private void CalculateTwoSidedLowerUV(SectorPlane floor, SectorPlane ceiling,
ref Vector2 start, ref Vector2 end)
{
float lineLength = wall.Line.Segment.Length();
int height = ceiling.Height - floor.Height;
Vector2 invDimension = texture.InverseDimension;
Vector2 spanUV = new Vector2(lineLength, height) * invDimension;
Vector2 offsetUV = wall.Side.Offset.Float() * invDimension;
// If it's upper, draw from the top of the ceiling down.
if (wall.Line.Unpegged.HasUpper())
{
// Remember that this draws from the very top, so we need to
// know the sector height that will act as the top. Drawing the
// other pieces
float maxHeight = wall.Side.Sector.Ceiling.Height;
// We need to find the V coordinates from the top to do these
// correctly.
float topV = (maxHeight - ceiling.Height) * invDimension.y;
float bottomV = (maxHeight - floor.Height) * invDimension.y;
start = new Vector2(offsetUV.x, topV + offsetUV.y);
end = new Vector2(offsetUV.x + spanUV.x, bottomV + offsetUV.y);
}
else
{
start = offsetUV;
end = offsetUV + spanUV;
}
}
private static (Vector3[] vertices, Vector2[] uvCoords) CalculateVertices(SectorPlane plane,
List <Seg2F> edges, Texture texture)
{
int vertexCount = edges.Count;
Vector3[] vertices = new Vector3[vertexCount];
Vector2[] uvCoords = new Vector2[vertexCount];
for (int i = 0; i < vertexCount; i++)
{
Vector2 vertex = edges[i].Start.UnityFloat();
vertices[i] = new Vector3(vertex.x, plane.Height, vertex.y).MapUnit();
uvCoords[i] = vertex * texture.InverseDimension;
}
// If it's a ceiling, we have to reverse the triangle fan to make
// the facing side visible.
if (plane.IsCeiling)
{
Array.Reverse(vertices, 0, vertices.Length);
Array.Reverse(uvCoords, 0, uvCoords.Length);
}
return(vertices, uvCoords);
}
private void UpdateEnabledStatus(SectorPlane floor, SectorPlane ceiling)
{
if (wall.IsTwoSidedNoMiddle)
{
Disable();
isDisabled = true;
return;
}
// We do it this way just in case enabling/disabling ends up being
// a non-cheap operation.
if (floor.Height <= ceiling.Height)
{
if (isDisabled)
{
Enable();
isDisabled = false;
}
}
else
{
if (!isDisabled)
{
Disable();
isDisabled = true;
}
}
}
private static Color[] CalculateColors(SectorPlane sectorPlane, int vertexCount)
{
float lightLevel = sectorPlane.LightLevelNormalized;
Color color = new Color(lightLevel, lightLevel, lightLevel, 1.0f);
return(Arrays.Create(vertexCount, color));
}
public SubsectorMeshComponents(SubsectorPlane plane, SectorPlane sectorPlane,
List <Seg2F> edges, GameObject gameObject)
{
subsectorPlane = plane;
texture = TextureManager.Texture(plane.SectorPlane.TextureName, ResourceNamespace.Flats);
Mesh = CreateMesh(sectorPlane, edges, texture);
Filter = CreateFilter(gameObject);
Renderer = CreateRenderer(gameObject);
Collider = CreateCollider(gameObject, edges);
}
private void CalculateTwoSidedMiddleUV(SectorPlane floor, SectorPlane ceiling,
Vector3[] vertices, ref Vector2 start, ref Vector2 end)
{
// TODO: Should probably turn this into a data structure to avoid these cryptic references.
float height = vertices[2].y - vertices[0].y;
float lineLength = wall.Line.Segment.Length();
Vector2 invDimension = texture.InverseDimension;
Vector2 spanUV = new Vector2(lineLength, height) * invDimension;
Vector2 offsetUV = wall.Side.Offset.Float() * invDimension;
// TODO: Draw it to the proper clipped spot.
