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qzdoom-gpl/src/r_plane.cpp
Christoph Oelckers 158caf78a0 - more float to double conversion. 
In particular this removes all assignments of FIXED2FLOAT to double variables because they not only lose precision but also generate unnecessary code.
2016-02-11 21:33:30 +01:00

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// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// $Id:$
//
// 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.
//
// $Log:$
//
// DESCRIPTION:
// Here is a core component: drawing the floors and ceilings,
// while maintaining a per column clipping list only.
// Moreover, the sky areas have to be determined.
//
// MAXVISPLANES is no longer a limit on the number of visplanes,
// but a limit on the number of hash slots; larger numbers mean
// better performance usually but after a point they are wasted,
// and memory and time overheads creep in.
//
// Lee Killough
//
// [RH] Further modified to significantly increase accuracy and add slopes.
//
//-----------------------------------------------------------------------------
#include <stdlib.h>
#include <float.h>
#include "templates.h"
#include "i_system.h"
#include "w_wad.h"
#include "doomdef.h"
#include "doomstat.h"
#include "r_local.h"
#include "r_sky.h"
#include "stats.h"
#include "v_video.h"
#include "a_sharedglobal.h"
#include "c_console.h"
#include "cmdlib.h"
#include "d_net.h"
#include "g_level.h"
#include "r_bsp.h"
#include "r_plane.h"
#include "r_segs.h"
#include "r_3dfloors.h"
#include "v_palette.h"
#include "r_data/colormaps.h"
#include "portal.h"
#ifdef _MSC_VER
#pragma warning(disable:4244)
#endif
//EXTERN_CVAR (Int, tx)
//EXTERN_CVAR (Int, ty)
static void R_DrawSkyStriped (visplane_t *pl);
planefunction_t floorfunc;
planefunction_t ceilingfunc;
// Here comes the obnoxious "visplane".
#define MAXVISPLANES 128 /* must be a power of 2 */
// Avoid infinite recursion with stacked sectors by limiting them.
#define MAX_SKYBOX_PLANES 1000
// [RH] Allocate one extra for sky box planes.
static visplane_t *visplanes[MAXVISPLANES+1]; // killough
static visplane_t *freetail; // killough
static visplane_t **freehead = &freetail; // killough
visplane_t *floorplane;
visplane_t *ceilingplane;
// killough -- hash function for visplanes
// Empirically verified to be fairly uniform:
#define visplane_hash(picnum,lightlevel,height) \
((unsigned)((picnum)*3+(lightlevel)+((height).d)*7) & (MAXVISPLANES-1))
// These are copies of the main parameters used when drawing stacked sectors.
// When you change the main parameters, you should copy them here too *unless*
// you are changing them to draw a stacked sector. Otherwise, stacked sectors
// won't draw in skyboxes properly.
int stacked_extralight;
float stacked_visibility;
fixed_t stacked_viewx, stacked_viewy, stacked_viewz;
angle_t stacked_angle;
//
// opening
//
size_t maxopenings;
short *openings;
ptrdiff_t lastopening;
//
// Clip values are the solid pixel bounding the range.
// floorclip starts out SCREENHEIGHT and is just outside the range
// ceilingclip starts out 0 and is just inside the range
//
short floorclip[MAXWIDTH];
short ceilingclip[MAXWIDTH];
//
// texture mapping
//
static fixed_t planeheight;
extern "C" {
//
// spanend holds the end of a plane span in each screen row
//
short spanend[MAXHEIGHT];
BYTE *tiltlighting[MAXWIDTH];
int planeshade;
FVector3 plane_sz, plane_su, plane_sv;
float planelightfloat;
bool plane_shade;
fixed_t pviewx, pviewy;
void R_DrawTiltedPlane_ASM (int y, int x1);
}
fixed_t yslope[MAXHEIGHT];
static fixed_t xscale, yscale;
static DWORD xstepscale, ystepscale;
static DWORD basexfrac, baseyfrac;
#ifdef X86_ASM
extern "C" void R_SetSpanSource_ASM (const BYTE *flat);
extern "C" void STACK_ARGS R_SetSpanSize_ASM (int xbits, int ybits);
extern "C" void R_SetSpanColormap_ASM (BYTE *colormap);
extern "C" void R_SetTiltedSpanSource_ASM (const BYTE *flat);
extern "C" BYTE *ds_curcolormap, *ds_cursource, *ds_curtiltedsource;
#endif
void R_DrawSinglePlane (visplane_t *, fixed_t alpha, bool additive, bool masked);
//==========================================================================
//
// R_InitPlanes
//
// Called at game startup.
//
//==========================================================================
void R_InitPlanes ()
{
}
//==========================================================================
//
// R_DeinitPlanes
//
//==========================================================================
void R_DeinitPlanes ()
{
fakeActive = 0;
// do not use R_ClearPlanes because at this point the screen pointer is no longer valid.
for (int i = 0; i <= MAXVISPLANES; i++) // new code -- killough
{
for (*freehead = visplanes[i], visplanes[i] = NULL; *freehead; )
{
freehead = &(*freehead)->next;
}
}
for (visplane_t *pl = freetail; pl != NULL; )
{
visplane_t *next = pl->next;
free (pl);
pl = next;
}
}
//==========================================================================
//
// R_MapPlane
//
// Globals used: planeheight, ds_source, basexscale, baseyscale,
// pviewx, pviewy, xoffs, yoffs, basecolormap, xscale, yscale.
//
//==========================================================================
void R_MapPlane (int y, int x1)
{
int x2 = spanend[y];
fixed_t distance;
#ifdef RANGECHECK
if (x2 < x1 || x1<0 || x2>=viewwidth || (unsigned)y>=(unsigned)viewheight)
{
I_FatalError ("R_MapPlane: %i, %i at %i", x1, x2, y);
}
#endif
// [RH] Notice that I dumped the caching scheme used by Doom.
// It did not offer any appreciable speedup.
distance = FixedMul (planeheight, yslope[y]);
ds_xstep = FixedMul (distance, xstepscale);
ds_ystep = FixedMul (distance, ystepscale);
ds_xfrac = FixedMul (distance, basexfrac) + pviewx;
ds_yfrac = FixedMul (distance, baseyfrac) + pviewy;
if (plane_shade)
{
// Determine lighting based on the span's distance from the viewer.
ds_colormap = basecolormap->Maps + (GETPALOOKUP (
FixedMul (GlobVis, abs (centeryfrac - (y << FRACBITS))), planeshade) << COLORMAPSHIFT);
}
#ifdef X86_ASM
if (ds_colormap != ds_curcolormap)
R_SetSpanColormap_ASM (ds_colormap);
#endif
ds_y = y;
ds_x1 = x1;
ds_x2 = x2;
spanfunc ();
}
//==========================================================================
//
// R_CalcTiltedLighting
//
// Calculates the lighting for one row of a tilted plane. If the definition
// of GETPALOOKUP changes, this needs to change, too.
