mirror of
https://github.com/deater/dos33fsprogs.git
synced 2025-02-09 03:31:05 +00:00
320 lines
8.8 KiB
C
320 lines
8.8 KiB
C
#include <stdio.h>
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#include <unistd.h>
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#include <SDL.h>
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#include "vga_emulator.h"
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/* technically bigger than 320x200 but some code writes off edge... */
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/* in theory 16-bit pointer can't write beyond this */
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unsigned char framebuffer[65536];
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static SDL_Surface *sdl_screen=NULL;
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static struct palette pal;
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static int debug=0;
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static int xsize=320,ysize=200,scale=1;
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int mode13h_graphics_init(char *name, int new_scale) {
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int mode;
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scale=new_scale;
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xsize=320*scale;
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ysize=200*scale;
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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(xsize, ysize, 32, mode);
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if ( sdl_screen == NULL ) {
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fprintf(stderr, "ERROR! Couldn't set %dx%d video mode: %s\n",
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xsize,ysize,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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if (name==NULL) {
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SDL_WM_SetCaption("Linux/C/SDL","unknown");
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}
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else {
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SDL_WM_SetCaption(name,name);
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}
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return 0;
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}
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int mode13h_graphics_update(void) {
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unsigned int *t_pointer;
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int x,y,temp,in_ptr,out_ptr,i,j;
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/* point to SDL output pixels */
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t_pointer=((Uint32 *)sdl_screen->pixels);
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out_ptr=0;
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for(y=0;y<200;y++) {
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for(j=0;j<scale;j++) {
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for(x=0;x<320;x++) {
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in_ptr=(y*320)+x;
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temp=(pal.red[framebuffer[in_ptr]]<<16)|
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(pal.green[framebuffer[in_ptr]]<<8)|
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(pal.blue[framebuffer[in_ptr]]<<0)|0;
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for(i=0;i<scale;i++) {
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t_pointer[out_ptr]=temp;
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out_ptr++;
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}
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}
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}
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}
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SDL_UpdateRect(sdl_screen, 0, 0, xsize, ysize);
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return 0;
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}
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/* output of vgapal https://github.com/canidlogic/vgapal */
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static unsigned char default_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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void set_default_pal(void) {
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int i;
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for(i=0;i<256;i++) {
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pal.red[i]=default_pal[i*3];
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pal.green[i]=default_pal[(i*3)+1];
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pal.blue[i]=default_pal[(i*3)+2];
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}
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return;
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}
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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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default:
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return keypressed;
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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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void framebuffer_write_20bit(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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void framebuffer_write(int address, int value) {
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if (debug) {
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if ((address<0) || (address>320*200)) {
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fprintf(stderr,
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"Error! Framebuffer write of 0x%x (%d,%d) "
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"out of bounds\n",
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address,address%320,address/320);
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return;
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}
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}
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framebuffer[address]=value;
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}
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static int dac_write_address=0,dac_write_which=0;
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static int dac_read_address=0,dac_read_which=0;
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void outp(short address, int value) {
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switch(address) {
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/* DAC read address */
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case 0x3c7:
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if (debug) fprintf(stderr,"Setting read address to %d\n",value);
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dac_read_address=value;
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dac_read_which=0;
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break;
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/* DAC write address */
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case 0x3c8:
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if (debug) fprintf(stderr,"Setting write address to %d\n",value);
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dac_write_address=value;
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dac_write_which=0;
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break;
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/* PEL/DAC data */
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/* Note colors are 0..63 */
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case 0x3c9:
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if (dac_write_which==0) {
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pal.red[dac_write_address]=value*4;
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if (debug) fprintf(stderr,"Color %d R=0x%x ",
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dac_write_address,value);
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}
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if (dac_write_which==1) {
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pal.green[dac_write_address]=value*4;
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if (debug) fprintf(stderr,"G=0x%x ",value);
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}
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if (dac_write_which==2) {
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pal.blue[dac_write_address]=value*4;
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if (debug) fprintf(stderr,"B=0x%x\n",value);
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}
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dac_write_which++;
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if (dac_write_which==3) {
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dac_write_address++;
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dac_write_which=0;
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if (dac_write_address>255) {
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if (debug) fprintf(stderr,"Palette overflow!\n");
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dac_write_address=0; /* FIXME: is this right? */
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}
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}
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break;
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default:
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printf("outp to unknown port 0x%x\n",address);
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}
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}
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int inp(short address) {
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int retval=0;
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switch(address) {
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/* DAC read address */
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case 0x3c9:
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if (dac_read_which==0) {
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retval=pal.red[dac_read_address]/4;
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if (debug) fprintf(stderr,"Color %d R=0x%x ",
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dac_read_address,retval);
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}
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if (dac_read_which==1) {
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retval=pal.green[dac_read_address]/4;
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if (debug) fprintf(stderr,"G=0x%x ",retval);
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}
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if (dac_read_which==2) {
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retval=pal.blue[dac_read_address]/4;
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if (debug) fprintf(stderr,"B=0x%x\n",retval);
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}
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dac_read_which++;
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if (dac_read_which==3) {
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dac_read_address++;
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dac_read_which=0;
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if (dac_read_address>255) {
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if (debug) fprintf(stderr,"Palette overflow!\n");
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dac_read_address=0; /* FIXME: is this right? */
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}
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}
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break;
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default:
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printf("inp from unknown port 0x%x\n",address);
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}
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return retval;
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}
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