shithub: choc

ref: b22df6a13aedecce1818c41eb38b265b066f3eda
dir: /src/v_video.c/

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// Emacs style mode select   -*- C++ -*- 
//-----------------------------------------------------------------------------
//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 2005 Simon Howard
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.
//
// DESCRIPTION:
//	Gamma correction LUT stuff.
//	Functions to draw patches (by post) directly to screen.
//	Functions to blit a block to the screen.
//
//-----------------------------------------------------------------------------




#include "i_system.h"
#include "r_local.h"

#include "doomdef.h"
#include "doomdata.h"

#include "deh_main.h"
#include "m_bbox.h"
#include "i_swap.h"
#include "i_video.h"
#include "m_misc.h"
#include "v_video.h"
#include "w_wad.h"
#include "z_zone.h"

// Each screen is [SCREENWIDTH*SCREENHEIGHT]; 
byte*				screens[5];	
 
int				dirtybox[4]; 



// Now where did these came from?
const byte gammatable[5][256] =
{
    {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,
     17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,
     33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,
     49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,
     65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,
     81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,
     97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,
     113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,
     128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,
     144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,
     160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,
     176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,
     192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,
     208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,
     224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,
     240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255},

    {2,4,5,7,8,10,11,12,14,15,16,18,19,20,21,23,24,25,26,27,29,30,31,
     32,33,34,36,37,38,39,40,41,42,44,45,46,47,48,49,50,51,52,54,55,
     56,57,58,59,60,61,62,63,64,65,66,67,69,70,71,72,73,74,75,76,77,
     78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,
     99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,
     115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,129,
     130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,
     146,147,148,148,149,150,151,152,153,154,155,156,157,158,159,160,
     161,162,163,163,164,165,166,167,168,169,170,171,172,173,174,175,
     175,176,177,178,179,180,181,182,183,184,185,186,186,187,188,189,
     190,191,192,193,194,195,196,196,197,198,199,200,201,202,203,204,
     205,205,206,207,208,209,210,211,212,213,214,214,215,216,217,218,
     219,220,221,222,222,223,224,225,226,227,228,229,230,230,231,232,
     233,234,235,236,237,237,238,239,240,241,242,243,244,245,245,246,
     247,248,249,250,251,252,252,253,254,255},

    {4,7,9,11,13,15,17,19,21,22,24,26,27,29,30,32,33,35,36,38,39,40,42,
     43,45,46,47,48,50,51,52,54,55,56,57,59,60,61,62,63,65,66,67,68,69,
     70,72,73,74,75,76,77,78,79,80,82,83,84,85,86,87,88,89,90,91,92,93,
     94,95,96,97,98,100,101,102,103,104,105,106,107,108,109,110,111,112,
     113,114,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,
     129,130,131,132,133,133,134,135,136,137,138,139,140,141,142,143,144,
     144,145,146,147,148,149,150,151,152,153,153,154,155,156,157,158,159,
     160,160,161,162,163,164,165,166,166,167,168,169,170,171,172,172,173,
     174,175,176,177,178,178,179,180,181,182,183,183,184,185,186,187,188,
     188,189,190,191,192,193,193,194,195,196,197,197,198,199,200,201,201,
     202,203,204,205,206,206,207,208,209,210,210,211,212,213,213,214,215,
     216,217,217,218,219,220,221,221,222,223,224,224,225,226,227,228,228,
     229,230,231,231,232,233,234,235,235,236,237,238,238,239,240,241,241,
     242,243,244,244,245,246,247,247,248,249,250,251,251,252,253,254,254,
     255},

    {8,12,16,19,22,24,27,29,31,34,36,38,40,41,43,45,47,49,50,52,53,55,
     57,58,60,61,63,64,65,67,68,70,71,72,74,75,76,77,79,80,81,82,84,85,
     86,87,88,90,91,92,93,94,95,96,98,99,100,101,102,103,104,105,106,107,
     108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,
     125,126,127,128,129,130,131,132,133,134,135,135,136,137,138,139,140,
     141,142,143,143,144,145,146,147,148,149,150,150,151,152,153,154,155,
     155,156,157,158,159,160,160,161,162,163,164,165,165,166,167,168,169,
     169,170,171,172,173,173,174,175,176,176,177,178,179,180,180,181,182,
     183,183,184,185,186,186,187,188,189,189,190,191,192,192,193,194,195,
     195,196,197,197,198,199,200,200,201,202,202,203,204,205,205,206,207,
     207,208,209,210,210,211,212,212,213,214,214,215,216,216,217,218,219,
     219,220,221,221,222,223,223,224,225,225,226,227,227,228,229,229,230,
     231,231,232,233,233,234,235,235,236,237,237,238,238,239,240,240,241,
     242,242,243,244,244,245,246,246,247,247,248,249,249,250,251,251,252,
     253,253,254,254,255},

