mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-07-05 00:28:59 +00:00
673 lines
15 KiB
C
673 lines
15 KiB
C
/* A Linux/SDL/C version of Hellmood's amazing 256B DOS Memories Demo */
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/* See http://www.sizecoding.org/wiki/Memories for a rundown on how it works */
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/* This is a conversion to C I did in an attempt to see how it works */
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/* and also to see if I could port any of this to the Apple II */
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/* x86 has amazing code density with powerful instructions */
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/* stos, mul, div, FPU, lots of 1-byte instructions */
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/* and old x86 hardware made it really easy to program with limited code */
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/* VGA/MCGA Mode13h (320x200 256 colors linear framebuffer) */
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/* soundblaster MIDI with only a few out instructions */
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/* Anyway this is a rough attempt to getting things going in C */
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/* The last effect (ocean) is doing lots of sketchy stuff and */
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/* depending a bit on undefined behavior so it's hit or miss */
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/* whether it will work for you */
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/* deater -- Vince Weaver -- vince@deater.net -- 23 April 2020 */
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#include <stdio.h>
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#include <unistd.h>
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#include <SDL.h>
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static unsigned short frame;
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static unsigned short stack[128];
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static unsigned short ax,bx,cx,dx,es;
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static int cf=0,of=0,zf=0,sf=0;
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static int sp=0;
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static unsigned char framebuffer[320*200];
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static SDL_Surface *sdl_screen=NULL;
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struct palette {
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unsigned char red[256];
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unsigned char green[256];
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unsigned char blue[256];
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};
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static struct palette pal;
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static int mode13h_graphics_init(void) {
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int mode;
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mode=SDL_SWSURFACE|SDL_HWPALETTE|SDL_HWSURFACE;
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if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
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fprintf(stderr,
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"Couldn't initialize SDL: %s\n", SDL_GetError());
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return -1;
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}
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/* Clean up on exit */
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atexit(SDL_Quit);
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/* assume 32-bit color */
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sdl_screen = SDL_SetVideoMode(320, 200, 32, mode);
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if ( sdl_screen == NULL ) {
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fprintf(stderr, "ERROR! Couldn't set 320x200 video mode: %s\n",
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SDL_GetError());
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return -1;
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}
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SDL_EnableKeyRepeat(SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL);
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SDL_WM_SetCaption("memories -- Linux/C/SDL","memories");
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return 0;
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}
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static int mode13h_graphics_update(unsigned char *buffer, struct palette *pal) {
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unsigned int *t_pointer;
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int x,temp;
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/* point to SDL output pixels */
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t_pointer=((Uint32 *)sdl_screen->pixels);
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for(x=0;x<320*200;x++) {
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temp=(pal->red[buffer[x]]<<16)|
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(pal->green[buffer[x]]<<8)|
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(pal->blue[buffer[x]]<<0)|0;
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t_pointer[x]=temp;
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}
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SDL_UpdateRect(sdl_screen, 0, 0, 320, 200);
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return 0;
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}
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static void set_vga_pal(void) {
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/* output of vgapal https://github.com/canidlogic/vgapal */
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unsigned char raw_pal[3*256]=
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{ 0, 0, 0, 0, 0, 170, 0, 170, 0, 0, 170, 170,
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170, 0, 0, 170, 0, 170, 170, 85, 0, 170, 170, 170,
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85, 85, 85, 85, 85, 255, 85, 255, 85, 85, 255, 255,
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255, 85, 85, 255, 85, 255, 255, 255, 85, 255, 255, 255,
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0, 0, 0, 20, 20, 20, 32, 32, 32, 44, 44, 44,
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56, 56, 56, 69, 69, 69, 81, 81, 81, 97, 97, 97,
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113, 113, 113, 130, 130, 130, 146, 146, 146, 162, 162, 162,
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182, 182, 182, 203, 203, 203, 227, 227, 227, 255, 255, 255,
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0, 0, 255, 65, 0, 255, 125, 0, 255, 190, 0, 255,
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255, 0, 255, 255, 0, 190, 255, 0, 125, 255, 0, 65,
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255, 0, 0, 255, 65, 0, 255, 125, 0, 255, 190, 0,
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255, 255, 0, 190, 255, 0, 125, 255, 0, 65, 255, 0,
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0, 255, 0, 0, 255, 65, 0, 255, 125, 0, 255, 190,
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0, 255, 255, 0, 190, 255, 0, 125, 255, 0, 65, 255,
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125, 125, 255, 158, 125, 255, 190, 125, 255, 223, 125, 255,
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255, 125, 255, 255, 125, 223, 255, 125, 190, 255, 125, 158,
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255, 125, 125, 255, 158, 125, 255, 190, 125, 255, 223, 125,
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255, 255, 125, 223, 255, 125, 190, 255, 125, 158, 255, 125,
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125, 255, 125, 125, 255, 158, 125, 255, 190, 125, 255, 223,
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125, 255, 255, 125, 223, 255, 125, 190, 255, 125, 158, 255,
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182, 182, 255, 199, 182, 255, 219, 182, 255, 235, 182, 255,
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255, 182, 255, 255, 182, 235, 255, 182, 219, 255, 182, 199,
