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SRB2/src/p_slopes.c

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// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// Copyright(C) 2004 Stephen McGranahan
//
// 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
//
//--------------------------------------------------------------------------
//
// DESCRIPTION:
// Slopes
// SoM created 05/10/09
// ZDoom + Eternity Engine Slopes, ported and enhanced by Kalaron
//
//-----------------------------------------------------------------------------
#include "doomdef.h"
#include "r_defs.h"
#include "r_state.h"
#include "m_bbox.h"
#include "z_zone.h"
#include "p_spec.h"
#include "p_slopes.h"
#include "r_main.h"
#include "p_maputl.h"
#include "w_wad.h"
#ifdef ESLOPE
static pslope_t *dynslopes = NULL;
// Calculate line normal
void P_CalculateSlopeNormal(pslope_t *slope) {
slope->normal.z = FINECOSINE(slope->zangle>>ANGLETOFINESHIFT);
slope->normal.x = -FixedMul(FINESINE(slope->zangle>>ANGLETOFINESHIFT), slope->d.x);
slope->normal.y = -FixedMul(FINESINE(slope->zangle>>ANGLETOFINESHIFT), slope->d.y);
}
// Recalculate dynamic slopes
void P_RunDynamicSlopes(void) {
pslope_t *slope;
for (slope = dynslopes; slope; slope = slope->next) {
fixed_t zdelta;
switch(slope->refpos) {
case 1: // front floor
zdelta = slope->sourceline->backsector->floorheight - slope->sourceline->frontsector->floorheight;
slope->o.z = slope->sourceline->frontsector->floorheight;
break;
case 2: // front ceiling
zdelta = slope->sourceline->backsector->ceilingheight - slope->sourceline->frontsector->ceilingheight;
slope->o.z = slope->sourceline->frontsector->ceilingheight;
break;
case 3: // back floor
zdelta = slope->sourceline->frontsector->floorheight - slope->sourceline->backsector->floorheight;
slope->o.z = slope->sourceline->backsector->floorheight;
break;
case 4: // back ceiling
zdelta = slope->sourceline->frontsector->ceilingheight - slope->sourceline->backsector->ceilingheight;
slope->o.z = slope->sourceline->backsector->ceilingheight;
break;
default:
I_Error("P_RunDynamicSlopes: slope has invalid type!");
}
if (slope->zdelta != FixedDiv(zdelta, slope->extent)) {
slope->zdelta = FixedDiv(zdelta, slope->extent);
slope->zangle = R_PointToAngle2(0, 0, slope->extent, -zdelta);
P_CalculateSlopeNormal(slope);
}
}
}
//
// P_MakeSlope
//
// Alocates and fill the contents of a slope structure.
//
static pslope_t *P_MakeSlope(const vector3_t *o, const vector2_t *d,
const fixed_t zdelta, boolean dynamic)
{
pslope_t *ret = Z_Malloc(sizeof(pslope_t), PU_LEVEL, NULL);
memset(ret, 0, sizeof(*ret));
ret->o.x = o->x;
ret->o.y = o->y;
ret->o.z = o->z;
ret->d.x = d->x;
ret->d.y = d->y;
ret->zdelta = zdelta;
if (dynamic) { // Add to the dynamic slopes list
ret->next = dynslopes;
dynslopes = ret;
}
return ret;
}
//
// P_GetExtent
//
// Returns the distance to the first line within the sector that
// is intersected by a line parallel to the plane normal with the point (ox, oy)
//
static fixed_t P_GetExtent(sector_t *sector, line_t *line)
{
// ZDoom code reference: v3float_t = vertex_t
fixed_t fardist = -FRACUNIT;
size_t i;
// Find furthest vertex from the reference line. It, along with the two ends
// of the line, will define the plane.
