/// <summary>
/// Create a view matrix for this Camera
/// </summary>
public static Matrix4 GetViewMatrix(ICamera2 camera, bool isOrtho = true)
{
Transform2 transform = camera.GetWorldTransform();
Matrix4 m = Matrix4.CreateRotationZ(transform.Rotation);
Vector3 lookat = new Vector3(transform.Position) + Vector3.Transform(new Vector3(0, 0, -1), m);
Vector3 eye;
Matrix4 perspective;
if (isOrtho)
{
float x = camera.ViewOffset.X / 2;
float y = camera.ViewOffset.Y / 2;
float width = transform.Scale.X * camera.Aspect;
float height = transform.Scale.Y;
x *= transform.Scale.X * camera.Aspect;
y *= transform.Scale.Y;
perspective = Matrix4.CreateOrthographicOffCenter(x - width / 2, x + width / 2, y - height / 2, y + height / 2, camera.ZNear, camera.ZFar);
eye = new Vector3(transform.Position) + new Vector3(0, 0, 50);
return Matrix4.LookAt(eye, lookat, new Vector3(GetUp(camera))) * perspective;
}
perspective = Matrix4.CreatePerspectiveFieldOfView((float)camera.Fov, camera.Aspect, 0.01f, 10000f);
perspective = Matrix4.CreateScale(transform.Scale.X, transform.Scale.Y, Math.Abs(transform.Size)) * perspective;
eye = new Vector3(transform.Position) + new Vector3(0, 0, (float)GetWorldZ(camera));
return Matrix4.LookAt(eye, lookat, new Vector3(GetUp(camera))) * perspective * Matrix4.CreateTranslation(new Vector3(-camera.ViewOffset.X, -camera.ViewOffset.Y, 0));
}
//get xy world offset needed to make v appear to overlap target in screen space.
public static Vector2 GetOverlapOffset(ICamera2 camera, Vector3 v, Vector3 target)
{
Vector3 cameraPos = new Vector3(camera.GetWorldTransform().Position);
cameraPos.Z = (float)GetWorldZ(camera);
float x = (v.X - cameraPos.X) / (v.Z - cameraPos.Z) - (target.X - cameraPos.X) / (target.Z - cameraPos.Z);
float y = (v.Y - cameraPos.Y) / (v.Z - cameraPos.Z) - (target.Y - cameraPos.Y) / (target.Z - cameraPos.Z);
Vector2 offset = -new Vector2(x, y) * (v.Z - cameraPos.Z);
return offset;
}
public static Transform2 GetWorldViewpoint(ICamera2 camera)
{
return new Transform2(camera.ViewOffset).Transform(camera.GetWorldTransform());
}
private static double GetWorldZ(ICamera2 camera)
{
return Math.Abs(camera.GetWorldTransform().Size / (2 * Math.Tan(camera.Fov / 2)));
}
private static Vector2 GetUp(ICamera2 camera)
{
Matrix4 m = Matrix4.CreateRotationZ(camera.GetWorldTransform().Rotation);
return Vector2Ext.Transform(new Vector2(0, 1), m);
}
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;
}
/// <summary>
/// Draw the edges for each portal potentially including motion blur.
/// </summary>
/// <param name="portalViewList"></param>
/// <param name="cam"></param>
private void RenderPortalEdges(List<PortalView> portalViewList, ICamera2 cam)
{
int iterations = Math.Min(portalViewList.Count, StencilMaxValue);
/* Escape early if there aren't any visible portals.
* The first iteration is just for the main view which doesn't have portal edges.*/
if (iterations <= 1)
{
return;
}
GL.Clear(ClearBufferMask.DepthBufferBit);
SetEnable(EnableCap.StencilTest, false);
GL.Disable(EnableCap.DepthTest);
GL.Clear(ClearBufferMask.StencilBufferBit);
Clipper c = new Clipper();
c.StrictlySimple = true;
Model portalEdges = new Model();
portalEdges.SetTexture(Textures["lineBlur.png"]);
SetEnable(EnableCap.Blend, true);
for (int i = 1; i < iterations; i++)
{
for (int j = 0; j < 2; j++)
{
LineF line = portalViewList[i].FovLines[j];
float minWidth = Math.Abs(cam.GetWorldTransform().Size) / 300;
double angleDiff = GetLineBlurAngle(line, portalViewList[i].FovLinesPrevious[j]);
float widthEnd = (float)Math.Tan(angleDiff) * line.Length;
widthEnd = Math.Max(widthEnd, minWidth);
Vector2[] lineWidth = PolygonFactory.CreateLineWidth(line, minWidth);
Vector2 camPos = cam.GetWorldTransform().Position;
Vector2[] lineWidthOff = Vector2Ext.Transform(lineWidth, Matrix4.CreateTranslation(new Vector3(-camPos)));
Vector2[] lineTarget = PolygonFactory.CreateLineWidth(line.Translate(-camPos), minWidth, widthEnd);
Matrix4d homography = Matrix4d.CreateTranslation(new Vector3d((Vector2d)(-camPos)));
homography *= MathExt.GetHomography(lineWidthOff, lineTarget);
homography *= Matrix4d.CreateTranslation(new Vector3d((Vector2d)camPos));
bool obscured = true;
for (int k = 0; k < portalViewList[i].Parent.Paths.Count; k++)
{
List<IntPoint> path = portalViewList[i].Parent.Paths[k];
if (Clipper.PointInPolygon(ClipperConvert.ToIntPoint(line[0]), path) == 1)
{
obscured = false;
break;
}
}
if (obscured)
{
continue;
}
foreach (PortalView p in portalViewList[i].Parent.Children)
{
if (p == portalViewList[i])
{
continue;
}
if (p.PortalLine.IsInsideFOV(camPos, line[0]))
{
obscured = true;
break;
}
}
if (obscured)
{
continue;
}
int index = ModelFactory.AddPolygon((Mesh)portalEdges.Mesh, lineWidth);
IMesh mesh = portalEdges.Mesh;
for (int k = index; k < mesh.GetVertices().Count; k++)
{
Vertex vertex = mesh.GetVertices()[k];
Vector3 pos = Vector3Ext.Transform(vertex.Position, homography);
pos.Z = CameraExt.UnitZToWorld(cam, pos.Z);
Vector2 texCoord;
Vector2 v = new Vector2(vertex.Position.X, vertex.Position.Y);
double distance = MathExt.PointLineDistance(v, line.GetPerpendicularLeft(), false);
double texCoordX = MathExt.PointLineDistance(v, line, false) / minWidth;
if (line.GetSideOf(v) == Side.Left)
{
texCoordX *= -1;
}
texCoordX += 0.5;
texCoord = new Vector2((float)texCoordX, (float)(distance / line.Length));
mesh.GetVertices()[k] = new Vertex(pos, texCoord);
}
}
}
RenderModel(portalEdges, CameraExt.GetViewMatrix(cam, false));
SetEnable(EnableCap.Blend, false);
GL.Enable(EnableCap.DepthTest);
}