> -----Original Message----- > From: Liu, Jeff (SRDC SW) [mailto:jeff1....@amd.com] > Sent: Wednesday, October 26, 2016 7:09 AM > To: gunnar.sle...@jollamobile.com; gun...@sletta.org; Liang Qi > <liang...@qt.io>; Kai Koehne <kai.koe...@qt.io>; development@qt- > project.org > Subject: RE: OpenGL Issues in Qt5.7 > > > > Spread to Qt mail-list to ask for help. > > > > From: Liu, Jeff (SRDC SW) > Sent: Tuesday, October 25, 2016 2:26 PM > To: 'gunnar.sle...@jollamobile.com'; 'gun...@sletta.org'; 'liang...@qt.io'; > 'kai.koe...@qt.io' > Subject: OpenGL Issues in Qt5.7 > > > > Hi Sletta, Qi and Koehne,
Hi Jeff! > This is Jeff from AMD, recently a customer reports a game issue with AMD > cards, but the game runs well on Nvidia card, after some debug, I find out > that the issues are caused by Qt libraries, when Qt programs with OpenGL > API, it doesn’t follow the OpenGL programming specification strictly, so it > will > report errors on AMD platform. > > Now we find out the two following issues, both issues come from Qt paint > engine. > > 1. QTBUG-56234 - OpenGL glVertexAttribArray API usage error in > Qt5Guid.dll > > I submit a ticket to address this issue, and this issue is assigned to > Sletta, but > it seems no one starts to work on it, the usage of glVertexAttribArray API is > wrong, it is still used in the old way (OpenGL 3.0), but it apparently > violate the > latest OpenGL specification (OpenGL 4.1) Liang already commented on this one. Laszlo (the new assignee) probably has a better idea about this, too. > 2. I don’t submit the ticket for the second issue yet, Qt paint engine > uses > GL_RED to upload the texture, so based on the spec, the texture will be > (GL_RED value, 0,0,1), but in pixel shader, it uses src * mask.a, which is a > constant 0 value in AMD platform, if changed to src * mask.r, then everything > will be correct, I will submit a ticket to address it later. Feel free to report this, too. > I don’t know what’s the right way to report and fix Qt issues, there may be > more issues later in the game, so I write an email to you guys (I find your > emails from code.qt.io), please tell me what should I do to co-work with you > and make these issues fixed. Reporting them on bugreports.qt.io is certainly a good start :) If you're a commercial customer you should also go through Qt Support - often enough the support team can help directly, or escalate things. Regards Kai _______________________________________________ Development mailing list Development@qt-project.org http://lists.qt-project.org/mailman/listinfo/development