    {16,23,28,32,36,39,42,45,48,50,53,55,57,60,62,64,66,68,69,71,73,75,76,
     78,80,81,83,84,86,87,89,90,92,93,94,96,97,98,100,101,102,103,105,106,
     107,108,109,110,112,113,114,115,116,117,118,119,120,121,122,123,124,
     125,126,128,128,129,130,131,132,133,134,135,136,137,138,139,140,141,
     142,143,143,144,145,146,147,148,149,150,150,151,152,153,154,155,155,
     156,157,158,159,159,160,161,162,163,163,164,165,166,166,167,168,169,
     169,170,171,172,172,173,174,175,175,176,177,177,178,179,180,180,181,
     182,182,183,184,184,185,186,187,187,188,189,189,190,191,191,192,193,
     193,194,195,195,196,196,197,198,198,199,200,200,201,202,202,203,203,
     204,205,205,206,207,207,208,208,209,210,210,211,211,212,213,213,214,
     214,215,216,216,217,217,218,219,219,220,220,221,221,222,223,223,224,
     224,225,225,226,227,227,228,228,229,229,230,230,231,232,232,233,233,
     234,234,235,235,236,236,237,237,238,239,239,240,240,241,241,242,242,
     243,243,244,244,245,245,246,246,247,247,248,248,249,249,250,250,251,
     251,252,252,253,254,254,255,255}
};


// Gamma correction level to use

int	usegamma = 0;
			 
//
// V_MarkRect 
// 
void
V_MarkRect
( int		x,
  int		y,
  int		width,
  int		height ) 
{ 
    M_AddToBox (dirtybox, x, y); 
    M_AddToBox (dirtybox, x+width-1, y+height-1); 
} 
 

//
// V_CopyRect 
// 
void
V_CopyRect
( int		srcx,
  int		srcy,
  int		srcscrn,
  int		width,
  int		height,
  int		destx,
  int		desty,
  int		destscrn ) 
{ 
    byte*	src;
    byte*	dest; 
	 
#ifdef RANGECHECK 
    if (srcx<0
	||srcx+width >SCREENWIDTH
	|| srcy<0
	|| srcy+height>SCREENHEIGHT 
	||destx<0||destx+width >SCREENWIDTH
	|| desty<0
	|| desty+height>SCREENHEIGHT 
	|| (unsigned)srcscrn>4
	|| (unsigned)destscrn>4)
    {
	I_Error ("Bad V_CopyRect");
    }
#endif 
    V_MarkRect (destx, desty, width, height); 
	 
    src = screens[srcscrn]+SCREENWIDTH*srcy+srcx; 
    dest = screens[destscrn]+SCREENWIDTH*desty+destx; 

    for ( ; height>0 ; height--) 
    { 
	memcpy (dest, src, width); 
	src += SCREENWIDTH; 
	dest += SCREENWIDTH; 
    } 
} 
 

//
// V_DrawPatch
// Masks a column based masked pic to the screen. 
//
void
V_DrawPatch
( int		x,
  int		y,
  int		scrn,
  patch_t*	patch ) 
{ 

    int		count;
    int		col; 
    column_t*	column; 
    byte*	desttop;
    byte*	dest;
    byte*	source; 
    int		w; 
	 
    y -= SHORT(patch->topoffset); 
    x -= SHORT(patch->leftoffset); 
#ifdef RANGECHECK 
    if (x<0
	||x+SHORT(patch->width) >SCREENWIDTH
	|| y<0
	|| y+SHORT(patch->height)>SCREENHEIGHT 
	|| (unsigned)scrn>4)
    {
        I_Error("Bad V_DrawPatch");
    }
#endif 
 
    if (!scrn)
	V_MarkRect (x, y, SHORT(patch->width), SHORT(patch->height)); 

    col = 0; 
    desttop = screens[scrn]+y*SCREENWIDTH+x; 
	 
    w = SHORT(patch->width); 

    for ( ; col<w ; x++, col++, desttop++)
    { 
	column = (column_t *)((byte *)patch + LONG(patch->columnofs[col])); 
 