//
//==========================================================================
extern "C" {
void STACK_ARGS R_CalcTiltedLighting (fixed_t lval, fixed_t lend, int width)
{
fixed_t lstep;
BYTE *lightfiller;
BYTE *basecolormapdata = basecolormap->Maps;
int i = 0;
if (width == 0 || lval == lend)
{ // Constant lighting
lightfiller = basecolormapdata + (GETPALOOKUP(lval, planeshade) << COLORMAPSHIFT);
}
else
{
lstep = (lend - lval) / width;
if (lval >= MAXLIGHTVIS)
{ // lval starts "too bright".
lightfiller = basecolormapdata + (GETPALOOKUP(lval, planeshade) << COLORMAPSHIFT);
for (; i <= width && lval >= MAXLIGHTVIS; ++i)
{
tiltlighting[i] = lightfiller;
lval += lstep;
}
}
if (lend >= MAXLIGHTVIS)
{ // lend ends "too bright".
lightfiller = basecolormapdata + (GETPALOOKUP(lend, planeshade) << COLORMAPSHIFT);
for (; width > i && lend >= MAXLIGHTVIS; --width)
{
tiltlighting[width] = lightfiller;
lend -= lstep;
}
}
if (width > 0)
{
lval = planeshade - lval;
lend = planeshade - lend;
lstep = (lend - lval) / width;
if (lstep < 0)
{ // Going from dark to light
if (lval < FRACUNIT)
{ // All bright
lightfiller = basecolormapdata;
}
else
{
if (lval >= NUMCOLORMAPS*FRACUNIT)
{ // Starts beyond the dark end
BYTE *clight = basecolormapdata + ((NUMCOLORMAPS-1) << COLORMAPSHIFT);
while (lval >= NUMCOLORMAPS*FRACUNIT && i <= width)
{
tiltlighting[i++] = clight;
lval += lstep;
}
if (i > width)
return;
}
while (i <= width && lval >= 0)
{
tiltlighting[i++] = basecolormapdata + ((lval >> FRACBITS) << COLORMAPSHIFT);
lval += lstep;
}
lightfiller = basecolormapdata;
}
}
else
{ // Going from light to dark
if (lval >= (NUMCOLORMAPS-1)*FRACUNIT)
{ // All dark
lightfiller = basecolormapdata + ((NUMCOLORMAPS-1) << COLORMAPSHIFT);
}
else
{
while (lval < 0 && i <= width)
{
tiltlighting[i++] = basecolormapdata;
lval += lstep;
}
if (i > width)
return;
while (i <= width && lval < (NUMCOLORMAPS-1)*FRACUNIT)
{
tiltlighting[i++] = basecolormapdata + ((lval >> FRACBITS) << COLORMAPSHIFT);
lval += lstep;
}
lightfiller = basecolormapdata + ((NUMCOLORMAPS-1) << COLORMAPSHIFT);
}
}
}
}
for (; i <= width; i++)
{
tiltlighting[i] = lightfiller;
}
}
} // extern "C"
//==========================================================================
//
// R_MapTiltedPlane
//
//==========================================================================
void R_MapTiltedPlane (int y, int x1)
{
int x2 = spanend[y];
int width = x2 - x1;
double iz, uz, vz;
BYTE *fb;
DWORD u, v;
int i;
iz = plane_sz[2] + plane_sz[1]*(centery-y) + plane_sz[0]*(x1-centerx);
// Lighting is simple. It's just linear interpolation from start to end
if (plane_shade)
{
uz = (iz + plane_sz[0]*width) * planelightfloat;
vz = iz * planelightfloat;
R_CalcTiltedLighting (xs_RoundToInt(vz), xs_RoundToInt(uz), width);
}
uz = plane_su[2] + plane_su[1]*(centery-y) + plane_su[0]*(x1-centerx);
vz = plane_sv[2] + plane_sv[1]*(centery-y) + plane_sv[0]*(x1-centerx);
fb = ylookup[y] + x1 + dc_destorg;
BYTE vshift = 32 - ds_ybits;
BYTE ushift = vshift - ds_xbits;
int umask = ((1 << ds_xbits) - 1) << ds_ybits;
#if 0 // The "perfect" reference version of this routine. Pretty slow.
// Use it only to see how things are supposed to look.
i = 0;
do
{
double z = 1.f/iz;
u = SQWORD(uz*z) + pviewx;
v = SQWORD(vz*z) + pviewy;
ds_colormap = tiltlighting[i];
fb[i++] = ds_colormap[ds_source[(v >> vshift) | ((u >> ushift) & umask)]];
iz += plane_sz[0];
uz += plane_su[0];
vz += plane_sv[0];
} while (--width >= 0);
#else
//#define SPANSIZE 32
//#define INVSPAN 0.03125f
//#define SPANSIZE 8
//#define INVSPAN 0.125f
#define SPANSIZE 16
#define INVSPAN 0.0625f
double startz = 1.f/iz;
double startu = uz*startz;
double startv = vz*startz;
double izstep, uzstep, vzstep;
izstep = plane_sz[0] * SPANSIZE;
uzstep = plane_su[0] * SPANSIZE;
vzstep = plane_sv[0] * SPANSIZE;
x1 = 0;
width++;
while (width >= SPANSIZE)
{
iz += izstep;
uz += uzstep;
vz += vzstep;
double endz = 1.f/iz;
double endu = uz*endz;
double endv = vz*endz;
DWORD stepu = SQWORD((endu - startu) * INVSPAN);
DWORD stepv = SQWORD((endv - startv) * INVSPAN);
u = SQWORD(startu) + pviewx;
v = SQWORD(startv) + pviewy;
for (i = SPANSIZE-1; i >= 0; i--)
{
fb[x1] = *(tiltlighting[x1] + ds_source[(v >> vshift) | ((u >> ushift) & umask)]);
x1++;
u += stepu;
v += stepv;
}
startu = endu;
startv = endv;
width -= SPANSIZE;
}
if (width > 0)
{
if (width == 1)
{
u = SQWORD(startu);
v = SQWORD(startv);
fb[x1] = *(tiltlighting[x1] + ds_source[(v >> vshift) | ((u >> ushift) & umask)]);
}
else
{
double left = width;
iz += plane_sz[0] * left;
uz += plane_su[0] * left;
vz += plane_sv[0] * left;
double endz = 1.f/iz;
double endu = uz*endz;
double endv = vz*endz;
left = 1.f/left;
DWORD stepu = SQWORD((endu - startu) * left);
DWORD stepv = SQWORD((endv - startv) * left);
u = SQWORD(startu) + pviewx;
v = SQWORD(startv) + pviewy;
for (; width != 0; width--)
{
fb[x1] = *(tiltlighting[x1] + ds_source[(v >> vshift) | ((u >> ushift) & umask)]);
x1++;
u += stepu;
v += stepv;
}
}
}
#endif
}
//==========================================================================
//
// R_MapColoredPlane
//
//==========================================================================
void R_MapColoredPlane (int y, int x1)
{
memset (ylookup[y] + x1 + dc_destorg, ds_color, spanend[y] - x1 + 1);
}
//==========================================================================
//
// R_ClearPlanes
//
// Called at the beginning of each frame.
