Message-ID:	<36CAC23E.3B89@club-internet.fr>
Date:	Wed, 17 Feb 1999 14:21:02 +0100
From:	Ludvig Larsson <ludvig AT club-internet DOT fr>
Organization:	Faas-Goldhart
X-Mailer:	Mozilla 3.01C-CLUB (Win95; I)
MIME-Version:	1.0
To:	djgpp AT delorie DOT com
Subject:	Re: Line frame buffer speed problem
References:	<3 DOT 0 DOT 1 DOT 32 DOT 19990216140256 DOT 0091b100 AT iut DOT ujf-grenoble DOT fr>
Reply-To:	djgpp AT delorie DOT com

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You have to include the "globals.h" in your files to de able to
use the global selector video_ds.

HTH

Ludvig Larsson

ps. Don't know if graphics_off() and graphics_on() works as they
should. But the initial call to init_graphics() (You must call
this function to get the video_ds right) witt (if possible)
put the mode inte graphics and init the selector(video_ds).

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/***** Globals: *****/

/* include "globals.h to get access to video_ds !!! */



/* Graphics */
#define max_nr_of_sprites 2000
#define max_nr_of_bmps 300

short *double_buffer;
int *y_screen_start;    /* lookup for plots */
int video_ds;    /* lfb-start */
short *bmp[max_nr_of_bmps];
int nr_of_bmps;

typedef struct 
{
 int x,y,height;
 int image;
}sprite_struct;
sprite_struct sprite[max_nr_of_sprites]; /* Is this okay? */


/* Mouse */

int mouse_x,mouse_y;
int mouse_x1,mouse_y1,mouse_x2,mouse_y2;
int mouse_on;


/* Maps & Levels */

short *compressed_map;


/* Div */

//void goto_error(char*);
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#include <stdio.h>
#include <stdlib.h>
#include <pc.h>
#include <dpmi.h>
#include <go32.h>
#include <dos.h>
#include <sys/farptr.h>
#include <fcntl.h>
#include <share.h>
#include <sys/stat.h>
#include <sys/movedata.h>
#include <conio.h>
#include <float.h>
#include <string.h>
#include "globals.h"


#define BYTE unsigned char

void graphics_off(void)
{
 __dpmi_regs reg;
 reg.x.ax = 0x0003;
 __dpmi_int(0x10,&reg);

/* Must maybe Free the descriptor? */

}

void goto_error(char *error_string)
{
 graphics_off();
 printf("%s\n",error_string);
 getch();
 exit(1);
}

typedef struct {
  unsigned ModeAttributes;
  unsigned granularity,startseg,farfunc;
  short bscanline;
  short XResolution;
  short YResolution;
  short charpixels;
  unsigned bogus1,bogus2,bogus3,bogus4;
  unsigned PhysBasePtr;
  char bogus[228];
} ModeInfoBlock;

unsigned int ADDR;
int width,height;

ModeInfoBlock *get_mode_info(int mode)
{
	static ModeInfoBlock info;
	__dpmi_regs r;

	/* Use the transfer buffer to store the results of VBE call */
	r.x.ax = 0x4F01;
	r.x.cx = mode;
	r.x.es = __tb / 16;
	r.x.di = 0;
	__dpmi_int(0x10, &r);
	if(r.h.ah) return 0;
	dosmemget(__tb, sizeof(ModeInfoBlock), &info);
	return &info;
}

void init_lfb_graphics(void)
{
	__dpmi_meminfo info;
	__dpmi_regs reg;
	ModeInfoBlock *mb;

	mb=get_mode_info(0x111);

	if (!mb) {
	  printf("Get VESA mode info failed.\n");
	  exit(1);
	}
	if (!(mb->ModeAttributes & 0x80)) {
	  printf("Linear frame buffer not supported for VESA mode.\n");
	  exit(1);
	}

	width=mb->XResolution;
	height=mb->YResolution;
	info.size=width*height;
	info.address=mb->PhysBasePtr;
	if(__dpmi_physical_address_mapping(&info) == -1) {
	  printf("Physical mapping of address 0x%x failed!\n",mb->PhysBasePtr);
	  exit(2);
	}
	ADDR=info.address;		/* Updated by above call */
	printf("Vesa mode 0x111: %d x %d, linear frame: 0x%x\n",width,height,ADDR);
	//delay(5500);

	reg.x.ax=0x4f02;
	reg.x.bx=0x4111;		/* mode plus linear enable bit */
	__dpmi_int(0x10,&reg);		/* set the mode */
	if(reg.h.al != 0x4f || reg.h.ah) {
	  printf("Mode set failed!\n");
	  exit(3);
	}
}

int lfb_main(void)
{
  int i;
  printf("Checks mode 0x111(640x480x16bits) VBE 2.0 linear buffer support\n");
  delay(3000);
   init_lfb_graphics();
   /* Note: Video mode probably doesn't support text writes at this point */
   video_ds = __dpmi_allocate_ldt_descriptors(1);
   __dpmi_set_segment_base_address(video_ds,ADDR);
   ADDR = 0;	/* basis now zero from selector */
   __dpmi_set_segment_limit(video_ds,(width*height*2)|0xfff); /* *2(16bits) ? */

  // _farpokew(video_ds,0,65535);  /* put a pixel at top corner */

 return(0);
}

void graphics_on(void) /* Does this work? */
{
 lfb_main();
}

plot16(int x,int y,int color)
{
 //if((x>=0)&&(x<640)&&(y>=0)&&(y<480)) /* Safety Check */
  _farpokew(video_ds,x*2+y*1280,color);
}

void clear_screen(void)
{
 int x,y;
// for(i=0;i<640*240;i+=4)
//  _farpokel(video_ds,i,0);
 for(y=0;y<480;y++)
  for(x=0;x<640;x++)
   plot16(x,y,0);
}


int init_graphics()
{
 int i;
 lfb_main();
 y_screen_start=malloc(1024*4);
 for(i=0;i<480;i++)
  y_screen_start[i]=1280*i;
}






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