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UltimateZoneBuilder/Source/Plugins/BuilderModes/VisualModes/VisualMiddleDouble.cs
biwa 28630b9777 Game Configurations: added texture skewing options to the GZDoom game configurations 
Visual Mode: added support for GZDoom style texture skewing
2023-11-04 21:43:09 +01:00

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#region ================== Copyright (c) 2007 Pascal vd Heiden
/*
* Copyright (c) 2007 Pascal vd Heiden, www.codeimp.com
* This program is released under GNU General Public License
*
* 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.
*
*/
#endregion
#region ================== Namespaces
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using CodeImp.DoomBuilder.Map;
using CodeImp.DoomBuilder.Geometry;
using CodeImp.DoomBuilder.Rendering;
using CodeImp.DoomBuilder.Types;
using CodeImp.DoomBuilder.VisualModes;
using CodeImp.DoomBuilder.Data;
#endregion
namespace CodeImp.DoomBuilder.BuilderModes
{
internal sealed class VisualMiddleDouble : BaseVisualGeometrySidedef
{
#region ================== Constants
#endregion
#region ================== Variables
private bool repeatmidtex;
private Plane topclipplane;
private Plane bottomclipplane;
#endregion
#region ================== Properties
#endregion
#region ================== Constructor / Setup
// Constructor
public VisualMiddleDouble(BaseVisualMode mode, VisualSector vs, Sidedef s) : base(mode, vs, s)
{
//mxd
geometrytype = VisualGeometryType.WALL_MIDDLE;
partname = "mid";
// Set render pass
this.RenderPass = RenderPass.Mask;
// We have no destructor
GC.SuppressFinalize(this);
}
// This builds the geometry. Returns false when no geometry created.
public override bool Setup()
{
//mxd
if(Sidedef.LongMiddleTexture == MapSet.EmptyLongName)
{
base.SetVertices(null);
return false;
}
Vector2D vl, vr;
//mxd. lightfog flag support
int lightvalue;
bool lightabsolute;
GetLightValue(out lightvalue, out lightabsolute);
Vector2D tscale = new Vector2D(Sidedef.Fields.GetValue("scalex_mid", 1.0),
Sidedef.Fields.GetValue("scaley_mid", 1.0));
Vector2D tscaleAbs = new Vector2D(Math.Abs(tscale.x), Math.Abs(tscale.y));
Vector2D toffset = new Vector2D(Sidedef.Fields.GetValue("offsetx_mid", 0.0),
Sidedef.Fields.GetValue("offsety_mid", 0.0));
// Left and right vertices for this sidedef
if(Sidedef.IsFront)
{
vl = new Vector2D(Sidedef.Line.Start.Position.x, Sidedef.Line.Start.Position.y);
vr = new Vector2D(Sidedef.Line.End.Position.x, Sidedef.Line.End.Position.y);
}
else
{
vl = new Vector2D(Sidedef.Line.End.Position.x, Sidedef.Line.End.Position.y);
vr = new Vector2D(Sidedef.Line.Start.Position.x, Sidedef.Line.Start.Position.y);
}
// Load sector data
SectorData sd = mode.GetSectorData(Sidedef.Sector);
SectorData osd = mode.GetSectorData(Sidedef.Other.Sector);
if(!osd.Updated) osd.Update();
// Load texture
if(Sidedef.LongMiddleTexture != MapSet.EmptyLongName)
{
base.Texture = General.Map.Data.GetTextureImage(Sidedef.LongMiddleTexture);
if(base.Texture == null || base.Texture is UnknownImage)
{
base.Texture = General.Map.Data.UnknownTexture3D;
setuponloadedtexture = Sidedef.LongMiddleTexture;
}
else if(!base.Texture.IsImageLoaded)
{
setuponloadedtexture = Sidedef.LongMiddleTexture;
}
}
else
{
// Use missing texture
base.Texture = General.Map.Data.MissingTexture3D;
setuponloadedtexture = 0;
}
// Get texture scaled size. Round up, because that's apparently what GZDoom does
Vector2D tsz = new Vector2D(Math.Ceiling(base.Texture.ScaledWidth / tscale.x), Math.Ceiling(base.Texture.ScaledHeight / tscale.y));
// Get texture offsets
Vector2D tof = new Vector2D(Sidedef.OffsetX, Sidedef.OffsetY);
tof = tof + toffset;
// biwa. Also take the ForceWorldPanning MAPINFO entry into account
if (General.Map.Config.ScaledTextureOffsets && (!base.Texture.WorldPanning && !General.Map.Data.MapInfo.ForceWorldPanning))
{
tof = tof / tscaleAbs;
tof = tof * base.Texture.Scale;
// If the texture gets replaced with a "hires" texture it adds more fuckery
if (base.Texture is HiResImage)
tof *= tscaleAbs;
// Round up, since that's apparently what GZDoom does. Not sure if this is the right place or if it also has to be done earlier
tof = new Vector2D(Math.Ceiling(tof.x), Math.Ceiling(tof.y));
}
// Determine texture coordinates plane as they would be in normal circumstances.
