[Bug 43969] New: openGL SwapBuffers with NULL context
https://bugs.winehq.org/show_bug.cgi?id=43969 Bug ID: 43969 Summary: openGL SwapBuffers with NULL context Product: Wine Version: 2.19 Hardware: x86 OS: Linux Status: UNCONFIRMED Severity: normal Priority: P2 Component: winex11.drv Assignee: wine-bugs(a)winehq.org Reporter: jp-dev(a)inbox.ru Distribution: --- A fragment of openGL code works under Windows and crashes under wine staging 2.19 at glxdrv_wglSwapBuffers. This code can be found under the VSTGUI project (see https://git.io/vFCwl). The problem in wine is triggered because the library makes a null context current before the invocation of swapBuffers. As strange as it may be, Windows is able to render in this condition. wglMakeCurrent (deviceContext, 0); SwapBuffers (deviceContext); When I pass a context instead of 0, wine works as well. This reveals a pair of problems. First, there is a null pointer dereference in wgl_SwapBuffers. ctx->hdc is an invalid access because of the null context (I have added the `&& ctx` check). if (escape.gl_drawable && ctx) ExtEscape( ctx->hdc, X11DRV_ESCAPE, sizeof(escape), (LPSTR)&escape, 0, NULL ); This change allows the program to run without crash, but the result is no rendering. My test configuration on Windows was 8.1 with the vmware GL passthrough driver. -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.
https://bugs.winehq.org/show_bug.cgi?id=43969 JP Cimalando <jp-dev(a)inbox.ru> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jp-dev(a)inbox.ru -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.
https://bugs.winehq.org/show_bug.cgi?id=43969 Fabian Maurer <dark.shadow4(a)web.de> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |dark.shadow4(a)web.de --- Comment #1 from Fabian Maurer <dark.shadow4(a)web.de> --- Is there a binary to test with? Btw, you don't need to add yourself into the CC list when you reported the bug, you already get mails. -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.
https://bugs.winehq.org/show_bug.cgi?id=43969 --- Comment #2 from JP Cimalando <jp-dev(a)inbox.ru> --- There is a binary, I have just compiled one however it's a Vst plugin, not the easiest thing to debug. But it can reproduce this bug, which took me some tedious time to trace. I have tried to reproduce the bug in a small program, but couldn't, so the particular context must be important. I have made a debug version which has two dlls: a working one and a crashing one with null context. I load this in dssi-vst on Linux, Hermann Seib's vsthost on Windows. -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.
https://bugs.winehq.org/show_bug.cgi?id=43969 --- Comment #3 from JP Cimalando <jp-dev(a)inbox.ru> --- Created attachment 59623 --> https://bugs.winehq.org/attachment.cgi?id=59623 binaries for testing -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.
https://bugs.winehq.org/show_bug.cgi?id=43969 joaopa <jeremielapuree(a)yahoo.fr> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jeremielapuree(a)yahoo.fr --- Comment #4 from joaopa <jeremielapuree(a)yahoo.fr> --- Does the bug still occur with wine-4.9? -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.
https://bugs.winehq.org/show_bug.cgi?id=43969 --- Comment #5 from JP Cimalando <jp-dev(a)inbox.ru> --- Tried in both wine 9.4 and 9.4 staging, it's not resolved. The original dll still crashes, and the workaround dll still works. -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.
https://bugs.winehq.org/show_bug.cgi?id=43969 --- Comment #6 from JP Cimalando <jp-dev(a)inbox.ru> --- Created attachment 64671 --> https://bugs.winehq.org/attachment.cgi?id=64671 Backtrace from dssi-vst using Wine 4.9 -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.
https://bugs.winehq.org/show_bug.cgi?id=43969 --- Comment #7 from joaopa <jeremielapuree(a)yahoo.fr> --- Does the bug still occur with wine-6.5? -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.
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