//
//==========================================================================
void R_ClearPlanes (bool fullclear)
{
int i;
// Don't clear fake planes if not doing a full clear.
if (!fullclear)
{
for (i = 0; i <= MAXVISPLANES-1; i++) // new code -- killough
{
for (visplane_t **probe = &visplanes[i]; *probe != NULL; )
{
if ((*probe)->sky < 0)
{ // fake: move past it
probe = &(*probe)->next;
}
else
{ // not fake: move to freelist
visplane_t *vis = *probe;
*freehead = vis;
*probe = vis->next;
vis->next = NULL;
freehead = &vis->next;
}
}
}
}
else
{
for (i = 0; i <= MAXVISPLANES; i++) // new code -- killough
{
for (*freehead = visplanes[i], visplanes[i] = NULL; *freehead; )
{
freehead = &(*freehead)->next;
}
}
// opening / clipping determination
clearbufshort (floorclip, viewwidth, viewheight);
// [RH] clip ceiling to console bottom
clearbufshort (ceilingclip, viewwidth,
!screen->Accel2D && ConBottom > viewwindowy && !bRenderingToCanvas
? (ConBottom - viewwindowy) : 0);
lastopening = 0;
}
}
//==========================================================================
//
// new_visplane
//
// New function, by Lee Killough
// [RH] top and bottom buffers get allocated immediately after the visplane.
//
//==========================================================================
static visplane_t *new_visplane (unsigned hash)
{
visplane_t *check = freetail;
if (check == NULL)
{
check = (visplane_t *)M_Malloc (sizeof(*check) + 3 + sizeof(*check->top)*(MAXWIDTH*2));
memset(check, 0, sizeof(*check) + 3 + sizeof(*check->top)*(MAXWIDTH*2));
check->bottom = check->top + MAXWIDTH+2;
}
else if (NULL == (freetail = freetail->next))
{
freehead = &freetail;
}
check->next = visplanes[hash];
visplanes[hash] = check;
return check;
}
//==========================================================================
//
// R_FindPlane
//
// killough 2/28/98: Add offsets
//==========================================================================
visplane_t *R_FindPlane (const secplane_t &height, FTextureID picnum, int lightlevel, fixed_t alpha, bool additive,
fixed_t xoffs, fixed_t yoffs,
fixed_t xscale, fixed_t yscale, angle_t angle,
int sky, ASkyViewpoint *skybox)
{
secplane_t plane;
visplane_t *check;
unsigned hash; // killough
bool isskybox;
if (picnum == skyflatnum) // killough 10/98
{ // most skies map together
lightlevel = 0;
xoffs = 0;
yoffs = 0;
xscale = 0;
yscale = 0;
angle = 0;
alpha = 0;
additive = false;
plane.a = plane.b = plane.d = 0;
// [RH] Map floor skies and ceiling skies to separate visplanes. This isn't
// always necessary, but it is needed if a floor and ceiling sky are in the
// same column but separated by a wall. If they both try to reside in the
// same visplane, then only the floor sky will be drawn.
plane.c = height.c;
plane.ic = height.ic;
isskybox = skybox != NULL && !skybox->bInSkybox;
}
else if (skybox != NULL && skybox->bAlways && !skybox->bInSkybox)
{
plane = height;
isskybox = true;
}
else
{
plane = height;
isskybox = false;
// kg3D - hack, store alpha in sky
// i know there is ->alpha, but this also allows to identify fake plane
// and ->alpha is for stacked sectors
if (fake3D & (FAKE3D_FAKEFLOOR|FAKE3D_FAKECEILING)) sky = 0x80000000 | fakeAlpha;
else sky = 0; // not skyflatnum so it can't be a sky
skybox = NULL;
alpha = FRACUNIT;
}
// New visplane algorithm uses hash table -- killough
hash = isskybox ? MAXVISPLANES : visplane_hash (picnum.GetIndex(), lightlevel, height);
for (check = visplanes[hash]; check; check = check->next) // killough
{
if (isskybox)
{
if (skybox == check->skybox && plane == check->height)
{
if (skybox->Mate != NULL)
{ // This skybox is really a stacked sector, so we need to
// check even more.
if (check->extralight == stacked_extralight &&
check->visibility == stacked_visibility &&
check->viewx == stacked_viewx &&
check->viewy == stacked_viewy &&
check->viewz == stacked_viewz &&
(
// headache inducing logic... :(
(!(skybox->flags & MF_JUSTATTACKED)) ||
(
check->Alpha == alpha &&
check->Additive == additive &&
(alpha == 0 || // if alpha is > 0 everything needs to be checked
(plane == check->height &&
picnum == check->picnum &&
lightlevel == check->lightlevel &&
xoffs == check->xoffs && // killough 2/28/98: Add offset checks
yoffs == check->yoffs &&
basecolormap == check->colormap && // [RH] Add more checks
xscale == check->xscale &&
yscale == check->yscale &&
angle == check->angle
)
) &&
check->viewangle == stacked_angle
)
)
)
{
return check;
}
}
else
{
return check;
}
}
}
else
if (plane == check->height &&
picnum == check->picnum &&
lightlevel == check->lightlevel &&
xoffs == check->xoffs && // killough 2/28/98: Add offset checks
yoffs == check->yoffs &&
basecolormap == check->colormap && // [RH] Add more checks
xscale == check->xscale &&
yscale == check->yscale &&
angle == check->angle &&
sky == check->sky &&
CurrentPortalUniq == check->CurrentPortalUniq &&
MirrorFlags == check->MirrorFlags &&
CurrentSkybox == check->CurrentSkybox &&
viewx == check->viewx &&
viewy == check->viewy &&
viewz == check->viewz
)
{
return check;
}
}
check = new_visplane (hash); // killough
check->height = plane;
check->picnum = picnum;
check->lightlevel = lightlevel;
check->xoffs = xoffs; // killough 2/28/98: Save offsets
check->yoffs = yoffs;
check->xscale = xscale;
check->yscale = yscale;
check->angle = angle;
check->colormap = basecolormap; // [RH] Save colormap
check->sky = sky;
check->skybox = skybox;
check->left = viewwidth; // Was SCREENWIDTH -- killough 11/98
check->right = 0;
check->extralight = stacked_extralight;
check->visibility = stacked_visibility;
check->viewx = stacked_viewx;
check->viewy = stacked_viewy;
check->viewz = stacked_viewz;
check->viewangle = stacked_angle;
check->Alpha = alpha;
check->Additive = additive;
check->CurrentPortalUniq = CurrentPortalUniq;
check->MirrorFlags = MirrorFlags;
check->CurrentSkybox = CurrentSkybox;
clearbufshort (check->top, viewwidth, 0x7fff);