// We can then use this plane to find any texture coordinate we need.
// The logic here is the same as in the original VisualMiddleSingle (except that
// the values are stored in a TexturePlane)
// NOTE: I use a small bias for the floor height, because if the difference in
// height is 0 then the TexturePlane doesn't work!
TexturePlane tp = new TexturePlane();
double floorbias = (Sidedef.Sector.CeilHeight == Sidedef.Sector.FloorHeight) ? 1.0 : 0.0;
double geotop = Math.Min(Sidedef.Sector.CeilHeight, Sidedef.Other.Sector.CeilHeight);
double geobottom = Math.Max(Sidedef.Sector.FloorHeight, Sidedef.Other.Sector.FloorHeight);
double zoffset = Sidedef.Sector.CeilHeight - Sidedef.Other.Sector.CeilHeight; //mxd
// When lower unpegged is set, the middle texture is bound to the bottom
if(Sidedef.Line.IsFlagSet(General.Map.Config.LowerUnpeggedFlag))
tp.tlt.y = tsz.y - (geotop - geobottom);
if(zoffset > 0) tp.tlt.y -= zoffset; //mxd
tp.trb.x = tp.tlt.x + Math.Round(Sidedef.Line.Length); //mxd. (G)ZDoom snaps texture coordinates to integral linedef length
tp.trb.y = tp.tlt.y + (Sidedef.Sector.CeilHeight - (Sidedef.Sector.FloorHeight + floorbias));
// Apply texture offset
tp.tlt += tof;
tp.trb += tof;
// Transform pixel coordinates to texture coordinates
tp.tlt /= tsz;
tp.trb /= tsz;
// Left top and right bottom of the geometry that
tp.vlt = new Vector3D(vl.x, vl.y, Sidedef.Sector.CeilHeight);
tp.vrb = new Vector3D(vr.x, vr.y, Sidedef.Sector.FloorHeight + floorbias);
// Make the right-top coordinates
tp.trt = new Vector2D(tp.trb.x, tp.tlt.y);
tp.vrt = new Vector3D(tp.vrb.x, tp.vrb.y, tp.vlt.z);
// Keep top and bottom planes for intersection testing
top = sd.Ceiling.plane;
bottom = sd.Floor.plane;
// Create initial polygon, which is just a quad between floor and ceiling
WallPolygon poly = new WallPolygon();
poly.Add(new Vector3D(vl.x, vl.y, sd.Floor.plane.GetZ(vl)));
poly.Add(new Vector3D(vl.x, vl.y, sd.Ceiling.plane.GetZ(vl)));
poly.Add(new Vector3D(vr.x, vr.y, sd.Ceiling.plane.GetZ(vr)));
poly.Add(new Vector3D(vr.x, vr.y, sd.Floor.plane.GetZ(vr)));
// Determine initial color
int lightlevel = lightabsolute ? lightvalue : sd.Ceiling.brightnessbelow + lightvalue;
//mxd. This calculates light with doom-style wall shading
PixelColor wallbrightness = PixelColor.FromInt(mode.CalculateBrightness(lightlevel, Sidedef));
PixelColor wallcolor = PixelColor.Modulate(sd.Ceiling.colorbelow, wallbrightness);
fogfactor = CalculateFogFactor(lightlevel);
poly.color = wallcolor.WithAlpha(255).ToInt();
// Cut off the part below the other floor and above the other ceiling
CropPoly(ref poly, osd.Ceiling.plane, true);
CropPoly(ref poly, osd.Floor.plane, true);
// Determine if we should repeat the middle texture. In UDMF this is done with a flag, in Hexen with
// a argument to the 121:Line_SetIdentification. See https://www.zdoom.org/w/index.php?title=Line_SetIdentification
if (General.Map.UDMF)
