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-rw-r--r--src/hexen/r_plane.c559
1 files changed, 559 insertions, 0 deletions
diff --git a/src/hexen/r_plane.c b/src/hexen/r_plane.c
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+
+//**************************************************************************
+//**
+//** r_plane.c : Heretic 2 : Raven Software, Corp.
+//**
+//** $RCSfile: r_plane.c,v $
+//** $Revision: 1.5 $
+//** $Date: 95/07/13 15:17:12 $
+//** $Author: cjr $
+//**
+//**************************************************************************
+
+// HEADER FILES ------------------------------------------------------------
+
+#include "h2def.h"
+#include "r_local.h"
+
+// MACROS ------------------------------------------------------------------
+
+// TYPES -------------------------------------------------------------------
+
+// EXTERNAL FUNCTION PROTOTYPES --------------------------------------------
+
+// PUBLIC FUNCTION PROTOTYPES ----------------------------------------------
+
+// PRIVATE FUNCTION PROTOTYPES ---------------------------------------------
+
+// EXTERNAL DATA DECLARATIONS ----------------------------------------------
+
+extern fixed_t Sky1ScrollDelta;
+extern fixed_t Sky2ScrollDelta;
+
+// PUBLIC DATA DEFINITIONS -------------------------------------------------
+
+int Sky1Texture;
+int Sky2Texture;
+fixed_t Sky1ColumnOffset;
+fixed_t Sky2ColumnOffset;
+int skyflatnum;
+int skytexturemid;
+fixed_t skyiscale;
+boolean DoubleSky;
+planefunction_t floorfunc, ceilingfunc;
+
+// Opening
+visplane_t visplanes[MAXVISPLANES], *lastvisplane;
+visplane_t *floorplane, *ceilingplane;
+short openings[MAXOPENINGS], *lastopening;
+
+// Clip values are the solid pixel bounding the range.
+// floorclip start out SCREENHEIGHT
+// ceilingclip starts out -1
+short floorclip[SCREENWIDTH];
+short ceilingclip[SCREENWIDTH];
+
+// spanstart holds the start of a plane span, initialized to 0
+int spanstart[SCREENHEIGHT];
+int spanstop[SCREENHEIGHT];
+
+// Texture mapping
+lighttable_t **planezlight;
+fixed_t planeheight;
+fixed_t yslope[SCREENHEIGHT];
+fixed_t distscale[SCREENWIDTH];
+fixed_t basexscale, baseyscale;
+fixed_t cachedheight[SCREENHEIGHT];
+fixed_t cacheddistance[SCREENHEIGHT];
+fixed_t cachedxstep[SCREENHEIGHT];
+fixed_t cachedystep[SCREENHEIGHT];
+
+// PRIVATE DATA DEFINITIONS ------------------------------------------------
+
+// CODE --------------------------------------------------------------------
+
+//==========================================================================
+//
+// R_InitSky
+//
+// Called at level load.
+//
+//==========================================================================
+
+void R_InitSky(int map)
+{
+ Sky1Texture = P_GetMapSky1Texture(map);
+ Sky2Texture = P_GetMapSky2Texture(map);
+ Sky1ScrollDelta = P_GetMapSky1ScrollDelta(map);
+ Sky2ScrollDelta = P_GetMapSky2ScrollDelta(map);
+ Sky1ColumnOffset = 0;
+ Sky2ColumnOffset = 0;
+ DoubleSky = P_GetMapDoubleSky(map);
+}
+
+//==========================================================================
+//
+// R_InitSkyMap
+//
+// Called whenever the view size changes.
+//
+//==========================================================================
+
+void R_InitSkyMap(void)
+{
+ skyflatnum = R_FlatNumForName("F_SKY");
+ skytexturemid = 200*FRACUNIT;
+ skyiscale = FRACUNIT;
+}
+
+//==========================================================================
+//
+// R_InitPlanes
+//
+// Called at game startup.
+//
+//==========================================================================
+
+void R_InitPlanes(void)
+{
+}
+
+//==========================================================================
+//
+// R_MapPlane
+//
+// Globals used: planeheight, ds_source, basexscale, baseyscale,
+// viewx, viewy.