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255, 182, 182, 255, 199, 182, 255, 219, 182, 255, 235, 182,
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255, 255, 182, 235, 255, 182, 219, 255, 182, 199, 255, 182,
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182, 255, 182, 182, 255, 199, 182, 255, 219, 182, 255, 235,
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182, 255, 255, 182, 235, 255, 182, 219, 255, 182, 199, 255,
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0, 0, 113, 28, 0, 113, 56, 0, 113, 85, 0, 113,
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113, 0, 113, 113, 0, 85, 113, 0, 56, 113, 0, 28,
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113, 0, 0, 113, 28, 0, 113, 56, 0, 113, 85, 0,
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113, 113, 0, 85, 113, 0, 56, 113, 0, 28, 113, 0,
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0, 113, 0, 0, 113, 28, 0, 113, 56, 0, 113, 85,
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0, 113, 113, 0, 85, 113, 0, 56, 113, 0, 28, 113,
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56, 56, 113, 69, 56, 113, 85, 56, 113, 97, 56, 113,
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113, 56, 113, 113, 56, 97, 113, 56, 85, 113, 56, 69,
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113, 56, 56, 113, 69, 56, 113, 85, 56, 113, 97, 56,
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113, 113, 56, 97, 113, 56, 85, 113, 56, 69, 113, 56,
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56, 113, 56, 56, 113, 69, 56, 113, 85, 56, 113, 97,
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56, 113, 113, 56, 97, 113, 56, 85, 113, 56, 69, 113,
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81, 81, 113, 89, 81, 113, 97, 81, 113, 105, 81, 113,
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113, 81, 113, 113, 81, 105, 113, 81, 97, 113, 81, 89,
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113, 81, 81, 113, 89, 81, 113, 97, 81, 113, 105, 81,
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113, 113, 81, 105, 113, 81, 97, 113, 81, 89, 113, 81,
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81, 113, 81, 81, 113, 89, 81, 113, 97, 81, 113, 105,
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81, 113, 113, 81, 105, 113, 81, 97, 113, 81, 89, 113,
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0, 0, 65, 16, 0, 65, 32, 0, 65, 48, 0, 65,
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65, 0, 65, 65, 0, 48, 65, 0, 32, 65, 0, 16,
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65, 0, 0, 65, 16, 0, 65, 32, 0, 65, 48, 0,
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65, 65, 0, 48, 65, 0, 32, 65, 0, 16, 65, 0,
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0, 65, 0, 0, 65, 16, 0, 65, 32, 0, 65, 48,
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0, 65, 65, 0, 48, 65, 0, 32, 65, 0, 16, 65,
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32, 32, 65, 40, 32, 65, 48, 32, 65, 56, 32, 65,
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65, 32, 65, 65, 32, 56, 65, 32, 48, 65, 32, 40,
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65, 32, 32, 65, 40, 32, 65, 48, 32, 65, 56, 32,
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65, 65, 32, 56, 65, 32, 48, 65, 32, 40, 65, 32,
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32, 65, 32, 32, 65, 40, 32, 65, 48, 32, 65, 56,
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32, 65, 65, 32, 56, 65, 32, 48, 65, 32, 40, 65,
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44, 44, 65, 48, 44, 65, 52, 44, 65, 60, 44, 65,
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65, 44, 65, 65, 44, 60, 65, 44, 52, 65, 44, 48,
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65, 44, 44, 65, 48, 44, 65, 52, 44, 65, 60, 44,
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65, 65, 44, 60, 65, 44, 52, 65, 44, 48, 65, 44,
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44, 65, 44, 44, 65, 48, 44, 65, 52, 44, 65, 60,
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44, 65, 65, 44, 60, 65, 44, 52, 65, 44, 48, 65,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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int i;
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for(i=0;i<256;i++) {
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pal.red[i]=raw_pal[i*3];
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pal.green[i]=raw_pal[(i*3)+1];
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pal.blue[i]=raw_pal[(i*3)+2];
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}
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return;
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}
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static int graphics_input(void) {
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SDL_Event event;
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int keypressed;
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while ( SDL_PollEvent(&event)) {
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switch(event.type) {
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case SDL_KEYDOWN:
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keypressed=event.key.keysym.sym;
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switch (keypressed) {
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case SDLK_ESCAPE:
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return 27;
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}
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break;
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}
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}
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return 0;
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}
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static void write_framebuffer(int address, int value) {
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int real_addr;
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real_addr=address-0xa0000;
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if ((real_addr<0) || (real_addr>320*200)) return;
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framebuffer[real_addr]=value;
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}
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#if 0
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/* unsigned multiply */
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static void mul_16(unsigned short value) {
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unsigned int result;
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result=ax*value;
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// printf("%x*%x=%x ",value,ax,result);
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ax=result&0xffff;
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dx=result>>16;
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// printf("%x:%x x=%d y=%d\n",dx,ax,
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// dx&0xff,(dx>>8)&0xff);
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if (dx==0) {
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of=0;
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cf=0;
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}
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else {
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of=1;
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cf=1;
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}
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}
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#endif
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/*
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static void imul(short value) {
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int result;
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result=ax*value;
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ax=result&0xffff;
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dx=result>>16;
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}
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*/
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/* signed multiply */
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static void imul_8(char value) {
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short result;
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char src;