repeatmidtex = Sidedef.IsFlagSet("wrapmidtex") || Sidedef.Line.IsFlagSet("wrapmidtex"); //mxd
else if (General.Map.HEXEN)
repeatmidtex = Sidedef.Line.Action == 121 && (Sidedef.Line.Args[1] & 16) == 16;
else
repeatmidtex = false;
if(!repeatmidtex)
{
// First determine the visible portion of the texture
double textop;
// Determine top portion height
if(Sidedef.Line.IsFlagSet(General.Map.Config.LowerUnpeggedFlag))
textop = geobottom + tof.y + Math.Abs(tsz.y);
else
textop = geotop + tof.y;
// Calculate bottom portion height
double texbottom = textop - Math.Abs(tsz.y);
// Create crop planes (we also need these for intersection testing)
if (General.Map.Config.SidedefTextureSkewing)
{
(topclipplane, bottomclipplane) = CreateSkewClipPlanes(textop, texbottom, sd, osd);
}
else
{
topclipplane = new Plane(new Vector3D(0, 0, -1), textop);
bottomclipplane = new Plane(new Vector3D(0, 0, 1), -texbottom);
}
// Crop polygon by these heights
CropPoly(ref poly, topclipplane, true);
CropPoly(ref poly, bottomclipplane, true);
}
//mxd. In(G)ZDoom, middle sidedef parts are not clipped by extrafloors of any type...
List<WallPolygon> polygons = new List<WallPolygon> { poly };
//ClipExtraFloors(polygons, sd.ExtraFloors, true); //mxd
//ClipExtraFloors(polygons, osd.ExtraFloors, true); //mxd
//if(polygons.Count > 0)
//{
// Keep top and bottom planes for intersection testing
top = osd.Ceiling.plane;
bottom = osd.Floor.plane;
// Process the polygon and create vertices
List<WorldVertex> verts = CreatePolygonVertices(polygons, tp, sd, lightvalue, lightabsolute);
if(verts.Count > 2)
{
// Apply alpha to vertices
byte alpha = SetLinedefRenderstyle(true);
if(alpha < 255)
{
for(int i = 0; i < verts.Count; i++)
{
WorldVertex v = verts[i];
v.c = PixelColor.FromInt(v.c).WithAlpha(alpha).ToInt();
verts[i] = v;
}
}
base.SetVertices(verts);
// Set skewing
UpdateSkew();
return true;
}
//}
base.SetVertices(null); //mxd
return false;
}
#endregion
#region ================== Methods
// This performs a fast test in object picking
public override bool PickFastReject(Vector3D from, Vector3D to, Vector3D dir)
{
if(!repeatmidtex)
{
// When the texture is not repeated, leave when outside crop planes
if((pickintersect.z < bottomclipplane.GetZ(pickintersect)) ||
(pickintersect.z > topclipplane.GetZ(pickintersect)))
return false;
}
return base.PickFastReject(from, to, dir);
}
//mxd. Alpha based picking
public override bool PickAccurate(Vector3D from, Vector3D to, Vector3D dir, ref double u_ray)
{
if(!BuilderPlug.Me.AlphaBasedTextureHighlighting || !Texture.IsImageLoaded || (!Texture.IsTranslucent && !Texture.IsMasked)) return base.PickAccurate(from, to, dir, ref u_ray);
double u;
new Line2D(from, to).GetIntersection(Sidedef.Line.Line, out u);
if(Sidedef != Sidedef.Line.Front) u = 1.0f - u;
// Some textures (e.g. HiResImage) may lie about their size, so use bitmap size instead
int imageWidth = Texture.GetAlphaTestWidth();
int imageHeight = Texture.GetAlphaTestHeight();
// Determine texture scale...