return check;
}
//==========================================================================
//
// R_CheckPlane
//
//==========================================================================
visplane_t *R_CheckPlane (visplane_t *pl, int start, int stop)
{
int intrl, intrh;
int unionl, unionh;
int x;
assert (start >= 0 && start < viewwidth);
assert (stop > start && stop <= viewwidth);
if (start < pl->left)
{
intrl = pl->left;
unionl = start;
}
else
{
unionl = pl->left;
intrl = start;
}
if (stop > pl->right)
{
intrh = pl->right;
unionh = stop;
}
else
{
unionh = pl->right;
intrh = stop;
}
for (x = intrl; x < intrh && pl->top[x] == 0x7fff; x++)
;
if (x >= intrh)
{
// use the same visplane
pl->left = unionl;
pl->right = unionh;
}
else
{
// make a new visplane
unsigned hash;
if (pl->skybox != NULL && !pl->skybox->bInSkybox && (pl->picnum == skyflatnum || pl->skybox->bAlways) && viewactive)
{
hash = MAXVISPLANES;
}
else
{
hash = visplane_hash (pl->picnum.GetIndex(), pl->lightlevel, pl->height);
}
visplane_t *new_pl = new_visplane (hash);
new_pl->height = pl->height;
new_pl->picnum = pl->picnum;
new_pl->lightlevel = pl->lightlevel;
new_pl->xoffs = pl->xoffs; // killough 2/28/98
new_pl->yoffs = pl->yoffs;
new_pl->xscale = pl->xscale; // [RH] copy these, too
new_pl->yscale = pl->yscale;
new_pl->angle = pl->angle;
new_pl->colormap = pl->colormap;
new_pl->skybox = pl->skybox;
new_pl->extralight = pl->extralight;
new_pl->visibility = pl->visibility;
new_pl->viewx = pl->viewx;
new_pl->viewy = pl->viewy;
new_pl->viewz = pl->viewz;
new_pl->viewangle = pl->viewangle;
new_pl->sky = pl->sky;
new_pl->Alpha = pl->Alpha;
new_pl->Additive = pl->Additive;
new_pl->CurrentPortalUniq = pl->CurrentPortalUniq;
new_pl->MirrorFlags = pl->MirrorFlags;
new_pl->CurrentSkybox = pl->CurrentSkybox;
pl = new_pl;
pl->left = start;
pl->right = stop;
clearbufshort (pl->top, viewwidth, 0x7fff);
}
return pl;
}
//==========================================================================
//
// R_MakeSpans
//
//
//==========================================================================
inline void R_MakeSpans (int x, int t1, int b1, int t2, int b2, void (*mapfunc)(int y, int x1))
{
}
//==========================================================================
//
// R_DrawSky
//
// Can handle overlapped skies. Note that the front sky is *not* masked in
// in the normal convention for patches, but uses color 0 as a transparent
// color instead.
//
// Note that since ZDoom now uses color 0 as transparent for other purposes,
// you can use normal texture transparency, so the distinction isn't so
// important anymore, but you should still be aware of it.
//
//==========================================================================
static FTexture *frontskytex, *backskytex;
static angle_t skyflip;
static int frontpos, backpos;
static fixed_t frontyScale;
static fixed_t frontcyl, backcyl;
static fixed_t skymid;
static angle_t skyangle;
int frontiScale;
extern fixed_t swall[MAXWIDTH];
extern fixed_t lwall[MAXWIDTH];
extern fixed_t rw_offset;
extern FTexture *rw_pic;
// Allow for layer skies up to 512 pixels tall. This is overkill,
// since the most anyone can ever see of the sky is 500 pixels.
// We need 4 skybufs because wallscan can draw up to 4 columns at a time.
static BYTE skybuf[4][512];
static DWORD lastskycol[4];
static int skycolplace;
// Get a column of sky when there is only one sky texture.
static const BYTE *R_GetOneSkyColumn (FTexture *fronttex, int x)
{
angle_t column = (skyangle + xtoviewangle[x]) ^ skyflip;
return fronttex->GetColumn((UMulScale16(column, frontcyl) + frontpos) >> FRACBITS, NULL);
}
// Get a column of sky when there are two overlapping sky textures
static const BYTE *R_GetTwoSkyColumns (FTexture *fronttex, int x)
{
DWORD ang = (skyangle + xtoviewangle[x]) ^ skyflip;
DWORD angle1 = (DWORD)((UMulScale16(ang, frontcyl) + frontpos) >> FRACBITS);
DWORD angle2 = (DWORD)((UMulScale16(ang, backcyl) + backpos) >> FRACBITS);
// Check if this column has already been built. If so, there's
// no reason to waste time building it again.
DWORD skycol = (angle1 << 16) | angle2;
int i;
for (i = 0; i < 4; ++i)
{
if (lastskycol[i] == skycol)
{
return skybuf[i];
}
}
lastskycol[skycolplace] = skycol;
BYTE *composite = skybuf[skycolplace];
skycolplace = (skycolplace + 1) & 3;
// The ordering of the following code has been tuned to allow VC++ to optimize
// it well. In particular, this arrangement lets it keep count in a register
// instead of on the stack.
const BYTE *front = fronttex->GetColumn (angle1, NULL);
const BYTE *back = backskytex->GetColumn (angle2, NULL);
int count = MIN<int> (512, MIN (backskytex->GetHeight(), fronttex->GetHeight()));
i = 0;
do
{
if (front[i])
{
composite[i] = front[i];
}
else
{
composite[i] = back[i];
}
} while (++i, --count);
return composite;
}
static void R_DrawSky (visplane_t *pl)
{
int x;
if (pl->left >= pl->right)
return;
dc_iscale = skyiscale;
clearbuf (swall+pl->left, pl->right-pl->left, dc_iscale<<2);
if (MirrorFlags & RF_XFLIP)
{
for (x = pl->left; x < pl->right; ++x)
{
lwall[x] = (viewwidth - x) << FRACBITS;
}
}
else
{
for (x = pl->left; x < pl->right; ++x)
{
lwall[x] = x << FRACBITS;
}
}
for (x = 0; x < 4; ++x)
{
lastskycol[x] = 0xffffffff;
}
rw_pic = frontskytex;
rw_offset = 0;
frontyScale = rw_pic->yScale;
dc_texturemid = MulScale16 (skymid, frontyScale);
if (1 << frontskytex->HeightBits == frontskytex->GetHeight())
{ // The texture tiles nicely
for (x = 0; x < 4; ++x)
{
lastskycol[x] = 0xffffffff;
}
wallscan (pl->left, pl->right, (short *)pl->top, (short *)pl->bottom, swall, lwall,
frontyScale, backskytex == NULL ? R_GetOneSkyColumn : R_GetTwoSkyColumns);
}
else
{ // The texture does not tile nicely
frontyScale = DivScale16 (skyscale, frontyScale);
frontiScale = DivScale32 (1, frontyScale);
// Sodding crap. Fixed point sucks when you want precision.
