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Diffstat (limited to 'src/r_draw.c')
| -rw-r--r-- | src/r_draw.c | 880 |
1 files changed, 880 insertions, 0 deletions
diff --git a/src/r_draw.c b/src/r_draw.c new file mode 100644 index 00000000..64e5ed6a --- /dev/null +++ b/src/r_draw.c @@ -0,0 +1,880 @@ +// Emacs style mode select -*- C++ -*- +//----------------------------------------------------------------------------- +// +// $Id: r_draw.c 4 2005-07-23 16:19:41Z fraggle $ +// +// 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. +// +// $Log$ +// Revision 1.1 2005/07/23 16:19:49 fraggle +// Initial revision +// +// +// DESCRIPTION: +// The actual span/column drawing functions. +// Here find the main potential for optimization, +// e.g. inline assembly, different algorithms. +// +//----------------------------------------------------------------------------- + + +static const char +rcsid[] = "$Id: r_draw.c 4 2005-07-23 16:19:41Z fraggle $"; + + +#include "doomdef.h" + +#include "i_system.h" +#include "z_zone.h" +#include "w_wad.h" + +#include "r_local.h" + +// Needs access to LFB (guess what). +#include "v_video.h" + +// State. +#include "doomstat.h" + + +// ? +#define MAXWIDTH 1120 +#define MAXHEIGHT 832 + +// status bar height at bottom of screen +#define SBARHEIGHT 32 + +// +// All drawing to the view buffer is accomplished in this file. +// The other refresh files only know about ccordinates, +// not the architecture of the frame buffer. +// Conveniently, the frame buffer is a linear one, +// and we need only the base address, +// and the total size == width*height*depth/8., +// + + +byte* viewimage; +int viewwidth; +int scaledviewwidth; +int viewheight; +int viewwindowx; +int viewwindowy; +byte* ylookup[MAXHEIGHT]; +int columnofs[MAXWIDTH]; + +// Color tables for different players, +// translate a limited part to another +// (color ramps used for suit colors). +// +byte translations[3][256]; + + + + +// +// R_DrawColumn +// Source is the top of the column to scale. +// +lighttable_t* dc_colormap; +int dc_x; +int dc_yl; +int dc_yh; +fixed_t dc_iscale; +fixed_t dc_texturemid; + +// first pixel in a column (possibly virtual) +byte* dc_source; + +// just for profiling +int dccount; + +// +// A column is a vertical slice/span from a wall texture that, +// given the DOOM style restrictions on the view orientation, +// will always have constant z depth. +// Thus a special case loop for very fast rendering can +// be used. It has also been used with Wolfenstein 3D. +// +void R_DrawColumn (void) +{ + int count; + byte* dest; + fixed_t frac; + fixed_t fracstep; + + count = dc_yh - dc_yl; + + // Zero length, column does not exceed a pixel. + if (count < 0) + return; + +#ifdef RANGECHECK + if ((unsigned)dc_x >= SCREENWIDTH + || dc_yl < 0 + || dc_yh >= SCREENHEIGHT) + I_Error ("R_DrawColumn: %i to %i at %i", dc_yl, dc_yh, dc_x); +#endif + + // Framebuffer destination address. + // Use ylookup LUT to avoid multiply with ScreenWidth. + // Use columnofs LUT for subwindows? + dest = ylookup[dc_yl] + columnofs[dc_x]; + + // Determine scaling, + // which is the only mapping to be done. + fracstep = dc_iscale; + frac = dc_texturemid + (dc_yl-centery)*fracstep; + + // Inner loop that does the actual texture mapping, + // e.g. a DDA-lile scaling. + // This is as fast as it gets. + do + { + // Re-map color indices from wall texture column + // using a lighting/special effects LUT. + *dest = dc_colormap[dc_source[(frac>>FRACBITS)&127]]; + + dest += SCREENWIDTH; + frac += fracstep; + + } while (count--); +} + + + +// UNUSED. +// Loop unrolled. +#if 0 +void