// SRB2CBTODO: Use a formula to get the slope to slide objects depending on how steep
for(i = 0; i < sector->linecount; i++)
{
line_t *li = sector->lines[i];
vertex_t tempv;
fixed_t dist;
// Don't compare to the slope line.
if(li == line)
continue;
P_ClosestPointOnLine(li->v1->x, li->v1->y, line, &tempv);
dist = R_PointToDist2(tempv.x, tempv.y, li->v1->x, li->v1->y);
if(dist > fardist)
fardist = dist;
// Okay, maybe do it for v2 as well?
P_ClosestPointOnLine(li->v2->x, li->v2->y, line, &tempv);
dist = R_PointToDist2(tempv.x, tempv.y, li->v2->x, li->v2->y);
if(dist > fardist)
fardist = dist;
}
return fardist;
}
//
// P_SpawnSlope_Line
//
// Creates one or more slopes based on the given line type and front/back
// sectors.
// Kalaron: Check if dynamic slopes need recalculation
//
void P_SpawnSlope_Line(int linenum)
{
// With dynamic slopes, it's fine to just leave this function as normal,
// because checking to see if a slope had changed will waste more memory than
// if the slope was just updated when called
line_t *line = lines + linenum;
INT16 special = line->special;
pslope_t *fslope = NULL, *cslope = NULL;
vector3_t origin, point;
vector2_t direction;
fixed_t nx, ny, dz, extent;
boolean frontfloor = (special == 700 || special == 702 || special == 703);
boolean backfloor = (special == 710 || special == 712 || special == 713);
boolean frontceil = (special == 701 || special == 702 || special == 713);
boolean backceil = (special == 711 || special == 712 || special == 703);
if(!frontfloor && !backfloor && !frontceil && !backceil)
{
CONS_Printf("P_SpawnSlope_Line called with non-slope line special.\n");
return;
}
if(!line->frontsector || !line->backsector)
{
CONS_Printf("P_SpawnSlope_Line used on a line without two sides.\n");
return;
}
{
fixed_t len = R_PointToDist2(0, 0, line->dx, line->dy);
nx = FixedDiv(line->dy, len);
ny = -FixedDiv(line->dx, len);
}
// SRB2CBTODO: Transform origin relative to the bounds of an individual FOF
origin.x = line->v1->x + (line->v2->x - line->v1->x)/2;
origin.y = line->v1->y + (line->v2->y - line->v1->y)/2;
// For FOF slopes, make a special function to copy to the xy origin & direction relative to the position of the FOF on the map!
if(frontfloor || frontceil)
{
line->frontsector->hasslope = true; // Tell the software renderer that we're sloped
origin.z = line->backsector->floorheight;
direction.x = nx;
direction.y = ny;
extent = P_GetExtent(line->frontsector, line);
if(extent < 0)
{
CONS_Printf("P_SpawnSlope_Line failed to get frontsector extent on line number %i\n", linenum);
return;
}
// reposition the origin according to the extent
point.x = origin.x + FixedMul(direction.x, extent);
point.y = origin.y + FixedMul(direction.y, extent);
direction.x = -direction.x;
direction.y = -direction.y;
// TODO: We take origin and point 's xy values and translate them to the center of an FOF!
if(frontfloor)
{
point.z = line->frontsector->floorheight; // Startz
dz = FixedDiv(origin.z - point.z, extent); // Destinationz
// In P_SpawnSlopeLine the origin is the centerpoint of the sourcelinedef
fslope = line->frontsector->f_slope =
P_MakeSlope(&point, &direction, dz, !(line->flags & ML_NOTAILS));
// Set up some shit
fslope->extent = extent;
fslope->refpos = 1;
// Now remember that f_slope IS a vector
// fslope->o = origin 3D point 1 of the vector
// fslope->d = destination 3D point 2 of the vector
// fslope->normal is a 3D line perpendicular to the 3D vector
// Sync the linedata of the line that started this slope
// SRB2CBTODO: Anything special for remote(control sector)-based slopes later?
