public PortalView(PortalView parent, Matrix4 viewMatrix, List<List<IntPoint>> path, LineF[] fovLines, LineF[] fovLinesPrevious, LineF portalLine)
{
PortalLine = portalLine;
FovLines = fovLines;
FovLinesPrevious = fovLinesPrevious;
Children = new List<PortalView>();
Parent = parent;
if (Parent != null)
{
Parent.Children.Add(this);
}
ViewMatrix = viewMatrix;
Paths = path;
}
public static PortalView CalculatePortalViews(IList<IPortal> portals, ICamera2 camera, int depth)
{
Debug.Assert(camera != null);
Debug.Assert(depth >= 0);
Debug.Assert(portals != null);
List<IntPoint> view = ClipperConvert.ToIntPoint(CameraExt.GetWorldVerts(camera));
List<List<IntPoint>> paths = new List<List<IntPoint>>();
paths.Add(view);
PortalView portalView = new PortalView(null, CameraExt.GetViewMatrix(camera), view, new LineF[0], new LineF[0]);
Vector2 camPos = camera.GetWorldTransform().Position;
List<Func<bool>> actionList = new List<Func<bool>>();
foreach (IPortal p in portals)
{
actionList.Add(() => CalculatePortalViews(p, null, portals, CameraExt.GetViewMatrix(camera), camPos, camPos - camera.GetWorldVelocity().Position / Controller.DrawsPerSecond, portalView, Matrix4.Identity, actionList));
}
while (actionList.Count > 0 && depth > 0)
{
bool result = actionList.First().Invoke();
if (result)
{
depth--;
}
actionList.RemoveAt(0);
}
return portalView;
}
private static bool CalculatePortalViews(IPortal portal, IPortal portalEnter, IList<IPortal> portals, Matrix4 viewMatrix, Vector2 viewPos, Vector2 viewPosPrevious, PortalView portalView, Matrix4 portalMatrix, List<Func<bool>> actionList)
{
const float AREA_EPSILON = 0.0001f;
Clipper c = new Clipper();
//The clipper must be set to strictly simple. Otherwise polygons might have duplicate vertices which causes poly2tri to generate incorrect results.
c.StrictlySimple = true;
if (!_isPortalValid(portalEnter, portal, viewPos))
{
return false;
}
Vector2[] fov = Vector2Ext.Transform(Portal.GetFov(portal, viewPos, 500, 3), portalMatrix);
if (MathExt.GetArea(fov) < AREA_EPSILON)
{
return false;
}
List<IntPoint> pathFov = ClipperConvert.ToIntPoint(fov);
var viewNew = new List<List<IntPoint>>();
c.AddPath(pathFov, PolyType.ptSubject, true);
c.AddPaths(portalView.Paths, PolyType.ptClip, true);
c.Execute(ClipType.ctIntersection, viewNew);
c.Clear();
if (viewNew.Count <= 0)
{
return false;
}
c.AddPaths(viewNew, PolyType.ptSubject, true);
foreach (IPortal other in portals)
{
if (other == portal)
{
continue;
}
if (!_isPortalValid(portalEnter, other, viewPos))
{
continue;
}
//Skip this portal if it's inside the current portal's FOV.
LineF portalLine = new LineF(Portal.GetWorldVerts(portal));
LineF portalOtherLine = new LineF(Portal.GetWorldVerts(other));
if (portalLine.IsInsideFOV(viewPos, portalOtherLine))
{
continue;
}
Vector2[] otherFov = Vector2Ext.Transform(Portal.GetFov(other, viewPos, 500, 3), portalMatrix);
if (MathExt.GetArea(otherFov) < AREA_EPSILON)
{
continue;
}
otherFov = MathExt.SetWinding(otherFov, true);
List<IntPoint> otherPathFov = ClipperConvert.ToIntPoint(otherFov);
c.AddPath(otherPathFov, PolyType.ptClip, true);
}
var viewNewer = new List<List<IntPoint>>();
c.Execute(ClipType.ctDifference, viewNewer, PolyFillType.pftNonZero, PolyFillType.pftNonZero);
c.Clear();
if (viewNewer.Count <= 0)
{
return false;
}
Vector2 viewPosNew = Vector2Ext.Transform(viewPos, Portal.GetLinkedMatrix(portal, portal.Linked));
Vector2 viewPosPreviousNew = Vector2Ext.Transform(viewPosPrevious, Portal.GetLinkedMatrix(portal, portal.Linked));
Matrix4 portalMatrixNew = Portal.GetLinkedMatrix(portal.Linked, portal) * portalMatrix;
Matrix4 viewMatrixNew = portalMatrixNew * viewMatrix;
LineF[] lines = Portal.GetFovLines(portal, viewPos, 500);
lines[0] = lines[0].Transform(portalMatrix);
lines[1] = lines[1].Transform(portalMatrix);
LineF[] linesPrevious = Portal.GetFovLines(portal, viewPosPrevious, 500);
linesPrevious[0] = linesPrevious[0].Transform(portalMatrix);
linesPrevious[1] = linesPrevious[1].Transform(portalMatrix);
LineF portalWorldLine = new LineF(Portal.GetWorldVerts(portal));
portalWorldLine = portalWorldLine.Transform(portalMatrix);
PortalView portalViewNew = new PortalView(portalView, viewMatrixNew, viewNewer, lines, linesPrevious, portalWorldLine);
foreach (IPortal p in portals)
{
actionList.Add(() =>
CalculatePortalViews(p, portal, portals, viewMatrix, viewPosNew, viewPosPreviousNew, portalViewNew, portalMatrixNew, actionList)
);
}
return true;
}
public PortalView(PortalView parent, Matrix4 viewMatrix, List<IntPoint> path, LineF[] fovLines, LineF[] fovLinesPrevious)
: this(parent, viewMatrix, new List<List<IntPoint>>(), fovLines, fovLinesPrevious, null)
{
Paths.Add(path);
}
/// <summary>Sets scissor region around a portalview.</summary>
/// <param name="viewMatrix">Camera view matrix, do not use view matrix for the portalview.</param>
private void SetScissor(PortalView view, Matrix4 viewMatrix)
{
Debug.Assert(view != null);
if (view.Paths == null)
{
ResetScissor();
return;
}
Matrix4 ScaleMatrix;
ScaleMatrix = viewMatrix * Matrix4.CreateTranslation(new Vector3(1, 1, 0));
ScaleMatrix = ScaleMatrix * Matrix4.CreateScale(new Vector3(CanvasSize.Width / (float)2, CanvasSize.Height / (float)2, 0));
Vector2 vMin, vMax;
vMin = ClipperConvert.ToVector2(view.Paths[0][0]);
vMax = ClipperConvert.ToVector2(view.Paths[0][0]);
for (int i = 0; i < view.Paths.Count; i++)
{
for (int j = 0; j < view.Paths[i].Count; j++)
{
Vector2 vTransform = Vector2Ext.Transform(ClipperConvert.ToVector2(view.Paths[i][j]), ScaleMatrix);
vMax = Vector2.ComponentMax(vMax, vTransform);
vMin = Vector2.ComponentMin(vMin, vTransform);
}
}
//The -1 and +3 are margins to prevent rounding errors from making the scissor box too small.
GL.Scissor((int)vMin.X - 1, (int)vMin.Y - 1, (int)(vMax.X - vMin.X) + 3, (int)(vMax.Y - vMin.Y) + 3);
}
