engine.cpp

超级玛丽游戏源码

#include <dos.h>
#include <alloc.h>
#include <conio.h>
#include <mem.h>
#include "engine.h"

BITMAP *screen;
int set_video_mode(int w,int h)
{
  char mode;
  if(w==320&&h==200)
    mode=0x13;
  else return 0;
  union REGS inregs,outregs;
  inregs.h.ah=0;
  inregs.h.al=mode;
  int86(0x10,&inregs,&outregs);
  screen=(BITMAP *)malloc(sizeof(screen));
  screen->type=VIDEO_MEM;
  screen->w=w;
  screen->h=h;
  screen->buffer=(char far *)0xa0000000L;
  return 1;
}



BITMAP *creat_bitmap(int w,int h)
{
     BITMAP *temp;
     temp=(BITMAP *)malloc(sizeof(temp));
     if((temp->buffer=(char far *)farmalloc((long)w*(long)h+1))==NULL)
       return(0);
     temp->w=w;
     temp->h=h;
     temp->type=MEM;
     return temp;
}


int blit(BITMAP *dest,BITMAP *source,int x1,int y1,int x2,int y2,int w,int h)
{
  unsigned offset_d,offset_s;
  int i;

  if(x1>dest->w)return 0;

  if(x1<0){w+=x1;x1=0;}
  if(w<0)return 0;

  if(x1+w>dest->w)w=dest->w-x1;
  if(w<0)return 0;

  if(y1<0){h+=y1;y1=0;}
  if(h<0)return 0;

  if(y1+h>dest->h)h=dest->h-y1;
  if(h<0)return 0;

  offset_d=x1+y1*dest->w;
  offset_s=x2+y2*source->w;

  for(i=0;i<h;i++)
  {
    _fmemcpy(dest->buffer+offset_d,source->buffer+offset_s,w);
    offset_d+=dest->w;
    offset_s+=source->w;
  }
 return 1;
}

int blit_mask(BITMAP *dest,BITMAP *source,int x1,int y1,int x2,int y2,int w,int h)
{
  unsigned offset_d,offset_s;
  int i,j;
  char data;
  if(x1>dest->w)return 0;

  if(x1<0){w+=x1;x1=0;}
  if(w<0)return 0;

  if(x1+w>dest->w)w=dest->w-x1;
  if(w<0)return 0;

  if(y1<0){h+=y1;y1=0;}
  if(h<0)return 0;

  if(y1+h>dest->h)h=dest->h-y1;
  if(h<0)return 0;

  offset_d=x1+y1*dest->w;
  offset_s=x2+y2*source->w;

  for(i=0;i<h;i++)
  {
    for(j=0;j<w;j++)
     if((data=source->buffer[offset_s+j]))
       dest->buffer[offset_d+j]=data;
    offset_d+=dest->w;
    offset_s+=source->w;
  }
 return 1;
}


void del_bitmap(BITMAP *temp)
{
 if(temp->buffer)farfree(temp->buffer);
 if(temp)free(temp);
}


void wait_vsync(void)
    {
      while(inp(0x3da)&0x08);
      while(!(inp(0x3da)&0x08));
    }

void set_text_mode()
{
 asm{
    XOR AH,AH
    MOV AL,3
    MOV BL,8
    INT 10H
    }
}

void clean_bitmap(BITMAP *temp,int col)
{
 _fmemset(temp->buffer,col,temp->w*temp->h);
}