I just
updated the sample project again to include this functionality.
You can specify a color when you load the texture which should be transparant, like this:
// note the last colorkey argument, which specifies which color to treat as transparentt = TextureLoader.FromFile(e.Device, @"..\..\media\t1.png", 16, 16, 1, Usage.None, Format.A8R8G8B8, Pool.Default, Filter.Linear, Filter.Linear, unchecked((int)0xff000000));
Then you can use the following arguments to set up alpha blending:
// Set up alpha blendingdevice.RenderState.AlphaBlendEnable = true;device.RenderState.SourceBlend = Blend.SourceAlpha;device.RenderState.DestinationBlend = Blend.InvSourceAlpha;
Since this will leave only the non-black pixels visible in our example, we can just use a single color for the rendering. This can be done through the vertex colors as you used, or through the TextureFactor constant, like this:
// Set up color operationsdevice.TextureState[0].ColorArgument1 = TextureArgument.TFactor;device.TextureState[0].ColorOperation = TextureOperation.SelectArg1;device.RenderState.TextureFactor = c1;
I've also adjusted the shader to provide the same functionality. There seems to be a very minor filtering issue with this though, so the textures look a bit 'blurred' (the alpha isn't as clearly defined as through the FFP). It looks nice enough, but if anyone could check out the sample, I'd like to know what causes this difference from the FFP (the reference device also shows this result).