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src=ax;
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result=src*value;
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// printf("imul: %d*%d=%d ",src,value,result);
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ax=result;
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if (ax==(ax&0xff)) {
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cf=0;
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of=0;
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}
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else {
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cf=1;
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of=1;
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}
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}
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/* signed multiply */
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static void imul_16(short value) {
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int result;
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short src;
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src=ax;
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result=src*value;
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// printf("imul: %d*%d=%d ",src,value,result);
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ax=(result&0xffff);
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dx=((result>>16)&0xffff);
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if (dx==0) {
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cf=0;
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of=0;
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}
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else {
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cf=1;
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of=1;
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}
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}
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static void push(int value) {
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//printf("Pushing %x\n",value);
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stack[sp]=value;
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sp++;
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}
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static short pop(void) {
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if (sp==0) {
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printf("Stack underflow!\n");
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return 0;
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}
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sp--;
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//printf("Popping %x\n",stack[sp]);
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return stack[sp];
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}
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/* tilted plane */
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/* DH=Y, DL=X */
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static int fx0(int xx, int yy, int xprime) {
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unsigned short scaled;
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int color;
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yy=yy+0x29; // add dh,al ; prevent divide overflow
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scaled=((0x1329/yy)&0xff); // div dh ; reverse divide AL=C/Y'
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color=((signed char)(xprime&0xff))*((signed char)(scaled&0xff));
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scaled-=frame;
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color=(color>>8)&0xff;
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color^=(scaled&0xff);
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color&=0x1c; // map colors
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return color;
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}
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/* circles? */
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/* DH=Y, DL=X */
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static int fx1(int xx, int yy, int xprime) {
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signed short yyy,xxx;
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signed short color;
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yyy=yy-100; /* align Y vertically */
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yyy=yyy*yyy;
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color=((yyy/256)&0xff);
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/* signed 8-bit multiply */
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xxx=(char)xprime*(char)xprime;
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color+=((xxx/256)&0xff);
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color+=frame; /* offset color by time */
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color&=0x18; /* select special rings */
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return color;
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}
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/* checkers */
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static int fx2(int xx, int yy, int xprime) {
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int color;
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color=((yy&0xff)<<8) | (xprime&0xff);
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color=color-frame; /* adjust with frame */
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color=((color>>8)&0xff)^(color&0xff); /* xor x and y */
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color|=0xdb; /* or result with 0xdb */
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color+=0x13; /* Map to yellow/grey */
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return color;
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}
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/* parallax checkerboard */
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static int fx3(int xx,int yy,int xprime) {
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unsigned short color;
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cx=frame; // mov cx,bp ; set init point to time
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bx=-16; // mov bx,-16 ; limit to 16 iterations
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fx3L:
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cx=cx+(yy*320)+xx; // add cx, di ; offset by screenpointer
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// ax=0x333; // mov ax,819 ; magic, related to Rrrola
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ax=0xcccd/64;
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imul_16(cx); // imul cx ; get X',Y' in DX
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bx++; // inc bx ; increment iteration count
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// check bottom bit of top word of multiply
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// ja fx3L ; loop until "hit" or "iter=max"
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// jump above, if cf==0 and zf==0
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if ((bx!=0) && ((dx&1)==0)) goto fx3L;
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color=bx+31; // lea ax,[bx+32] ; map value to standard gray scale
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//printf("%d %d\n",ax,bx);
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return color;
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}
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/* sierpinski rotozoomer */
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static int fx4(int xx, int yy, int xprime) {
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unsigned char dh,bh;
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unsigned short color,t,xsext;
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int temp;
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t=frame-2048; // lea cx,[bp-2048] ; center time to pass zero
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t=t<<3; // sal cx,3 ; speed up by factor of 8!