// TODO (if I'm feeling adventurous): Rewrite the renderer to use floating point
// coordinates to keep as much precision as possible until the final
// rasterization stage so fudges like this aren't needed.
if (viewheight <= 600)
{
skymid -= FRACUNIT;
}
R_DrawSkyStriped (pl);
}
}
static void R_DrawSkyStriped (visplane_t *pl)
{
fixed_t centerysave = centeryfrac;
short drawheight = (short)MulScale16 (frontskytex->GetHeight(), frontyScale);
fixed_t topfrac;
fixed_t iscale = frontiScale;
short top[MAXWIDTH], bot[MAXWIDTH];
short yl, yh;
int x;
// So that I don't have to worry about fractional precision, chop off the
// fractional part of centeryfrac.
centeryfrac = centery << FRACBITS;
topfrac = (skymid + iscale * (1-centery)) % (frontskytex->GetHeight() << FRACBITS);
if (topfrac < 0) topfrac += frontskytex->GetHeight() << FRACBITS;
yl = 0;
yh = (short)MulScale32 ((frontskytex->GetHeight() << FRACBITS) - topfrac, frontyScale);
dc_texturemid = topfrac - iscale * (1-centery);
while (yl < viewheight)
{
for (x = pl->left; x < pl->right; ++x)
{
top[x] = MAX (yl, (short)pl->top[x]);
bot[x] = MIN (yh, (short)pl->bottom[x]);
}
for (x = 0; x < 4; ++x)
{
lastskycol[x] = 0xffffffff;
}
wallscan (pl->left, pl->right, top, bot, swall, lwall, rw_pic->yScale,
backskytex == NULL ? R_GetOneSkyColumn : R_GetTwoSkyColumns);
yl = yh;
yh += drawheight;
dc_texturemid = iscale * (centery-yl-1);
}
centeryfrac = centerysave;
}
//==========================================================================
//
// R_DrawPlanes
//
// At the end of each frame.
//
//==========================================================================
CVAR (Bool, tilt, false, 0);
//CVAR (Int, pa, 0, 0)
int R_DrawPlanes ()
{
visplane_t *pl;
int i;
int vpcount = 0;
ds_color = 3;
for (i = 0; i < MAXVISPLANES; i++)
{
for (pl = visplanes[i]; pl; pl = pl->next)
{
// kg3D - draw only correct planes
if(pl->CurrentPortalUniq != CurrentPortalUniq || pl->CurrentSkybox != CurrentSkybox)
continue;
// kg3D - draw only real planes now
if(pl->sky >= 0) {
vpcount++;
R_DrawSinglePlane (pl, OPAQUE, false, false);
}
}
}
return vpcount;
}
// kg3D - draw all visplanes with "height"
void R_DrawHeightPlanes(fixed_t height)
{
visplane_t *pl;
int i;
ds_color = 3;
fixed_t oViewX = viewx, oViewY = viewy, oViewZ = viewz;
angle_t oViewAngle = viewangle;
for (i = 0; i < MAXVISPLANES; i++)
{
for (pl = visplanes[i]; pl; pl = pl->next)
{
// kg3D - draw only correct planes
if(pl->CurrentSkybox != CurrentSkybox || pl->CurrentPortalUniq != CurrentPortalUniq)
continue;
if(pl->sky < 0 && pl->height.Zat0() == height) {
viewx = pl->viewx;
viewy = pl->viewy;
viewz = pl->viewz;
viewangle = pl->viewangle;
MirrorFlags = pl->MirrorFlags;
R_DrawSinglePlane (pl, pl->sky & 0x7FFFFFFF, pl->Additive, true);
}
}
}
viewx = oViewX;
viewy = oViewY;
viewz = oViewZ;
viewangle = oViewAngle;
}
//==========================================================================
//
// R_DrawSinglePlane
//
// Draws a single visplane.
//
//==========================================================================
void R_DrawSinglePlane (visplane_t *pl, fixed_t alpha, bool additive, bool masked)
{
// pl->angle = pa<<ANGLETOFINESHIFT;
if (pl->left >= pl->right)
return;
if (r_drawflat)
{ // [RH] no texture mapping
ds_color += 4;
R_MapVisPlane (pl, R_MapColoredPlane);
}
else if (pl->picnum == skyflatnum)
{ // sky flat
R_DrawSkyPlane (pl);
}
else
{ // regular flat
FTexture *tex = TexMan(pl->picnum, true);
if (tex->UseType == FTexture::TEX_Null)
{
return;
}
if (!masked && !additive)
{ // If we're not supposed to see through this plane, draw it opaque.
alpha = OPAQUE;
}
else if (!tex->bMasked)
{ // Don't waste time on a masked texture if it isn't really masked.
masked = false;
}
R_SetupSpanBits(tex);
pl->xscale = MulScale16 (pl->xscale, tex->xScale);
pl->yscale = MulScale16 (pl->yscale, tex->yScale);
ds_source = tex->GetPixels ();
basecolormap = pl->colormap;
planeshade = LIGHT2SHADE(pl->lightlevel);
if (r_drawflat || ((pl->height.a == 0 && pl->height.b == 0) && !tilt))
{
R_DrawNormalPlane (pl, alpha, additive, masked);
}
else
{
R_DrawTiltedPlane (pl, alpha, additive, masked);
}
}
NetUpdate ();
}
//==========================================================================
//
// R_DrawSkyBoxes
//
// Draws any recorded sky boxes and then frees them.
//
// The process:
// 1. Move the camera to coincide with the SkyViewpoint.
// 2. Clear out the old planes. (They have already been drawn.)
// 3. Clear a window out of the ClipSegs just large enough for the plane.
// 4. Pretend the existing vissprites and drawsegs aren't there.
// 5. Create a drawseg at 0 distance to clip sprites to the visplane. It
// doesn't need to be associated with a line in the map, since there
// will never be any sprites in front of it.
// 6. Render the BSP, then planes, then masked stuff.
// 7. Restore the previous vissprites and drawsegs.
// 8. Repeat for any other sky boxes.
// 9. Put the camera back where it was to begin with.