R_DrawColumn (void) +{ + int count; + byte* source; + byte* dest; + byte* colormap; + + unsigned frac; + unsigned fracstep; + unsigned fracstep2; + unsigned fracstep3; + unsigned fracstep4; + + count = dc_yh - dc_yl + 1; + + source = dc_source; + colormap = dc_colormap; + dest = ylookup[dc_yl] + columnofs[dc_x]; + + fracstep = dc_iscale<<9; + frac = (dc_texturemid + (dc_yl-centery)*dc_iscale)<<9; + + fracstep2 = fracstep+fracstep; + fracstep3 = fracstep2+fracstep; + fracstep4 = fracstep3+fracstep; + + while (count >= 8) + { + dest[0] = colormap[source[frac>>25]]; + dest[SCREENWIDTH] = colormap[source[(frac+fracstep)>>25]]; + dest[SCREENWIDTH*2] = colormap[source[(frac+fracstep2)>>25]]; + dest[SCREENWIDTH*3] = colormap[source[(frac+fracstep3)>>25]]; + + frac += fracstep4; + + dest[SCREENWIDTH*4] = colormap[source[frac>>25]]; + dest[SCREENWIDTH*5] = colormap[source[(frac+fracstep)>>25]]; + dest[SCREENWIDTH*6] = colormap[source[(frac+fracstep2)>>25]]; + dest[SCREENWIDTH*7] = colormap[source[(frac+fracstep3)>>25]]; + + frac += fracstep4; + dest += SCREENWIDTH*8; + count -= 8; + } + + while (count > 0) + { + *dest = colormap[source[frac>>25]]; + dest += SCREENWIDTH; + frac += fracstep; + count--; + } +} +#endif + + +void R_DrawColumnLow (void) +{ + int count; + byte* dest; + byte* dest2; + fixed_t frac; + fixed_t fracstep; + + count = dc_yh - dc_yl; + + // Zero length. + if (count < 0) + return; + +#ifdef RANGECHECK + if ((unsigned)dc_x >= SCREENWIDTH + || dc_yl < 0 + || dc_yh >= SCREENHEIGHT) + { + + I_Error ("R_DrawColumn: %i to %i at %i", dc_yl, dc_yh, dc_x); + } + // dccount++; +#endif + // Blocky mode, need to multiply by 2. + dc_x <<= 1; + + dest = ylookup[dc_yl] + columnofs[dc_x]; + dest2 = ylookup[dc_yl] + columnofs[dc_x+1]; + + fracstep = dc_iscale; + frac = dc_texturemid + (dc_yl-centery)*fracstep; + + do + { + // Hack. Does not work corretly. + *dest2 = *dest = dc_colormap[dc_source[(frac>>FRACBITS)&127]]; + dest += SCREENWIDTH; + dest2 += SCREENWIDTH; + frac += fracstep; + + } while (count--); +} + + +// +// Spectre/Invisibility. +// +#define FUZZTABLE 50 +#define FUZZOFF (SCREENWIDTH) + + +int fuzzoffset[FUZZTABLE] = +{ + FUZZOFF,-FUZZOFF,FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF, + FUZZOFF,FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF, + FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF,-FUZZOFF,-FUZZOFF,-FUZZOFF, + FUZZOFF,-FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF, + FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF,-FUZZOFF,FUZZOFF, + FUZZOFF,-FUZZOFF,-FUZZOFF,-FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF, + FUZZOFF,FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF,FUZZOFF +}; + +int fuzzpos = 0; + + +// +// Framebuffer postprocessing. +// Creates a fuzzy image by copying pixels +// from adjacent ones to left and right. +// Used with an all black colormap, this +// could create the SHADOW effect, +// i.e. spectres and invisible players. +// +void R_DrawFuzzColumn (void) +{ + int count; + byte* dest; + fixed_t frac; + fixed_t fracstep; + + // Adjust borders. Low... + if (!dc_yl) + dc_yl = 1; + + // .. and high. + if (dc_yh == viewheight-1) + dc_yh = viewheight - 2; + + count = dc_yh - dc_yl; + + // Zero length. + if (count < 0) + return; + + +#ifdef RANGECHECK + if ((unsigned)dc_x >= SCREENWIDTH + || dc_yl < 0 || dc_yh >= SCREENHEIGHT) + { + I_Error ("R_DrawFuzzColumn: %i to %i at %i", + dc_yl, dc_yh, dc_x); + } +#endif + + + // Keep till detailshift bug in blocky mode fixed, + // or blocky mode removed. + /* WATCOM code + if (detailshift) + { + if (dc_x & 1) + { + outpw (GC_INDEX,GC_READMAP+(2<<8) ); + outp (SC_INDEX+1,12); + } + else + { + outpw (GC_INDEX,GC_READMAP); + outp (SC_INDEX+1,3); + } + dest = destview + dc_yl*80 + (dc_x>>1); + } + else + { + outpw (GC_INDEX,GC_READMAP+((dc_x&3)<<8) ); + outp (SC_INDEX+1,1<<(dc_x&3)); + dest = destview + dc_yl*80 + (dc_x>>2); + }*/ + + + // Does not work with blocky mode. + dest = ylookup[dc_yl] + columnofs[dc_x]; + + // Looks familiar. + fracstep = dc_iscale; + frac = dc_texturemid + (dc_yl-centery)*fracstep; + + // Looks like an attempt at dithering, + // using the colormap #6 (of 0-31, a bit + // brighter than average). + do + { + // Lookup framebuffer, and retrieve + // a pixel that is either one column + // left or right of the current one. + // Add index from colormap to index. + *dest = colormaps[6*256+dest[fuzzoffset[fuzzpos]]]; + + // Clamp table lookup index. + if (++fuzzpos == FUZZTABLE) + fuzzpos = 0; + + dest += SCREENWIDTH; + + frac += fracstep; + } while (count--); +} + + + + +// +// R_DrawTranslatedColumn +// Used to draw player sprites +// with the green colorramp mapped to others. +// Could be used with different translation +// tables, e.g. the lighter colored version +// of the BaronOfHell, the HellKnight, uses +// identical sprites, kinda brightened up. +// +byte* dc_translation; +byte* translationtables; + +void R_DrawTranslatedColumn (void) +{ + int count; + byte* dest; + fixed_t frac; + fixed_t fracstep; + + count = dc_yh - dc_yl; + if (count < 0) + return; + +#ifdef RANGECHECK + if ((unsigned)dc_x >= SCREENWIDTH + || dc_yl < 0 + || dc_yh >= SCREENHEIGHT) + { + I_Error ( "R_DrawColumn: %i to %i at %i", + dc_yl, dc_yh, dc_x); + } + +#endif + + + // WATCOM VGA specific. + /* Keep for fixing. + if (detailshift) + { + if (dc_x & 1) + outp (SC_INDEX+1,12); + else + outp (SC_INDEX+1,3); + + dest = destview + dc_yl*80 + (dc_x>>1); + } + else + { + outp (SC_INDEX+1,1<<(dc_x&3)); + + dest = destview + dc_yl*80 + (dc_x>>2); + }*/ + + + // FIXME. As above. + dest = ylookup[dc_yl] + columnofs[dc_x]; + + // Looks familiar. + fracstep = dc_iscale; + frac = dc_texturemid + (dc_yl-centery)*fracstep; + + // Here we do an additional index re-mapping. + do + { + // Translation tables are used + // to map certain colorramps to other ones, + // used with PLAY sprites. + // Thus the "green" ramp of the player 0 sprite + // is mapped to gray, red, black/indigo. + *dest = dc_colormap[dc_translation[dc_source[frac>>FRACBITS]]]; + dest += SCREENWIDTH; + + frac += fracstep; + } while (count--); +} + + + + +// +// R_InitTranslationTables +// Creates the translation tables to map +// the green color ramp to gray, brown, red. +// Assumes a given structure of the PLAYPAL. +// Could be read from a lump instead. +// +void R_InitTranslationTables (void) +{ + int i; + + translationtables = Z_Malloc (256*3+255, PU_STATIC, 0); + translationtables = (byte *)(( (int)translationtables + 255 )& ~255); + + // translate just the 16 green colors + for (i=0 ; i<256 ; i++) + { + if (i >= 0x70 && i<= 0x7f) + { + // map green ramp to gray, brown, red + translationtables[i] = 0x60 + (i&0xf); + translationtables [i+256] = 0x40 + (i&0xf); + translationtables [i+512] = 0x20 + (i&0xf); + } + else + { + // Keep all other colors as is. + translationtables[i] = translationtables[i+256] + = translationtables[i+512] = i; + } + } +} + + + + +// +// R_DrawSpan +// With DOOM style restrictions on view orientation, +// the floors and ceilings consist of horizontal slices +// or spans with constant z depth. +// However, rotation around the world z axis is possible, +// thus this mapping, while simpler and faster