/* Emacs style mode select   -*- C++ -*- */
/*-----------------------------------------------------------------------------*/

/* $Id:$*/

/* Copyright (C) 1993-1996 by id Software, Inc.*/

/* This source is available for distribution and/or modification*/
/* only under the terms of the DOOM Source Code License as*/
/* published by id Software. All rights reserved.*/

/* The source is distributed in the hope that it will be useful,*/
/* but WITHOUT ANY WARRANTY; without even the implied warranty of*/
/* FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License*/
/* for more details.*/

/* $Log:$*/

/* DESCRIPTION:*/
/*	Gamma correction LUT stuff.*/
/*	Functions to draw patches (by post) directly to screen.*/
/*	Functions to blit a block to the screen.*/

/*-----------------------------------------------------------------------------*/


static const char
rcsid[] = "$Id: v_video.c,v 1.5 1997/02/03 22:45:13 b1 Exp $";


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

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

#include "m_bbox.h"
#include "m_swap.h"

#include "v_video.h"
#include "i_video.h"


#ifdef __riscos__
#include "ROsupport.h"
#endif


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

#ifndef STATIC_RESOLUTION
int				SCREENWIDTH;
int				SCREENHEIGHT;
float				INV_ASPECT_RATIO;
#endif




/* 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}
};



int	usegamma;


/* 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 )
{
#ifndef DIYARMASS
    const pixel_t*	src;
    pixel_t*		dest;
#endif

#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)
    {
#ifdef RANGECHECK_ABORTS
	I_Error ("Bad V_CopyRect");
#else
	return;
#endif
    }
#endif
    V_MarkRect (destx, desty, width, height);

#ifdef DIYARMASS
    Varm_CopyRect(screens[srcscrn]+SCREENWIDTH*srcy+srcx, screens[destscrn]+SCREENWIDTH*desty+destx, width, height, SCREENWIDTH, SCREENWIDTH);
#else

    src = screens[srcscrn]+SCREENWIDTH*srcy+srcx;
    dest = screens[destscrn]+SCREENWIDTH*desty+destx;

    for ( ; height>0 ; height--)
    {
	memcpy (dest, src, width*sizeof(pixel_t));
	src += SCREENWIDTH;
	dest += SCREENWIDTH;
    }
#endif
}



/* V_DrawPatch*/
/* Masks a column based masked pic to the screen. */

void
V_DrawPatch
( int		x,
  int		y,
  int		scrn,
  const patch_t* patch )
{
#ifndef DIYARMASS
    int		count;
    int		col;
    const column_t* column;
    pixel_t*	desttop;
    pixel_t*	dest;
    const byte*	source;
    int		w;
#endif

    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)
    {
#ifdef RANGECHECK_ABORTS
	fprintf( logfile, "Patch at %d,%d exceeds LFB\n", x,y );
	/* No I_Error abort - what is up with TNT.WAD?*/
	fprintf( logfile, "V_DrawPatch: bad patch (ignored)\n");
	return;
#else
	return;
#endif
    }
#endif

    if (!scrn)
	V_MarkRect (x, y, SHORT(patch->width), SHORT(patch->height));

#ifdef DIYARMASS
    Varm_DrawPatch(&d_ctx, patch, screens[scrn] + y*SCREENWIDTH + x, 1);
#else
    col = 0;
    desttop = screens[scrn]+y*SCREENWIDTH+x;

    w = SHORT(patch->width);

    for ( ; col<w ; x++, col++, desttop++)
    {
	column = (const column_t *)((const byte *)patch + LONG(patch->columnofs[col]));

	/* step through the posts in a column */
	while (column->topdelta != 0xff )
	{
	    source = (const byte *)column + 3;
	    dest = desttop + column->topdelta*SCREENWIDTH;
	    count = column->length;

	    while (count--)
	    {
#if (LD_PIXEL_DEPTH == 3)
		*dest = *source++;
#else
                *dest = (pixel_t)d_ctx.static_colourmap[*source++];
#endif
		dest += SCREENWIDTH;
	    }
	    column = (const column_t *)( (const byte *)column + column->length + 4 );
	}
    }
#endif
}


/* 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,
  const patch_t* patch )
{
#ifndef DIYARMASS
    int		count;
    int		col;
    const column_t* column;
    pixel_t*	desttop;
    pixel_t*	dest;
    const byte*	source;
    int		w;
#endif

    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)
    {
#ifdef RANGECHECK_ABORTS
	fprintf( logfile, "Patch origin %d,%d exceeds LFB\n", x,y );
	/*I_Error ("Bad V_DrawPatch in V_DrawPatchFlipped");*/
	fprintf( logfile, "V_DrawPatchFlipped: bad patch (ignored)\n");
	return;
#else
	return;
#endif
    }
#endif

    if (!scrn)
	V_MarkRect (x, y, SHORT(patch->width), SHORT(patch->height));

