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contiki/platform/c64/apps/plasma.c

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/*
* Copyright (c) 2002-2004, Adam Dunkels.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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.
*
* This file is part of the Contiki desktop environment
*
* $Id: plasma.c,v 1.1 2006/06/17 22:41:25 adamdunkels Exp $
*
*/
#include <stdlib.h>
#include "ctk/ctk.h"
#include "ctk/ctk-draw.h"
#include "ctk/ctk-mouse.h"
#include "contiki.h"
static unsigned char sinetab1[256] = {
128, 131, 134, 137, 140, 143, 146, 149,
152, 156, 159, 162, 165, 168, 171, 174,
176, 179, 182, 185, 188, 191, 193, 196,
199, 201, 204, 206, 209, 211, 213, 216,
218, 220, 222, 224, 226, 228, 230, 232,
234, 236, 237, 239, 240, 242, 243, 245,
246, 247, 248, 249, 250, 251, 252, 252,
253, 254, 254, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 254, 254,
253, 252, 252, 251, 250, 249, 248, 247,
246, 245, 243, 242, 240, 239, 237, 236,
234, 232, 230, 228, 226, 224, 222, 220,
218, 216, 213, 211, 209, 206, 204, 201,
199, 196, 193, 191, 188, 185, 182, 179,
176, 174, 171, 168, 165, 162, 159, 156,
152, 149, 146, 143, 140, 137, 134, 131,
128, 124, 121, 118, 115, 112, 109, 106,
103, 99, 96, 93, 90, 87, 84, 81,
79, 76, 73, 70, 67, 64, 62, 59,
56, 54, 51, 49, 46, 44, 42, 39,
37, 35, 33, 31, 29, 27, 25, 23,
21, 19, 18, 16, 15, 13, 12, 10,
9, 8, 7, 6, 5, 4, 3, 3,
2, 1, 1, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 1, 1,
2, 3, 3, 4, 5, 6, 7, 8,
9, 10, 12, 13, 15, 16, 18, 19,
21, 23, 25, 27, 29, 31, 33, 35,
37, 39, 42, 44, 46, 49, 51, 54,
56, 59, 62, 64, 67, 70, 73, 76,
78, 81, 84, 87, 90, 93, 96, 99,
103, 106, 109, 112, 115, 118, 121, 124,
};
static unsigned char sinetab2[256];
static unsigned char sinetab3[256];
static unsigned char colortab[256];
static unsigned char colors[16] =
{
0x00, 0x06, 0x0b, 0x04,
0x0a, 0x0f, 0x07, 0x01,
0x07, 0x0f, 0x0a, 0x08,
0x02, 0x09, 0x00, 0x00,
};
#define XSIZE 25
#define YSIZE 25
#define XADD01 0xfe
#define YADD01 0x05
#define XADD1 0x04
#define YADD1 0x02
#define XADD2 0xfc
#define YADD2 0xf9
#define XADD 0x03
#define YADD 0xfe
#define MOVADD 0xfb
static unsigned char xplasma[XSIZE], yplasma[YSIZE];
static unsigned char xcnt, ycnt;
static unsigned char xcnt01, xcnt02, xcnt1, xcnt2;
static unsigned char ycnt01, ycnt02, ycnt1, ycnt2;
static unsigned char xadd02 = 0x01;
static unsigned char yadd02 = 0xfb;
static unsigned char movcnt;
PROCESS(plasma_process, "Plasma screensaver");
/*---------------------------------------------------------------------------*/
static void
scrninit(void)
{
unsigned char *ptr, *cptr;
static int i;
/* Make sine tables */
for(i = 0; i < 256; ++i) {
sinetab2[(unsigned char)i] = sinetab1[(unsigned char)i] / 2;
sinetab3[(unsigned char)i] = sinetab1[(unsigned char)i] / 4;
}
/* Make color table */
for(i = 0; i < 256; ++i) {
colortab[(unsigned char)i] = colors[(unsigned char)i / 16];
}
/* Fill screen with inverted spaces. */
cptr = COLOR_RAM;
for(ptr = (unsigned char *)0x0400;
ptr != (unsigned char *)0x07e8;
++ptr) {
*ptr = 0xa0;
*cptr++ = 0x00;
}
VIC.ctrl1 = 0x1b; /* $D011 */
VIC.addr = 0x17; /* $D018 */
VIC.ctrl2 = 0xc8; /* $D016 */
VIC.bordercolor = 0x00; /* $D020 */
VIC.bgcolor0 = 0x00; /* $D021 */
CIA2.pra = 0x03; /* $DD00 */
}
/*---------------------------------------------------------------------------*/
static void
pollhandler(void)
{
static unsigned char i, x, y;
register unsigned char *cptr;
if(ctk_mode_get() == CTK_MODE_SCREENSAVER) {
xcnt1 = xcnt01;
xcnt2 = xcnt02;
for(i = 0; i < XSIZE; ++i) {
xplasma[i] = sinetab1[xcnt1] + sinetab2[xcnt2];
xcnt1 += XADD1;
xcnt2 += XADD2;
}
ycnt1 = ycnt01;
ycnt2 = ycnt02;
for(i = 0; i < YSIZE; ++i) {
yplasma[i] = sinetab1[ycnt1] + sinetab3[ycnt2];
ycnt1 += YADD1;
ycnt2 += YADD2;
}
xcnt01 += XADD01;
xcnt02 += xadd02;
ycnt01 += YADD01;
ycnt02 += yadd02;
yadd02 = sinetab3[ycnt] / 4;
xadd02 = sinetab3[xcnt] / 4;
ycnt += YADD;
xcnt += XADD;
movcnt += MOVADD;
cptr = (unsigned char *)(COLOR_RAM + sinetab1[movcnt]/16);
for(y = 0; y < YSIZE; ++y) {
for(x = 0; x < XSIZE; ++x) {
*cptr = colortab[(xplasma[x] + yplasma[y]) & 0xff];
++cptr;
}
cptr += 40 - XSIZE;
}
}
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(plasma_process, ev, data)
{
PROCESS_POLLHANDLER(pollhandler());
PROCESS_BEGIN();
ctk_mode_set(CTK_MODE_SCREENSAVER);
ctk_mouse_hide();
scrninit();
PROCESS_WAIT_EVENT_UNTIL(ev == ctk_signal_screensaver_stop ||
ev == PROCESS_EVENT_EXIT);
ctk_draw_init();
ctk_desktop_redraw(NULL);
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
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