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/* Emacs style mode select -*- C++ -*-
*-----------------------------------------------------------------------------
*
*
* PrBoom: a Doom port merged with LxDoom and LSDLDoom
* based on BOOM, a modified and improved DOOM engine
* Copyright (C) 1999 by
* id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
* Copyright (C) 1999-2000 by
* Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze
* Copyright 2005, 2006 by
* Florian Schulze, Colin Phipps, Neil Stevens, Andrey Budko
*
* 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.
*
*-----------------------------------------------------------------------------*/
#ifndef R_FILTER_H
#define R_FILTER_H
#define DITHER_DIM 4
extern byte filter_ditherMatrix[DITHER_DIM][DITHER_DIM];
#define FILTER_UVBITS 6
#define FILTER_UVDIM (1<<FILTER_UVBITS)
extern byte filter_roundedUVMap[FILTER_UVDIM*FILTER_UVDIM];
extern byte filter_roundedRowMap[4*16];
void R_FilterInit(void);
// Use the dither matrix to determine whether a pixel is on or off based
// on the overall intensity we're trying to simulate
#define filter_getDitheredPixelLevel(x, y, intensity) \
((filter_ditherMatrix[(y)&(DITHER_DIM-1)][(x)&(DITHER_DIM-1)] < (intensity)) ? 1 : 0)
// Choose current pixel or next pixel down based on dither of the fractional
// texture V coord. texV is not a true fractional texture coord, so it
// has to be converted using ((texV) - dcvars.yl) >> 8), which was empirically
// derived. the "-dcvars.yl" is apparently required to offset some minor
// shaking in coordinate y-axis and prevents dithering seams
#define FILTER_GETV(x,y,texV,nextRowTexV) \
(filter_getDitheredPixelLevel(x, y, (((texV) - yl) >> 8)&0xff) ? ((nextRowTexV)>>FRACBITS) : ((texV)>>FRACBITS))
// Choose current column or next column to the right based on dither of the
// fractional texture U coord
#define filter_getDitheredForColumn(x, y, texV, nextRowTexV) \
dither_sources[(filter_getDitheredPixelLevel(x, y, filter_fracu))][FILTER_GETV(x,y,texV,nextRowTexV)]
#define filter_getRoundedForColumn(texV, nextRowTexV) \
filter_getScale2xQuadColors( \
source[ ((texV)>>FRACBITS) ], \
source[ (MAX(0, ((texV)>>FRACBITS)-1)) ], \
nextsource[ ((texV)>>FRACBITS) ], \
source[ ((nextRowTexV)>>FRACBITS) ], \
prevsource[ ((texV)>>FRACBITS) ] \
) \
[ filter_roundedUVMap[ \
((filter_fracu>>(8-FILTER_UVBITS))<<FILTER_UVBITS) + \
((((texV)>>8) & 0xff)>>(8-FILTER_UVBITS)) \
] ]
#define filter_getRoundedForSpan(texU, texV) \
filter_getScale2xQuadColors( \
source[ (((texU)>>16)&0x3f) | (((texV)>>10)&0xfc0) ], \
source[ (((texU)>>16)&0x3f) | ((((texV)-FRACUNIT)>>10)&0xfc0) ], \
source[ ((((texU)+FRACUNIT)>>16)&0x3f) | (((texV)>>10)&0xfc0) ], \
source[ (((texU)>>16)&0x3f) | ((((texV)+FRACUNIT)>>10)&0xfc0) ], \
source[ ((((texU)-FRACUNIT)>>16)&0x3f) | (((texV)>>10)&0xfc0) ] \
) \
[ filter_roundedUVMap[ \
(((((texU)>>8) & 0xff)>>(8-FILTER_UVBITS))<<FILTER_UVBITS) + \
((((texV)>>8) & 0xff)>>(8-FILTER_UVBITS)) \
] ]
byte *filter_getScale2xQuadColors(byte e, byte b, byte f, byte h, byte d);
// This is the horrendous macro version of the function commented out of
// r_filter.c. It does a bilinear blend on the four source texels for a
// given u and v
#define filter_getFilteredForColumn32(depthmap, texV, nextRowTexV) ( \
VID_PAL32( depthmap(nextsource[(nextRowTexV)>>FRACBITS]), (filter_fracu*((texV)&0xffff))>>(32-VID_COLORWEIGHTBITS) ) + \
VID_PAL32( depthmap(source[(nextRowTexV)>>FRACBITS]), ((0xffff-filter_fracu)*((texV)&0xffff))>>(32-VID_COLORWEIGHTBITS) ) + \
VID_PAL32( depthmap(source[(texV)>>FRACBITS]), ((0xffff-filter_fracu)*(0xffff-((texV)&0xffff)))>>(32-VID_COLORWEIGHTBITS) ) + \
VID_PAL32( depthmap(nextsource[(texV)>>FRACBITS]), (filter_fracu*(0xffff-((texV)&0xffff)))>>(32-VID_COLORWEIGHTBITS) ))
// The 16 bit method of the filtering doesn't really maintain enough
// accuracy for discerning viewers, but the alternative requires converting
// from 32 bit, which is slow and requires both the intPalette and the
// shortPalette to be in memory at the same time.
