| Summary: | Invalid gl_InstanceID value with combination of gl_DrawIDARB under OpenGL | ||
|---|---|---|---|
| Product: | Mesa | Reporter: | Alexander <frustumo> |
| Component: | glsl-compiler | Assignee: | mesa-dev |
| Status: | RESOLVED WONTFIX | QA Contact: | Intel 3D Bugs Mailing List <intel-3d-bugs> |
| Severity: | normal | ||
| Priority: | medium | ||
| Version: | 18.0 | ||
| Hardware: | Other | ||
| OS: | All | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
| Attachments: | app | ||
I've tried your example app with current Mesa (b3b170ade9) and for me the end result visually is the same whether or not I comment out line that adds gl_VertexID usage. Could you comment on what is the expected result with/without the line and maybe also retry test with current Mesa? I'm still on Ubuntu 16.04 and the latest available Mesa version is 18.0.5 (from x-swat). I have main_instance_draw.png without dependency on gl_VertexID. With artificial dependency rendering is correct (main_instance_draw_vertex.png). I will try to upgrade Mesa on 18.1.* branch in few days. I have no reproduction on Mesa 18.1.3. So the bug is related to Mesa 18.0.* only. Could this be related to https://bugs.freedesktop.org/show_bug.cgi?id=102678 ? This bug cannot be reproduced on a supported version of mesa, closing. |
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.
Created attachment 139374 [details] app The value of gl_InstanceID variable is incorrect when shader has gl_DrawIDARB. Inserting additional dependency on gl_VertexID or gl_BaseInstanceARB variable restores gl_InstanceID value. Uncomment 17 line inside main_vertex.glsl file to fix gl_InstanceID: // position.x += gl_VertexID * 1e-6f; There is no such problem under Vulkan API. Mesa DRI Intel(R) Iris Pro Graphics 580 (Skylake GT4e) 4.5 (Core Profile) Mesa 18.0.0-rc4