fslope->sourceline = line;
// To find the real highz/lowz of a slope, you need to check all the vertexes
// in the slope's sector with P_GetZAt to get the REAL lowz & highz
// Although these slopes are set by floorheights the ANGLE is what a slope is,
// so technically any slope can extend on forever (they are just bound by sectors)
// *You can use sourceline as a reference to see if two slopes really are the same
// Default points for high and low
fixed_t highest = point.z > origin.z ? point.z : origin.z;
fixed_t lowest = point.z < origin.z ? point.z : origin.z;
// Now check to see what the REAL high and low points of the slope inside the sector
// TODO: Is this really needed outside of FOFs? -Red
size_t l;
for (l = 0; l < line->frontsector->linecount; l++)
{
fixed_t height = P_GetZAt(line->frontsector->f_slope, line->frontsector->lines[l]->v1->x, line->frontsector->lines[l]->v1->y);
if (height > highest)
highest = height;
if (height < lowest)
lowest = height;
}
// Sets extra clipping data for the frontsector's slope
fslope->highz = highest;
fslope->lowz = lowest;
fslope->zangle = R_PointToAngle2(0, origin.z, extent, point.z);
fslope->xydirection = R_PointToAngle2(origin.x, origin.y, point.x, point.y);
P_CalculateSlopeNormal(fslope);
}
if(frontceil)
{
origin.z = line->backsector->ceilingheight;
point.z = line->frontsector->ceilingheight;
dz = FixedDiv(origin.z - point.z, extent);
cslope = line->frontsector->c_slope =
P_MakeSlope(&point, &direction, dz, !(line->flags & ML_NOTAILS));
// Set up some shit
cslope->extent = extent;
cslope->refpos = 2;
// Sync the linedata of the line that started this slope
// SRB2CBTODO: Anything special for remote(control sector)-based slopes later?
cslope->sourceline = line;
// Remember the way the slope is formed
fixed_t highest = point.z > origin.z ? point.z : origin.z;
fixed_t lowest = point.z < origin.z ? point.z : origin.z;
size_t l;
for (l = 0; l < line->frontsector->linecount; l++)
{
fixed_t height = P_GetZAt(line->frontsector->c_slope, line->frontsector->lines[l]->v1->x, line->frontsector->lines[l]->v1->y);
if (height > highest)
highest = height;
if (height < lowest)
lowest = height;
}
// This line special sets extra clipping data for the frontsector's slope
cslope->highz = highest;
cslope->lowz = lowest;
cslope->zangle = R_PointToAngle2(0, origin.z, extent, point.z);
cslope->xydirection = R_PointToAngle2(origin.x, origin.y, point.x, point.y);
P_CalculateSlopeNormal(cslope);
}
}
if(backfloor || backceil)
{
line->backsector->hasslope = true; // Tell the software renderer that we're sloped
origin.z = line->frontsector->floorheight;
// Backsector
direction.x = -nx;
direction.y = -ny;
extent = P_GetExtent(line->backsector, line);
if(extent < 0)
{
CONS_Printf("P_SpawnSlope_Line failed to get backsector extent on line number %i\n", linenum);
return;
}
// reposition the origin according to the extent
point.x = origin.x + FixedMul(direction.x, extent);
point.y = origin.y + FixedMul(direction.y, extent);
direction.x = -direction.x;
direction.y = -direction.y;
if(backfloor)
{
point.z = line->backsector->floorheight;
dz = FixedDiv(origin.z - point.z, extent);
fslope = line->backsector->f_slope =
P_MakeSlope(&point, &direction, dz, !(line->flags & ML_NOTAILS));
// Set up some shit
fslope->extent = extent;
fslope->refpos = 3;
// Sync the linedata of the line that started this slope
// SRB2CBTODO: Anything special for remote(control sector)-based slopes later?
