[effect] Opacity

Hi,

I would like to share a new shader fx; this is the same fx of C2 Opacity command( javascript) but made with glsl so you will gain

maximum performance.

So let's try performance in live demo; We have 1200 3d stars.

At beginning the C2 opacity command used, after button clicked the glsl opacity in action.

http://gigatron3k.free.fr/html5/C2/FX/glslopacity

the .capx file : http://gigatron3k.free.fr/html5/C2/FX/glslopacity/3dstarsglslopacity.capx

capx file without plugins : http://gigatron3k.free.fr/html5/C2/FX/glslopacity/glslopacity.capx

the fx file: http://gigatron3k.free.fr/html5/C2/FX/opacity.rar

Damn thats fast!

Can't check it cause you saved it in latest beta. But basically, it is a opacity shader effect to be used instead of c2 opacity, right?

Can't check it cause you saved it in latest beta. But basically, it is a opacity shader effect to be used instead of c2 opacity, right?

megatronx

Yes, it"s useful when you need to change many object opacity(like 3d stars makes with events).

I wish this could replace the original opacity.

Gigatron

I just tried this shader with the Tint shader also applied, and the framerate dropped very low. Is your shader intended to work with other shaders?

Gigatron

I just tried this shader with the Tint shader also applied, and the framerate dropped very low. Is your shader intended to work with other shaders?

I have tested tint + opacity... you must have 60 fps without framerate loss...

Have you a .capx file to make test for me ?

That is a stark difference. Thanks for the addition!

🅽🅴🅰🆃🅾!

> Gigatron

> I just tried this shader with the Tint shader also applied, and the framerate dropped very low. Is your shader intended to work with other shaders?

>

I have tested tint + opacity... you must have 60 fps without framerate loss...

Have you a .capx file to make test for me ?

Just add the tint shader to the star sprite in your demo .capx - it slows down even more than the version without using your opacity shader. This is on a GTX 980 (newest drivers), Windows 10, in Chrome. It's topping out at 15fps. If the tint shader is put on the same layer as the star sprite, it works fine - but I'm hoping there's a way to get it functioning with the tint shader on a sprite that also uses your opacity shader.

digitalsoapbox

Just included tint inside this shader this do exactly the same fx (opacity+tint) at the same time; tint+opacity combined in one shader;

Can you download and test this one again ?

Btw i have 60fps with chrome in my 3d starsfield example;

http://gigatron3k.free.fr/html5/C2/FX/opacity.rar

digitalsoapbox

Just included tint inside this shader this do exactly the same fx (opacity+tint) at the same time; tint+opacity combined in one shader;

Can you download and test this one again ?

Btw i have 60fps with chrome in my 3d starsfield example;

http://gigatron3k.free.fr/html5/C2/FX/opacity.rar

Yes, works perfectly. Is there something in the default tint shader messing up the behavior of your opacity shader?

Really.. Tint is very basic shader just modulate red,green,blue component of texture.. the opacity is easy too;

The only difference when you combine 2 shaders in the project this mean 2 program or 2 shader program running at the same time.. this can cause framrate drop...

That makes sense. Thanks for the info. I still wonder why the results are so different. Maybe C2's renderer composites the results separately? Seems like a bug in the way shaders are handled. Or if not a bug an oversight, because this could potentially affect any object that uses more than one shader: tint + additive, blur + noise, etc.

Gigatron

Just noticed it seems to be ignoring the sprite's alpha channel - try your demo against a blue background.