<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - Space Rangers 2 (in Wine) shows only black screen" href="https://bugs.freedesktop.org/show_bug.cgi?id=91171#c4">Comment # 4</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - Space Rangers 2 (in Wine) shows only black screen" href="https://bugs.freedesktop.org/show_bug.cgi?id=91171">bug 91171</a> from <a class="email" href="mailto:imirkin@alum.mit.edu" title="Ilia Mirkin <imirkin@alum.mit.edu>"> Ilia Mirkin</a> <pre>Ah yeah, nouveau fails pretty substantially at multiple concurrent GL contexts used simultaneously from different threads (this is a nouveau shortcoming, not a mesa one). Multiple contexts that are switched around with glXMakeCurrent from a single thread should operate fine though. Indeed looking at the trace, I see 79407 glBindFramebuffer(target = GL_DRAW_FRAMEBUFFER, framebuffer = 0) 79409 glReadBuffer(mode = GL_COLOR_ATTACHMENT0) 79412 glDrawBuffer(mode = GL_FRONT) 79417 glBlitFramebuffer(srcX0 = 0, srcY0 = 0, srcX1 = 1024, srcY1 = 768, dstX0 = 0, dstY0 = 768, dstX1 = 1024, dstY1 = 0, mask = GL_COLOR_BUFFER_BIT, filter = GL_NEAREST) 79419 glFlush() followed immediately by creating a (actually two!) new contexts, and discarding the old stuff. [Looks like it does both glXCreateContext *and* glXCreateContextAttribsARB, and discards the first one of those.] I was looking over what flush did, and it does indeed explicitly flush the frontbuffer to screen if it's the current drawbuffer. [or something along those lines]. Tracing through that flow, it's entirely over my head... interactions between multiple modules of which I know nothing. I don't see anywhere where it'd be waiting for that blit to complete either, but that doesn't mean it's not there. Perhaps this should be a glFinish()? I'm afraid this will have to wait for someone to understand what the issue is before it can be fixed.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>