fslope->sourceline = line;
// Remember the way the slope is formed
fixed_t highest = point.z > origin.z ? point.z : origin.z;
fixed_t lowest = point.z < origin.z ? point.z : origin.z;
size_t l;
for (l = 0; l < line->backsector->linecount; l++)
{
fixed_t height = P_GetZAt(line->backsector->f_slope, line->backsector->lines[l]->v1->x, line->backsector->lines[l]->v1->y);
if (height > highest)
highest = height;
if (height < lowest)
lowest = height;
}
// This line special sets extra clipping data for the frontsector's slope
fslope->highz = highest;
fslope->lowz = lowest;
fslope->zangle = R_PointToAngle2(0, origin.z, extent, point.z);
fslope->xydirection = R_PointToAngle2(origin.x, origin.y, point.x, point.y);
P_CalculateSlopeNormal(fslope);
}
if(backceil)
{
origin.z = line->frontsector->ceilingheight;
point.z = line->backsector->ceilingheight;
dz = FixedDiv(origin.z - point.z, extent);
cslope = line->backsector->c_slope =
P_MakeSlope(&point, &direction, dz, !(line->flags & ML_NOTAILS));
// Set up some shit
cslope->extent = extent;
cslope->refpos = 4;
// Sync the linedata of the line that started this slope
// SRB2CBTODO: Anything special for remote(control sector)-based slopes later?
cslope->sourceline = line;
// Remember the way the slope is formed
fixed_t highest = point.z > origin.z ? point.z : origin.z;
fixed_t lowest = point.z < origin.z ? point.z : origin.z;
size_t l;
for (l = 0; l < line->backsector->linecount; l++)
{
fixed_t height = P_GetZAt(line->backsector->c_slope, line->backsector->lines[l]->v1->x, line->backsector->lines[l]->v1->y);
if (height > highest)
highest = height;
if (height < lowest)
lowest = height;
}
// This line special sets extra clipping data for the backsector's slope
cslope->highz = highest;
cslope->lowz = lowest;
cslope->zangle = R_PointToAngle2(0, origin.z, extent, point.z);
cslope->xydirection = R_PointToAngle2(origin.x, origin.y, point.x, point.y);
P_CalculateSlopeNormal(cslope);
}
}
if(!line->tag)
return;
}
//
// P_CopySectorSlope
//
// Searches through tagged sectors and copies
//
void P_CopySectorSlope(line_t *line)
{
sector_t *fsec = line->frontsector;
int i, special = line->special;
// Check for copy linedefs
for(i = -1; (i = P_FindSectorFromLineTag(line, i)) >= 0;)
{
sector_t *srcsec = sectors + i;
if((special - 719) & 1 && !fsec->f_slope && srcsec->f_slope)
fsec->f_slope = srcsec->f_slope; //P_CopySlope(srcsec->f_slope);
if((special - 719) & 2 && !fsec->c_slope && srcsec->c_slope)
fsec->c_slope = srcsec->c_slope; //P_CopySlope(srcsec->c_slope);
}
fsec->hasslope = true;
line->special = 0; // Linedef was use to set slopes, it finished its job, so now make it a normal linedef
}
#ifdef SPRINGCLEAN
#include "byteptr.h"
#include "p_setup.h"
#include "p_local.h"
//==========================================================================
//
// P_SetSlopesFromVertexHeights
//
//==========================================================================
void P_SetSlopesFromVertexHeights(lumpnum_t lumpnum)
{
mapthing_t *mt;
boolean vt_found = false;
size_t i, j, k, l, q;
//size_t i;
//mapthing_t *mt;
char *data;
char *datastart;
// SRB2CBTODO: WHAT IS (5 * sizeof (short))?! It = 10
// anything else seems to make a map not load properly,
// but this hard-coded value MUST have some reason for being what it is
size_t snummapthings = W_LumpLength(lumpnum) / (5 * sizeof (short));
mapthing_t *smapthings = Z_Calloc(snummapthings * sizeof (*smapthings), PU_LEVEL, NULL);
fixed_t x, y;
sector_t *sector;
// Spawn axis points first so they are
// at the front of the list for fast searching.
data = datastart = W_CacheLumpNum(lumpnum, PU_LEVEL);
mt = smapthings;
for (i = 0; i < snummapthings; i++, mt++)
{
mt->x = READINT16(data);
mt->y = READINT16(data);
mt->angle = READINT16(data);
mt->type = READINT16(data);
mt->options = READINT16(data);
// mt->z hasn't been set yet!
