ref: bb66e1f0f272824e5850e760a8788daaba7641a2
dir: /vl.c/
// ID_VL.C
#include <dos.h>
#include <alloc.h>
#include <mem.h>
#include <string.h>
#include "ID_HEADS.H"
#include "ID_VL.H"
#pragma hdrstop
//
// SC_INDEX is expected to stay at SC_MAPMASK for proper operation
//
unsigned bufferofs;
unsigned displayofs,pelpan;
unsigned screenseg=SCREENSEG; // set to 0xa000 for asm convenience
unsigned linewidth;
unsigned ylookup[MAXSCANLINES];
boolean screenfaded;
unsigned bordercolor;
boolean fastpalette; // if true, use outsb to set
byte far palette1[256][3],far palette2[256][3];
//===========================================================================
// asm
int VL_VideoID (void);
void VL_SetCRTC (int crtc);
void VL_SetScreen (int crtc, int pelpan);
void VL_WaitVBL (int vbls);
//===========================================================================
/*
=======================
=
= VL_Startup
=
=======================
*/
#if 0
void VL_Startup (void)
{
if ( !MS_CheckParm ("HIDDENCARD") && VL_VideoID () != 5)
MS_Quit ("You need a VGA graphics card to run this!");
asm cld; // all string instructions assume forward
}
#endif
/*
=======================
=
= VL_Startup // WOLFENSTEIN HACK
=
=======================
*/
static char *ParmStrings[] = {"HIDDENCARD",""};
void VL_Startup (void)
{
int i,videocard;
asm cld;
videocard = VL_VideoID ();
for (i = 1;i < _argc;i++)
if (US_CheckParm(_argv[i],ParmStrings) == 0)
{
videocard = 5;
break;
}
if (videocard != 5)
Quit ("Improper video card! If you really have a VGA card that I am not \n"
"detecting, use the -HIDDENCARD command line parameter!");
}
/*
=======================
=
= VL_Shutdown
=
=======================
*/
void VL_Shutdown (void)
{
VL_SetTextMode ();
}
/*
=======================
=
= VL_SetVGAPlaneMode
=
=======================
*/
void VL_SetVGAPlaneMode (void)
{
asm mov ax,0x13
asm int 0x10
VL_DePlaneVGA ();
VGAMAPMASK(15);
VL_SetLineWidth (40);
}
/*
=======================
=
= VL_SetTextMode
=
=======================
*/
void VL_SetTextMode (void)
{
asm mov ax,3
asm int 0x10
}
//===========================================================================
/*
=================
=
= VL_ClearVideo
=
= Fill the entire video buffer with a given color
=
=================
*/
void VL_ClearVideo (byte color)
{
asm mov dx,GC_INDEX
asm mov al,GC_MODE
asm out dx,al
asm inc dx
asm in al,dx
asm and al,0xfc // write mode 0 to store directly to video
asm out dx,al
asm mov dx,SC_INDEX
asm mov ax,SC_MAPMASK+15*256
asm out dx,ax // write through all four planes
asm mov ax,SCREENSEG
asm mov es,ax
asm mov al,[color]
asm mov ah,al
asm mov cx,0x8000 // 0x8000 words, clearing 8 video bytes/word
asm xor di,di
asm rep stosw
}
/*
=============================================================================
VGA REGISTER MANAGEMENT ROUTINES
=============================================================================
*/
/*
=================
=
= VL_DePlaneVGA
=
=================
*/
void VL_DePlaneVGA (void)
{
//
// change CPU addressing to non linear mode
//
//
// turn off chain 4 and odd/even
//
outportb (SC_INDEX,SC_MEMMODE);
outportb (SC_INDEX+1,(inportb(SC_INDEX+1)&~8)|4);
