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-rw-r--r--src/hexen/r_plane.c590
1 files changed, 590 insertions, 0 deletions
diff --git a/src/hexen/r_plane.c b/src/hexen/r_plane.c
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+// Emacs style mode select -*- C++ -*-
+//-----------------------------------------------------------------------------
+//
+// Copyright(C) 1993-1996 Id Software, Inc.
+// Copyright(C) 1993-2008 Raven Software
+// Copyright(C) 2008 Simon Howard
+//
+// 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.
+//
+//-----------------------------------------------------------------------------
+
+
+// HEADER FILES ------------------------------------------------------------
+
+#include "h2def.h"
+#include "i_system.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]);
+ }
+ W_ReleaseLumpNum(firstflat + flattranslation[pl->picnum]);
+ }
+}
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