On Mon, Jan 27, 2014 at 5:53 PM, Stefan Dösinger stefandoesinger@gmail.com wrote:
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Am 2014-01-26 14:08, schrieb Ruslan Kabatsayev:
For end user this looks like failing software, and moreover, it's not easy to understand which software does have bug. Wine perspective: On the one hand, wine seems to use what Mesa exposes. On the other, why use shaders for games which don't need them?
There are some corner cases in the d3d fixed function pipeline which we can't handle properly without shaders. Unfortunately, once we detect such a corner case it's too late to turn on shaders.
A possible workaround for the user is to set UseGLSL=disabled. It's not a good long-term fix though.
Mesa perspective: On the one hand, it wants to advertise more support for latest OpenGL standards. On the other, why do it for very old HW which doesn't support it?
Does the "slow" mean that Wine hits a software rendering fallback and Mesa emulates vertex shaders with the CPU? I hated it when OSX advertised features the card didn't have, and I think it's a very bad idea for Mesa to do the same thing.
Yes, a SW fallback. Vertex shaders are always on CPU on i915 by design. It's fragment shaders which suffer from SW fallback when something is used which is unsupported by the chip.
The GL errors should be fixed though. Can you try to find the commits in Wine and Mesa that started those errors?
Yeah, I've already bisected Mesa. Its commits (which appear next to each other in history) are:
1) The one making wine 1.5.17 slow: 97217a40f97cdeae0304798b607f704deb0c3558 is the first bad commit commit 97217a40f97cdeae0304798b607f704deb0c3558 Author: Eric Anholt eric@anholt.net Date: Wed Apr 17 13:55:08 2013 -0700
i915: Always enable GL 2.0 support.
There's no point in shipping a non-GL2 driver today.
:040000 040000 d039f68bbc5a5e610adbeb3d310350a844911fea efac289465401566fec6063b544c0a844e302559 M src
2) The one leading to GL_INVALID_FRAMEBUFFER_OPERATION: 4df1b986d3e44dc035227054000a1d0e1846ef07 is the first bad commit commit 4df1b986d3e44dc035227054000a1d0e1846ef07 Author: Eric Anholt eric@anholt.net Date: Wed Apr 17 19:10:29 2013 -0700
i915: Add support for GL_EXT_texture_sRGB and GL_EXT_texture_sRGB_decode.
This brings the driver up to GL 2.1.
:040000 040000 efac289465401566fec6063b544c0a844e302559 5bd49114ce64a359f4a0e3673ec27ca01590adbc M src
I'm bisecting wine now to find which commit starts GL_INVALID_FRAMEBUFFER_OPERATION error.
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