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Bug
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Resolution: Unresolved
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P2: Important
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None
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6.9.1
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None
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Linux/X11
I have something similar to QTBUG-136160 except it started with 6.9.1 and I am not using nvidia but mesa with software opengl.
The webengine views are completly blank and the logs are filled with:
Compositor returned null texture
Backend texture is not a Vulkan texture.
When setting QSG_INFO=1, I have
Creating QRhi with backend OpenGL for window 0x558878401880 (wflags 0x1)
Graphics API debug/validation layers: 0
Debug markers: 0
Timestamps: 0
Prefer software device: 0
Shader/pipeline cache collection: 1
Created OpenGL context QSurfaceFormat(version 4.5, options QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions), depthBufferSize 24, redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8, samples -1, swapBehavior QSurfaceFormat::DoubleBuffer, swapInterval 1, colorSpace QColorSpace(), profile QSurfaceFormat::CompatibilityProfile)
OpenGL VENDOR: Mesa RENDERER: llvmpipe (LLVM 15.0.7, 256 bits) VERSION: 4.5 (Compatibility Profile) Mesa 23.2.1-1ubuntu3.1~22.04.3
Setting QT_LOGGING_RULES=qt.webengine.compositor.debug=true I was able to get the following output:
ANGLE_OPENGL display is initialized:
GL Renderer: ANGLE (Mesa, llvmpipe (LLVM 15.0.7 256 bits), OpenGL 4.5 (Core Profile) Mesa 23.2.1-1ubuntu3.1~22.04.3)
0 GPU(s) detected:
Disabled
NVIDIA Optimus: disabled
AMD Switchable: disabled
...
QPA Platform Plugin: xcb
Skia Graphics Context Type: GaneshGL
Native Buffer Supported: no
Native Skia Output Device: OpenGL
Initializing buffer 0x63d496068b00 with SharedImage:
Usage: Gles2Read|DisplayRead|DisplayWrite
Pixels size: 1535x827
Format: BGRA_8888
Backing: GLTextureImageBacking
Backend texture is not a Vulkan texture.
Compositor returned null texture
So it seems OpenGL on Mesa LLVMpipe is used correctly, but for some reason a Vulkan texture are expected?