start = new Vector2(offsetUV.x, 0);
end = new Vector2(offsetUV.x + spanUV.x, 1);
}
public SubsectorPlane(int index, SectorPlane sectorPlane, List <Seg2F> edges)
{
Debug.Assert(edges.Count >= 3, $"Two or less lines is not a polygon (subsector plane {index})");
string facingText = sectorPlane.IsCeiling ? "Ceiling" : "Floor";
Index = index;
SectorPlane = sectorPlane;
Edges = edges.ToList();
gameObject = new GameObject($"Subsector {index} (Sector {sectorPlane.Sector.Index} Plane {sectorPlane.Index} {facingText})");
MeshComponents = new SubsectorMeshComponents(this, sectorPlane, edges, gameObject);
collisionInfo = CollisionInfo.CreateOn(gameObject, this);
sectorPlane.SubsectorPlanes.Add(this);
}
private static Mesh CreateMesh(SectorPlane sectorPlane, List <Seg2F> edges, Texture texture)
{
(Vector3[] vertices, Vector2[] uvCoords) = CalculateVertices(sectorPlane, edges, texture);
int[] indices = CalculateIndices(vertices.Length);
Vector3[] normals = CalculateNormals(sectorPlane, vertices.Length);
Color[] colors = CalculateColors(sectorPlane, vertices.Length);
return(new Mesh
{
vertices = vertices,
triangles = indices,
normals = normals,
uv = uvCoords,
colors = colors
});
}
private Vector3[] CalculateVertices(SectorPlane floor, SectorPlane ceiling)
{
float top = ceiling.Height;
float bottom = floor.Height;
Vec2F start = wall.Line.Segment.Start;
Vec2F end = wall.Line.Segment.End;
if (wall.OnBackSide)
{
(start, end) = (end, start);
}
if (wall.Section == WallSection.Middle && wall.Line.TwoSided)
{
float imageHeight = texture.Height;
float texTop = top;
float texBottom = bottom;
// Draws from the top down, unless it's lower unpegged.
if (wall.Line.Unpegged.HasLower())
{
texTop = texBottom + imageHeight;
}
else
{
texBottom = texTop - imageHeight;
}
texTop += wall.Side.Offset.Y;
texBottom += wall.Side.Offset.Y;
// Now we clip it to the gap that exists.
top = Math.Min(top, texTop);
bottom = Math.Max(bottom, texBottom);
}
return(new[]
{
new Vector3(start.X, bottom, start.Y).MapUnit(),
new Vector3(end.X, bottom, end.Y).MapUnit(),
new Vector3(start.X, top, start.Y).MapUnit(),
new Vector3(end.X, top, end.Y).MapUnit(),
});
}
private void CalculateTwoSidedUpperUV(SectorPlane floor, SectorPlane ceiling,
ref Vector2 start, ref Vector2 end)
{
float lineLength = wall.Line.Segment.Length();
int height = ceiling.Height - floor.Height;
Vector2 invDimension = texture.InverseDimension;
Vector2 spanUV = new Vector2(lineLength, height) * invDimension;
Vector2 offsetUV = wall.Side.Offset.Float() * invDimension;
// If it's upper, draw it from the top down.
if (wall.Line.Unpegged.HasUpper())
{
start = offsetUV;
end = offsetUV + spanUV;
}
else
{
end = new Vector2(spanUV.x + offsetUV.x, 1.0f - offsetUV.y);
start = new Vector2(offsetUV.x, end.y - spanUV.y);
}
}
private Vector2[] CalculateUVCoordinates(SectorPlane floor, SectorPlane ceiling,
Vector3[] vertices)
{
Vector2 start = new Vector2(0, 0);
Vector2 end = new Vector2(1, 1);
// An important note for all of the following functions:
// Remember that the texture was uploaded such that the
// 0.0 -> 1.0 coordinates look like:
//
// (0.0, 0.0) (1.0, 0.0)
// S--------o
// | Top | S = start
// | | E = end
// | |
// | |
// | Bottom |
// o--------E
// (0.0, 1.0) (1.0, 1.0)
//
// This means when we are drawing from the bottom up, we want to
// start out at the bottom UV and subtract the X/Y span and offsets
// to go upwards. Likewise if we are drawing from the top down, we
// want to start at the top two coordinates and add the span and
// offset to go down.
// In short, the coordinate system looks exactly like the image
// origin system.
switch (wall.Section)
{
case WallSection.Lower:
CalculateTwoSidedLowerUV(floor, ceiling, ref start, ref end);
break;
case WallSection.Middle:
if (wall.Line.OneSided)
{
CalculateOneSidedMiddleUV(floor, ceiling, ref start, ref end);
}
else
{
CalculateTwoSidedMiddleUV(floor, ceiling, vertices, ref start, ref end);
}
break;
case WallSection.Upper:
CalculateTwoSidedUpperUV(floor, ceiling, ref start, ref end);
break;
default:
throw new Exception($"Unexpected wall section for UV calculations: {wall.Section}");
}
// This follows easily from the comment/ASCII-art above, along with
// the vertex locations from the class documentation.
return(new[]
{
new Vector2(start.x, end.y),
new Vector2(end.x, end.y),
new Vector2(start.x, start.y),
new Vector2(end.x, start.y)
});
}
private static Vector3[] CalculateNormals(SectorPlane sectorPlane, int vertexCount)
{
Vector3 normal = sectorPlane.IsCeiling ? Vector3.down : Vector3.up;
return(Arrays.Create(vertexCount, normal));
}