	// step through the posts in a column 
	while (column->topdelta != 0xff ) 
	{ 
	    source = (byte *)column + 3; 
	    dest = desttop + column->topdelta*SCREENWIDTH; 
	    count = column->length; 
			 
	    while (count--) 
	    { 
		*dest = *source++; 
		dest += SCREENWIDTH; 
	    } 
	    column = (column_t *)(  (byte *)column + column->length 
				    + 4 ); 
	} 
    }			 
} 
 
//
// V_DrawPatchFlipped 
// Masks a column based masked pic to the screen.
// Flips horizontally, e.g. to mirror face.
//
void
V_DrawPatchFlipped
( int		x,
  int		y,
  int		scrn,
  patch_t*	patch ) 
{ 

    int		count;
    int		col; 
    column_t*	column; 
    byte*	desttop;
    byte*	dest;
    byte*	source; 
    int		w; 
	 
    y -= SHORT(patch->topoffset); 
    x -= SHORT(patch->leftoffset); 
#ifdef RANGECHECK 
    if (x<0
	||x+SHORT(patch->width) >SCREENWIDTH
	|| y<0
	|| y+SHORT(patch->height)>SCREENHEIGHT 
	|| (unsigned)scrn>4)
    {
        I_Error("Bad V_DrawPatchFlipped");
    }
#endif 
 
    if (!scrn)
	V_MarkRect (x, y, SHORT(patch->width), SHORT(patch->height)); 

    col = 0; 
    desttop = screens[scrn]+y*SCREENWIDTH+x; 
	 
    w = SHORT(patch->width); 

    for ( ; col<w ; x++, col++, desttop++) 
    { 
	column = (column_t *)((byte *)patch + LONG(patch->columnofs[w-1-col])); 
 
	// step through the posts in a column 
	while (column->topdelta != 0xff ) 
	{ 
	    source = (byte *)column + 3; 
	    dest = desttop + column->topdelta*SCREENWIDTH; 
	    count = column->length; 
			 
	    while (count--) 
	    { 
		*dest = *source++; 
		dest += SCREENWIDTH; 
	    } 
	    column = (column_t *)(  (byte *)column + column->length 
				    + 4 ); 
	} 
    }			 
} 
 


//
// V_DrawPatchDirect
// Draws directly to the screen on the pc. 
//
void
V_DrawPatchDirect
( int		x,
  int		y,
  int		scrn,
  patch_t*	patch ) 
{
    V_DrawPatch (x,y,scrn, patch); 

    /*
    int		count;
    int		col; 
    column_t*	column; 
    byte*	desttop;
    byte*	dest;
    byte*	source; 
    int		w; 
	 
    y -= SHORT(patch->topoffset); 
    x -= SHORT(patch->leftoffset); 

#ifdef RANGECHECK 
    if (x<0
	||x+SHORT(patch->width) >SCREENWIDTH
	|| y<0
	|| y+SHORT(patch->height)>SCREENHEIGHT 
	|| (unsigned)scrn>4)
    {
	I_Error ("Bad V_DrawPatchDirect");
    }
#endif 
 
    //	V_MarkRect (x, y, SHORT(patch->width), SHORT(patch->height)); 
    desttop = destscreen + y*SCREENWIDTH/4 + (x>>2); 
	 
    w = SHORT(patch->width); 
    for ( col = 0 ; col<w ; col++) 
    { 
	outp (SC_INDEX+1,1<<(x&3)); 
	column = (column_t *)((byte *)patch + LONG(patch->columnofs[col])); 
 
	// step through the posts in a column 
	 
	while (column->topdelta != 0xff ) 
	{ 
	    source = (byte *)column + 3; 
	    dest = desttop + column->topdelta*SCREENWIDTH/4; 
	    count = column->length; 
 
	    while (count--) 
	    { 
		*dest = *source++; 
		dest += SCREENWIDTH/4; 
	    } 
	    column = (column_t *)(  (byte *)column + column->length 
				    + 4 ); 
	} 
	if ( ((++x)&3) == 0 ) 
	    desttop++;	// go to next byte, not next plane 
    }*/ 
} 
 


//
// V_DrawBlock
// Draw a linear block of pixels into the view buffer.
//
void
V_DrawBlock
( int		x,
  int		y,
  int		scrn,
  int		width,
  int		height,
  byte*		src ) 
{ 
    byte*	dest; 
	 
#ifdef RANGECHECK 
    if (x<0
	||x+width >SCREENWIDTH
	|| y<0
	|| y+height>SCREENHEIGHT 
	|| (unsigned)scrn>4 )
    {
	I_Error ("Bad V_DrawBlock");
    }
#endif 
 