outportb (SC_INDEX,SC_MAPMASK); // leave this set throughought
//
// turn off odd/even and set write mode 0
//
outportb (GC_INDEX,GC_MODE);
outportb (GC_INDEX+1,inportb(GC_INDEX+1)&~0x13);
//
// turn off chain
//
outportb (GC_INDEX,GC_MISCELLANEOUS);
outportb (GC_INDEX+1,inportb(GC_INDEX+1)&~2);
//
// clear the entire buffer space, because int 10h only did 16 k / plane
//
VL_ClearVideo (0);
//
// change CRTC scanning from doubleword to byte mode, allowing >64k scans
//
outportb (CRTC_INDEX,CRTC_UNDERLINE);
outportb (CRTC_INDEX+1,inportb(CRTC_INDEX+1)&~0x40);
outportb (CRTC_INDEX,CRTC_MODE);
outportb (CRTC_INDEX+1,inportb(CRTC_INDEX+1)|0x40);
}
//===========================================================================
/*
====================
=
= VL_SetLineWidth
=
= Line witdh is in WORDS, 40 words is normal width for vgaplanegr
=
====================
*/
void VL_SetLineWidth (unsigned width)
{
int i,offset;
//
// set wide virtual screen
//
outport (CRTC_INDEX,CRTC_OFFSET+width*256);
//
// set up lookup tables
//
linewidth = width*2;
offset = 0;
for (i=0;i<MAXSCANLINES;i++)
{
ylookup[i]=offset;
offset += linewidth;
}
}
/*
====================
=
= VL_SetSplitScreen
=
====================
*/
void VL_SetSplitScreen (int linenum)
{
VL_WaitVBL (1);
linenum=linenum*2-1;
outportb (CRTC_INDEX,CRTC_LINECOMPARE);
outportb (CRTC_INDEX+1,linenum % 256);
outportb (CRTC_INDEX,CRTC_OVERFLOW);
outportb (CRTC_INDEX+1, 1+16*(linenum/256));
outportb (CRTC_INDEX,CRTC_MAXSCANLINE);
outportb (CRTC_INDEX+1,inportb(CRTC_INDEX+1) & (255-64));
}
/*
=============================================================================
PALETTE OPS
To avoid snow, do a WaitVBL BEFORE calling these
=============================================================================
*/
/*
=================
=
= VL_FillPalette
=
=================
*/
void VL_FillPalette (int red, int green, int blue)
{
int i;
outportb (PEL_WRITE_ADR,0);
for (i=0;i<256;i++)
{
outportb (PEL_DATA,red);
outportb (PEL_DATA,green);
outportb (PEL_DATA,blue);
}
}
//===========================================================================
/*
=================
=
= VL_SetColor
=
=================
*/
void VL_SetColor (int color, int red, int green, int blue)
{
outportb (PEL_WRITE_ADR,color);
outportb (PEL_DATA,red);
outportb (PEL_DATA,green);
outportb (PEL_DATA,blue);
}
//===========================================================================
/*
=================
=
= VL_GetColor
=
=================
*/
void VL_GetColor (int color, int *red, int *green, int *blue)
{
outportb (PEL_READ_ADR,color);
*red = inportb (PEL_DATA);
*green = inportb (PEL_DATA);
*blue = inportb (PEL_DATA);
}
//===========================================================================
/*
=================
=
= VL_SetPalette
=
= If fast palette setting has been tested for, it is used
= (some cards don't like outsb palette setting)
=
=================
*/
void VL_SetPalette (byte far *palette)
{
int i;
// outportb (PEL_WRITE_ADR,0);
// for (i=0;i<768;i++)
// outportb(PEL_DATA,*palette++);
asm mov dx,PEL_WRITE_ADR
asm mov al,0
asm out dx,al
asm mov dx,PEL_DATA
asm lds si,[palette]
asm test [ss:fastpalette],1