#ifdef DIYARMASS
    Varm_DrawPatch(&d_ctx, patch, screens[scrn] + y*SCREENWIDTH + x, -1);
#else
    col = 0;
    desttop = screens[scrn]+y*SCREENWIDTH+x;

    w = SHORT(patch->width);

    for ( ; col<w ; x++, col++, desttop++)
    {
	column = (const column_t *)((const byte *)patch + LONG(patch->columnofs[w-1-col]));

	/* step through the posts in a column */
	while (column->topdelta != 0xff )
	{
	    source = (const byte *)column + 3;
	    dest = desttop + column->topdelta*SCREENWIDTH;
	    count = column->length;

	    while (count--)
	    {
#if (LD_PIXEL_DEPTH == 3)
		*dest = *source++;
#else
                *dest = (pixel_t)d_ctx.static_colourmap[*source++];
#endif
		dest += SCREENWIDTH;
	    }
	    column = (const column_t *)( (const byte *)column + column->length + 4 );
	}
    }
#endif
}




/* Rather than call a function from a function I defined it in v_video.h */
#ifndef DIYARMASS
/* V_DrawPatchDirect*/
/* Draws directly to the screen on the pc. */

void
V_DrawPatchDirect
( int		x,
  int		y,
  int		scrn,
  const 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)
    {
#ifdef RANGECHECK_ABORTS
	I_Error ("Bad V_DrawPatchDirect");
#else
	return;
#endif
    }
#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
    }*/
}
#endif




/* 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,
  const pixel_t* src )
{
#ifndef DIYARMASS
    pixel_t*	dest;
#endif

#ifdef RANGECHECK
    if (x<0
	||x+width >SCREENWIDTH
	|| y<0
	|| y+height>SCREENHEIGHT
	|| (unsigned)scrn>4 )
    {
#ifdef RANGECHECK_ABORTS
	I_Error ("Bad V_DrawBlock");
#else
	return;
#endif
    }
#endif

    V_MarkRect (x, y, width, height);

#ifdef DIYARMASS
    Varm_CopyRect(src, screens[scrn] + y*SCREENWIDTH + x, width, height, width, SCREENWIDTH);
#else
    dest = screens[scrn] + y*SCREENWIDTH+x;

    while (height--)
    {
	memcpy (dest, src, width*sizeof(pixel_t));
	src += width;
	dest += SCREENWIDTH;
    }
#endif
}




/* 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,
  pixel_t*	dest )
{
#ifndef DIYARMASS
    pixel_t*	src;
#endif

#ifdef RANGECHECK
    if (x<0
	||x+width >SCREENWIDTH
	|| y<0
	|| y+height>SCREENHEIGHT
	|| (unsigned)scrn>4 )
    {
#ifdef RANGECHECK_ABORTS
	I_Error ("Bad V_DrawBlock");
#else
	return;
#endif
    }
#endif

#ifdef DIYARMASS
    Varm_CopyRect(screens[scrn] + y*SCREENWIDTH + x, dest, width, height, SCREENWIDTH, width);
#else
    src = screens[scrn] + y*SCREENWIDTH+x;

    while (height--)
    {
	memcpy (dest, src, width*sizeof(pixel_t));
	src += SCREENWIDTH;
	dest += width;
    }
#endif
}





/* V_Init*/

void V_Init (void)
{
    int		i;
    pixel_t*	base;

    /* stick these in low dos memory on PCs*/
#ifdef __riscos__
    screen_desc	sd;
    int numfb;

    /* Use frame buffers as screens 2, 3 if possible (2 always possible) */
    ReadScreenInfo(&sd);

    base = (pixel_t*)I_AllocLow (SCREENWIDTH*SCREENHEIGHT*sizeof(pixel_t));
    for (i=0 ; i<4 ; i++)
        screens[i] = base;

    i = 1;
    numfb = sd.size / (sd.resx*sd.resy*sizeof(pixel_t));
    if (numfb < 3)
    {
        i = 2;
        screens[3] = (pixel_t*)I_AllocLow (SCREENWIDTH*SCREENHEIGHT*sizeof(pixel_t));
        if (numfb < 2)
        {
            i = 3;
            screens[2] = (pixel_t*)I_AllocLow(SCREENWIDTH*SCREENHEIGHT*sizeof(pixel_t));
        }
    }
#else
    base = (pixel_t*)I_AllocLow (SCREENWIDTH*SCREENHEIGHT*4*sizeof(pixel_t));

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

    printf("V_Init: Allocated %d screens.\n", i);

    /* Why doesn't anyone ever trap memory errors??? */
    if (base == NULL)
    {
	I_Error("V_Init: Not enough memory left to init screen buffers!");
    }
}