    V_MarkRect (x, y, width, height); 
 
    dest = screens[scrn] + y*SCREENWIDTH+x; 

    while (height--) 
    { 
	memcpy (dest, src, width); 
	src += width; 
	dest += SCREENWIDTH; 
    } 
} 
 


//
// V_GetBlock
// Gets a linear block of pixels from the view buffer.
//
void
V_GetBlock
( int		x,
  int		y,
  int		scrn,
  int		width,
  int		height,
  byte*		dest ) 
{ 
    byte*	src; 
	 
#ifdef RANGECHECK 
    if (x<0
	||x+width >SCREENWIDTH
	|| y<0
	|| y+height>SCREENHEIGHT 
	|| (unsigned)scrn>4 )
    {
	I_Error ("Bad V_DrawBlock");
    }
#endif 
 
    src = screens[scrn] + y*SCREENWIDTH+x; 

    while (height--) 
    { 
	memcpy (dest, src, width); 
	src += SCREENWIDTH; 
	dest += width; 
    } 
} 




//
// V_Init
// 
void V_Init (void) 
{ 
    int		i;
    byte*	base;
		
    // stick these in low dos memory on PCs

    base = Z_Malloc(SCREENWIDTH * SCREENHEIGHT * 4, PU_STATIC, NULL);

    for (i=0 ; i<4 ; i++)
    {
	screens[i] = base + i*SCREENWIDTH*SCREENHEIGHT;
    }
}

//
// SCREEN SHOTS
//

typedef struct
{
    char		manufacturer;
    char		version;
    char		encoding;
    char		bits_per_pixel;

    unsigned short	xmin;
    unsigned short	ymin;
    unsigned short	xmax;
    unsigned short	ymax;
    
    unsigned short	hres;
    unsigned short	vres;

    unsigned char	palette[48];
    
    char		reserved;
    char		color_planes;
    unsigned short	bytes_per_line;
    unsigned short	palette_type;
    
    char		filler[58];
    unsigned char	data;		// unbounded
} PACKEDATTR pcx_t;


//
// WritePCXfile
//

void WritePCXfile(char *filename, byte *data,
                  int width, int height,
                  byte *palette)
{
    int		i;
    int		length;
    pcx_t*	pcx;
    byte*	pack;
	
    pcx = Z_Malloc (width*height*2+1000, PU_STATIC, NULL);

    pcx->manufacturer = 0x0a;		// PCX id
    pcx->version = 5;			// 256 color
    pcx->encoding = 1;			// uncompressed
    pcx->bits_per_pixel = 8;		// 256 color
    pcx->xmin = 0;
    pcx->ymin = 0;
    pcx->xmax = SHORT(width-1);
    pcx->ymax = SHORT(height-1);
    pcx->hres = SHORT(width);
    pcx->vres = SHORT(height);
    memset (pcx->palette,0,sizeof(pcx->palette));
    pcx->color_planes = 1;		// chunky image
    pcx->bytes_per_line = SHORT(width);
    pcx->palette_type = SHORT(2);	// not a grey scale
    memset (pcx->filler,0,sizeof(pcx->filler));

    // pack the image
    pack = &pcx->data;
	
    for (i=0 ; i<width*height ; i++)
    {
	if ( (*data & 0xc0) != 0xc0)
	    *pack++ = *data++;
	else
	{
	    *pack++ = 0xc1;
	    *pack++ = *data++;
	}
    }
    
    // write the palette
    *pack++ = 0x0c;	// palette ID byte
    for (i=0 ; i<768 ; i++)
	*pack++ = *palette++;
    
    // write output file
    length = pack - (byte *)pcx;
    M_WriteFile (filename, pcx, length);

    Z_Free (pcx);
}

//
// V_ScreenShot
//

void V_ScreenShot (void)
{
    int		i;
    byte*	linear;
    char	lbmname[12];
    
    // munge planar buffer to linear
    linear = screens[2];
    I_ReadScreen (linear);
    
    // find a file name to save it to
    strcpy(lbmname,"DOOM00.pcx");
		
    for (i=0 ; i<=99 ; i++)
    {
	lbmname[4] = i/10 + '0';
	lbmname[5] = i%10 + '0';
	if (!M_FileExists(lbmname))
	    break;	// file doesn't exist
    }
    if (i==100)
	I_Error ("V_ScreenShot: Couldn't create a PCX");
    
    // save the pcx file
    WritePCXfile (lbmname, linear,
		  SCREENWIDTH, SCREENHEIGHT,
		  W_CacheLumpName (DEH_String("PLAYPAL"), PU_CACHE));
}