+//
+//==========================================================================
+
+void R_MapPlane(int y, int x1, int x2)
+{
+ angle_t angle;
+ fixed_t distance, length;
+ unsigned index;
+
+#ifdef RANGECHECK
+ if(x2 < x1 || x1 < 0 || x2 >= viewwidth || (unsigned)y > viewheight)
+ {
+ I_Error("R_MapPlane: %i, %i at %i", x1, x2, y);
+ }
+#endif
+
+ if(planeheight != cachedheight[y])
+ {
+ cachedheight[y] = planeheight;
+ distance = cacheddistance[y] = FixedMul(planeheight, yslope[y]);
+ ds_xstep = cachedxstep[y] = FixedMul(distance, basexscale);
+ ds_ystep = cachedystep[y] = FixedMul(distance, baseyscale);
+ }
+ else
+ {
+ distance = cacheddistance[y];
+ ds_xstep = cachedxstep[y];
+ ds_ystep = cachedystep[y];
+ }
+
+ length = FixedMul(distance, distscale[x1]);
+ angle = (viewangle+xtoviewangle[x1])>>ANGLETOFINESHIFT;
+ ds_xfrac = viewx+FixedMul(finecosine[angle], length);
+ ds_yfrac = -viewy-FixedMul(finesine[angle], length);
+
+ if(fixedcolormap)
+ {
+ ds_colormap = fixedcolormap;
+ }
+ else
+ {
+ index = distance >> LIGHTZSHIFT;
+ if(index >= MAXLIGHTZ )
+ {
+ index = MAXLIGHTZ-1;
+ }
+ ds_colormap = planezlight[index];
+ }
+
+ ds_y = y;
+ ds_x1 = x1;
+ ds_x2 = x2;
+
+ spanfunc(); // High or low detail
+}
+
+//==========================================================================
+//
+// R_ClearPlanes
+//
+// Called at the beginning of each frame.
+//
+//==========================================================================
+
+void R_ClearPlanes(void)
+{
+ int i;
+ angle_t angle;
+
+ // Opening / clipping determination
+ for(i = 0; i < viewwidth; i++)
+ {
+ floorclip[i] = viewheight;
+ ceilingclip[i] = -1;
+ }
+
+ lastvisplane = visplanes;
+ lastopening = openings;
+
+ // Texture calculation
+ memset(cachedheight, 0, sizeof(cachedheight));
+ angle = (viewangle-ANG90)>>ANGLETOFINESHIFT; // left to right mapping
+ // Scale will be unit scale at SCREENWIDTH/2 distance
+ basexscale = FixedDiv(finecosine[angle], centerxfrac);
+ baseyscale = -FixedDiv(finesine[angle], centerxfrac);
+}
+
+//==========================================================================
+//
+// R_FindPlane
+//
+//==========================================================================
+
+visplane_t *R_FindPlane(fixed_t height, int picnum,
+ int lightlevel, int special)
+{
+ visplane_t *check;
+
+ if(special < 150)
+ { // Don't let low specials affect search
+ special = 0;
+ }
+
+ if(picnum == skyflatnum)
+ { // All skies map together
+ height = 0;
+ lightlevel = 0;
+ }
+
+ for(check = visplanes; check < lastvisplane; check++)
+ {
+ if(height == check->height
+ && picnum == check->picnum
+ && lightlevel == check->lightlevel
+ && special == check->special)
+ break;
+ }
+
+ if(check < lastvisplane)
+ {
+ return(check);
+ }
+
+ if(lastvisplane-visplanes == MAXVISPLANES)
+ {
+ I_Error("R_FindPlane: no more visplanes");
+ }
+
+ lastvisplane++;
+ check->height = height;
+ check->picnum = picnum;
+ check->lightlevel = lightlevel;
+ check->special = special;
+ check->minx = SCREENWIDTH;
+ check->maxx = -1;
+ memset(check->top, 0xff, sizeof(check->top));
+ return(check);
+}
+
