public void Draw()
{
float dot = Vector3.Dot(SkyDome.LightDirection, Camera.Forward);
if (dot < 0.5f)
{
foreach (Flare flare in flares)
{
SpriteDrawer.SetVisible(flare.id, false);
}
return;
}
Matrix infiniteView = Camera.ViewMatrix;
infiniteView[3, 0] = infiniteView[3, 1] = infiniteView[3, 2] = 0;
// Project the light position into 2D screen space.
Viewport vp = Game.Device.Rasterizer.GetViewports()[0];
Matrix proj = Matrix.PerspectiveFovLH(Camera.Fovx, Camera.AspectRatio, 1.0f, 1000000.0f);
Vector3 projectedPosition = Vector3.Project(-SkyDome.LightDirection, vp.X, vp.Y, vp.Width, vp.Height, vp.MinZ, vp.MaxZ, Matrix.Identity * infiniteView * proj);
projectedPosition.X /= WeatherGame.Framework.Rendering.DeferredRenderer.RenderWidth;
projectedPosition.Y /= WeatherGame.Framework.Rendering.DeferredRenderer.RenderHeight;
Vector2 lightPosition = new Vector2(projectedPosition.X * 2.0f - 1.0f, (projectedPosition.Y * 2.0f - 1.0f) * -1);
UpdateOcclusion();
DrawFlares(lightPosition);
}
void DrawFlares(Vector2 lightPosition)
{
// Lensflare sprites are positioned at intervals along a line that
// runs from the 2D light position toward the center of the screen.
Vector2 screenCenter = Vector2.Zero;
Vector2 flareVector = screenCenter - lightPosition;
foreach (Flare flare in flares)
{
SpriteDrawer.SetVisible(flare.id, true);
// Compute the position of this flare sprite.
Vector2 flarePosition = lightPosition + flareVector * flare.Position;
Color4 c = new SlimDX.Color4(flare.Color);
c *= new Color4(SkyDome.SunColor);
c *= occlusionAlpha;
SpriteDrawer.AddInstance(flare.id, flare.Texture, flarePosition, c, flare.Scale / 2, SpriteBlendMode.Additive);
}
}
