<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - High latency using GL_FEEDBACK mode" href="https://bugs.freedesktop.org/show_bug.cgi?id=97489#c4">Comment # 4</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - High latency using GL_FEEDBACK mode" href="https://bugs.freedesktop.org/show_bug.cgi?id=97489">bug 97489</a> from <a class="email" href="mailto:kenneth@whitecape.org" title="Kenneth Graunke <kenneth@whitecape.org>"> Kenneth Graunke</a> <pre>Yes, glRenderMode has been deprecated for a long long time. If you want to disable rendering, you can use glEnable(GL_RASTERIZER_DISCARD). Transform feedback (GL 3.0) can record a subset of your vertex shader's outputs into a buffer. Another alternative would be to have your vertex shader write data into a shader storage buffer object (SSBO) (GL 4.3). Unfortunately, both of those options give you data pre-clipping, while glRenderMode(GL_FEEDBACK) gives you data post-clipping. It's a bit awkward because there isn't an exact replacement for the deprecated functionality. The thing is, GL_FEEDBACK and GL_SELECT don't really exist in hardware. We have to emulate them somehow in the driver.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>