+//==========================================================================
+//
+// R_CheckPlane
+//
+//==========================================================================
+
+visplane_t *R_CheckPlane(visplane_t *pl, int start, int stop)
+{
+ int intrl, intrh;
+ int unionl, unionh;
+ int x;
+
+ if(start < pl->minx)
+ {
+ intrl = pl->minx;
+ unionl = start;
+ }
+ else
+ {
+ unionl = pl->minx;
+ intrl = start;
+ }
+ if(stop > pl->maxx)
+ {
+ intrh = pl->maxx;
+ unionh = stop;
+ }
+ else
+ {
+ unionh = pl->maxx;
+ intrh = stop;
+ }
+
+ for(x = intrl; x <= intrh; x++)
+ {
+ if(pl->top[x] != 0xff)
+ {
+ break;
+ }
+ }
+
+ if(x > intrh)
+ {
+ pl->minx = unionl;
+ pl->maxx = unionh;
+ return pl; // use the same visplane
+ }
+
+ // Make a new visplane
+ lastvisplane->height = pl->height;
+ lastvisplane->picnum = pl->picnum;
+ lastvisplane->lightlevel = pl->lightlevel;
+ lastvisplane->special = pl->special;
+ pl = lastvisplane++;
+ pl->minx = start;
+ pl->maxx = stop;
+ memset(pl->top, 0xff, sizeof(pl->top));
+
+ return pl;
+}
+
+//==========================================================================
+//
+// R_MakeSpans
+//
+//==========================================================================
+
+void R_MakeSpans(int x, int t1, int b1, int t2, int b2)
+{
+ while(t1 < t2 && t1 <= b1)
+ {
+ R_MapPlane(t1, spanstart[t1], x-1);
+ t1++;
+ }
+ while(b1 > b2 && b1 >= t1)
+ {
+ R_MapPlane(b1, spanstart[b1], x-1);
+ b1--;
+ }
+ while(t2 < t1 && t2 <= b2)
+ {
+ spanstart[t2] = x;
+ t2++;
+ }
+ while(b2 > b1 && b2 >= t2)
+ {
+ spanstart[b2] = x;
+ b2--;
+ }
+}
+
+//==========================================================================
+//
+// R_DrawPlanes
+//
+//==========================================================================
+
+#define SKYTEXTUREMIDSHIFTED 200
+
+void R_DrawPlanes(void)
+{
+ visplane_t *pl;
+ int light;
+ int x, stop;
+ int angle;
+ byte *tempSource;
+ byte *source;
+ byte *source2;
+ byte *dest;
+ int count;
+ int offset;
+ int skyTexture;
+ int offset2;
+ int skyTexture2;
+ int scrollOffset;
+
+ extern byte *ylookup[MAXHEIGHT];
+ extern int columnofs[MAXWIDTH];
+
+#ifdef RANGECHECK
+ if(ds_p-drawsegs > MAXDRAWSEGS)
+ {
+ I_Error("R_DrawPlanes: drawsegs overflow (%i)", ds_p-drawsegs);
+ }
+ if(lastvisplane-visplanes > MAXVISPLANES)
+ {
+ I_Error("R_DrawPlanes: visplane overflow (%i)",
+ lastvisplane-visplanes);
+ }
+ if(lastopening-openings > MAXOPENINGS)
+ {
+ I_Error("R_DrawPlanes: opening overflow (%i)",
+ lastopening-openings);
+ }
+#endif
+
+ for(pl = visplanes; pl < lastvisplane; pl++)
+ {
+ if(pl->minx > pl->maxx)
+ {
+ continue;
+ }
+ if(pl->picnum == skyflatnum)
+ { // Sky flat
+ if(DoubleSky)
+ { // Render 2 layers, sky 1 in front
+ offset = Sky1ColumnOffset>>16;
+ skyTexture = texturetranslation[Sky1Texture];
+ offset2 = Sky2ColumnOffset>>16;
+ skyTexture2 = texturetranslation[Sky2Texture];
+ for(x = pl->minx; x <= pl->maxx; x++)
+ {
+ dc_yl = pl->top[x];
+ dc_yh = pl->bottom[x];
+ if(dc_yl <= dc_yh)
+ {
+ count = dc_yh-dc_yl;
+ if(count < 0)
+ {
+ return;
+ }
+ angle = (viewangle+xtoviewangle[x])
+ >>ANGLETOSKYSHIFT;
+ source = R_GetColumn(skyTexture, angle+offset)