than +// perspective correct texture mapping, has to traverse +// the texture at an angle in all but a few cases. +// In consequence, flats are not stored by column (like walls), +// and the inner loop has to step in texture space u and v. +// +int ds_y; +int ds_x1; +int ds_x2; + +lighttable_t* ds_colormap; + +fixed_t ds_xfrac; +fixed_t ds_yfrac; +fixed_t ds_xstep; +fixed_t ds_ystep; + +// start of a 64*64 tile image +byte* ds_source; + +// just for profiling +int dscount; + + +// +// Draws the actual span. +void R_DrawSpan (void) +{ + fixed_t xfrac; + fixed_t yfrac; + byte* dest; + int count; + int spot; + +#ifdef RANGECHECK + if (ds_x2 < ds_x1 + || ds_x1<0 + || ds_x2>=SCREENWIDTH + || (unsigned)ds_y>SCREENHEIGHT) + { + I_Error( "R_DrawSpan: %i to %i at %i", + ds_x1,ds_x2,ds_y); + } +// dscount++; +#endif + + + xfrac = ds_xfrac; + yfrac = ds_yfrac; + + dest = ylookup[ds_y] + columnofs[ds_x1]; + + // We do not check for zero spans here? + count = ds_x2 - ds_x1; + + do + { + // Current texture index in u,v. + spot = ((yfrac>>(16-6))&(63*64)) + ((xfrac>>16)&63); + + // Lookup pixel from flat texture tile, + // re-index using light/colormap. + *dest++ = ds_colormap[ds_source[spot]]; + + // Next step in u,v. + xfrac += ds_xstep; + yfrac += ds_ystep; + + } while (count--); +} + + + +// UNUSED. +// Loop unrolled by 4. +#if 0 +void R_DrawSpan (void) +{ + unsigned position, step; + + byte* source; + byte* colormap; + byte* dest; + + unsigned count; + usingned spot; + unsigned value; + unsigned temp; + unsigned xtemp; + unsigned ytemp; + + position = ((ds_xfrac<<10)&0xffff0000) | ((ds_yfrac>>6)&0xffff); + step = ((ds_xstep<<10)&0xffff0000) | ((ds_ystep>>6)&0xffff); + + source = ds_source; + colormap = ds_colormap; + dest = ylookup[ds_y] + columnofs[ds_x1]; + count = ds_x2 - ds_x1 + 1; + + while (count >= 4) + { + ytemp = position>>4; + ytemp = ytemp & 4032; + xtemp = position>>26; + spot = xtemp | ytemp; + position += step; + dest[0] = colormap[source[spot]]; + + ytemp = position>>4; + ytemp = ytemp & 4032; + xtemp = position>>26; + spot = xtemp | ytemp; + position += step; + dest[1] = colormap[source[spot]]; + + ytemp = position>>4; + ytemp = ytemp & 4032; + xtemp = position>>26; + spot = xtemp | ytemp; + position += step; + dest[2] = colormap[source[spot]]; + + ytemp = position>>4; + ytemp = ytemp & 4032; + xtemp = position>>26; + spot = xtemp | ytemp; + position += step; + dest[3] = colormap[source[spot]]; + + count -= 4; + dest += 4; + } + while (count > 0) + { + ytemp = position>>4; + ytemp = ytemp & 4032; + xtemp = position>>26; + spot = xtemp | ytemp; + position += step; + *dest++ = colormap[source[spot]]; + count--; + } +} +#endif + + +// +// Again.. +// +void R_DrawSpanLow (void) +{ + fixed_t xfrac; + fixed_t yfrac; + byte* dest; + int count; + int spot; + +#ifdef RANGECHECK + if (ds_x2 < ds_x1 + || ds_x1<0 + || ds_x2>=SCREENWIDTH + || (unsigned)ds_y>SCREENHEIGHT) + { + I_Error( "R_DrawSpan: %i to %i at %i", + ds_x1,ds_x2,ds_y); + } +// dscount++; +#endif + + xfrac = ds_xfrac; + yfrac = ds_yfrac; + + // Blocky mode, need to multiply by 2. + ds_x1 <<= 1; + ds_x2 <<= 1; + + dest = ylookup[ds_y] + columnofs[ds_x1]; + + + count = ds_x2 - ds_x1; + do + { + spot = ((yfrac>>(16-6))&(63*64)) + ((xfrac>>16)&63); + // Lowres/blocky mode does it twice, + // while scale is adjusted appropriately. + *dest++ = ds_colormap[ds_source[spot]]; + *dest++ = ds_colormap[ds_source[spot]]; + + xfrac += ds_xstep; + yfrac += ds_ystep; + + } while (count--); +} + +// +// R_InitBuffer +// Creats lookup tables that avoid +// multiplies and other hazzles +// for getting the framebuffer