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cc65/samples/plasma.c

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C
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/*****************************************************************************
* plasma test program for cc65. *
* *
* (w)2001 by groepaz/hitmen *
* *
* Cleanup and porting by Ullrich von Bassewitz. *
* *
*****************************************************************************/
#include <stdlib.h>
#include <time.h>
#include <conio.h>
#if defined(__C64__) || defined(__C128__)
# define SCREEN1 0xE000
# define SCREEN2 0xE400
# define CHARSET 0xE800
# define outb(addr,val) (*(addr)) = (val)
# define inb(addr) (*(addr))
#elif defined(__CBM510__)
# define SCREEN1 0xF000
# define SCREEN2 0xF400
# define CHARSET 0xE000
# define outb(addr,val) pokebsys ((unsigned)(addr), val)
# define inb(addr) peekbsys ((unsigned)(addr))
#elif defined(__PLUS4__)
# define SCREEN1 0x6400
# define SCREEN2 0x6C00
# define CHARSET 0x7000
# define outb(addr,val) (*(addr)) = (val)
# define inb(addr) (*(addr))
#endif
/* Values for the VIC address register to switch between the two pages */
#if defined(__PLUS4__)
#define PAGE1 ((SCREEN1 >> 8) & 0xF8)
#define PAGE2 ((SCREEN2 >> 8) & 0xF8)
#define CHARADR ((CHARSET >> 8) & 0xFC)
#else
#define PAGE1 ((SCREEN1 >> 6) & 0xF0) | ((CHARSET >> 10) & 0x0E)
#define PAGE2 ((SCREEN2 >> 6) & 0xF0) | ((CHARSET >> 10) & 0x0E)
#endif
/* Use static local variables for speed */
#pragma static-locals (1);
static const unsigned char sinustable[0x100] = {
0x80, 0x7d, 0x7a, 0x77, 0x74, 0x70, 0x6d, 0x6a,
0x67, 0x64, 0x61, 0x5e, 0x5b, 0x58, 0x55, 0x52,
0x4f, 0x4d, 0x4a, 0x47, 0x44, 0x41, 0x3f, 0x3c,
0x39, 0x37, 0x34, 0x32, 0x2f, 0x2d, 0x2b, 0x28,
0x26, 0x24, 0x22, 0x20, 0x1e, 0x1c, 0x1a, 0x18,
0x16, 0x15, 0x13, 0x11, 0x10, 0x0f, 0x0d, 0x0c,
0x0b, 0x0a, 0x08, 0x07, 0x06, 0x06, 0x05, 0x04,
0x03, 0x03, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x03,
0x03, 0x04, 0x05, 0x06, 0x06, 0x07, 0x08, 0x0a,
0x0b, 0x0c, 0x0d, 0x0f, 0x10, 0x11, 0x13, 0x15,
0x16, 0x18, 0x1a, 0x1c, 0x1e, 0x20, 0x22, 0x24,
0x26, 0x28, 0x2b, 0x2d, 0x2f, 0x32, 0x34, 0x37,
0x39, 0x3c, 0x3f, 0x41, 0x44, 0x47, 0x4a, 0x4d,
0x4f, 0x52, 0x55, 0x58, 0x5b, 0x5e, 0x61, 0x64,
0x67, 0x6a, 0x6d, 0x70, 0x74, 0x77, 0x7a, 0x7d,
0x80, 0x83, 0x86, 0x89, 0x8c, 0x90, 0x93, 0x96,
0x99, 0x9c, 0x9f, 0xa2, 0xa5, 0xa8, 0xab, 0xae,
0xb1, 0xb3, 0xb6, 0xb9, 0xbc, 0xbf, 0xc1, 0xc4,
0xc7, 0xc9, 0xcc, 0xce, 0xd1, 0xd3, 0xd5, 0xd8,
0xda, 0xdc, 0xde, 0xe0, 0xe2, 0xe4, 0xe6, 0xe8,
0xea, 0xeb, 0xed, 0xef, 0xf0, 0xf1, 0xf3, 0xf4,
0xf5, 0xf6, 0xf8, 0xf9, 0xfa, 0xfa, 0xfb, 0xfc,
0xfd, 0xfd, 0xfe, 0xfe, 0xfe, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xfe, 0xfe, 0xfe, 0xfd,
0xfd, 0xfc, 0xfb, 0xfa, 0xfa, 0xf9, 0xf8, 0xf6,
0xf5, 0xf4, 0xf3, 0xf1, 0xf0, 0xef, 0xed, 0xeb,
0xea, 0xe8, 0xe6, 0xe4, 0xe2, 0xe0, 0xde, 0xdc,
0xda, 0xd8, 0xd5, 0xd3, 0xd1, 0xce, 0xcc, 0xc9,
0xc7, 0xc4, 0xc1, 0xbf, 0xbc, 0xb9, 0xb6, 0xb3,
0xb1, 0xae, 0xab, 0xa8, 0xa5, 0xa2, 0x9f, 0x9c,
0x99, 0x96, 0x93, 0x90, 0x8c, 0x89, 0x86, 0x83
};
static void doplasma (register unsigned char* scrn)
{
unsigned char xbuf[40];
unsigned char ybuf[25];
unsigned char c1a,c1b;
unsigned char c2a,c2b;
unsigned char c1A,c1B;
unsigned char c2A,c2B;
register unsigned char i, ii;
c1a = c1A;
c1b = c1B;
for (ii = 0; ii < 25; ++ii) {
ybuf[ii] = (sinustable[c1a] + sinustable[c1b]);
c1a += 4;
c1b += 9;
}
c1A += 3;
c1B -= 5;
c2a = c2A;
c2b = c2B;
for (i = 0; i < 40; ++i) {
xbuf[i] = (sinustable[c2a] + sinustable[c2b]);
c2a += 3;
c2b += 7;
}
c2A += 2;
c2B -= 3;
for (ii = 0; ii < 25; ++ii) {
/* Unrolling the following loop will give a speed increase of
* nearly 100% (~24fps), but it will also increase the code
* size a lot.