+ +SKYTEXTUREMIDSHIFTED+(dc_yl-centery);
+ source2 = R_GetColumn(skyTexture2, angle+offset2)
+ +SKYTEXTUREMIDSHIFTED+(dc_yl-centery);
+ dest = ylookup[dc_yl]+columnofs[x];
+ do
+ {
+ if(*source)
+ {
+ *dest = *source++;
+ source2++;
+ }
+ else
+ {
+ *dest = *source2++;
+ source++;
+ }
+ dest += SCREENWIDTH;
+ } while(count--);
+ }
+ }
+ continue; // Next visplane
+ }
+ else
+ { // Render single layer
+ if(pl->special == 200)
+ { // Use sky 2
+ offset = Sky2ColumnOffset>>16;
+ skyTexture = texturetranslation[Sky2Texture];
+ }
+ else
+ { // Use sky 1
+ offset = Sky1ColumnOffset>>16;
+ skyTexture = texturetranslation[Sky1Texture];
+ }
+ for(x = pl->minx; x <= pl->maxx; x++)
+ {
+ dc_yl = pl->top[x];
+ dc_yh = pl->bottom[x];
+ if(dc_yl <= dc_yh)
+ {
+ count = dc_yh-dc_yl;
+ if(count < 0)
+ {
+ return;
+ }
+ angle = (viewangle+xtoviewangle[x])
+ >>ANGLETOSKYSHIFT;
+ source = R_GetColumn(skyTexture, angle+offset)
+ +SKYTEXTUREMIDSHIFTED+(dc_yl-centery);
+ dest = ylookup[dc_yl]+columnofs[x];
+ do
+ {
+ *dest = *source++;
+ dest += SCREENWIDTH;
+ } while(count--);
+ }
+ }
+ continue; // Next visplane
+ }
+ }
+ // Regular flat
+ tempSource = W_CacheLumpNum(firstflat+
+ flattranslation[pl->picnum], PU_STATIC);
+ scrollOffset = leveltime>>1&63;
+ switch(pl->special)
+ { // Handle scrolling flats
+ case 201: case 202: case 203: // Scroll_North_xxx
+ ds_source = tempSource+((scrollOffset
+ <<(pl->special-201)&63)<<6);
+ break;
+ case 204: case 205: case 206: // Scroll_East_xxx
+ ds_source = tempSource+((63-scrollOffset)
+ <<(pl->special-204)&63);
+ break;
+ case 207: case 208: case 209: // Scroll_South_xxx
+ ds_source = tempSource+(((63-scrollOffset)
+ <<(pl->special-207)&63)<<6);
+ break;
+ case 210: case 211: case 212: // Scroll_West_xxx
+ ds_source = tempSource+(scrollOffset
+ <<(pl->special-210)&63);
+ break;
+ case 213: case 214: case 215: // Scroll_NorthWest_xxx
+ ds_source = tempSource+(scrollOffset
+ <<(pl->special-213)&63)+((scrollOffset
+ <<(pl->special-213)&63)<<6);
+ break;
+ case 216: case 217: case 218: // Scroll_NorthEast_xxx
+ ds_source = tempSource+((63-scrollOffset)
+ <<(pl->special-216)&63)+((scrollOffset
+ <<(pl->special-216)&63)<<6);
+ break;
+ case 219: case 220: case 221: // Scroll_SouthEast_xxx
+ ds_source = tempSource+((63-scrollOffset)
+ <<(pl->special-219)&63)+(((63-scrollOffset)
+ <<(pl->special-219)&63)<<6);
+ break;
+ case 222: case 223: case 224: // Scroll_SouthWest_xxx
+ ds_source = tempSource+(scrollOffset
+ <<(pl->special-222)&63)+(((63-scrollOffset)
+ <<(pl->special-222)&63)<<6);
+ break;
+ default:
+ ds_source = tempSource;
+ break;
+ }
+ planeheight = abs(pl->height-viewz);
+ light = (pl->lightlevel >> LIGHTSEGSHIFT)+extralight;
+ if(light >= LIGHTLEVELS)
+ {
+ light = LIGHTLEVELS-1;
+ }
+ if(light < 0)
+ {
+ light = 0;
+ }
+ planezlight = zlight[light];
+
+ pl->top[pl->maxx+1] = 0xff;
+ pl->top[pl->minx-1] = 0xff;
+
+ stop = pl->maxx+1;
+ for(x = pl->minx; x <= stop; x++)
+ {
+ R_MakeSpans(x, pl->top[x-1], pl->bottom[x-1],
+ pl->top[x], pl->bottom[x]);
+ }
+ Z_ChangeTag(tempSource, PU_CACHE);
+ }
+}
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