From 778b1da2b90d2fd88610af7a3df03e181e985992 Mon Sep 17 00:00:00 2001
From: schneider <schneider@blinkenlichts.net>
Date: Mon, 22 Aug 2011 22:27:21 +0200
Subject: [PATCH] added nick_plasma l0adable

---
 firmware/l0dable/nick_plasma.c | 130 +++++++++++++++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 firmware/l0dable/nick_plasma.c

diff --git a/firmware/l0dable/nick_plasma.c b/firmware/l0dable/nick_plasma.c
new file mode 100644
index 0000000..22aeb28
--- /dev/null
+++ b/firmware/l0dable/nick_plasma.c
@@ -0,0 +1,130 @@
+/* nick_plasma.c - provided by Grigori Goronzy <greg@geekmind.org> */
+/*
+    simple plasma with horribly slow code.
+    makes a nice nick animation, though.
+
+    gregg/gnp for camp 2011
+*/
+#include <sysinit.h>
+#include "basic/basic.h"
+#include "lcd/print.h"
+#include "lcd/render.h"
+#include "lcd/display.h"
+
+#include "basic/config.h"
+
+#include "usetable.h"
+
+#define INT_MAX 2147483647
+
+#define BLINK
+
+static short sintab[] = {
+    0 , 3 , 6 , 9 , 12 , 15 , 18 , 21 , 24 , 28 , 31 , 34 , 37 , 40 , 43 ,
+    46 , 48 , 51 , 54 , 57 , 60 , 63 , 65 , 68 , 71 , 73 , 76 , 78 , 81 ,
+    83 , 85 , 88 , 90 , 92 , 94 , 96 , 98 , 100 , 102 , 104 , 106 , 108 ,
+    109 , 111 , 112 , 114 , 115 , 116 , 118 , 119 , 120 , 121 , 122 ,
+    123 , 124 , 124 , 125 , 126 , 126 , 127 , 127 , 127 , 127 , 127 ,
+    127 , 127 , 127 , 127 , 127 , 127 , 126 , 126 , 125 , 124 , 124 , 123
+        , 122 , 121 , 120 , 119 , 118 , 117 , 115 , 114 , 112 , 111 , 109 ,
+    108 , 106 , 104 , 102 , 100 , 99 , 97 , 94 , 92 , 90 , 88 , 86 , 83 ,
+    81 , 78 , 76 , 73 , 71 , 68 , 65 , 63 , 60 , 57 , 54 , 52 , 49 , 46 ,
+    43 , 40 , 37 , 34 , 31 , 28 , 25 , 22 , 18 , 15 , 12 , 9 , 6 , 3 ,
+    0 , -2 , -6 , -9 , -12 , -15 , -18 , -21 , -24 , -27 , -30 , -33 ,
+    -36 , -39 , -42 , -45 , -48 , -51 , -54 , -57 , -60 , -62 , -65 ,
+    -68 , -70 , -73 , -76 , -78 , -81 , -83 , -85 , -88 , -90 , -92 ,
+    -94 , -96 , -98 , -100 , -102 , -104 , -106 , -107 , -109 , -111 ,
+    -112 , -114 , -115 , -116 , -118 , -119 , -120 , -121 , -122 , -123 ,
+    -124 , -124 , -125 , -126 , -126 , -127 , -127 , -127 , -127 , -127 ,
+    -127 , -127 , -127 , -127 , -127 , -127 , -126 , -126 , -125 , -124 ,
+    -124 , -123 , -122 , -121 , -120 , -119 , -118 , -117 , -115 , -114 ,
+    -113 , -111 , -109 , -108 , -106 , -104 , -103 , -101 , -99 , -97 ,
+    -95 , -92 , -90 , -88 , -86 , -83 , -81 , -79 , -76 , -74 , -71 ,
+    -68 , -66 , -63 , -60 , -57 , -55 , -52 , -49 , -46 , -43 , -40 ,
+    -37 , -34 , -31 , -28 , -25 , -22 , -19 , -16 , -12 , -9 , -6 , -3 ,
+};
+
+// 4x4 ordered dithering
+// smoother, but actually *too* smooth for our little display
+static unsigned char dithertab4[] = {
+    1, 9, 3, 11,
+    13, 5, 15, 7,
+    4, 12, 2, 10,
+    16, 8, 14, 6
+};
+
+// 2x2 ordered dithering
+static unsigned char dithertab2[] = {
+    1, 3,
+    4, 2
+};
+
+// integer square root
+static unsigned isqrt(unsigned val)
+{
+    unsigned temp, g = 0, b = 0x8000, bshft = 15;
+    do {
+        if (val >= (temp = (((g << 1) + b)<<bshft--))) {
+           g += b;
+           val -= temp;
+        }
+    } while (b >>= 1);
+    return g;
+}
+
+
+static void plasma(unsigned int t)
+{
+   int i, j;
+
+   for (j = 0; j < RESY; j++)
+       for (i = 0; i < RESX; i++) {
+           int sin1 = 128 + sintab[(t+i*4) % 256];
+           int cx = RESX/2 + sintab[(INT_MAX-t) % 256] / 4;
+           int cy = RESY/2 + sintab[(INT_MAX-t+64) % 256] / 4;
+           int dx = cx - i;
+           int dy = cy - j;
+           int sin2 = 128 + sintab[(isqrt(dx*dx + dy*dy)*8) % 256];
+           int sin3 = (sin1 + sin2) / 2;
+           unsigned char pix = ((sin3 + 32) / 64) >= dithertab2[(j%2)*2 + (i%2)];
+           lcdSetPixel(i, j, pix);
+       }
+}
+
+void ram(void)
+{
+    unsigned int t = 0;
+    int px, py;
+
+    // set up font and nick position
+    setExtFont(GLOBAL(nickfont));
+	px = DoString(0, 0, GLOBAL(nickname));
+    px = (RESX-px) / 2;
+    if (px < 0)
+        px = 0;
+    py = (RESY - getFontHeight()) / 2;
+
+    // display plasma
+    for (;;) {
+        plasma(t++);
+        DoString(px, py, GLOBAL(nickname));
+        lcdRefresh();
+
+#ifdef BLINK
+        // blink some LEDs
+        if ((t % 30) == 0) {
+            gpioSetValue(RB_LED2, 1);
+            gpioSetValue(RB_LED0, 1);
+        }
+        if ((t % 30) == 2) {
+            gpioSetValue(RB_LED2, 0);
+            gpioSetValue(RB_LED0, 0);
+        }
+#endif
+
+        char key = getInputRaw();
+        if (key == BTN_ENTER)
+            return;
+    }
+
+}