address +// of a pixel to draw. +// +void +R_InitBuffer +( int width, + int height ) +{ + int i; + + // Handle resize, + // e.g. smaller view windows + // with border and/or status bar. + viewwindowx = (SCREENWIDTH-width) >> 1; + + // Column offset. For windows. + for (i=0 ; i<width ; i++) + columnofs[i] = viewwindowx + i; + + // Samw with base row offset. + if (width == SCREENWIDTH) + viewwindowy = 0; + else + viewwindowy = (SCREENHEIGHT-SBARHEIGHT-height) >> 1; + + // Preclaculate all row offsets. + for (i=0 ; i<height ; i++) + ylookup[i] = screens[0] + (i+viewwindowy)*SCREENWIDTH; +} + + + + +// +// R_FillBackScreen +// Fills the back screen with a pattern +// for variable screen sizes +// Also draws a beveled edge. +// +void R_FillBackScreen (void) +{ + byte* src; + byte* dest; + int x; + int y; + patch_t* patch; + + // DOOM border patch. + char name1[] = "FLOOR7_2"; + + // DOOM II border patch. + char name2[] = "GRNROCK"; + + char* name; + + if (scaledviewwidth == 320) + return; + + if ( gamemode == commercial) + name = name2; + else + name = name1; + + src = W_CacheLumpName (name, PU_CACHE); + dest = screens[1]; + + for (y=0 ; y<SCREENHEIGHT-SBARHEIGHT ; y++) + { + for (x=0 ; x<SCREENWIDTH/64 ; x++) + { + memcpy (dest, src+((y&63)<<6), 64); + dest += 64; + } + + if (SCREENWIDTH&63) + { + memcpy (dest, src+((y&63)<<6), SCREENWIDTH&63); + dest += (SCREENWIDTH&63); + } + } + + patch = W_CacheLumpName ("brdr_t",PU_CACHE); + + for (x=0 ; x<scaledviewwidth ; x+=8) + V_DrawPatch (viewwindowx+x,viewwindowy-8,1,patch); + patch = W_CacheLumpName ("brdr_b",PU_CACHE); + + for (x=0 ; x<scaledviewwidth ; x+=8) + V_DrawPatch (viewwindowx+x,viewwindowy+viewheight,1,patch); + patch = W_CacheLumpName ("brdr_l",PU_CACHE); + + for (y=0 ; y<viewheight ; y+=8) + V_DrawPatch (viewwindowx-8,viewwindowy+y,1,patch); + patch = W_CacheLumpName ("brdr_r",PU_CACHE); + + for (y=0 ; y<viewheight ; y+=8) + V_DrawPatch (viewwindowx+scaledviewwidth,viewwindowy+y,1,patch); + + + // Draw beveled edge. + V_DrawPatch (viewwindowx-8, + viewwindowy-8, + 1, + W_CacheLumpName ("brdr_tl",PU_CACHE)); + + V_DrawPatch (viewwindowx+scaledviewwidth, + viewwindowy-8, + 1, + W_CacheLumpName ("brdr_tr",PU_CACHE)); + + V_DrawPatch (viewwindowx-8, + viewwindowy+viewheight, + 1, + W_CacheLumpName ("brdr_bl",PU_CACHE)); + + V_DrawPatch (viewwindowx+scaledviewwidth, + viewwindowy+viewheight, + 1, + W_CacheLumpName ("brdr_br",PU_CACHE)); +} + + +// +// Copy a screen buffer. +// +void +R_VideoErase +( unsigned ofs, + int count ) +{ + // LFB copy. + // This might not be a good idea if memcpy + // is not optiomal, e.g. byte by byte on + // a 32bit CPU, as GNU GCC/Linux libc did + // at one point. + memcpy (screens[0]+ofs, screens[1]+ofs, count); +} + + +// +// R_DrawViewBorder +// Draws the border around the view +// for different size windows? +// +void +V_MarkRect +( int x, + int y, + int width, + int height ); + +void R_DrawViewBorder (void) +{ + int top; + int side; + int ofs; + int i; + + if (scaledviewwidth == SCREENWIDTH) + return; + + top = ((SCREENHEIGHT-SBARHEIGHT)-viewheight)/2; + side = (SCREENWIDTH-scaledviewwidth)/2; + + // copy top and one line of left side + R_VideoErase (0, top*SCREENWIDTH+side); + + // copy one line of right side and bottom + ofs = (viewheight+top)*SCREENWIDTH-side; + R_VideoErase (ofs, top*SCREENWIDTH+side); + + // copy sides using wraparound + ofs = top*SCREENWIDTH + SCREENWIDTH-side; + side <<= 1; + + for (i=1 ; i<viewheight ; i++) + { + R_VideoErase (ofs, side); + ofs += SCREENWIDTH; + } + + // ? + V_MarkRect (0,0,SCREENWIDTH, SCREENHEIGHT-SBARHEIGHT); +} + + |