/*
===========================================================================

Doom 3 BFG Edition GPL Source Code
Copyright (C) 1993-2012 id Software LLC, a ZeniMax Media company. 

This file is part of the Doom 3 BFG Edition GPL Source Code ("Doom 3 BFG Edition Source Code").  

Doom 3 BFG Edition Source Code 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 3 of the License, or
(at your option) any later version.

Doom 3 BFG Edition Source Code 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 Doom 3 BFG Edition Source Code.  If not, see <http://www.gnu.org/licenses/>.

In addition, the Doom 3 BFG Edition Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 BFG Edition Source Code.  If not, please request a copy in writing from id Software at the address below.

If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.

===========================================================================
*/

#include "Precompiled.h"
#include "globaldata.h"


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

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

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

#include "v_video.h"


// Each screen is [ORIGINAL_WIDTH*ORIGINALHEIGHT]; 
 



// 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}
};



			 
//
// V_MarkRect 
// 
void
V_MarkRect
( int		x,
  int		y,
  int		width,
  int		height ) 
{ 
    M_AddToBox (::g->dirtybox, x, y); 
    M_AddToBox (::g->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,
  bool      aspect) 
{ 
    byte*	src;
    byte*	dest; 
	 
#ifdef RANGECHECK 
    if (srcx<0
	||srcx+width > (aspect ? ORIGINAL_WIDTH * 2 : ORIGINAL_WIDTH)
	|| srcy<0
	|| srcy+height>ORIGINAL_HEIGHT 
	||destx<0||destx+width >(aspect ? ORIGINAL_WIDTH * 2 : ORIGINAL_WIDTH)
	|| desty<0
	|| desty+height>ORIGINAL_HEIGHT
	|| (unsigned)srcscrn>4
	|| (unsigned)destscrn>4)
    {
	I_Error ("Bad V_CopyRect");
    }
#endif 
    V_MarkRect (destx, desty, width, height); 

	// SMF - rewritten for scaling
	srcx *= (aspect ? GLOBAL_IMAGE_SCALER : ::g->ASPECT_IMAGE_SCALER); //GK: For x-axis use the aspect image scaler and not the global
	srcy *= GLOBAL_IMAGE_SCALER;
	destx *= (aspect ? GLOBAL_IMAGE_SCALER : ::g->ASPECT_IMAGE_SCALER);
	desty *= GLOBAL_IMAGE_SCALER;
	width *= (aspect ? GLOBAL_IMAGE_SCALER : ::g->ASPECT_IMAGE_SCALER);
	height *= GLOBAL_IMAGE_SCALER;

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

	for ( ; height>0 ; height--) { 
		memcpy(dest, src, width); 
		src += ::g->SCREENWIDTH;
		dest += ::g->SCREENWIDTH;
	} 
} 
 
//
// V_DrawPatch
// Masks a column based masked pic to the screen. 
//
void
V_DrawPatch
( int		x,
  int		y,
  int		scrn,
  patch_t*	patch,
  bool      aspect,
  int       xLeadingOffs,
  int       xEndingOffs) 
{ 

    int				count;
    int				col; 
    postColumn_t*	column; 
    byte*			source; 
    int				w; 
	 
    y -= SHORT(patch->topoffset); 
    x -= SHORT(patch->leftoffset); 
#ifdef RANGECHECK 
    if (x<0
	||x+SHORT(patch->width) >(aspect ? ORIGINAL_WIDTH * 2 : ORIGINAL_WIDTH)
	|| y<0
	|| y+SHORT(patch->height)>ORIGINAL_HEIGHT
	|| (unsigned)scrn>4)
    {
      I_PrintfE("Patch at %d,%d exceeds LFB\n", x,y );
      // No I_Error abort - what is up with TNT.WAD?
      I_PrintfE("V_DrawPatch: bad patch (ignored)\n");
      return;
    }
#endif 

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

    col = xLeadingOffs; 
	int destx = x;
	int desty = y;
	 
    w = SHORT(patch->width) - xEndingOffs;

	// SMF - rewritten for scaling
	for ( ; col < w ; x++, col++ ) {
		column = (postColumn_t *)((byte *)patch + LONG(patch->columnofs[col]));

		destx = x * (aspect ? GLOBAL_IMAGE_SCALER : 1);