Vector2D imgscale = new Vector2D((double)Texture.Width / imageWidth, (double)Texture.Height / imageHeight);
Vector2D texscale = (Texture is HiResImage) ? imgscale * Texture.Scale : Texture.Scale;
// Get correct offset to texture space...
int ox = (int)Math.Floor((u * Sidedef.Line.Length * UniFields.GetFloat(Sidedef.Fields, "scalex_mid", 1.0f) / texscale.x
+ ((Sidedef.OffsetX + UniFields.GetFloat(Sidedef.Fields, "offsetx_mid")) / imgscale.x))
% imageWidth);
int oy;
if (repeatmidtex)
{
bool pegbottom = Sidedef.Line.IsFlagSet(General.Map.Config.LowerUnpeggedFlag);
double zoffset = (pegbottom ? Sidedef.Sector.FloorHeight : Sidedef.Sector.CeilHeight);
oy = (int)Math.Floor(((pickintersect.z - zoffset) * UniFields.GetFloat(Sidedef.Fields, "scaley_mid", 1.0f) / texscale.y
- ((Sidedef.OffsetY - UniFields.GetFloat(Sidedef.Fields, "offsety_mid")) / imgscale.y))
% imageHeight);
}
else
{
double zoffset = bottomclipplane.GetZ(pickintersect);
oy = (int)Math.Ceiling(((pickintersect.z - zoffset) * UniFields.GetFloat(Sidedef.Fields, "scaley_mid", 1.0f) / texscale.y) % imageHeight);
}
// Make sure offsets are inside of texture dimensions...
if (ox < 0) ox += imageWidth;
if (oy < 0) oy += imageHeight;
// Check pixel alpha
Point pixelpos = new Point(General.Clamp(ox, 0, imageWidth - 1), General.Clamp(imageHeight - oy, 0, imageHeight - 1));
return (Texture.AlphaTestPixel(pixelpos.X, pixelpos.Y) && base.PickAccurate(from, to, dir, ref u_ray));
}
// Return texture name
public override string GetTextureName()
{
return this.Sidedef.MiddleTexture;
}
// This changes the texture
protected override void SetTexture(string texturename)
{
this.Sidedef.SetTextureMid(texturename);
General.Map.Data.UpdateUsedTextures();
this.Setup();
}
protected override void SetTextureOffsetX(int x)
{
Sidedef.Fields.BeforeFieldsChange();
Sidedef.Fields["offsetx_mid"] = new UniValue(UniversalType.Float, (double)x);
}
protected override void SetTextureOffsetY(int y)
{
Sidedef.Fields.BeforeFieldsChange();
Sidedef.Fields["offsety_mid"] = new UniValue(UniversalType.Float, (double)y);
}
protected override void MoveTextureOffset(int offsetx, int offsety)
{
Sidedef.Fields.BeforeFieldsChange();
bool worldpanning = this.Texture.WorldPanning || General.Map.Data.MapInfo.ForceWorldPanning;
double oldx = Sidedef.Fields.GetValue("offsetx_mid", 0.0);
double oldy = Sidedef.Fields.GetValue("offsety_mid", 0.0);
double scalex = Sidedef.Fields.GetValue("scalex_mid", 1.0);
double scaley = Sidedef.Fields.GetValue("scaley_mid", 1.0);
bool textureloaded = (Texture != null && Texture.IsImageLoaded); //mxd
double width = textureloaded ? (worldpanning ? this.Texture.ScaledWidth / scalex : this.Texture.Width) : -1; // biwa
double height = textureloaded ? (worldpanning ? this.Texture.ScaledHeight / scaley : this.Texture.Height) : -1; // biwa
