Android error on reading gltf files when minify is enabled

[SakiiCode]

I am having this fatal exception on Android if minifyEnabled true is set in build.gradle

10-27 15:38:55.052 16208 16231 E AndroidRuntime: w0.l: w0.l: Couldn't load dependencies of asset: tiles/desert.gltf
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at r.d.O(Unknown Source:64)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at r.d.b0(Unknown Source:55)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at r.d.D(Unknown Source:7)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at q2.b.o(Unknown Source:2)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at p2.n.i(Unknown Source:766)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at v.t.onSurfaceChanged(Unknown Source:28)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1557)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1272)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: Caused by: w0.l: Couldn't load dependencies of asset: tiles/desert.gltf
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at r.c.b(Unknown Source:67)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at r.c.g(Unknown Source:10)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at r.d.c0(Unknown Source:14)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at r.d.b0(Unknown Source:33)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	... 6 more
10-27 15:38:55.052 16208 16231 E AndroidRuntime: Caused by: w0.l: w0.k0: Error reading file: tiles/desert.gltf
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at x0.b.a(Unknown Source:14)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at r.c.b(Unknown Source:32)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	... 9 more
10-27 15:38:55.052 16208 16231 E AndroidRuntime: Caused by: w0.k0: Error reading file: tiles/desert.gltf
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at w0.r.f(Unknown Source:35)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at c4.b.e(Unknown Source:7)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at c4.a.h(Unknown Source:12)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at c4.a.a(Unknown Source:2)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at r.c.a(Unknown Source:29)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at r.c.call(Unknown Source:0)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at x0.a$b.call(Unknown Source:2)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at java.util.concurrent.FutureTask.run(FutureTask.java:264)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:644)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at java.lang.Thread.run(Thread.java:1012)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: Caused by: w0.k0: Field not found: asset (r3.a)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: Serialization trace:
10-27 15:38:55.052 16208 16231 E AndroidRuntime: {}.asset
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at w0.r.o(Unknown Source:94)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at w0.r.p(Unknown Source:462)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	at w0.r.f(Unknown Source:10)
10-27 15:38:55.052 16208 16231 E AndroidRuntime: 	... 10 more

This is the top of desert.gltf

{
    "asset" : {
        "generator" : "Khronos glTF Blender I/O v3.3.32",
        "version" : "2.0"
    },
    "scene" : 0,
    "scenes" : [
        {
            "name" : "Scene",
            "nodes" : [
                0,
                1,
                2,
                3
            ]
        }
    ],
    "nodes" : [
        {
            "mesh" : 0,
            "name" : "Circle"
        },
...

w0.k0 is com.badlogic.gdx.utils.SerializationException
r3.a is net.mgsx.gltf.data.GLTF
w0.r.o is com.badlogic.gdx.utils.Json.readFields(JsonValue)

If I set minifyEnabled false everything works.
Tried "2.1.0" and "-SNAPSHOT" versions both give this error

[SakiiCode]

I am not sure if this is the correct way but as a workaround put

-keep class net.mgsx.gltf.data.** {
	public *;
}

in the proguard-rules.pro file

If this is actually the best solution, I suggest adding it to the install part of the readme

[mgsx-dev]

Hi, i tried using proguard for a desktop application some times ago and end up with a configuration like this :

keep 'class com.badlogic.gdx.** { *; }'
keep 'class net.mgsx.gltf.** { *; }'
keepattributes 'Signature'

TBH, there is no point to obfuscate open source library code (libgdx, gdx-gltf, and others...) only your own game code matters.

Please try this configuration and if it works for you i'll add it to the documentation.

[NickPilipenko]

Please try this configuration and if it works for you i'll add it to the documentation.

I have the same issue with proguard using, the proposed solution resolves it.
Thanks

[SakiiCode]

TBH, there is no point to obfuscate open source library code (libgdx, gdx-gltf, and others...) only your own game code matters.

I strongly disagree, as little as possible should be put into the proguard rules, otherwise you will miss out on the size reduction, reverse engineering protection, code optimization benefits.

[mgsx-dev]

fixed by 8507a98