#define filter_getFilteredForColumn16(depthmap, texV, nextRowTexV) ( \
VID_PAL16( depthmap(nextsource[(nextRowTexV)>>FRACBITS]), (filter_fracu*((texV)&0xffff))>>(32-VID_COLORWEIGHTBITS) ) + \
VID_PAL16( depthmap(source[(nextRowTexV)>>FRACBITS]), ((0xffff-filter_fracu)*((texV)&0xffff))>>(32-VID_COLORWEIGHTBITS) ) + \
VID_PAL16( depthmap(source[(texV)>>FRACBITS]), ((0xffff-filter_fracu)*(0xffff-((texV)&0xffff)))>>(32-VID_COLORWEIGHTBITS) ) + \
VID_PAL16( depthmap(nextsource[(texV)>>FRACBITS]), (filter_fracu*(0xffff-((texV)&0xffff)))>>(32-VID_COLORWEIGHTBITS) ))
#define filter_getFilteredForColumn15(depthmap, texV, nextRowTexV) ( \
VID_PAL15( depthmap(nextsource[(nextRowTexV)>>FRACBITS]), (filter_fracu*((texV)&0xffff))>>(32-VID_COLORWEIGHTBITS) ) + \
VID_PAL15( depthmap(source[(nextRowTexV)>>FRACBITS]), ((0xffff-filter_fracu)*((texV)&0xffff))>>(32-VID_COLORWEIGHTBITS) ) + \
VID_PAL15( depthmap(source[(texV)>>FRACBITS]), ((0xffff-filter_fracu)*(0xffff-((texV)&0xffff)))>>(32-VID_COLORWEIGHTBITS) ) + \
VID_PAL15( depthmap(nextsource[(texV)>>FRACBITS]), (filter_fracu*(0xffff-((texV)&0xffff)))>>(32-VID_COLORWEIGHTBITS) ))
// Same as for column but wrapping at 64
#define filter_getFilteredForSpan32(depthmap, texU, texV) ( \
VID_PAL32( depthmap(source[ ((((texU)+FRACUNIT)>>16)&0x3f) | ((((texV)+FRACUNIT)>>10)&0xfc0)]), (unsigned int)(((texU)&0xffff)*((texV)&0xffff))>>(32-VID_COLORWEIGHTBITS)) + \
VID_PAL32( depthmap(source[ (((texU)>>16)&0x3f) | ((((texV)+FRACUNIT)>>10)&0xfc0)]), (unsigned int)((0xffff-((texU)&0xffff))*((texV)&0xffff))>>(32-VID_COLORWEIGHTBITS)) + \
VID_PAL32( depthmap(source[ (((texU)>>16)&0x3f) | (((texV)>>10)&0xfc0)]), (unsigned int)((0xffff-((texU)&0xffff))*(0xffff-((texV)&0xffff)))>>(32-VID_COLORWEIGHTBITS)) + \
VID_PAL32( depthmap(source[ ((((texU)+FRACUNIT)>>16)&0x3f) | (((texV)>>10)&0xfc0)]), (unsigned int)(((texU)&0xffff)*(0xffff-((texV)&0xffff)))>>(32-VID_COLORWEIGHTBITS)))
// Use 16 bit addition here since it's a little faster and the defects from
// such low-accuracy blending are less visible on spans
#define filter_getFilteredForSpan16(depthmap, texU, texV) ( \
VID_PAL16( depthmap(source[ ((((texU)+FRACUNIT)>>16)&0x3f) | ((((texV)+FRACUNIT)>>10)&0xfc0)]), (unsigned int)(((texU)&0xffff)*((texV)&0xffff))>>(32-VID_COLORWEIGHTBITS)) + \
VID_PAL16( depthmap(source[ (((texU)>>16)&0x3f) | ((((texV)+FRACUNIT)>>10)&0xfc0)]), (unsigned int)((0xffff-((texU)&0xffff))*((texV)&0xffff))>>(32-VID_COLORWEIGHTBITS)) + \
