/* 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<> 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))<>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))<>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