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/* sign extend X */
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xsext=xprime; // get X into DL
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if (xsext&0x80) xsext|=0xff00;
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else xsext&=0x00ff;
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temp=yy*t; // temp=Y*T
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bh=(temp>>8)+xsext; // bh=((y*t)/256)+X
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temp=xsext*t; // temp=X*T
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dh=(temp>>8)&0xff; // dh=(X*T/256)
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color=(yy-dh)&bh; // color=(Y-(X*T/256))&(Y*T/256+X)
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// and al,252 ; thicker sierpinksi
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if ((color&252)==0) {
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color=0x2a; // otherwise: a nice orange
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}
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else {
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color=0; // leave black if not sierpinksi
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}
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return color;
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}
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/* raycast bent tunnel */
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static int fx5(int xx, int yy, int xprime) {
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unsigned char al,cl;
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unsigned short temp;
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dx=((yy&0xff)<<8) | (xprime&0xff);
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cx=cx&0xff00;
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cx|=(-9&0xff); // mov cl,-9 ; start with depth 9 (moves backwards)
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fx5L:
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cl=cx&0xff;
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push(dx); // push dx ; save DX, destroyed inside loop
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al=(dx>>8)&0xff;// mov al,dh ; get Y into AL
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al-=100; // sub al,100 ; centering Y manually
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ax=ax&0xff00;
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ax|=(al&0xff);
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imul_8(cl); // imul cl ; multiply AL=Y by current distance to get projection
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// xchg ax,dx ; gt X into AL while saving DX
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temp=ax;
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ax=dx;
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dx=temp;
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al=ax&0xff;
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al+=cl; // add al,cl ; add distance to projection (bend right)
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ax=ax&0xff00;
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ax|=(al&0xff);
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imul_8(cl); // imul cl ; multiply AL=X by the current projection
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al=(dx>>8)&0xff;// mov al,dh ; get projection(1) in AL
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al^=(ax>>8); // xor al,ah ; combine with projection(2)
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al+=4; // add al,4 ; center the walls around 0
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if (al&-8) { // test al,-8 ; test if the wall is hit
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zf=0;
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}
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else {
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zf=1;
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}
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dx=pop(); // pop dx (restore dx)
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cx&=0xff00;
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cx|=(cl&0xff);
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cx--;
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if ((cx!=0) && (zf==1)) goto fx5L;
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// loopz fx5L (repeat until "hit" or "iter=max"
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cx=cx-frame; // sub cx,bp ; offset depth by time
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al^=(cx&0xff); // xor al,cl ; XOR pattern for texture
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// ah=al/6;
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al=al%6; // aam 6 ; irregular pattern with MOD 6
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al+=20; // add al,20 ; offset into grayscale pattern
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ax=al&0xff;
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return ax;
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}
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/* ocean night */
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static int fx6(int xx, int yy, int xprime) {
|
|
char dh;
|
|
double f;
|
|
int edx;
|
|
char scratch[64];
|
|
|
|
dx=((yy&0xff)<<8) | (xprime&0xff);
|
|
|
|
// bx coming in is the address of the effect
|
|
// this is a guess, too lazy to hexdump
|
|
bx=0x1d5;
|
|
|
|
// si=?? based on sound playing?
|
|
// ax (sky color) is ?