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

			while (count--) {
				int scaledx, scaledy;
				scaledx = destx * (aspect ? 1 : ::g->ASPECT_IMAGE_SCALER);
				scaledy = desty * GLOBAL_IMAGE_SCALER;
				byte src = *source++;

				for ( int i = 0; i < GLOBAL_IMAGE_SCALER; i++ ) {
					for ( int j = 0; j < ::g->ASPECT_IMAGE_SCALER; j++ ) {
						::g->screens[scrn][( scaledx + j ) + ( scaledy + i ) * ::g->SCREENWIDTH] = src;
					}
				}

				desty++;
			}

			column = (postColumn_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; 
    postColumn_t*	column; 
    byte*			source; 
    int				w; 
	 
    y -= SHORT(patch->topoffset); 
    x -= SHORT(patch->leftoffset); 
#ifdef RANGECHECK 
    if (x<0
	||x+SHORT(patch->width) >ORIGINAL_WIDTH
	|| y<0
	|| y+SHORT(patch->height)>ORIGINAL_HEIGHT
	|| (unsigned)scrn>4)
    {
      I_PrintfE("Patch origin %d,%d exceeds LFB\n", x,y );
      I_Error ("Bad V_DrawPatch in V_DrawPatchFlipped");
    }
#endif 
 
    if (!scrn)
	V_MarkRect (x, y, SHORT(patch->width), SHORT(patch->height)); 

    col = 0; 
	int destx = x;
	int desty = y;

    w = SHORT(patch->width); 

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

		destx = x;
	 
		// step through the posts in a column 
		while (column->topdelta != 0xff ) 
		{ 
			source = (byte *)column + 3; 
			desty = y + column->topdelta;
			count = column->length; 
				 
			while (count--) 
			{
				int scaledx, scaledy;
				scaledx = destx * ::g->ASPECT_IMAGE_SCALER;
				scaledy = desty * GLOBAL_IMAGE_SCALER;
				byte src = *source++;

				for ( int i = 0; i < GLOBAL_IMAGE_SCALER; i++ ) {
					for ( int j = 0; j < ::g->ASPECT_IMAGE_SCALER; j++ ) {
						::g->screens[scrn][( scaledx + j ) + ( scaledy + i ) * ::g->SCREENWIDTH] = src;
					}
				}

				desty++;
			} 
			column = (postColumn_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,
  bool  aspect) 
{
    V_DrawPatch (x,y,scrn, patch, aspect); 

    /*
    int		count;
    int		col; 
    postColumn_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) >ORIGINAL_WIDTH
	|| y<0
	|| y+SHORT(patch->height)>ORIGINAL_HEIGHT
	|| (unsigned)scrn>4)
    {
	I_Error ("Bad V_DrawPatchDirect");
    }
#endif 
 
    //	V_MarkRect (x, y, SHORT(patch->width), SHORT(patch->height)); 
    desttop = destscreen + y*ORIGINAL_WIDTH/4 + (x>>2); 
	 
    w = SHORT(patch->width); 
    for ( col = 0 ; col<w ; col++) 
    { 
	outp (SC_INDEX+1,1<<(x&3)); 
	column = (postColumn_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*ORIGINAL_WIDTH/4; 
	    count = column->length; 
 
	    while (count--) 
	    { 
		*dest = *source++; 
		dest += ORIGINAL_WIDTH/4; 
	    } 
	    column = (postColumn_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 >::g->SCREENWIDTH
	|| y<0
	|| y+height>SCREENHEIGHT
	|| (unsigned)scrn>4 )
    {
	I_Error ("Bad V_DrawBlock");
    }
#endif 
 
    V_MarkRect (x, y, width, height); 
 
    dest = ::g->screens[scrn] + y* ::g->SCREENWIDTH+x;

    while (height--) 
    { 
	memcpy(dest, src, width); 
	src += width; 
	dest += ::g->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 >::g->SCREENWIDTH
	|| y<0
	|| y+height>SCREENHEIGHT
	|| (unsigned)scrn>4 )
    {
	I_Error ("Bad V_DrawBlock");
    }
#endif 
 
    src = ::g->screens[scrn] + y* ::g->SCREENWIDTH+x;

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




//
// V_Init
// 
void V_Init (void) 
{ 
    int		i;
    byte*	base;

    // stick these in low dos memory on PCs

    base = (byte*)DoomLib::Z_Malloc(::g->SCREENWIDTH*SCREENHEIGHT*4, PU_STATIC, 0);

    for (i=0 ; i<4 ; i++)
		::g->screens[i] = base + i* ::g->SCREENWIDTH*SCREENHEIGHT;
}

