From ccbd205dcbe6283484556ac0f2d67d7624c98646 Mon Sep 17 00:00:00 2001
From: Joel Bodenmann <joel@unormal.org>
Date: Thu, 2 May 2013 01:53:22 +0200
Subject: Revert "fixed 3rdparty demos path"

This reverts commit dca2721b9de72b4435dfb80b8c7c9c2ac89ed370.
---
 3rdparty/boing/main.c | 111 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 3rdparty/boing/main.c

(limited to '3rdparty/boing/main.c')

diff --git a/3rdparty/boing/main.c b/3rdparty/boing/main.c
new file mode 100644
index 00000000..a34cd2a9
--- /dev/null
+++ b/3rdparty/boing/main.c
@@ -0,0 +1,111 @@
+/* Derived from the 2011 IOCCC submission by peter.eastman@gmail.com
+ * http://www.ioccc.org/2011/eastman/eastman.c
+ * --
+ * Public Domain -- but you're looking at this for ideas of techniques
+ * and methods, not trying to cut&paste an entire application, anyway.
+ * --
+ * When you need to blit an entire screenfull of data to an LCD
+ * display, the basic idea is to exploit the auto-increment feature of
+ * the display controller when it writes to screen memory. You start
+ * by resetting the 'cursor' to the 0,0 position, and then stream
+ * width*height pixels out.
+ * --
+ * Chris Baird,, <cjb@brushtail.apana.org.au> April 2013
+ */
+
+#include <math.h>
+#include "ch.h"
+#include "hal.h"
+#include "gfx.h"
+#include "ssd2119.h"
+
+#define Lightgrey (HTML2COLOR(0xC0C0C0))
+#define Midgrey (HTML2COLOR(0x606060))
+#define Darkgrey (HTML2COLOR(0x303030))
+
+
+/* ---------------------------------------------------------------------- */
+/* As of early April 2013, the /gfx extension tries to keep the low-level
+ * stuff away from our filthy paws. So Code Duplication.
+ * (Possibly to be replaced with gdispStartStream(), gdispWriteStream()
+ * and gdispStopStream() in the future.)
+ */
+
+#define GDISP_REG (*((volatile uint16_t *) 0x60000000)) /* DC = 0 */
+#define GDISP_RAM (*((volatile uint16_t *) 0x60100000)) /* DC = 1 */
+
+inline void write_index (uint16_t index) { GDISP_REG = index; }
+inline void write_data (uint16_t data) { GDISP_RAM = data; }
+
+#define write_reg(reg, data) { write_index(reg); write_data(data); }
+
+void reset_cursor (void)
+{
+  write_reg (SSD2119_REG_X_RAM_ADDR, 0);
+  write_reg (SSD2119_REG_Y_RAM_ADDR, 0);
+}
+
+#define StartStream() { write_index (SSD2119_REG_RAM_DATA); }
+#define WriteStream(x) { write_data (x); }
+#define StopStream() /* NOP */
+
+
+/* ---------------------------------------------------------------------- */
+
+void main (void)
+{
+  uint16_t xx, yy, colour;
+
+  halInit();
+  chSysInit();
+  gdispInit();
+
+  uint16_t width = (uint16_t)gdispGetWidth();
+  uint16_t height = (uint16_t)gdispGetHeight();
+
+  float i=height/5+height%2+1, floorstart=height/5-1, spherespin=0.0,
+    l=width/2, m=height/4, n=.01*width, o=0.0, rotspeed=0.1, h, f, g;
+
+  while (TRUE)
+    {
+      reset_cursor ();
+      StartStream ();
+
+      for (xx=yy=0;
+	   h = (m-yy)/i, f=-.3*(g=(l-xx)/i)+.954*h, yy<height;
+	   yy += (xx = ++xx%width)==0 )
+	{
+	  if (g*g < 1-h*h)	/* if inside the ball */
+	    if (((int)(9-spherespin+(.954*g+.3*h)/sqrtf(1-f*f))+(int)(2+f*2))%2==0)
+	      colour = Red;
+	    else
+	      colour = White;
+	  else
+	    {
+	      if (xx<floorstart || xx>width-floorstart)
+		colour = Darkgrey; /* side wall */
+	      else
+		colour = Lightgrey; /* back wall */
+
+	      if (yy > height-floorstart)
+		if (xx < height-yy || height-yy > width-xx) /* floor */
+		  colour = Darkgrey;
+		else
+		  colour = Midgrey;
+
+	      if (g*(g+.6)+.09+h*h < 1)
+		colour >>= 1;	/* ball shadow; make it darker  */
+	    }
+
+	  WriteStream (colour);	/* pixel to the LCD */
+	}
+
+      StopStream();
+      spherespin += rotspeed;
+      m += o;
+      o = m > height-1.75*floorstart ? -.04*height : o+.002*height;
+      n = (l+=n)<i || l>width-i ? rotspeed=-rotspeed,-n : n;
+    }
+}
+
+/* ---------------------------------------------------------------------- */
-- 
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