|
|
|
|
dh=dx>>8;
|
|
// sub dh,120 ; check if pixel in the sky
|
|
dh=dh-120;
|
|
sf=!!(dh&0x80);
|
|
// js fx6q ; quit if that's the case
|
|
if (sf) goto fx6q;
|
|
|
|
dx&=0xff;
|
|
dx|=dh<<8;
|
|
|
|
// mov [bx+si],dx ; move xy to memory location
|
|
// fild word [bx+si] ; read as integer
|
|
// fidivr dword [bx+si] ; reverse divide by constant
|
|
// Divide m32int by ST(0) and store result in ST(0)
|
|
// fstp dword [bx+si-1] ; store result as floating point
|
|
// mov ax,[bx+si] ; get result into ax
|
|
|
|
memcpy(&scratch[32],&dx,sizeof(short));
|
|
f=dx;
|
|
memcpy(&edx,&scratch[32],sizeof(int));
|
|
f=f/edx;
|
|
memcpy(&scratch[31],&f,sizeof(double));
|
|
memcpy(&ax,&scratch[32],sizeof(short));
|
|
|
|
|
|
|
|
|
|
ax+=frame; // add ax,bp ; modify color by time
|
|
ax&=0xff80; // and al,128 ; threshold into two bands
|
|
ax--; // dec ax ; beautify colors to blue/black
|
|
fx6q: ;
|
|
return ax;
|
|
}
|
|
|
|
|
|
|
|
|
|
/* raycast bent tunnel */
|
|
/* no multiply */
|
|
static int fx7(int xx, int yy, int xprime) {
|
|
|
|
#if 0
|
|
unsigned char al,ah,bl,bh,cl,dl,dh,tb=0;
|
|
unsigned short bp;
|
|
|
|
// dx=((yy&0xff)<<8) | (xprime&0xff);
|
|
|
|
// dx=y
|
|
// bp=x
|
|
|
|
dh=0;
|
|
dl=yy; // xor dx,dx
|
|
bp=xprime;
|
|
|
|
cl=80; // mov cl,80
|
|
ch=0; // mov ch,0
|
|
ah=0; // xor ax,ax
|
|
al=0;
|
|
bh=0; // xor bx,bx
|
|
bx=0;
|
|
|
|
L:
|
|
ch=ch-dh; // sub ch,dh ah/ch = x
|
|
ah=ah-0-cf; // sbb ah,0
|
|
ch=ch+cl; // add ch,cl bend with depth
|
|
ah=ah+0+cf; // adc ah,0
|
|
|
|
bl=bl-dl; // sub bl,dl bh/bl=y
|
|
bh=bh-0-cf; // sbb bh,0
|
|
bl=bl+cl; // add bl,cl bend with depth
|
|
bh=bh+0+cf; // adc bh,0
|
|
bl=bl+cl; // add bl,cl bend with depth
|
|
bh=bh+0+cf; // adc bh,0
|
|
|
|
al=bh; // mov al,bh leave ah,bh untouched
|
|
al=al^ah; // xor al,ah geometry check
|
|
al+=4; // add al,4 geometry check
|
|
// test al,8 geometry check
|
|
// jnz Q
|
|
if (al&8!=0) goto Q;
|
|
|
|
cl--; // dec cl
|
|
if (cl!=0) goto L;
|
|
|
|
if ((cl!=0) && (zf==1)) goto L; // loopz L
|
|
|
|
Q:
|
|
cl=cl-frame; // probably the timer sub cl,[0x46c]
|
|
al=al^cl; // xor al,cl
|
|
// aam 6
|
|
al=al+20; // add al,20
|
|
// stosb
|
|
#endif
|
|
|
|
return ax;
|
|
}
|
|
|
|
int main(int argc, char **argv) {
|
|
|
|
int color=0,which,xx,yy,xprime;
|
|
|
|
set_vga_pal();
|
|
|
|
mode13h_graphics_init();
|
|
|
|
// frame=0x13;
|
|
es=0xa000-10;
|
|
|
|
frame=3*512;
|
|
|
|
while(1) {
|
|
for(yy=0;yy<200;yy++) {
|
|
for(xx=0;xx<320;xx++) {
|
|
|
|
xprime=xx*256/320;
|
|
/* rrolla multiply by 0xcccd trick */
|
|
|
|
which=frame/512;
|
|
switch (which&0x7) {
|
|
case 0: color=fx2(xx,yy,xprime); break;
|
|
case 1: color=fx1(xx,yy,xprime); break;
|
|
case 2: color=fx0(xx,yy,xprime); break;
|
|
case 3: color=fx3(xx,yy,xprime); break;
|
|
case 4: color=fx4(xx,yy,xprime); break;
|
|
case 5: color=fx5(xx,yy,xprime); break;
|
|
case 6: color=fx6(xx,yy,xprime); break;
|
|
case 7: color=fx7(xx,yy,xprime); break;
|
|
default: printf("Trying effect %d\n",which);
|
|
}
|
|
write_framebuffer((es<<4)+((yy*320)+xx), color);
|
|
|
|
/* 320*200=64000; / 3 = 21,333R1 */
|
|
/* 65536 / 3 = 21845 R 1 */
|
|
/* so wraps 3 times before updating screen? */
|
|
}
|
|
}
|
|
|
|
mode13h_graphics_update(framebuffer,&pal);
|
|
|
|
usleep(10000);
|
|
frame++;
|
|
|
|
if (graphics_input()) {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|