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