VID_PAL16( depthmap(source[ (((texU)>>16)&0x3f) | (((texV)>>10)&0xfc0)]), (unsigned int)((0xffff-((texU)&0xffff))*(0xffff-((texV)&0xffff)))>>(32-VID_COLORWEIGHTBITS)) + \
VID_PAL16( depthmap(source[ ((((texU)+FRACUNIT)>>16)&0x3f) | (((texV)>>10)&0xfc0)]), (unsigned int)(((texU)&0xffff)*(0xffff-((texV)&0xffff)))>>(32-VID_COLORWEIGHTBITS)))
#define filter_getFilteredForSpan15(depthmap, texU, texV) ( \
VID_PAL15( depthmap(source[ ((((texU)+FRACUNIT)>>16)&0x3f) | ((((texV)+FRACUNIT)>>10)&0xfc0)]), (unsigned int)(((texU)&0xffff)*((texV)&0xffff))>>(32-VID_COLORWEIGHTBITS)) + \
VID_PAL15( depthmap(source[ (((texU)>>16)&0x3f) | ((((texV)+FRACUNIT)>>10)&0xfc0)]), (unsigned int)((0xffff-((texU)&0xffff))*((texV)&0xffff))>>(32-VID_COLORWEIGHTBITS)) + \
VID_PAL15( depthmap(source[ (((texU)>>16)&0x3f) | (((texV)>>10)&0xfc0)]), (unsigned int)((0xffff-((texU)&0xffff))*(0xffff-((texV)&0xffff)))>>(32-VID_COLORWEIGHTBITS)) + \
VID_PAL15( depthmap(source[ ((((texU)+FRACUNIT)>>16)&0x3f) | (((texV)>>10)&0xfc0)]), (unsigned int)(((texU)&0xffff)*(0xffff-((texV)&0xffff)))>>(32-VID_COLORWEIGHTBITS)))
// do red and blue at once for slight speedup
#define GETBLENDED15_5050(col1, col2) \
((((col1&0x7c1f)+(col2&0x7c1f))>>1)&0x7c1f) | \
((((col1&0x03e0)+(col2&0x03e0))>>1)&0x03e0)
#define GETBLENDED16_5050(col1, col2) \
((((col1&0xf81f)+(col2&0xf81f))>>1)&0xf81f) | \
((((col1&0x07e0)+(col2&0x07e0))>>1)&0x07e0)
#define GETBLENDED32_5050(col1, col2) \
((((col1&0xff00ff)+(col2&0xff00ff))>>1)&0xff00ff) | \
((((col1&0x00ff00)+(col2&0x00ff00))>>1)&0x00ff00)
#define GETBLENDED15_3268(col1, col2) \
((((col1&0x7c1f)*5+(col2&0x7c1f)*11)>>4)&0x7c1f) | \
((((col1&0x03e0)*5+(col2&0x03e0)*11)>>4)&0x03e0)
#define GETBLENDED16_3268(col1, col2) \
((((col1&0xf81f)*5+(col2&0xf81f)*11)>>4)&0xf81f) | \
((((col1&0x07e0)*5+(col2&0x07e0)*11)>>4)&0x07e0)
#define GETBLENDED32_3268(col1, col2) \
((((col1&0xff00ff)*5+(col2&0xff00ff)*11)>>4)&0xff00ff) | \
((((col1&0x00ff00)*5+(col2&0x00ff00)*11)>>4)&0x00ff00)
#define GETBLENDED15_9406(col1, col2) \
((((col1&0x7c1f)*15+(col2&0x7c1f))>>4)&0x7c1f) | \
((((col1&0x03e0)*15+(col2&0x03e0))>>4)&0x03e0)
#define GETBLENDED16_9406(col1, col2) \
((((col1&0xf81f)*15+(col2&0xf81f))>>4)&0xf81f) | \
((((col1&0x07e0)*15+(col2&0x07e0))>>4)&0x07e0)
#define GETBLENDED32_9406(col1, col2) \
((((col1&0xff00ff)*15+(col2&0xff00ff))>>4)&0xff00ff) | \
((((col1&0x00ff00)*15+(col2&0x00ff00))>>4)&0x00ff00)
#endif
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