Clipping [VB.NET]

[Recoil]

I am able to draw a sprite to the screen and change the opacity values to look like night and day.  Not I am trying to achieve lighting effects for various sections of the screen that will not be affected by the dark overlay.  I'm trying to determine how I can clip the second sprite with the first CircleShape so I will have a start on a dynamic lighting effect.

Dim tmpLight As New CircleShape(300)
tmpLight.Texture = New Texture(LightGfx)
tmpLight.TextureRect = New IntRect(LightGfxInfo.Width / 2 - 150, LightGfxInfo.Height / 2 - 150, 300, 300)

tmpLight.FillColor = New SFML.Graphics.Color(255, 255, 255, 255) 'CurrLevel)
tmpLight.Position = New Vector2f(0, 0)
GameWindow.Draw(tmpLight)
 

Dim tmpSprite As Sprite
tmpSprite = New Sprite(NightGfx)
tmpSprite.TextureRect = New IntRect(0, 0, frmMainGame.GameScreen.Width, frmMainGame.GameScreen.Height)

tmpSprite.Color = New SFML.Graphics.Color(255, 255, 255, CurrLevel)
tmpSprite.Position = New Vector2f(0, 0)
GameWindow.Draw(tmpSprite)
 

I do not see any way that I am able to clip the Sprite by the CircleShape.  I would really appreciate a suggestion on a method to achieve this.

[eXpl0it3r]

SFML doesn't yet support clipping.

However you can use a render texture and blend modes to achieve similar things.

[Recoil]

Thanks for the reply.  I have looked around but am unable to find an example in vb.net of how to apply blend mode.  The closest thing I can get is Blendmode.Add() but I am unable to use this on either the sprite or the circle.

I can find stuff in c++ but nothing for vb.net.  Would you know where an example may be located?

[eXpl0it3r]

There are very, very few if any who write things in VB, however since it's .NET the C# code should also help. I'm not familiar with the .NET API, but it should be similar to C++, so you'll have to pass the BlendMode as RenderState when calling draw.

[Recoil]

GameWindow.Draw(tmpLight, New RenderStates(BlendMode.Alpha))
 

That got me the ability to use BlendMode, but the effect is identical to GameWindow.Draw(tmpLight) because my image is a transparent png.

Thanks for the help.  I may have to look into another way to achieve this.

[eXpl0it3r]

There are more than just the Alpha blending and yes the alpha blending is the default mode, but there are many more, you just need to play around with them a bit.