Question

I’m trying for hours now to solve this problem..

So.. I want to use different shaders on every Sprite I draw on the screen.
I tried to make different RenderTarget2Ds but no success.

No matter how hard I try to make the Graphicsdevice.Clear() Transparent, it just won’t work.
(I use xna 3.1)

So all my sprites blocking the other sprites because I can’t make the background transparent :\

Any idea ?

Code I use (it’s a method):

 graphicsDevice.SetRenderTarget(0, r2d);
    graphicsDevice.Clear(ClearColor);
    spriteBatch.Begin();


    spriteBatch.Draw(
                tex,
               Dest,
               Source,
               moodcolor,
               this.RotationAngle,
               new Vector2(0, 0),
               Zoom,
               spriteEffect,
               this.Z_Index);

    spriteBatch.End();

    graphicsDevice.SetRenderTarget(0, null);
    graphicsDevice.Clear(ClearColor);

    for (int i = 0; i < efs.Count; i++)
    {
        efs[i].effect.CurrentTechnique = efs[i].effect.Techniques["Deferred"];

        foreach (EffectPass pass in efs[i].effect.CurrentTechnique.Passes)
        {

            spriteBatch.Begin(SpriteBlendMode.None, SpriteSortMode.Immediate, SaveStateMode.None);
            efs[i].effect.Begin();
            pass.Begin();
            spriteBatch.Draw(r2d.GetTexture(), Vector2.Zero, Color.White);
            spriteBatch.End();
            pass.End();
            efs[i].effect.End();
        }
   }

Update!
You don’t have to use RenderTarget2D!
It’s important to keep AlphaBlend!
This is solution for anybody who came across the same problem!

Solution snippet:

foreach (EffectPass pass in efs[ObjShaders[i].ShaderID].effect.CurrentTechnique.Passes)
                    {

                        spriteBatch.Begin(SpriteBlendMode.AlphaBlend, SpriteSortMode.Immediate, SaveStateMode.None);
                        efs[ObjShaders[i].ShaderID].effect.Begin();
                        pass.Begin();

                        spriteBatch.Draw(
                         tex,
                        Dest,
                        Source,
                        moodcolor,
                        this.RotationAngle,
                        new Vector2(0, 0),
                        Zoom,
                        spriteEffect,
                        this.Z_Index);

                        spriteBatch.End();
                        pass.End();
                        efs[ObjShaders[i].ShaderID].effect.End();
                    }

Answer 1

Reading your question again, perhaps all you need to do is

    spriteBatch.Begin(SpriteSortMode.BackToFront, BlendState.AlphaBlend);

Now if your sprite textures have an alpha channel, they will be blended correctly.