Sidedef.Fields["offsetx_mid"] = new UniValue(UniversalType.Float, GetNewTexutreOffset(oldx, offsetx, width)); //mxd // biwa
//mxd. Don't clamp offsetY of clipped mid textures
bool dontClamp = (!textureloaded || (!Sidedef.IsFlagSet("wrapmidtex") && !Sidedef.Line.IsFlagSet("wrapmidtex")));
Sidedef.Fields["offsety_mid"] = new UniValue(UniversalType.Float, GetNewTexutreOffset(oldy, offsety, dontClamp ? double.MaxValue : Texture.Height)); // biwa
}
protected override Point GetTextureOffset()
{
double oldx = Sidedef.Fields.GetValue("offsetx_mid", 0.0);
double oldy = Sidedef.Fields.GetValue("offsety_mid", 0.0);
return new Point((int)oldx, (int)oldy);
}
//mxd
protected override void ResetTextureScale()
{
Sidedef.Fields.BeforeFieldsChange();
if(Sidedef.Fields.ContainsKey("scalex_mid")) Sidedef.Fields.Remove("scalex_mid");
if(Sidedef.Fields.ContainsKey("scaley_mid")) Sidedef.Fields.Remove("scaley_mid");
}
//mxd
public override void OnTextureFit(FitTextureOptions options)
{
if(!General.Map.UDMF) return;
if(string.IsNullOrEmpty(Sidedef.MiddleTexture) || Sidedef.MiddleTexture == "-" || !Texture.IsImageLoaded) return;
FitTexture(options);
Setup();
}
/// <summary>
/// Updates the value for texture skewing. Has to be done after the texture is set.
/// </summary>
public void UpdateSkew()
{
// Reset
skew = new Vector2f(0.0f);
if (!General.Map.Config.SidedefTextureSkewing)
return;
if (General.Map.Config.SkewStyle == Config.SkewStyle.GZDoom)
{
int skewtype = Sidedef.Fields.GetValue("skew_middle", 0);
if (skewtype > 0 && skewtype <= 4 && Texture != null)
{
Plane plane;
Vector2D start = Sidedef.IsFront ? Sidedef.Line.Start.Position : Sidedef.Line.End.Position;
Vector2D end = Sidedef.IsFront ? Sidedef.Line.End.Position : Sidedef.Line.Start.Position;
if (skewtype == 1)
plane = Sector.GetSectorData().Floor.plane;
else if (skewtype == 2)
plane = Sector.GetSectorData().Ceiling.plane;
else if (skewtype == 3)
plane = mode.GetSectorData(Sidedef.Other.Sector).Floor.plane;
else // skewtype 4
plane = mode.GetSectorData(Sidedef.Other.Sector).Ceiling.plane;
double leftz = plane.GetZ(start);
double rightz = plane.GetZ(end);
skew = new Vector2f(
Vertices.Min(v => v.u), // Get the lowest horizontal texture offset
(float)((rightz - leftz) / Sidedef.Line.Length * ((double)Texture.Width / Texture.Height))
);
}
}
else if (General.Map.Config.SkewStyle == Config.SkewStyle.EternityEngine)
{
string skewtype = Sidedef.Fields.GetValue("skew_middle_type", "none");
if ((skewtype == "front_floor" || skewtype == "front_ceiling" || skewtype == "back_floor" || skewtype == "back_ceiling") && Texture != null)
{
double leftz, rightz;
if (skewtype == "front_floor")
{
if (Sidedef.IsFront)
{
Plane plane = Sector.GetSectorData().Floor.plane;
leftz = plane.GetZ(Sidedef.Line.Start.Position);
rightz = plane.GetZ(Sidedef.Line.End.Position);
}
else
{
Plane plane = mode.GetSectorData(Sidedef.Other.Sector).Floor.plane;
