refraction crashes on Adreno 710 GPU

[naudvard]

Describe the bug In Android, when using a material with refractionMode on screenspace configured with both IOR and transmission, the app crashes when rendering on multiple phones with Adreno 710 GPU. Version : 1.67.1

To Reproduce

1. Go on sample-image-based-lighting
2. Replace clear_coat.mat content with the following :

material {
    name : clear_coat,
    shadingModel : lit,
    refractionMode: screenspace,
    refractionType: solid,
    reflections: default,
    parameters : [
        {
            type : float3,
            name : baseColor
        }
    ],
}

fragment {
    void material(inout MaterialInputs material) {
        prepareMaterial(material);

        //material.baseColor.rgb = materialParams.baseColor;
        material.baseColor = float4(1.0, 1.0, 1.0, 1.0);

        // To create a metallic paint-like material we want
        // a rough base metallic layer and a glossy clear coat
        material.roughness = 0.2;
        material.metallic = 0.0;
        material.clearCoat = 1.0;
        material.ior = 1.15;
        material.transmission = 0.5;
    }
}

3. STart the application on an Android device running an Adreno 710 GPU.
4. Observe the application crash

Expected behavior No crash

Logs sample-image-based-lighting-release-unsigned.apk_2025_12_2_14_37_11.log

Smartphone (please complete the following information):

• Device: Any device with 710 GPU, like a Xiaomi Redmi Note 13 Pro 5G
• OS: At least Android 14, 15 and 16

[show50726]

Seems like there's something Adreno driver doesn't like in the gaussian blur shader:

12-02 13:36:54.354 E/Filament(27074): Link error in "separableGaussianBlur":
12-02 13:36:54.354 E/Filament(27074):  - glError=0
12-02 13:36:54.354 E/Filament(27074):  - LogInfo="(null)"
12-02 13:36:54.354 E/Filament(27074): Postcondition
12-02 13:36:54.354 E/Filament(27074): in operator():357
12-02 13:36:54.354 E/Filament(27074): reason: OpenGL program separableGaussianBlur failed to link or compile
12-02 13:36:54.354 E/Filament(27074): 
12-02 13:36:54.355 I/libc    (27074): handling signal: 6

[naudvard]

We also found the bug on some Adreno 740, depending on the version. Here two S23 Ultra, one crashing one not: Crashing:

Not crashing:

Log of the crash:

sample-image-based-lighting-release-unsigned.apk_2025_12_4_9_55_39_Samsung_Galaxy_S23_Ultra.log

[show50726]

I'm afraid we won't be able to prioritize investigating this deeply at the moment.

However, if you have time to debug, you could try removing random lines in separableGaussianBlur.vs or separableGaussianBlur.fs and see which lines are causing the compilation error. If you can pinpoint which specific lines are upsetting the Adreno driver, we can likely patch it with a workaround.

[naudvard]

It seems to be textureLod, I replaced them in sourceTexLod (separableGaussianBlur.fs) with texture and it works just fine.

highp vec4 sourceTexLod(const highp vec2 p, float m, float l) {
    if (materialConstants_arraySampler) {
        return texture(materialParams_sourceArray, vec3(p, l));
    } else {
        return texture(materialParams_source, p);
    }
}

Precisely, it is if (materialConstants_arraySampler) { return textureLod(materialParams_sourceArray, vec3(p, l), m); } Replacing it with return textureLod(materialParams_source, p, m); works, so I think its a driver issue when passing a sampler2DArray in textureLod