//mt->extrainfo = (byte)(mt->type >> 12); // slope things are special, they have a bigger range of types
//mt->type &= 4095; // SRB2CBTODO: WHAT IS THIS???? Mobj type limits?!!!!
x = mt->x*FRACUNIT;
y = mt->y*FRACUNIT;
sector = R_PointInSubsector(x, y)->sector;
// Z for objects
#ifdef ESLOPE
if (sector->f_slope)
mt->z = (short)(P_GetZAt(sector->f_slope, x, y)>>FRACBITS);
else
#endif
mt->z = (short)(sector->floorheight>>FRACBITS);
mt->z = mt->z + (mt->options >> ZSHIFT);
if (mt->type == THING_VertexFloorZ || mt->type == THING_VertexCeilingZ) // THING_VertexFloorZ
{
for(l = 0; l < numvertexes; l++)
{
if (vertexes[l].x == mt->x*FRACUNIT && vertexes[l].y == mt->y*FRACUNIT)
{
if (mt->type == THING_VertexFloorZ)
{
vertexes[l].z = mt->z*FRACUNIT;
//I_Error("Z value: %i", vertexes[l].z/FRACUNIT);
}
else
{
vertexes[l].z = mt->z*FRACUNIT; // celing floor
}
vt_found = true;
}
}
//mt->type = 0; // VPHYSICS: Dynamic slopes
if (vt_found)
{
for (k = 0; k < numsectors; k++)
{
sector_t *sec = &sectors[k];
if (sec->linecount != 3) continue; // only works with triangular sectors
v3float_t vt1, vt2, vt3; // cross = ret->normalf
v3float_t vec1, vec2;
int vi1, vi2, vi3;
vi1 = (int)(sec->lines[0]->v1 - vertexes);
vi2 = (int)(sec->lines[0]->v2 - vertexes);
vi3 = (sec->lines[1]->v1 == sec->lines[0]->v1 || sec->lines[1]->v1 == sec->lines[0]->v2)?
(int)(sec->lines[1]->v2 - vertexes) : (int)(sec->lines[1]->v1 - vertexes);
//if (vertexes[vi1].z)
// I_Error("OSNAP %i", vertexes[vi1].z/FRACUNIT);
//if (vertexes[vi2].z)
// I_Error("OSNAP %i", vertexes[vi2].z/FRACUNIT);
//if (vertexes[vi3].z)
// I_Error("OSNAP %i", vertexes[vi3].z/FRACUNIT);
//I_Error("%i, %i", mt->z*FRACUNIT, vertexes[vi1].z);
//I_Error("%i, %i, %i", mt->x, mt->y, mt->z);
//P_SpawnMobj(mt->x*FRACUNIT, mt->y*FRACUNIT, mt->z*FRACUNIT, MT_RING);
// TODO: Make sure not to spawn in the same place 2x! (we need an object in every vertex of the
// triangle sector to setup the real vertex slopes
// Check for the vertexes of all sectors
for(q = 0; q < numvertexes; q++)
{
if (vertexes[q].x == mt->x*FRACUNIT && vertexes[q].y == mt->y*FRACUNIT)
{
//I_Error("yeah %i", vertexes[q].z);
P_SpawnMobj(vertexes[q].x, vertexes[q].y, vertexes[q].z, MT_RING);
#if 0
if ((mt->y*FRACUNIT == vertexes[vi1].y && mt->x*FRACUNIT == vertexes[vi1].x && mt->z*FRACUNIT == vertexes[vi1].z)
&& !(mt->y*FRACUNIT == vertexes[vi2].y && mt->x*FRACUNIT == vertexes[vi2].x && mt->z*FRACUNIT == vertexes[vi2].z)
