a Mandelbrot set plugin from Matthias
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@4504 a1c6a512-1295-4272-9138-f99709370657
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Jörg Hohensohn
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354e31828b
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4d3aa154c6
1 changed files with 195 additions and 0 deletions
195
apps/plugins/mandelbrot.c
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195
apps/plugins/mandelbrot.c
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2004 Matthias Wientapper
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*
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* Thanks to Jens Arnold and Joerg Hohensohn for the speed tips.
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* Boy, that was a hell of a code review ;-)
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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*
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* further optimization ideas:
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* - incremental recalculation when moving
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*
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****************************************************************************/
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#include "plugin.h"
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#ifdef HAVE_LCD_BITMAP // this is not fun on the player
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static struct plugin_api* rb;
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static char buff[32];
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static int lcd_aspect_ratio;
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static int x_min;
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static int x_max;
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static int y_min;
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static int y_max;
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static int delta;
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static int max_iter;
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void init_mandelbrot_set(void){
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x_min = -5<<27; // -2.5<<28
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x_max = 1<<28; // 1.0<<28
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y_min = -1<<28; // -1.0<<28
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y_max = 1<<28; // 1.0<<28
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delta = (x_max - x_min) >> 3; // /8
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max_iter = 25;
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}
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void calc_mandelbrot_set(void){
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unsigned int start_tick;
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int n_iter;
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int x_pixel, y_pixel;
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int x, x2, y, y2, a, b;
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int x_fact, y_fact;
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start_tick = *rb->current_tick;
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rb->lcd_clear_display();
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rb->lcd_update();
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x_fact = (x_max - x_min) / LCD_WIDTH;
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y_fact = (y_max - y_min) / LCD_HEIGHT;
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for(y_pixel = LCD_HEIGHT-1; y_pixel>=0; y_pixel--){
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b = (y_pixel * y_fact) + y_min;
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for (x_pixel = LCD_WIDTH-1; x_pixel>=0; x_pixel--){
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a = (x_pixel * x_fact) + x_min;
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x = 0;
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y = 0;
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n_iter = 0;
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while (++n_iter<=max_iter) {
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x >>= 14;
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y >>= 14;
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x2 = x * x;
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y2 = y * y;
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if (x2 + y2 > (4<<28)) break;
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y = 2 * x * y + b;
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x = x2 - y2 + a;
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}
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// "coloring"
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if ( (n_iter > max_iter) ||
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(n_iter == (max_iter >> 1)) ||
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(n_iter == (max_iter >> 2)) ||
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(n_iter == (max_iter >> 3))
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){
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rb->lcd_drawpixel(x_pixel,y_pixel);
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}
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}
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/* update block of 8 lines */
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if ((y_pixel & 0x7) == 0)
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rb->lcd_update_rect(0, y_pixel, LCD_WIDTH, 8);
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}
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/* we want to know how long we had to wait */
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rb->lcd_setfont(FONT_SYSFIXED);
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rb->snprintf(buff, sizeof(buff), "%d", (*rb->current_tick - start_tick));
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rb->lcd_puts(0,0,buff);
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rb->snprintf(buff, sizeof(buff), "%d", max_iter);
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rb->lcd_puts(0,1,buff);
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rb->lcd_update_rect(0,0,24,16);
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}
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enum plugin_status plugin_start(struct plugin_api* api, void* parameter)
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{
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TEST_PLUGIN_API(api);
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(void)parameter;
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rb = api;
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init_mandelbrot_set();
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lcd_aspect_ratio = ((LCD_WIDTH<<14) / LCD_HEIGHT)<<14;
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/* main loop */
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while (true){
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calc_mandelbrot_set();
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/* FIXME: is this the right way to empty the key-queue?
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(Otherwise we have to process things twice :-/ ?! */
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rb->button_get(true);
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switch (rb->button_get(true)) {
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case BUTTON_OFF:
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return PLUGIN_OK;
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case BUTTON_ON:
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x_min -= ((delta>>14)*(lcd_aspect_ratio>>14));
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x_max += ((delta>>14)*(lcd_aspect_ratio>>14));
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y_min -= delta;
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y_max += delta;
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delta = (x_max - x_min) >> 3;
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break;
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case BUTTON_PLAY:
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x_min += ((delta>>14)*(lcd_aspect_ratio>>14));
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x_max -= ((delta>>14)*(lcd_aspect_ratio>>14));
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y_min += delta;
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y_max -= delta;
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delta = (x_max - x_min) >> 3;
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break;
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case BUTTON_UP:
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y_min -= delta;
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y_max -= delta;
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break;
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case BUTTON_DOWN:
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y_min += delta;
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y_max += delta;
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break;
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case BUTTON_LEFT:
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x_min -= delta;
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x_max -= delta;
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break;
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case BUTTON_RIGHT:
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x_min += delta;
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x_max += delta;
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break;
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case BUTTON_F1:
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if (max_iter>5){
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max_iter -= 5;
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}
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break;
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case BUTTON_F2:
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if (max_iter < 195){
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max_iter += 5;
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}
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break;
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case BUTTON_F3:
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init_mandelbrot_set();
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break;
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case SYS_USB_CONNECTED:
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rb->usb_screen();
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return PLUGIN_USB_CONNECTED;
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}
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}
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return false;
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}
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#endif
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