*/
for (i = 0; i < 40; ++i, ++scrn) {
*scrn = (xbuf[i] + ybuf[ii]);
}
}
}
static void makechar (void)
{
static const unsigned char bittab[8] = {
0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80
};
unsigned char i, ii, b, s;
unsigned c;
gotoxy (0, 1);
for (c = 0; c < 0x100; ++c) {
s = sinustable[c];
for (i = 0; i < 8; ++i){
b = 0;
for (ii = 0; ii < 8; ++ii) {
if ((rand() & 0xFF) > s) {
b |= bittab[ii];
}
}
((unsigned char*)CHARSET) [(c*8) + i] = b;
}
if ((c & 0x07) == 0) {
cputc ('.');
}
}
}
int main (void)
{
unsigned char border;
unsigned char background;
unsigned char text;
unsigned char v;
clock_t t;
unsigned long f = 0;
unsigned long sec;
unsigned sec10;
unsigned long fps;
unsigned fps10;
#if defined(__C64__)
unsigned char block;
#endif
#if defined(__C128__)
unsigned char block;
unsigned char initflag;
unsigned char graphflag;
#endif
#if defined(__PLUS4__)
unsigned int i;
unsigned char v2;
#endif
clrscr ();
cprintf ("Making charset, mompls");
makechar();
/* Set the border and background colors */
border = bordercolor (COLOR_BLUE);
background = bgcolor (COLOR_BLUE);
text = textcolor (COLOR_BLACK);
clrscr ();
#if defined(__C64__) || defined(__C128__)
/* Move the VIC 16K block */
block = inb (&CIA2.pra);
outb (&CIA2.pra, (block & 0xFC) | ((SCREEN1 >> 14) ^ 0x03));
#endif
#if defined(__C128__)
/* Save and change some flags, so that kernal/basic interupt handler will
* not interfere with our routine.
*/
initflag = *(unsigned char*) 0xA04;
*(unsigned char*) 0xA04 &= 0xFE;
graphflag = *(unsigned char*) 0xD8;
*(unsigned char*) 0xD8 = 0xFF;
#endif
/* Remember the VIC address register */
#if defined(__PLUS4__)
v = inb (&TED.char_addr);
v2 = inb (&TED.video_addr);
#else
v = inb (&VIC.addr);
#endif
#if defined(__PLUS4__)
for (i=0;i<1000;i++) {
((unsigned char *) (SCREEN1-0x0400))[i] = 0;
((unsigned char *) (SCREEN2-0x0400))[i] = 0;
}
outb (&TED.char_addr, CHARADR);
#endif
/* Run the demo until a key was hit */
t = clock ();
while (!kbhit()) {
/* Build page 1, then make it visible */
doplasma ((unsigned char*)SCREEN1);
#if defined(__PLUS4__)
outb (&TED.video_addr, PAGE1);
#else
outb (&VIC.addr, PAGE1);
#endif
/* Build page 2, then make it visible */
doplasma ((unsigned char*)SCREEN2);
#if defined(__PLUS4__)
outb (&TED.video_addr, PAGE2);
#else
outb (&VIC.addr, PAGE2);
#endif
/* Count frames */
f += 2;
}
t = clock() - t;
/* Switch back the VIC screen */
#if defined(__PLUS4__)
outb (&TED.video_addr, v2);
outb (&TED.char_addr, v);
#else
outb (&VIC.addr, v);
#endif
#if defined(__C64__) || defined(__C128__)
/* Move back the VIC 16K block */
outb (&CIA2.pra, block);
#endif
#if defined(__C128__)
/* Restore the flags */
*(unsigned char*) 0xA04 = initflag;
*(unsigned char*) 0xD8 = graphflag;
#endif
/* Fetch the character from the keyboard buffer and discard it */
(void) cgetc();
/* Reset screen colors */
bordercolor (border);
bgcolor (background);
textcolor (text);
clrscr ();
/* Calculate stats */
sec = (t * 10) / CLK_TCK;
sec10 = sec % 10;
sec /= 10;
fps = (f * (CLK_TCK * 10)) / t;
fps10 = fps % 10;
fps /= 10;
/* Output stats */
gotoxy (0, 0); cprintf ("time : %lu.%us", sec, sec10);
gotoxy (0, 1); cprintf ("frames: %lu", f);
gotoxy (0, 2); cprintf ("fps : %lu.%u", fps, fps10);
/* Wait for a key, then end */
cputsxy (0, 4, "Press any key when done...");
(void) cgetc ();
/* Done */
return EXIT_SUCCESS;
}
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