 - py[i]);
+       px[i] = px[i-1];
+       py[i] = py[i-1];
+      }
+
+   wsetcolor (vgapal[0]);
+   wfastputpixel (px[0], py[0]);
+   wfastputpixel (319 - px[0], 199 - py[0]);
+
+   px[0] = mx;
+   py[0] = my;
+
+   for (i = 0; i < numpix; i++)
+     {
+      wsetcolor (vgapal[i]);
+      wfastputpixel (px[i], py[i]);
+      wfastputpixel (319 - px[i], 199 - py[i]);
+     }
+  } while (!but);
+
+  mdeinit ();                   /* Deinitialize the mouse handler */
+}
+
+void main()
+{
+    wgt39();
+    while (1);
+}