New applications/combo demo

1 files changed, 99 insertions, 0 deletions

diff --git a/demos/applications/combo/mandelbrot.c b/demos/applications/combo/mandelbrot.c
new file mode 100644
index 00000000..68ee1fae
--- /dev/null
+++ b/demos/applications/combo/mandelbrot.c
@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2012, 2013, Joel Bodenmann aka Tectu <joel@unormal.org>
+ * Copyright (c) 2012, 2013, Andrew Hannam aka inmarket
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *    * Neither the name of the <organization> nor the
+ *      names of its contributors may be used to endorse or promote products
+ *      derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "gfx.h"
+#include "tasks.h"
+
+static volatile bool_t	run;
+static GHandle			gh;
+static gfxThreadHandle	thread;
+
+static void mandelbrot(float x1, float y1, float x2, float y2) {
+	unsigned int i,j, width, height;
+	uint16_t iter;
+	float fwidth, fheight;
+	
+	float sy = y2 - y1;
+	float sx = x2 - x1;
+	const int MAX = 512;
+	
+	width = (unsigned int)gwinGetWidth(gh);
+	height = (unsigned int)gwinGetHeight(gh);
+	fwidth = width;
+	fheight = height;
+	
+	for(i = 0; i < width; i++) {
+		for(j = 0; j < height; j++) {
+			float cy = j * sy / fheight + y1;
+			float cx = i * sx / fwidth + x1;
+			float x=0.0f, y=0.0f, xx=0.0f, yy=0.0f;
+			gfxYield();
+			for(iter=0; iter <= MAX && xx+yy<4.0f; iter++) {
+				xx = x*x;
+				yy = y*y;
+				y = 2.0f*x*y + cy;
+				x = xx - yy + cx;
+			}
+			gwinSetColor(gh, RGB2COLOR(iter<<7, iter<<4, iter));
+			gwinDrawPixel(gh, i, j);
+		}
+	}
+}
+
+static DECLARE_THREAD_FUNCTION(task, param) {
+	float cx, cy;
+	float zoom = 1.0f;
+	(void) param;
+
+	/* where to zoom in */
+	cx = -0.086f;
+	cy = 0.85f;
+
+	while(run) {
+		mandelbrot(-2.0f*zoom+cx, -1.5f*zoom+cy, 2.0f*zoom+cx, 1.5f*zoom+cy);
+
+		zoom *= 0.7f;
+		if(zoom <= 0.00001f)
+			zoom = 1.0f;	
+	}
+	return 0;
+}
+
+void doMandlebrot(GHandle parent, bool_t start) {
+	if (start) {
+		run = TRUE;
+		gh = parent;
+		thread = gfxThreadCreate(0, 0x400, LOW_PRIORITY, task, 0);
+	} else if (run) {
+		run = FALSE;
+		gfxThreadWait(thread);
+	}
+}
+
+