asm jz slowset
//
// set palette fast for cards that can take it
//
asm mov cx,768
asm rep outsb
asm jmp done
//
// set palette slowly for some video cards
//
slowset:
asm mov cx,256
setloop:
asm lodsb
asm out dx,al
asm lodsb
asm out dx,al
asm lodsb
asm out dx,al
asm loop setloop
done:
asm mov ax,ss
asm mov ds,ax
}
//===========================================================================
/*
=================
=
= VL_GetPalette
=
= This does not use the port string instructions,
= due to some incompatabilities
=
=================
*/
void VL_GetPalette (byte far *palette)
{
int i;
outportb (PEL_READ_ADR,0);
for (i=0;i<768;i++)
*palette++ = inportb(PEL_DATA);
}
//===========================================================================
/*
=================
=
= VL_FadeOut
=
= Fades the current palette to the given color in the given number of steps
=
=================
*/
void VL_FadeOut (int start, int end, int red, int green, int blue, int steps)
{
int i,j,orig,delta;
byte far *origptr, far *newptr;
VL_WaitVBL(1);
VL_GetPalette (&palette1[0][0]);
_fmemcpy (palette2,palette1,768);
//
// fade through intermediate frames
//
for (i=0;i<steps;i++)
{
origptr = &palette1[start][0];
newptr = &palette2[start][0];
for (j=start;j<=end;j++)
{
orig = *origptr++;
delta = red-orig;
*newptr++ = orig + delta * i / steps;
orig = *origptr++;
delta = green-orig;
*newptr++ = orig + delta * i / steps;
orig = *origptr++;
delta = blue-orig;
*newptr++ = orig + delta * i / steps;
}
VL_WaitVBL(1);
VL_SetPalette (&palette2[0][0]);
}
//
// final color
//
VL_FillPalette (red,green,blue);
screenfaded = true;
}
/*
=================
=
= VL_FadeIn
=
=================
*/
void VL_FadeIn (int start, int end, byte far *palette, int steps)
{
int i,j,delta;
VL_WaitVBL(1);
VL_GetPalette (&palette1[0][0]);
_fmemcpy (&palette2[0][0],&palette1[0][0],sizeof(palette1));
start *= 3;
end = end*3+2;
//
// fade through intermediate frames
//
for (i=0;i<steps;i++)
{
for (j=start;j<=end;j++)
{
delta = palette[j]-palette1[0][j];
palette2[0][j] = palette1[0][j] + delta * i / steps;
}
VL_WaitVBL(1);
VL_SetPalette (&palette2[0][0]);
}
//
// final color
//
VL_SetPalette (palette);
screenfaded = false;
}
/*
=================
=
= VL_TestPaletteSet
=
= Sets the palette with outsb, then reads it in and compares
= If it compares ok, fastpalette is set to true.
=
=================
*/
void VL_TestPaletteSet (void)
{
int i;
for (i=0;i<768;i++)
palette1[0][i] = i;
fastpalette = true;
VL_SetPalette (&palette1[0][0]);
VL_GetPalette (&palette2[0][0]);
if (_fmemcmp (&palette1[0][0],&palette2[0][0],768))
fastpalette = false;
}
/*
==================
=
= VL_ColorBorder
=
==================
*/
void VL_ColorBorder (int color)
{
_AH=0x10;
_AL=1;
_BH=color;
geninterrupt (0x10);
bordercolor = color;
}
/*
=============================================================================
PIXEL OPS
=============================================================================
*/
byte pixmasks[4] = {1,2,4,8};
byte leftmasks[4] = {15,14,12,8};
byte rightmasks[4] = {1,3,7,15};
/*
=================
=
= VL_Plot
=
=================
*/
void VL_Plot (int x, int y, int color)
{
byte mask;