leftz = plane.GetZ(Sidedef.Line.End.Position);
rightz = plane.GetZ(Sidedef.Line.Start.Position);
}
}
else if (skewtype == "front_ceiling")
{
if (Sidedef.IsFront)
{
Plane plane = Sector.GetSectorData().Ceiling.plane;
leftz = plane.GetZ(Sidedef.Line.Start.Position);
rightz = plane.GetZ(Sidedef.Line.End.Position);
}
else
{
Plane plane = mode.GetSectorData(Sidedef.Other.Sector).Ceiling.plane;
leftz = plane.GetZ(Sidedef.Line.End.Position);
rightz = plane.GetZ(Sidedef.Line.Start.Position);
}
}
else if (skewtype == "back_floor")
{
if (Sidedef.IsFront)
{
Plane plane = mode.GetSectorData(Sidedef.Other.Sector).Floor.plane;
leftz = plane.GetZ(Sidedef.Line.Start.Position);
rightz = plane.GetZ(Sidedef.Line.End.Position);
}
else
{
Plane plane = Sector.GetSectorData().Floor.plane;
leftz = plane.GetZ(Sidedef.Line.End.Position);
rightz = plane.GetZ(Sidedef.Line.Start.Position);
}
}
else // Back ceiling
{
if (Sidedef.IsFront)
{
Plane plane = mode.GetSectorData(Sidedef.Other.Sector).Ceiling.plane;
leftz = plane.GetZ(Sidedef.Line.Start.Position);
rightz = plane.GetZ(Sidedef.Line.End.Position);
}
else
{
Plane plane = Sector.GetSectorData().Ceiling.plane;
leftz = plane.GetZ(Sidedef.Line.End.Position);
rightz = plane.GetZ(Sidedef.Line.Start.Position);
}
}
skew = new Vector2f(
Vertices.Min(v => v.u), // Get the lowest horizontal texture offset
(float)((rightz - leftz) / Sidedef.Line.Length * ((double)Texture.Width / Texture.Height))
);
}
}
}
/// <summary>
/// Creates clipping planes for skewed sidedefs
/// </summary>
/// <param name="textop">The texture's top position</param>
/// <param name="texbottom">The texture's bottom position</param>
/// <param name="sd">This sidedef's sector data</param>
/// <param name="osd">The other sidedef's sector data</param>
/// <returns>The top and bottom clipping planes</returns>
private (Plane, Plane) CreateSkewClipPlanes(double textop, double texbottom, SectorData sd, SectorData osd)
{
if (General.Map.Config.SkewStyle == Config.SkewStyle.GZDoom)
{
int skewtype = Sidedef.Fields.GetValue("skew_middle", 0);
if(skewtype > 0 && skewtype <= 4)
{
double diff;
Line2D line;
if (skewtype == 1)
(diff, line) = GetZDiff(true, Sidedef.IsFront);
else if(skewtype == 2)
(diff, line) = GetZDiff(false, Sidedef.IsFront);
else if(skewtype == 3)
(diff, line) = GetZDiff(true, !Sidedef.IsFront);
else // skewtype 4
(diff, line) = GetZDiff(false, !Sidedef.IsFront);
Vector2D v3 = line.GetPerpendicular() * 10 + line.v1;
Plane topplane = new Plane(
new Vector3D(line.v1, textop),
new Vector3D(line.v2, textop + diff),
new Vector3D(v3, textop),
false);
Plane bottomplane = new Plane(
new Vector3D(line.v1, texbottom),
new Vector3D(line.v2, texbottom + diff),
new Vector3D(v3, textop),
true);
return (topplane, bottomplane);
}
else // Invalid skew type
{
return (
new Plane(new Vector3D(0, 0, -1), textop),