&& !(mt->y*FRACUNIT == vertexes[vi3].y && mt->x*FRACUNIT == vertexes[vi3].x && mt->z*FRACUNIT == vertexes[vi3].z))
P_SpawnMobj(vertexes[vi1].x, vertexes[vi1].y, vertexes[vi1].z, MT_RING);
else if ((mt->y*FRACUNIT == vertexes[vi2].y && mt->x*FRACUNIT == vertexes[vi2].x && mt->z*FRACUNIT == vertexes[vi2].z)
&& !(mt->y*FRACUNIT == vertexes[vi1].y && mt->x*FRACUNIT == vertexes[vi1].x && mt->z*FRACUNIT == vertexes[vi1].z)
&& !(mt->y*FRACUNIT == vertexes[vi3].y && mt->x*FRACUNIT == vertexes[vi3].x && mt->z*FRACUNIT == vertexes[vi3].z))
P_SpawnMobj(vertexes[vi2].x, vertexes[vi2].y, vertexes[vi2].z, MT_BOUNCETV);
else if ((mt->y*FRACUNIT == vertexes[vi3].y && mt->x*FRACUNIT == vertexes[vi3].x && mt->z*FRACUNIT == vertexes[vi3].z)
&& !(mt->y*FRACUNIT == vertexes[vi2].y && mt->x*FRACUNIT == vertexes[vi2].x && mt->z*FRACUNIT == vertexes[vi2].z)
&& !(mt->y*FRACUNIT == vertexes[vi1].y && mt->x*FRACUNIT == vertexes[vi1].x && mt->z*FRACUNIT == vertexes[vi1].z))
P_SpawnMobj(vertexes[vi3].x, vertexes[vi3].y, vertexes[vi3].z, MT_GFZFLOWER1);
else
#endif
continue;
}
}
vt1.x = FIXED_TO_FLOAT(vertexes[vi1].x);
vt1.y = FIXED_TO_FLOAT(vertexes[vi1].y);
vt2.x = FIXED_TO_FLOAT(vertexes[vi2].x);
vt2.y = FIXED_TO_FLOAT(vertexes[vi2].y);
vt3.x = FIXED_TO_FLOAT(vertexes[vi3].x);
vt3.y = FIXED_TO_FLOAT(vertexes[vi3].y);
for(j = 0; j < 2; j++)
{
fixed_t z3;
//I_Error("Lo hicimos");
vt1.z = mt->z;//FIXED_TO_FLOAT(j==0 ? sec->floorheight : sec->ceilingheight);
vt2.z = mt->z;//FIXED_TO_FLOAT(j==0? sec->floorheight : sec->ceilingheight);
z3 = mt->z;//j==0? sec->floorheight : sec->ceilingheight; // Destination height
vt3.z = FIXED_TO_FLOAT(z3);
if (P_PointOnLineSide(vertexes[vi3].x, vertexes[vi3].y, sec->lines[0]) == 0)
{
vec1.x = vt2.x - vt3.x;
vec1.y = vt2.y - vt3.y;
vec1.z = vt2.z - vt3.z;
vec2.x = vt1.x - vt3.x;
vec2.y = vt1.y - vt3.y;
vec2.z = vt1.z - vt3.z;
}
else
{
vec1.x = vt1.x - vt3.x;
vec1.y = vt1.y - vt3.y;
vec1.z = vt1.z - vt3.z;
vec2.x = vt2.x - vt3.x;
vec2.y = vt2.y - vt3.y;
vec2.z = vt2.z - vt3.z;
}
pslope_t *ret = Z_Malloc(sizeof(pslope_t), PU_LEVEL, NULL);
memset(ret, 0, sizeof(*ret));
{
M_CrossProduct3f(&ret->normalf, &vec1, &vec2);
// Cross product length
float len = (float)sqrt(ret->normalf.x * ret->normalf.x +
ret->normalf.y * ret->normalf.y +
ret->normalf.z * ret->normalf.z);
if (len == 0)
{
// Only happens when all vertices in this sector are on the same line.
