Hello,
I am trying to draw this simple graphic onto a GUI:
(http://i.imgur.com/UtPxynQ.png)
It's a partially transparent smiley face. The actual graphic is 16x16, but I've resized it for readability.
My game is a 32-bit colour game. I used the default game and made a new GUI called gTest. I imported the sprite and used its alpha channel. I changed Roger's interact function to:
DynamicSprite *mySprite;
function cEgo_Interact()
{
DrawingSurface *out;
if(mySprite != null)
mySprite.Delete();
mySprite = DynamicSprite.Create(16, 16, true);
out = mySprite.GetDrawingSurface();
out.DrawImage(0, 0, 6);
out.Release();
gTest.BackgroundGraphic = mySprite.Graphic;
gTest.Width = 16;
gTest.Height = 16;
gTest.X = 50;
gTest.Y = 50;
gTest.Visible = true;
}
Here is what I see when I interact with Roger:
(http://i.imgur.com/g8sZ3h1.png)
Transparent pixels where semi-opaque ones should be and opaque pixels remain where transparent ones are.
I've read some of the articles about AGS and blending and I appreciate that things are a little wonky when it comes to transparency in AGS. I'm not asking AGS to blend the sprite here. I just want it to set the alpha to a non-zero value for semi-transparent areas. Here's what I'd expect to see instead:
(http://i.imgur.com/WWpewz5.png)
I would then be able to happily turn off the border/background and have a semi-transparent GUI.
I have tried playing around with various parameters to the functions. About the only thing that seems to make a difference is toggling transparency on the surface. If I set it to false, I get the classic purple blending going on:
(http://i.imgur.com/i44IBxm.png)
I guess this proves that AGS is seeing my image has non-zero alpha in those areas, but not much else.
Please help me figure this out, guys. What do I need to do to draw this correctly on a DynamicSprite? If you want to try to replicate this, here's what I did:
1. Create a new default game
2. Set the colour depth to 32-bit
3. Add a new GUI called gTest
4. Import this sprite (here's the exact sprite: (http://i.imgur.com/bEIJOlq.png)) as sprite number 6
5. Replace Roger's interaction with the code above
6. Run the game and interact with Roger
Note: I am running 3.3.0 Beta 12.
Default game template still uses old (improper) alpha blending. Good you noticed this, needs to be fixed.
Go to General Settings and set "Visual"->"Sprite alpha rendering style" to "Proper Alpha Blending".
Also probably is a good idea to set "Visual"->"GUI alpha rendering style" to "Multiplied Translucence..." (because it is proper alpha blending too).
Thanks CW! I was tearing my hair out trying to find the right option.
Quote from: Crimson Wizard on Thu 09/01/2014 07:28:35
Go to General Settings and set "Visual"->"Sprite alpha rendering style" to "Proper Alpha Blending".
Also probably is a good idea to set "Visual"->"GUI alpha rendering style" to "Multiplied Translucence..."
WOW it's a good thing I read this thread, I didn't know the transparency fixes had been introduced that way. I definitely learnt something very useful here!
Quote from: Monsieur OUXX on Fri 10/01/2014 11:57:10
WOW it's a good thing I read this thread, I didn't know the transparency fixes had been introduced that way.
This is done for backwards-compatibility (in case you import older project and want it retain all the behavior).
In most cases there should not be a reason to use other modes than "proper" ones.
We need to fix the templates that come with 3.3.0 to have this by default. At least "Empty" and "Default" templates.