//
//==========================================================================
CVAR (Bool, r_skyboxes, true, 0)
static int numskyboxes;
void R_DrawSkyBoxes ()
{
static TArray<size_t> interestingStack;
static TArray<ptrdiff_t> drawsegStack;
static TArray<ptrdiff_t> visspriteStack;
static TArray<fixed_t> viewxStack, viewyStack, viewzStack;
static TArray<visplane_t *> visplaneStack;
numskyboxes = 0;
if (visplanes[MAXVISPLANES] == NULL)
return;
R_3D_EnterSkybox();
CurrentPortalInSkybox = true;
int savedextralight = extralight;
fixed_t savedx = viewx;
fixed_t savedy = viewy;
fixed_t savedz = viewz;
angle_t savedangle = viewangle;
ptrdiff_t savedvissprite_p = vissprite_p - vissprites;
ptrdiff_t savedds_p = ds_p - drawsegs;
ptrdiff_t savedlastopening = lastopening;
size_t savedinteresting = FirstInterestingDrawseg;
float savedvisibility = R_GetVisibility ();
AActor *savedcamera = camera;
sector_t *savedsector = viewsector;
int i;
visplane_t *pl;
for (pl = visplanes[MAXVISPLANES]; pl != NULL; pl = visplanes[MAXVISPLANES])
{
// Pop the visplane off the list now so that if this skybox adds more
// skyboxes to the list, they will be drawn instead of skipped (because
// new skyboxes go to the beginning of the list instead of the end).
visplanes[MAXVISPLANES] = pl->next;
pl->next = NULL;
if (pl->right < pl->left || !r_skyboxes || numskyboxes == MAX_SKYBOX_PLANES)
{
R_DrawSinglePlane (pl, OPAQUE, false, false);
*freehead = pl;
freehead = &pl->next;
continue;
}
numskyboxes++;
ASkyViewpoint *sky = pl->skybox;
ASkyViewpoint *mate = sky->Mate;
if (mate == NULL)
{
// Don't let gun flashes brighten the sky box
extralight = 0;
R_SetVisibility (sky->args[0] * 0.25f);
fixedvec3 viewpos = sky->InterpolatedPosition(r_TicFrac);
viewx = viewpos.x;
viewy = viewpos.y;
viewz = viewpos.z;
viewangle = savedangle + sky->PrevAngle + FixedMul(r_TicFrac, sky->angle - sky->PrevAngle);
R_CopyStackedViewParameters();
}
else
{
extralight = pl->extralight;
R_SetVisibility (pl->visibility);
viewx = pl->viewx - sky->Mate->X() + sky->X();
viewy = pl->viewy - sky->Mate->Y() + sky->Y();
viewz = pl->viewz;
viewangle = pl->viewangle;
}
sky->bInSkybox = true;
if (mate != NULL) mate->bInSkybox = true;
camera = sky;
viewsector = sky->Sector;
R_SetViewAngle ();
validcount++; // Make sure we see all sprites
R_ClearPlanes (false);
R_ClearClipSegs (pl->left, pl->right);
WindowLeft = pl->left;
WindowRight = pl->right;
for (i = pl->left; i < pl->right; i++)
{
if (pl->top[i] == 0x7fff)
{
ceilingclip[i] = viewheight;
floorclip[i] = -1;
}
else
{
ceilingclip[i] = pl->top[i];
floorclip[i] = pl->bottom[i];
}
}
// Create a drawseg to clip sprites to the sky plane
R_CheckDrawSegs ();
ds_p->CurrentPortalUniq = CurrentPortalUniq;
ds_p->siz1 = INT_MAX;
ds_p->siz2 = INT_MAX;
ds_p->sz1 = 0;
ds_p->sz2 = 0;
ds_p->x1 = pl->left;
ds_p->x2 = pl->right;
ds_p->silhouette = SIL_BOTH;
ds_p->sprbottomclip = R_NewOpening (pl->right - pl->left);
ds_p->sprtopclip = R_NewOpening (pl->right - pl->left);
ds_p->maskedtexturecol = ds_p->swall = -1;
ds_p->bFogBoundary = false;
ds_p->curline = NULL;
ds_p->fake = 0;
memcpy (openings + ds_p->sprbottomclip, floorclip + pl->left, (pl->right - pl->left)*sizeof(short));
memcpy (openings + ds_p->sprtopclip, ceilingclip + pl->left, (pl->right - pl->left)*sizeof(short));
firstvissprite = vissprite_p;
firstdrawseg = ds_p++;
FirstInterestingDrawseg = InterestingDrawsegs.Size();
interestingStack.Push (FirstInterestingDrawseg);
ptrdiff_t diffnum = firstdrawseg - drawsegs;
drawsegStack.Push (diffnum);
diffnum = firstvissprite - vissprites;
visspriteStack.Push (diffnum);
viewxStack.Push (viewx);
viewyStack.Push (viewy);
viewzStack.Push (viewz);
visplaneStack.Push (pl);
R_RenderBSPNode (nodes + numnodes - 1);
R_3D_ResetClip(); // reset clips (floor/ceiling)
R_DrawPlanes ();
sky->bInSkybox = false;
if (mate != NULL) mate->bInSkybox = false;
}
// Draw all the masked textures in a second pass, in the reverse order they
// were added. This must be done separately from the previous step for the
// sake of nested skyboxes.
while (interestingStack.Pop (FirstInterestingDrawseg))
{
ptrdiff_t pd = 0;
drawsegStack.Pop (pd);
firstdrawseg = drawsegs + pd;
visspriteStack.Pop (pd);
firstvissprite = vissprites + pd;
viewxStack.Pop (viewx); // Masked textures and planes need the view
viewyStack.Pop (viewy); // coordinates restored for proper positioning.