mask = pixmasks[x&3];
VGAMAPMASK(mask);
*(byte far *)MK_FP(SCREENSEG,bufferofs+(ylookup[y]+(x>>2))) = color;
VGAMAPMASK(15);
}
/*
=================
=
= VL_Hlin
=
=================
*/
void VL_Hlin (unsigned x, unsigned y, unsigned width, unsigned color)
{
unsigned xbyte;
byte far *dest;
byte leftmask,rightmask;
int midbytes;
xbyte = x>>2;
leftmask = leftmasks[x&3];
rightmask = rightmasks[(x+width-1)&3];
midbytes = ((x+width+3)>>2) - xbyte - 2;
dest = MK_FP(SCREENSEG,bufferofs+ylookup[y]+xbyte);
if (midbytes<0)
{
// all in one byte
VGAMAPMASK(leftmask&rightmask);
*dest = color;
VGAMAPMASK(15);
return;
}
VGAMAPMASK(leftmask);
*dest++ = color;
VGAMAPMASK(15);
_fmemset (dest,color,midbytes);
dest+=midbytes;
VGAMAPMASK(rightmask);
*dest = color;
VGAMAPMASK(15);
}
/*
=================
=
= VL_Vlin
=
=================
*/
void VL_Vlin (int x, int y, int height, int color)
{
byte far *dest,mask;
mask = pixmasks[x&3];
VGAMAPMASK(mask);
dest = MK_FP(SCREENSEG,bufferofs+ylookup[y]+(x>>2));
while (height--)
{
*dest = color;
dest += linewidth;
}
VGAMAPMASK(15);
}
/*
=================
=
= VL_Bar
=
=================
*/
void VL_Bar (int x, int y, int width, int height, int color)
{
byte far *dest;
byte leftmask,rightmask;
int midbytes,linedelta;
leftmask = leftmasks[x&3];
rightmask = rightmasks[(x+width-1)&3];
midbytes = ((x+width+3)>>2) - (x>>2) - 2;
linedelta = linewidth-(midbytes+1);
dest = MK_FP(SCREENSEG,bufferofs+ylookup[y]+(x>>2));
if (midbytes<0)
{
// all in one byte
VGAMAPMASK(leftmask&rightmask);
while (height--)
{
*dest = color;
dest += linewidth;
}
VGAMAPMASK(15);
return;
}
while (height--)
{
VGAMAPMASK(leftmask);
*dest++ = color;
VGAMAPMASK(15);
_fmemset (dest,color,midbytes);
dest+=midbytes;
VGAMAPMASK(rightmask);
*dest = color;
dest+=linedelta;
}
VGAMAPMASK(15);
}
/*
============================================================================
MEMORY OPS
============================================================================
*/
/*
=================
=
= VL_MemToLatch
=
=================
*/
void VL_MemToLatch (byte far *source, int width, int height, unsigned dest)
{
unsigned count;
byte plane,mask;
count = ((width+3)/4)*height;
mask = 1;
for (plane = 0; plane<4 ; plane++)
{
VGAMAPMASK(mask);
mask <<= 1;
asm mov cx,count
asm mov ax,SCREENSEG
asm mov es,ax
asm mov di,[dest]
asm lds si,[source]
asm rep movsb
asm mov ax,ss
asm mov ds,ax
source+= count;
}
}
//===========================================================================
/*
=================
=
= VL_MemToScreen
=
= Draws a block of data to the screen.
=
=================
*/
void VL_MemToScreen (byte far *source, int width, int height, int x, int y)
{
byte far *screen,far *dest,mask;
int plane;
width>>=2;
dest = MK_FP(SCREENSEG,bufferofs+ylookup[y]+(x>>2) );
mask = 1 << (x&3);
for (plane = 0; plane<4; plane++)
{
VGAMAPMASK(mask);
mask <<= 1;
if (mask == 16)
mask = 1;
screen = dest;
for (y=0;y<height;y++,screen+=linewidth,source+=width)
_fmemcpy (screen,source,width);
}
}
//==========================================================================
/*
=================
=
= VL_MaskedToScreen
=
= Masks a block of main memory to the screen.