// Let's just ignore this case.
//CONS_Printf("Slope thing at (%d,%d) lies directly on its target line.\n", (int)(x>>16), (int)(y>>16));
return;
}
// cross/len
ret->normalf.x /= len;
ret->normalf.y /= len;
ret->normalf.z /= len;
// ZDoom cross = ret->normalf
// Fix backward normals
if ((ret->normalf.z < 0 && j == 0) || (ret->normalf.z > 0 && j == 1))
{
// cross = -cross
ret->normalf.x = -ret->normalf.x;
ret->normalf.y = -ret->normalf.x;
ret->normalf.z = -ret->normalf.x;
}
}
secplane_t *srcplane = Z_Calloc(sizeof(*srcplane), PU_LEVEL, NULL);
srcplane->a = FLOAT_TO_FIXED (ret->normalf.x);
srcplane->b = FLOAT_TO_FIXED (ret->normalf.y);
srcplane->c = FLOAT_TO_FIXED (ret->normalf.z);
//srcplane->ic = FixedDiv(FRACUNIT, srcplane->c);
srcplane->d = -TMulScale16 (srcplane->a, vertexes[vi3].x,
srcplane->b, vertexes[vi3].y,
srcplane->c, z3);
if (j == 0)
{
sec->f_slope = ret;
sec->f_slope->secplane = *srcplane;
}
else if (j == 1)
{
sec->c_slope = ret;
sec->c_slope->secplane = *srcplane;
}
}
}
}
}
}
Z_Free(datastart);
}
#endif
// Reset the dynamic slopes pointer, and read all of the fancy schmancy slopes
void P_ResetDynamicSlopes(void) {
size_t i;
#if 1 // Rewrite old specials to new ones, and give a console warning
boolean warned = false;
#endif
dynslopes = NULL;
// We'll handle copy slopes later, after all the tag lists have been made.
// Yes, this means copied slopes won't affect things' spawning heights. Too bad for you.
for (i = 0; i < numlines; i++)
{
switch (lines[i].special)
{
#if 1 // Rewrite old specials to new ones, and give a console warning
#define WARNME if (!warned) {warned = true; CONS_Alert(CONS_WARNING, "This level uses old slope specials.\nA conversion will be needed before 2.2's release.\n");}
case 386:
case 387:
case 388:
lines[i].special += 700-386;
WARNME
P_SpawnSlope_Line(i);
break;
case 389:
case 390:
case 391:
case 392:
lines[i].special += 710-389;
WARNME
P_SpawnSlope_Line(i);
break;
case 393:
lines[i].special = 703;
WARNME
P_SpawnSlope_Line(i);
break;
case 394:
case 395:
case 396:
lines[i].special += 720-394;
WARNME
break;
#endif
case 700:
case 701:
case 702:
case 703:
case 710:
case 711:
case 712:
case 713:
P_SpawnSlope_Line(i);
break;
default:
break;
}
}
}
// ============================================================================
//
// Various utilities related to slopes
//
//
// P_GetZAt
//
// Returns the height of the sloped plane at (x, y) as a fixed_t
//
fixed_t P_GetZAt(pslope_t *slope, fixed_t x, fixed_t y)
{
fixed_t dist = FixedMul(x - slope->o.x, slope->d.x) +
FixedMul(y - slope->o.y, slope->d.y);
return slope->o.z + FixedMul(dist, slope->zdelta);
}
//
// P_QuantizeMomentumToSlope
//
// When given a vector, rotates it and aligns it to a slope
void P_QuantizeMomentumToSlope(vector3_t *momentum, pslope_t *slope)
{
vector3_t axis;
axis.x = -slope->d.y;
axis.y = slope->d.x;
axis.z = 0;
FV3_Rotate(momentum, &axis, slope->zangle >> ANGLETOFINESHIFT);
}
//
// P_SlopeLaunch
//
// Handles slope ejection for objects
void P_SlopeLaunch(mobj_t *mo)
{
// Double the pre-rotation Z, then halve the post-rotation Z. This reduces the
// vertical launch given from slopes while increasing the horizontal launch
// given. Good for SRB2's gravity and horizontal speeds.
