Shaders on Android

[sorakun]

It seems that shaders are not compatible with GLSL ES, I attempted to run an example on adroid and it was not able to create shaders.

[WarpspeedSCP]

gl es doesn't support implicit type casting between int and float or default uniform values. you need to edit the shaders to remove default values from extern statements, and also to explicitly cast int to float, and vice-versa.

to not break functionality, you should also edit the lua files to send the default values to the shader at the very start, to emulate how default values work in desktop glsl.

[TangentFoxy]

@WarpspeedSCP Can these changes be made on the PC without ill effect as well? Perhaps to fix this, the repo should just have modified shaders to start with.

[WarpspeedSCP]

@Guard13007 I think it would work on desktop as well since the ES version of GLSL is a restricted form of desktop GLSL. I've seen forum posts confirm this as well.

[F483]

I would really like to use this lib for a cross platform game I'm making, so I placed a 100$ bounty on this issue to help out.

[WarpspeedSCP]

Well, I sort of managed it before, so I guess I'll just try it again and issue a pull request some time?

[F483]

Sure, as long as the lib works on all platforms (win/mac/linux/android/ios) I'm happy. Would try it myself but haven't got the time, so money is the best help I can offer.

[WarpspeedSCP]

I'll get around to it as soon as possible.

[Azorlogh]

I added a util.loadShader function to load the shaders and send the initial extern values, and fixed the implicit conversions in the shaders : #31

[F483]

Would this also fix ios? The bounty and issue are for android, but it would be nice to get two birds with one stone. Sadly I cant test ios myself.

[WarpspeedSCP]

It should. There's nothing platform specific in the way love handles graphics.

[Azorlogh]

So is it good ?

[WarpspeedSCP]

It fixes most of it, but 1 shader(phosphor.glsl) will still stop love. see here

EDIT OK, I tried these changes on my phone (android) and it caused a kernel panic or something (it freezes, then reboots)

Maybe it's just the demo, but something in this code doesn't agree with android (maybe also ios?).

[WarpspeedSCP]

lw.zip Try it (if you dare) rename the .zip to .love. I haven't tested on desktop (though it probably wouldn't cause such problems)

EDIT - Desktop works fine. It's absoutely unusable on android though.

[F483]

Fantastic! The zip above does work on my android setup. With low performance, but that is another issue.

I do however get the following error when I press the back button on the short example.

[Azorlogh]

Weird! I just tried the phosphor.glsl again, but it works fine on my phone.
F483: I'm getting that too, I'll try to see what's going on.