/// <summary>
/// This Init function also doubles as an update function
/// in case the position or size of the billboard changes.
/// </summary>
public void InitDeviceResources(GraphicsDevice device)
{
// Init the vertex buffer.
if (vbuf == null)
{
vbuf = new VertexBuffer(device, typeof(Vertex), 4, BufferUsage.WriteOnly);
// Create local vertices.
Vertex[] localVerts = new Vertex[4];
{
localVerts[0] = new Vertex(new Vector3(-size.X / 2.0f, size.Y / 2.0f, 0.0f), new Vector2(0, 0));
localVerts[1] = new Vertex(new Vector3(size.X / 2.0f, size.Y / 2.0f, 0.0f), new Vector2(1, 0));
localVerts[2] = new Vertex(new Vector3(size.X / 2.0f, -size.Y / 2.0f, 0.0f), new Vector2(1, 1));
localVerts[3] = new Vertex(new Vector3(-size.X / 2.0f, -size.Y / 2.0f, 0.0f), new Vector2(0, 1));
}
// Copy to vertex buffer.
vbuf.SetData <Vertex>(localVerts);
}
// Init the effect.
if (effect == null)
{
effect = BokuGame.Load <Effect>(BokuGame.Settings.MediaPath + @"Shaders\Billboard");
ShaderGlobals.RegisterEffect("Billboard", effect);
effectCache.Load(effect);
technique = premultipliedAlpha
? effect.Techniques["PremultipliedAlphaColorPass"]
: effect.Techniques["NormalAlphaColorPass"];
}
// Load the texture.
if (textureFilename != null)
{
// First try and load it as a programming tile.
texture = CardSpace.Cards.CardFaceTexture(textureFilename);
// If that didn't work, treat it as an asset name.
if (texture == null)
{
texture = BokuGame.Load <Texture2D>(BokuGame.Settings.MediaPath + textureFilename);
}
}
if (texture != null && size == Vector2.Zero)
{
UiCamera c = new UiCamera();
size.X = texture.Width / c.Dpi; // 96 DPI
size.Y = texture.Height / c.Dpi;
}
} // end of InitDeviceResources()
} // end of GetHitUV
/// <summary>
/// Returns it in world coords of ray through mouse pixel.
/// </summary>
/// <param name="camera">UiCamera (orthographic)</param>
/// <param name="invWorldMatrix">Inverse of object's world matrix.</param>
/// <param name="useRtCoords">Adjust mouse hit for rendering to a render target?</param>
/// <returns></returns>
public static Vector2 GetHitOrtho(UiCamera camera, ref Matrix invWorldMatrix, bool useRtCoords)
{
Vector2 mousePosition;
if (useRtCoords)
{
mousePosition = MouseInput.GetMouseInRtCoords();
}
else
{
mousePosition = new Vector2(MouseInput.Position.X, MouseInput.Position.Y);
}
Vector2 hit = Vector2.Zero;
// Convert from pixels to world units.
hit.X = mousePosition.X * camera.Width / camera.Resolution.X;
hit.Y = mousePosition.Y * camera.Height / camera.Resolution.Y;
// Put origin at center.
hit.X -= camera.Width / 2.0f;
hit.Y -= camera.Height / 2.0f;
// Flip vertical axis.
hit.Y = -hit.Y;
Vector3 actualFrom = camera.ActualFrom;
Vector3 actualAt = camera.ActualAt;
// Apply object and camera translation
hit.X += invWorldMatrix.Translation.X + actualAt.X + camera.Offset.X;
hit.Y += invWorldMatrix.Translation.Y + actualAt.Y + camera.Offset.Y;
// Adjust if camera not going along Z axis.
hit.X *= (float)Math.Cos(Math.Atan(camera.ViewDir.X / camera.ViewDir.Z));
hit.Y *= (float)Math.Cos(Math.Atan(camera.ViewDir.Y / camera.ViewDir.Z));
// Need to adjust if object is not at z==0.
if (invWorldMatrix.Translation.Z != 0)
{
float fraction = invWorldMatrix.Translation.Z / (actualFrom.Z - actualAt.Z);
hit.X -= (actualFrom.X - actualAt.X) * fraction;
hit.Y -= (actualFrom.Y - actualAt.Y) * fraction;
}
return(hit);
} // end of GetHitOrtho()
