Linux EGL/GLES2 - The material 'Default GLTF material' was not built for mobile.

[jwinarske]

I have been working on making Linux EGL work for the gltfw_viewer. I have refactored things so I have Linux using PlatformEGL, and have removed SDL + Imgui from FilamentApp -> FilamentFbo. Effectively using part of the ANDROID path. I'm running plain Linux on a QC SoC.

I'm hitting: The material 'Default GLTF material' was not built for mobile.

I believe I need a GLES3 compliant "Default GLTF material", as it generates for GL Core 4.

What would a "Default GLTF material" GLES3 version look like?

Instrumented output:

/home/joel/CLionProjects/filament-example/cmake-build-debug-clang/Example
Filament
FEngine (64 bits) created at 0x7f9e4937f010 (threading is enabled)
FEngine resolved backend: OpenGL
AMD, AMD Radeon RX 6800 (SIENNA_CICHLID, DRM 3.40.0, 5.12.14-300.fc34.x86_64, LLVM 12.0.0), OpenGL ES 3.2 Mesa 21.1.3, OpenGL ES GLSL ES 3.20
OS version: 0
KHR_debug OTHER: Shader Stats: SGPRS: 32 VGPRS: 16 Code Size: 140 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 16 VGPRS: 32 Code Size: 84 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
FilamentFbo::Window
mDepthMaterial
mDepthMI
mDefaultMaterial
mTransparentMaterial
cameraCube
lightmapCube
mScene
setVisibleLayers
loadDirt
loadIBL
setLayerMask
setSkybox
setIndirectLight
view->getView()->setScene(mScene)
setup+
generate shaders
create AssetLoader
getCamera
loadAsset+
The material 'Default GLTF material' was not built for mobile.
Compiled material contains shader models 0x0x4.
Signal: SIGSEGV (signal SIGSEGV: invalid address (fault address: 0x638))

[romainguy]

To keep the binaries smaller we build the default material for the target platform of the library. So when we build for desktop, we assume OpenGL, not OpenGL ES, when invoking matc. To fix this you'd have to change CMakeLists.txt to invoke matc differently:

if (IS_MOBILE_TARGET)
    set(MATC_TARGET mobile)
else()
    set(MATC_TARGET desktop)
endif()

set(MATC_API_FLAGS )

if (FILAMENT_SUPPORTS_OPENGL)
    set(MATC_API_FLAGS ${MATC_API_FLAGS} -a opengl)
endif()
if (FILAMENT_SUPPORTS_VULKAN)
    set(MATC_API_FLAGS ${MATC_API_FLAGS} -a vulkan)
endif()
if (FILAMENT_SUPPORTS_METAL)
    set(MATC_API_FLAGS ${MATC_API_FLAGS} -a metal)
endif()

...

set(MATC_BASE_FLAGS ${MATC_API_FLAGS} -p ${MATC_TARGET} ${MATC_OPT_FLAGS})

You'll need to change MATC_TARGET to be mobile to generate OpenGL ES.

Can you use EGL with OpenGL 4? You may run into other assumptions we make about what OpenGL ES is capable of.

[romainguy]

@pixelflinger

[jwinarske]

I have that change already. This is being compiled at runtime: FAssetLoader::createMaterialInstance

[romainguy]

Ah sorry, I didn't realize it was the default glTF material. You'll need to change libs/gltfio for this. It uses libfilamat and probably asks to generate GL shaders when running in a desktop environment.

[romainguy]

gltfio does the right thing:

.targetApi(filamat::targetApiFromBackend(engine->getBackend()));

But does not invoke .platform() on the builder, which defaults to DESKTOP (I believe we always use ubershaders on Android, so this code path is never used).

[jwinarske]

That was it! Thanks!

/home/joel/CLionProjects/filament-example/cmake-build-debug-clang/Example
FEngine (64 bits) created at 0x7eff49697010 (threading is enabled)
FEngine resolved backend: OpenGL
AMD, AMD Radeon RX 6800 (SIENNA_CICHLID, DRM 3.40.0, 5.12.14-300.fc34.x86_64, LLVM 12.0.0), OpenGL ES 3.2 Mesa 21.1.3, OpenGL ES GLSL ES 3.20
OS version: 0
KHR_debug OTHER: Shader Stats: SGPRS: 16 VGPRS: 32 Code Size: 84 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 32 VGPRS: 16 Code Size: 140 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
FilamentFbo::Window
mDepthMaterial
mDepthMI
mDefaultMaterial
mTransparentMaterial
cameraCube
lightmapCube
mScene
setVisibleLayers
loadDirt
loadIBL
setLayerMask
setSkybox
setIndirectLight
view->getView()->setScene(mScene)
setup+
generate shaders
create AssetLoader
getCamera
createAssetFromBinary
KHR_debug OTHER: Shader Stats: SGPRS: 32 VGPRS: 8 Code Size: 144 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 8 VGPRS: 32 Code Size: 0 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 48 VGPRS: 16 Code Size: 384 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 48 VGPRS: 32 Code Size: 1332 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 48 VGPRS: 16 Code Size: 392 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 16 VGPRS: 32 Code Size: 276 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 48 VGPRS: 32 Code Size: 1340 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
loadResources
loadResources+
loadResources-
createGroundPlane
setUICallback
setup-
KHR_debug OTHER: Shader Stats: SGPRS: 16 VGPRS: 16 Code Size: 180 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 8 VGPRS: 32 Code Size: 20 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 56 VGPRS: 24 Code Size: 752 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 72 VGPRS: 64 Code Size: 4780 LDS: 0 Scratch: 0 Max Waves: 8 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 8 VGPRS: 32 Code Size: 12 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 56 VGPRS: 24 Code Size: 752 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 72 VGPRS: 64 Code Size: 4780 LDS: 0 Scratch: 0 Max Waves: 8 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 16 VGPRS: 8 Code Size: 40 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 8 VGPRS: 32 Code Size: 0 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 32 VGPRS: 16 Code Size: 392 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 32 VGPRS: 32 Code Size: 456 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 56 VGPRS: 24 Code Size: 744 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 72 VGPRS: 64 Code Size: 4280 LDS: 0 Scratch: 0 Max Waves: 8 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 32 VGPRS: 16 Code Size: 216 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 48 VGPRS: 32 Code Size: 1336 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 32 VGPRS: 16 Code Size: 196 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 24 VGPRS: 16 Code Size: 204 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 24 VGPRS: 32 Code Size: 760 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 56 VGPRS: 32 Code Size: 1532 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 72 VGPRS: 32 Code Size: 2080 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 72 VGPRS: 32 Code Size: 2192 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 16 VGPRS: 32 Code Size: 64 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 24 VGPRS: 16 Code Size: 224 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 56 VGPRS: 24 Code Size: 764 LDS: 0 Scratch: 0 Max Waves: 16 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
KHR_debug OTHER: Shader Stats: SGPRS: 72 VGPRS: 64 Code Size: 4848 LDS: 0 Scratch: 0 Max Waves: 8 Spilled SGPRs: 0 Spilled VGPRs: 0 PrivMem VGPRs: 0
cleanup
cleanup+
cleanup-
Renderer: Commands High watermark 0 KiB (0%), 0 commands, 32 bytes/command
CircularBuffer: High watermark 159 KiB (5%)

Process finished with exit code 0