Comment # 22
on bug 111077
from roland@rptd.ch
Hi Marek, This is going to be complicated. The application is not yet free to use by others (working on getting it to release shape). I would have to figure out first how to break this down into a reproducible test case since I don't know myself what triggers the bug. If you can think of some corner values to narrow down in what direction to search I can fully mess with the source code over here. The faulty commit talks about UBO maximum size so this might be a start. The OpenGL Capabilities from the GPU is this: - UBO Maximum Block Size = 65536 - UBO Buffer Offset Alignment = 4 So the maximum size used by the application is 65536 bytes. UBOs are used as shared buffers so blocks of data are placed next to each other respecting alignment and updated. UBOs are created like this: glBindBuffer(GL_UNIFORM_BUFFER, pUBO) // <= done once glBufferData(GL_UNIFORM_BUFFER, bufferSize, NULL, GL_DYNAMIC_DRAW) // <= done once glMapBufferRange(GL_UNIFORM_BUFFER, stride * elementCount, elementStride, GL_WRITE_ONLY | GL_MAP_INVALIDATE_RANGE_BIT) // <= done for each data block written Data then written and unmapped In particular this means a larger UBO is created once then individual blocks are written to it using ranged mapping. Just a wield guess but could the problem be related to this kind of usage pattern?
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