163 lines
4.5 KiB
C
163 lines
4.5 KiB
C
/*
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* Copyright (c) 2002-2004, Adam Dunkels.
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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
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* are met:
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* 1. 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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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* 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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* This file is part of the Contiki desktop environment
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*
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* $Id: ssfire.c,v 1.1 2007/05/23 23:11:24 oliverschmidt Exp $
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*
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*/
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#include <stdlib.h>
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#include "ctk/ctk.h"
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#include "ctk/ctk-draw.h"
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#include "ctk/ctk-mouse.h"
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#include "contiki.h"
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#include "sys/loader.h"
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PROCESS(ssfire_process, "Fire screensaver");
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static unsigned char flames[8*17];
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static const unsigned char flamecolors[16] =
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{COLOR_BLACK, COLOR_BLACK, COLOR_BLACK, COLOR_RED,
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COLOR_LIGHTRED, COLOR_YELLOW, COLOR_WHITE, COLOR_WHITE,
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COLOR_WHITE, COLOR_WHITE, COLOR_WHITE, COLOR_WHITE,
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COLOR_WHITE, COLOR_WHITE, COLOR_WHITE, COLOR_WHITE};
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/*---------------------------------------------------------------------------*/
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static void
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fire_init(void)
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{
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unsigned char *ptr, *cptr;
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/* Fill screen with inverted spaces. */
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cptr = COLOR_RAM;
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for(ptr = (unsigned char *)0x0400;
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ptr != (unsigned char *)0x07e8;
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++ptr) {
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*ptr = 0xa0;
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*cptr++ = 0x00;
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}
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SID.v3.freq = 0xffff;
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SID.v3.ctrl = 0x80;
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SID.amp = 0;
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VIC.ctrl1 = 0x1b; /* $D011 */
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VIC.addr = 0x17; /* $D018 */
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VIC.ctrl2 = 0xc8; /* $D016 */
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VIC.bordercolor = 0x00; /* $D020 */
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VIC.bgcolor0 = 0x00; /* $D021 */
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CIA2.pra = 0x03; /* $DD00 */
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}
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/*---------------------------------------------------------------------------*/
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#pragma optimize(push, off)
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static void
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fire_burn(void)
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{
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/* Calculate new flames. */
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asm("ldy #$00");
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loop1:
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asm("lda %v+7,y", flames);
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asm("clc");
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asm("adc %v+8,y", flames);
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asm("adc %v+9,y", flames);
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asm("adc %v+16,y", flames);
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asm("lsr");
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asm("lsr");
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asm("sta %v,y", flames);
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asm("iny");
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asm("cpy #(8*15)");
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asm("bne %g", loop1);
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/* Fill last line with pseudo-random data from noise generator on
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voice 3. */
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asm("ldy #$05");
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loop2:
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asm("ldx #$20");
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delay:
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asm("dex");
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asm("bne %g", delay);
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asm("lda $D41B");
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asm("and #$0F");
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asm("sta %v+8*15+1,y", flames);
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asm("dey");
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asm("bpl %g", loop2);
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}
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#pragma optimize(pop)
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/*---------------------------------------------------------------------------*/
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static unsigned char *flameptr, *colorptr1, *colorptr2;
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static unsigned char x, y;
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static void
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pollhandler(void)
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{
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if(ctk_mode_get() == CTK_MODE_SCREENSAVER) {
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fire_burn();
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/* Display flames on screen. */
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flameptr = flames;
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colorptr1 = COLOR_RAM + 40*10;
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colorptr2 = colorptr1 + 0x20;
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for(y = 0; y < 15; ++y) {
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for(x = 0; x < 8; ++x) {
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colorptr1[x] = colorptr2[x] = flamecolors[flameptr[x]];
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}
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colorptr1 += 0x28;
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colorptr2 += 0x28;
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flameptr += 8;
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}
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}
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}
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(ssfire_process, ev, data)
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{
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PROCESS_POLLHANDLER(pollhandler());
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PROCESS_BEGIN();
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ctk_mode_set(CTK_MODE_SCREENSAVER);
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ctk_mouse_hide();
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fire_init();
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PROCESS_WAIT_EVENT_UNTIL(ev == ctk_signal_screensaver_stop ||
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ev == PROCESS_EVENT_EXIT);
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ctk_draw_init();
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ctk_desktop_redraw(NULL);
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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