viewzStack.Pop (viewz);
R_DrawMasked ();
ds_p = firstdrawseg;
vissprite_p = firstvissprite;
visplaneStack.Pop (pl);
if (pl->Alpha > 0)
{
R_DrawSinglePlane (pl, pl->Alpha, pl->Additive, true);
}
*freehead = pl;
freehead = &pl->next;
}
firstvissprite = vissprites;
vissprite_p = vissprites + savedvissprite_p;
firstdrawseg = drawsegs;
ds_p = drawsegs + savedds_p;
InterestingDrawsegs.Resize ((unsigned int)FirstInterestingDrawseg);
FirstInterestingDrawseg = savedinteresting;
lastopening = savedlastopening;
camera = savedcamera;
viewsector = savedsector;
viewx = savedx;
viewy = savedy;
viewz = savedz;
R_SetVisibility (savedvisibility);
extralight = savedextralight;
viewangle = savedangle;
R_SetViewAngle ();
CurrentPortalInSkybox = false;
R_3D_LeaveSkybox();
if(fakeActive) return;
for (*freehead = visplanes[MAXVISPLANES], visplanes[MAXVISPLANES] = NULL; *freehead; )
freehead = &(*freehead)->next;
}
ADD_STAT(skyboxes)
{
FString out;
out.Format ("%d skybox planes", numskyboxes);
return out;
}
//==========================================================================
//
// R_DrawSkyPlane
//
//==========================================================================
void R_DrawSkyPlane (visplane_t *pl)
{
FTextureID sky1tex, sky2tex;
double frontdpos = 0, backdpos = 0;
if ((level.flags & LEVEL_SWAPSKIES) && !(level.flags & LEVEL_DOUBLESKY))
{
sky1tex = sky2texture;
}
else
{
sky1tex = sky1texture;
}
sky2tex = sky2texture;
skymid = skytexturemid;
skyangle = viewangle;
if (pl->picnum == skyflatnum)
{
if (!(pl->sky & PL_SKYFLAT))
{ // use sky1
sky1:
frontskytex = TexMan(sky1tex, true);
if (level.flags & LEVEL_DOUBLESKY)
backskytex = TexMan(sky2tex, true);
else
backskytex = NULL;
skyflip = 0;
frontdpos = sky1pos;
backdpos = sky2pos;
frontcyl = sky1cyl;
backcyl = sky2cyl;
}
else if (pl->sky == PL_SKYFLAT)
{ // use sky2
frontskytex = TexMan(sky2tex, true);
backskytex = NULL;
frontcyl = sky2cyl;
skyflip = 0;
frontdpos = sky2pos;
}
else
{ // MBF's linedef-controlled skies
// Sky Linedef
const line_t *l = &lines[(pl->sky & ~PL_SKYFLAT)-1];
// Sky transferred from first sidedef
const side_t *s = l->sidedef[0];
int pos;
// Texture comes from upper texture of reference sidedef
// [RH] If swapping skies, then use the lower sidedef
if (level.flags & LEVEL_SWAPSKIES && s->GetTexture(side_t::bottom).isValid())
{
pos = side_t::bottom;
}
else
{
pos = side_t::top;
}
frontskytex = TexMan(s->GetTexture(pos), true);
if (frontskytex == NULL || frontskytex->UseType == FTexture::TEX_Null)
{ // [RH] The blank texture: Use normal sky instead.
goto sky1;
}
backskytex = NULL;
// Horizontal offset is turned into an angle offset,
// to allow sky rotation as well as careful positioning.
// However, the offset is scaled very small, so that it
// allows a long-period of sky rotation.
skyangle += s->GetTextureXOffset(pos);
// Vertical offset allows careful sky positioning.
skymid = s->GetTextureYOffset(pos) - 28*FRACUNIT;
// We sometimes flip the picture horizontally.
//
// Doom always flipped the picture, so we make it optional,
// to make it easier to use the new feature, while to still
// allow old sky textures to be used.
skyflip = l->args[2] ? 0u : ~0u;
frontcyl = MAX(frontskytex->GetWidth(), frontskytex->xScale >> (16 - 10));
if (skystretch)
{
skymid = Scale(skymid, frontskytex->GetScaledHeight(), SKYSTRETCH_HEIGHT);
}
}
}
frontpos = int(fmod(frontdpos, sky1cyl * 65536.0));
if (backskytex != NULL)
{
backpos = int(fmod(backdpos, sky2cyl * 65536.0));
}
bool fakefixed = false;
if (fixedcolormap)
{
dc_colormap = fixedcolormap;
}
else
{
fakefixed = true;
fixedcolormap = dc_colormap = NormalLight.Maps;
}
R_DrawSky (pl);
if (fakefixed)
fixedcolormap = NULL;
}
//==========================================================================
//
// R_DrawNormalPlane
//
//==========================================================================
void R_DrawNormalPlane (visplane_t *pl, fixed_t alpha, bool additive, bool masked)
{
#ifdef X86_ASM
if (ds_source != ds_cursource)
{
R_SetSpanSource_ASM (ds_source);
}
#endif
if (alpha <= 0)
{
return;
}
angle_t planeang = pl->angle;
xscale = pl->xscale << (16 - ds_xbits);
yscale = pl->yscale << (16 - ds_ybits);
if (planeang != 0)
{
double rad = ANGLE2RAD(planeang);
double cosine = cos(rad), sine = sin(rad);
pviewx = xs_RoundToInt(pl->xoffs + viewx * cosine - viewy * sine);
pviewy = xs_RoundToInt(pl->yoffs - viewx * sine - viewy * cosine);
}
else
{
pviewx = pl->xoffs + viewx;
pviewy = pl->yoffs - viewy;
}
pviewx = FixedMul (xscale, pviewx);
pviewy = FixedMul (yscale, pviewy);
// left to right mapping
planeang = (viewangle - ANG90 + planeang) >> ANGLETOFINESHIFT;
// Scale will be unit scale at FocalLengthX (normally SCREENWIDTH/2) distance
xstepscale = Scale (xscale, finecosine[planeang], FocalLengthX);
ystepscale = Scale (yscale, -finesine[planeang], FocalLengthX);
// [RH] flip for mirrors
if (MirrorFlags & RF_XFLIP)
{
xstepscale = (DWORD)(-(SDWORD)xstepscale);
ystepscale = (DWORD)(-(SDWORD)ystepscale);
}
int x = pl->right - halfviewwidth - 1;
planeang = (planeang + (ANG90 >> ANGLETOFINESHIFT)) & FINEMASK;
basexfrac = FixedMul (xscale, finecosine[planeang]) + x*xstepscale;
baseyfrac = FixedMul (yscale, -finesine[planeang]) + x*ystepscale;
planeheight = abs (FixedMul (pl->height.d, -pl->height.ic) - viewz);
GlobVis = FixedDiv (r_FloorVisibility, planeheight);
if (fixedlightlev >= 0)
ds_colormap = basecolormap->Maps + fixedlightlev, plane_shade = false;
else if (fixedcolormap)
ds_colormap = fixedcolormap, plane_shade = false;
else
plane_shade = true;
if (spanfunc != R_FillSpan)
{
if (masked)
{
if (alpha < OPAQUE || additive)
{
if (!additive)
{
spanfunc = R_DrawSpanMaskedTranslucent;
dc_srcblend = Col2RGB8[alpha>>10];
dc_destblend = Col2RGB8[(OPAQUE-alpha)>>10];
}
else
{
spanfunc = R_DrawSpanMaskedAddClamp;
dc_srcblend = Col2RGB8_LessPrecision[alpha>>10];
dc_destblend = Col2RGB8_LessPrecision[FRACUNIT>>10];
}
}
else
{
spanfunc = R_DrawSpanMasked;
}
}
else
{
if (alpha < OPAQUE || additive)
{
if (!additive)
{
spanfunc = R_DrawSpanTranslucent;
dc_srcblend = Col2RGB8[alpha>>10];
dc_destblend = Col2RGB8[(OPAQUE-alpha)>>10];
}
else
{
spanfunc = R_DrawSpanAddClamp;
dc_srcblend = Col2RGB8_LessPrecision[alpha>>10];
dc_destblend = Col2RGB8_LessPrecision[FRACUNIT>>10];
}
}
else
{
spanfunc = R_DrawSpan;
}
}
}
R_MapVisPlane (pl, R_MapPlane);
}
//==========================================================================
//
// R_DrawTiltedPlane
//
//==========================================================================
void R_DrawTiltedPlane (visplane_t *pl, fixed_t alpha, bool additive, bool masked)
{
static const float ifloatpow2[16] =
{
// ifloatpow2[i] = 1 / (1 << i)
64.f, 32.f, 16.f, 8.f, 4.f, 2.f, 1.f, 0.5f,
0.25f, 0.125f, 0.0625f, 0.03125f, 0.015625f, 0.0078125f,
0.00390625f, 0.001953125f
/*, 0.0009765625f, 0.00048828125f, 0.000244140625f,
1.220703125e-4f, 6.103515625e-5, 3.0517578125e-5*/
};
double lxscale, lyscale;
double xscale, yscale;
FVector3 p, m, n;
double ang;
double zeroheight;
if (alpha <= 0)
{
return;
}
double vx = FIXED2DBL(viewx);
double vy = FIXED2DBL(viewy);
double vz = FIXED2DBL(viewz);
lxscale = FIXED2DBL(pl->xscale) * ifloatpow2[ds_xbits];
lyscale = FIXED2DBL(pl->yscale) * ifloatpow2[ds_ybits];
xscale = 64.f / lxscale;
yscale = 64.f / lyscale;
zeroheight = pl->height.ZatPoint(vx, vy);
pviewx = MulScale (pl->xoffs, pl->xscale, ds_xbits);
pviewy = MulScale (pl->yoffs, pl->yscale, ds_ybits);
// p is the texture origin in view space
// Don't add in the offsets at this stage, because doing so can result in
// errors if the flat is rotated.