=
=================
*/
void VL_MaskedToScreen (byte far *source, int width, int height, int x, int y)
{
byte far *screen,far *dest,mask;
byte far *maskptr;
int plane;
width>>=2;
dest = MK_FP(SCREENSEG,bufferofs+ylookup[y]+(x>>2) );
// mask = 1 << (x&3);
// maskptr = source;
for (plane = 0; plane<4; plane++)
{
VGAMAPMASK(mask);
mask <<= 1;
if (mask == 16)
mask = 1;
screen = dest;
for (y=0;y<height;y++,screen+=linewidth,source+=width)
_fmemcpy (screen,source,width);
}
}
//==========================================================================
/*
=================
=
= VL_LatchToScreen
=
=================
*/
void VL_LatchToScreen (unsigned source, int width, int height, int x, int y)
{
VGAWRITEMODE(1);
VGAMAPMASK(15);
asm mov di,[y] // dest = bufferofs+ylookup[y]+(x>>2)
asm shl di,1
asm mov di,[WORD PTR ylookup+di]
asm add di,[bufferofs]
asm mov ax,[x]
asm shr ax,2
asm add di,ax
asm mov si,[source]
asm mov ax,[width]
asm mov bx,[linewidth]
asm sub bx,ax
asm mov dx,[height]
asm mov cx,SCREENSEG
asm mov ds,cx
asm mov es,cx
drawline:
asm mov cx,ax
asm rep movsb
asm add di,bx
asm dec dx
asm jnz drawline
asm mov ax,ss
asm mov ds,ax
VGAWRITEMODE(0);
}
//===========================================================================
#if 0
/*
=================
=
= VL_ScreenToScreen
=
=================
*/
void VL_ScreenToScreen (unsigned source, unsigned dest,int width, int height)
{
VGAWRITEMODE(1);
VGAMAPMASK(15);
asm mov si,[source]
asm mov di,[dest]
asm mov ax,[width]
asm mov bx,[linewidth]
asm sub bx,ax
asm mov dx,[height]
asm mov cx,SCREENSEG
asm mov ds,cx
asm mov es,cx
drawline:
asm mov cx,ax
asm rep movsb
asm add si,bx
asm add di,bx
asm dec dx
asm jnz drawline
asm mov ax,ss
asm mov ds,ax
VGAWRITEMODE(0);
}
#endif
/*
=============================================================================
STRING OUTPUT ROUTINES
=============================================================================
*/
/*
===================
=
= VL_DrawTile8String
=
===================
*/
void VL_DrawTile8String (char *str, char far *tile8ptr, int printx, int printy)
{
int i;
unsigned far *dest,far *screen,far *src;
dest = MK_FP(SCREENSEG,bufferofs+ylookup[printy]+(printx>>2));
while (*str)
{
src = (unsigned far *)(tile8ptr + (*str<<6));
// each character is 64 bytes
VGAMAPMASK(1);
screen = dest;
for (i=0;i<8;i++,screen+=linewidth)
*screen = *src++;
VGAMAPMASK(2);
screen = dest;
for (i=0;i<8;i++,screen+=linewidth)
*screen = *src++;
VGAMAPMASK(4);
screen = dest;
for (i=0;i<8;i++,screen+=linewidth)
*screen = *src++;
VGAMAPMASK(8);
screen = dest;
for (i=0;i<8;i++,screen+=linewidth)
*screen = *src++;
str++;
printx += 8;
dest+=2;
}
}
/*
===================
=
= VL_DrawLatch8String
=
===================
*/
void VL_DrawLatch8String (char *str, unsigned tile8ptr, int printx, int printy)
{
int i;
unsigned src,dest;
dest = bufferofs+ylookup[printy]+(printx>>2);
VGAWRITEMODE(1);
VGAMAPMASK(15);
while (*str)
{
src = tile8ptr + (*str<<4); // each character is 16 latch bytes
asm mov si,[src]
asm mov di,[dest]
asm mov dx,[linewidth]
asm mov ax,SCREENSEG
asm mov ds,ax
asm lodsw
asm mov [di],ax
asm add di,dx
asm lodsw
asm mov [di],ax
asm add di,dx
asm lodsw
asm mov [di],ax
asm add di,dx
asm lodsw
asm mov [di],ax
asm add di,dx
asm lodsw
asm mov [di],ax
asm add di,dx
asm lodsw
asm mov [di],ax
asm add di,dx
asm lodsw
asm mov [di],ax
asm add di,dx
asm lodsw
asm mov [di],ax
asm add di,dx
asm mov ax,ss
asm mov ds,ax
str++;
printx += 8;
dest+=2;
}
VGAWRITEMODE(0);
}
/*
===================
=
= VL_SizeTile8String
=
===================
*/
void VL_SizeTile8String (char *str, int *width, int *height)
{
*height = 8;
*width = 8*strlen(str);
}