new Plane(new Vector3D(0, 0, 1), -texbottom)
);
}
}
else if (General.Map.Config.SkewStyle == Config.SkewStyle.EternityEngine)
{
string skewtype = Sidedef.Fields.GetValue("skew_middle_type", "none");
if ((skewtype == "front_floor" || skewtype == "front_ceiling" || skewtype == "back_floor" || skewtype == "back_ceiling") && Texture != null)
{
double diff;
Line2D line;
if (skewtype == "front_ceiling")
(diff, line) = GetZDiff(false, true);
else if (skewtype == "back_ceiling")
(diff, line) = GetZDiff(false, false);
else if (skewtype == "front_floor")
(diff, line) = GetZDiff(true, true);
else // back_floor
(diff, line) = GetZDiff(true, false);
Vector2D v3 = line.GetPerpendicular() * 10 + line.v1;
Plane topplane = new Plane(
new Vector3D(line.v1, textop),
new Vector3D(line.v2, textop + diff),
new Vector3D(v3, textop),
false);
Plane bottomplane = new Plane(
new Vector3D(line.v1, texbottom),
new Vector3D(line.v2, texbottom + diff),
new Vector3D(v3, textop),
true);
return (topplane, bottomplane);
}
else // Invalid skew type
{
return (
new Plane(new Vector3D(0, 0, -1), textop),
new Plane(new Vector3D(0, 0, 1), -texbottom)
);
}
}
else // No matching skew style
{
return (
new Plane(new Vector3D(0, 0, -1), textop),
new Plane(new Vector3D(0, 0, 1), -texbottom)
);
}
// Returns the z position at the start and end vertices of the line, and a line that always goes from left to right
(double, Line2D) GetZDiff(bool floor, bool front)
{
double leftz, rightz;
Vector2D ls, le;
if (Sidedef.IsFront)
{
ls = Sidedef.Line.Start.Position;
le = Sidedef.Line.End.Position;
if (floor)
{
if (front)
{
leftz = sd.Floor.plane.GetZ(Sidedef.Line.Start.Position);
rightz = sd.Floor.plane.GetZ(Sidedef.Line.End.Position);
}
else
{
leftz = osd.Floor.plane.GetZ(Sidedef.Line.Start.Position);
rightz = osd.Floor.plane.GetZ(Sidedef.Line.End.Position);
}
}
else
{
if (front)
{
leftz = sd.Ceiling.plane.GetZ(Sidedef.Line.Start.Position);
rightz = sd.Ceiling.plane.GetZ(Sidedef.Line.End.Position);
}
else
{
leftz = osd.Ceiling.plane.GetZ(Sidedef.Line.Start.Position);
rightz = osd.Ceiling.plane.GetZ(Sidedef.Line.End.Position);
}
}
}
else
{
ls = Sidedef.Line.End.Position;
le = Sidedef.Line.Start.Position;
if (floor)
{
if (front)
{
leftz = osd.Floor.plane.GetZ(Sidedef.Line.End.Position);
rightz = osd.Floor.plane.GetZ(Sidedef.Line.Start.Position);
}
else
{
leftz = sd.Floor.plane.GetZ(Sidedef.Line.End.Position);
rightz = sd.Floor.plane.GetZ(Sidedef.Line.Start.Position);
}
}
else
{
if (front)
{
leftz = osd.Ceiling.plane.GetZ(Sidedef.Line.End.Position);
rightz = osd.Ceiling.plane.GetZ(Sidedef.Line.Start.Position);
}
else
{
leftz = sd.Ceiling.plane.GetZ(Sidedef.Line.End.Position);
rightz = sd.Ceiling.plane.GetZ(Sidedef.Line.Start.Position);
}
}
}
return (rightz - leftz, new Line2D(ls, le));
}
}
#endregion
}
}
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