Comment # 118
on bug 80419
from Edwin Smith
In summary I think it was intimated that the issue might be caused by how XCOM deals with indices. === The game is passing indices outside start..end range, which is illegal per https://www.opengl.org/sdk/docs/man/html/glDrawRangeElementsBaseVertex.xhtml "all values in the array indices must lie between start and end, inclusive, prior to adding base vertex" === Mesa Intel and AMD/Nvidia closed source deal with this gracefully by ignoring the range hint if they are invalid however RadeonSi does not and can in some cases crash. Due to XCOM originally being designed for DirectX on Windows where this behaviour is not a fatal error combined with other OpenGL drivers on Linux & Mac also not throwing an error/warning this issue was overlooked/missed on the original port as Mesa RadeonSi was not a supported driver at the time so no-one saw the issue. This has already been fixed for our more recent games as the Mesa AMD drivers now support most of the features needed for many games so they are actively used/tested/bugs logged at Feral. We don't have any plans for a patch in the short term but we'll definitely back port this fix so we match the spec correctly into XCOM when we next patch it.
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