public SceneManager(GameStatus theGameStatus, UserInputPlayer theUserInputPlayer,
KeyBindings theKeyBindings, ResourceManager theResourceManager, RenderStatus theRenderStatus)
{
GameCore.TheGameCore.TheGameEventHandler += TheGameCore_TheGameEventHandler;
this.width = theRenderStatus.Width;
this.height = theRenderStatus.Height;
this.theGameStatus = theGameStatus;
this.theUserInputPlayer = theUserInputPlayer;
this.theKeyBindings = theKeyBindings;
this.theResourceManager = theResourceManager;
this.TheRenderStatus = theRenderStatus;
ReInitialize();
}
/// <summary>
/// This one is nearly working perfectly. There is a small error which I think can be corrected using something like
/// this
/// mouse.Y = y + (ClientRectangle.Height - glview.Size.Height);
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
/// <param name="modelViewMatrix"></param>
/// <param name="projectionMatrix"></param>
/// <param name="cameraPosition"></param>
/// <returns></returns>
public static Vector3 ConvertScreenToWorldCoords(int x, int y, Matrix4 modelViewMatrix, Matrix4 projectionMatrix,
Vector3 cameraPosition, RenderStatus renderStatus)
{
int[] viewport = new int[4];
Gl.GetIntegerv(GetPName.Viewport, viewport);
int[] zInt = new int[1];
Gl.ReadPixels(x, viewport[3] - y, 1, 1, PixelFormat.DepthComponent,
PixelType.Float, zInt);
byte[] bytes = BitConverter.GetBytes(zInt[0]);
float z = BitConverter.ToSingle(bytes, 0);
// http://www.songho.ca/opengl/gl_projectionmatrix.html
// http://web.archive.org/web/20130416194336/http://olivers.posterous.com/linear-depth-in-glsl-for-real
// The depth stored in the buffer [0 1].
float z_b = z;
// The depth in the normalized device coordinates [-1 1].
float z_n = 2.0f * z_b - 1.0f;
// The distance to the camera plane in grid units.
float z_e = 2.0f * renderStatus.ZFar * renderStatus.ZNear /
(renderStatus.ZFar + renderStatus.ZNear -
(renderStatus.ZFar - renderStatus.ZNear) * (2.0f * z_b - 1.0f));
Vector3 mouse;
// mouse.y = viewport[3] - y;
// mouse.y =-( viewport[3] - y );
// mouse.Y = y + (ClientRectangle.Height - glview.Size.Height);
mouse.x = x;
mouse.y = y; //B
mouse.z = z_n; //C
Vector4 vector = UnProject(projectionMatrix, modelViewMatrix, new Size(viewport[2], viewport[3]), mouse);
Vector3 distanceVec = -cameraPosition + vector.Xyz;
if (distanceVec.Length > renderStatus.ZFar)
{
Vector3 distNormVec = distanceVec.Normalize();
vector.Xyz = cameraPosition + (distNormVec * renderStatus.ZFar * 0.99f);
}
Vector3 coords = new Vector3(vector.x, vector.y, vector.z);
return(coords);
}