vector3_t slopemom;
slopemom.x = mo->momx;
slopemom.y = mo->momy;
slopemom.z = mo->momz*2;
P_QuantizeMomentumToSlope(&slopemom, mo->standingslope);
mo->momx = slopemom.x;
mo->momy = slopemom.y;
mo->momz = slopemom.z/2;
//CONS_Printf("Launched off of slope.\n");
mo->standingslope = NULL;
}
// Function to help handle landing on slopes
void P_HandleSlopeLanding(mobj_t *thing, pslope_t *slope)
{
vector3_t mom;
mom.x = thing->momx;
mom.y = thing->momy;
mom.z = thing->momz*2;
//CONS_Printf("langing on slope\n");
// Reverse quantizing might could use its own function later
slope->zangle = ANGLE_MAX-slope->zangle;
P_QuantizeMomentumToSlope(&mom, slope);
slope->zangle = ANGLE_MAX-slope->zangle;
if (P_MobjFlip(thing)*mom.z < 0) { // falling, land on slope
thing->momx = mom.x;
thing->momy = mom.y;
thing->momz = -P_MobjFlip(thing);
thing->standingslope = slope;
}
}
// https://yourlogicalfallacyis.com/slippery-slope
// Handles sliding down slopes, like if they were made of butter :)
void P_ButteredSlope(mobj_t *mo)
{
fixed_t thrust;
if (!mo->standingslope)
return;
if (mo->player) {
if (abs(mo->standingslope->zdelta) < FRACUNIT/4 && !(mo->player->pflags & PF_SPINNING))
return; // Don't slide on non-steep slopes unless spinning
if (abs(mo->standingslope->zdelta) < FRACUNIT/2 && !(mo->player->rmomx || mo->player->rmomy))
return; // Allow the player to stand still on slopes below a certain steepness
}
thrust = FINESINE(mo->standingslope->zangle>>ANGLETOFINESHIFT) * 3 / 2 * (mo->eflags & MFE_VERTICALFLIP ? 1 : -1);
if (mo->player && (mo->player->pflags & PF_SPINNING)) {
fixed_t mult = 0;
if (mo->momx || mo->momy) {
angle_t angle = R_PointToAngle2(0, 0, mo->momx, mo->momy) - mo->standingslope->xydirection;
if (P_MobjFlip(mo) * mo->standingslope->zdelta < 0)
angle ^= ANGLE_180;
mult = FINECOSINE(angle >> ANGLETOFINESHIFT);
}
//CONS_Printf("%d\n", mult);
thrust = FixedMul(thrust, FRACUNIT*2/3 + mult/8);
}
if (mo->momx || mo->momy) // Slightly increase thrust based on the object's speed
thrust = FixedMul(thrust, FRACUNIT+P_AproxDistance(mo->momx, mo->momy)/16);
// This makes it harder to zigzag up steep slopes, as well as allows greater top speed when rolling down
// Multiply by gravity
thrust = FixedMul(thrust, FRACUNIT/2); // TODO actually get this
P_Thrust(mo, mo->standingslope->xydirection, thrust);
}
// EOF
#endif // #ifdef ESLOPE
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