Created attachment 132017 [details] Rendering problems with lit mode Hello, I have installed and built the unreal 4 engine editor from source (with no errors), and I am attempting to trial it. Firstly, since mesa still hasn't implemented openGL 4.3, which Unreal Engine requires, I am running Unreal Engine in openGL 3 mode. My graphics card is AMD HD 5570, Redwood, which will in the future receive openGL 4.3/4.5 support. So until that happens, I was planning to just run Unreal Engine in the openGL 3 mode. However, when I run openGL in that mode, it starts up without error into the project browser, but when I create a project, the rendering of the game objects are horribly wrong (see attachment). It is fine when the scene is unlit; it is only wrong with lighting. When the viewport is in lit mode (the one with the problems), it floods the console with this message: EE ../../../../../src/gallium/drivers/r600/r600_state_common.c:799 r600_shader_select - Failed to build shader variant (type=1) -1 I looked up the problem online, and it is a problem on the driver end, not on Unreal's end.
I looked up more, and this is probably a duplicate of bug 99349 (https://bugs.freedesktop.org/show_bug.cgi?id=99349) . At the end, there was a suggestion for a patch to fix this. It has not yet been released in an update, so I am applying the patch myself and checking if it works.
I built mesa with the patch, and it works.
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