ang = ANGLE2RAD(ANG270 - viewangle);
p[0] = vx * cos(ang) - vy * sin(ang);
p[2] = vx * sin(ang) + vy * cos(ang);
p[1] = pl->height.ZatPoint(0.0, 0.0) - vz;
// m is the v direction vector in view space
ang = ANGLE2RAD(ANG180 - viewangle - pl->angle);
m[0] = yscale * cos(ang);
m[2] = yscale * sin(ang);
// m[1] = FIXED2FLOAT(pl->height.ZatPoint (0, iyscale) - pl->height.ZatPoint (0,0));
// VectorScale2 (m, 64.f/VectorLength(m));
// n is the u direction vector in view space
ang += PI/2;
n[0] = -xscale * cos(ang);
n[2] = -xscale * sin(ang);
// n[1] = FIXED2FLOAT(pl->height.ZatPoint (ixscale, 0) - pl->height.ZatPoint (0,0));
// VectorScale2 (n, 64.f/VectorLength(n));
// This code keeps the texture coordinates constant across the x,y plane no matter
// how much you slope the surface. Use the commented-out code above instead to keep
// the textures a constant size across the surface's plane instead.
ang = ANGLE2RAD(pl->angle);
m[1] = pl->height.ZatPoint(vx + yscale * sin(ang), vy + yscale * cos(ang)) - zeroheight;
ang += PI/2;
n[1] = pl->height.ZatPoint(vx + xscale * sin(ang), vy + xscale * cos(ang)) - zeroheight;
plane_su = p ^ m;
plane_sv = p ^ n;
plane_sz = m ^ n;
plane_su.Z *= FocalLengthXfloat;
plane_sv.Z *= FocalLengthXfloat;
plane_sz.Z *= FocalLengthXfloat;
plane_su.Y *= iyaspectmulfloat;
plane_sv.Y *= iyaspectmulfloat;
plane_sz.Y *= iyaspectmulfloat;
// Premultiply the texture vectors with the scale factors
plane_su *= 4294967296.f;
plane_sv *= 4294967296.f;
if (MirrorFlags & RF_XFLIP)
{
plane_su[0] = -plane_su[0];
plane_sv[0] = -plane_sv[0];
plane_sz[0] = -plane_sz[0];
}
planelightfloat = (r_TiltVisibility * lxscale * lyscale) / (fabs(pl->height.ZatPoint(FIXED2DBL(viewx), FIXED2DBL(viewy)) - FIXED2DBL(viewz))) / 65536.0;
if (pl->height.c > 0)
planelightfloat = -planelightfloat;
if (fixedlightlev >= 0)
ds_colormap = basecolormap->Maps + fixedlightlev, plane_shade = false;
else if (fixedcolormap)
ds_colormap = fixedcolormap, plane_shade = false;
else
ds_colormap = basecolormap->Maps, plane_shade = true;
if (!plane_shade)
{
for (int i = 0; i < viewwidth; ++i)
{
tiltlighting[i] = ds_colormap;
}
}
#if defined(X86_ASM)
if (ds_source != ds_curtiltedsource)
R_SetTiltedSpanSource_ASM (ds_source);
R_MapVisPlane (pl, R_DrawTiltedPlane_ASM);
#else
R_MapVisPlane (pl, R_MapTiltedPlane);
#endif
}
//==========================================================================
//
// R_MapVisPlane
//
// t1/b1 are at x
// t2/b2 are at x+1
// spanend[y] is at the right edge
//
//==========================================================================
void R_MapVisPlane (visplane_t *pl, void (*mapfunc)(int y, int x1))
{
int x = pl->right - 1;
int t2 = pl->top[x];
int b2 = pl->bottom[x];
if (b2 > t2)
{
clearbufshort (spanend+t2, b2-t2, x);
}
for (--x; x >= pl->left; --x)
{
int t1 = pl->top[x];
int b1 = pl->bottom[x];
const int xr = x+1;
int stop;
// Draw any spans that have just closed
stop = MIN (t1, b2);
while (t2 < stop)
{
mapfunc (t2++, xr);
}
stop = MAX (b1, t2);
while (b2 > stop)
{
mapfunc (--b2, xr);
}
// Mark any spans that have just opened
stop = MIN (t2, b1);
while (t1 < stop)
{
spanend[t1++] = x;
}
stop = MAX (b2, t2);
while (b1 > stop)
{
spanend[--b1] = x;
}
t2 = pl->top[x];
b2 = pl->bottom[x];
basexfrac -= xstepscale;
baseyfrac -= ystepscale;
}
// Draw any spans that are still open
while (t2 < b2)
{
mapfunc (--b2, pl->left);
}
}
//==========================================================================
//
// R_PlaneInitData
//
//==========================================================================
bool R_PlaneInitData ()
{
int i;
visplane_t *pl;
// Free all visplanes and let them be re-allocated as needed.
pl = freetail;
while (pl)
{
visplane_t *next = pl->next;
M_Free (pl);
pl = next;
}
freetail = NULL;
freehead = &freetail;
for (i = 0; i < MAXVISPLANES; i++)
{
pl = visplanes[i];
visplanes[i] = NULL;
while (pl)
{
visplane_t *next = pl->next;
M_Free (pl);
pl = next;
}
}
return true;
}
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