| Bug ID | 108311 |
|---|---|
| Summary | Query buffer object support is broken on r600. |
| Product | Mesa |
| Version | git |
| Hardware | x86-64 (AMD64) |
| OS | Linux (All) |
| Status | NEW |
| Severity | normal |
| Priority | medium |
| Component | Drivers/Gallium/r600 |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | awesie@gmail.com |
| QA Contact | dri-devel@lists.freedesktop.org |
Created attachment 141970 [details] [review] Patch After implementing support for query buffer objects in Wine, I got a bug report about a regression on older AMD hardware (https://bugs.winehq.org/show_bug.cgi?id=45946). The root cause was a bug in the query buffer object support for r600 in Mesa. As mentioned in the commit message for 1c9ea24a19a28e87f6038281c516287f25ad88b5, the r600 shader cannot address non-256 aligned ssbos. While that commit fixed most buffer accesses, it failed to fix ssbo[1], e.g. tmp_buffer. This led to random failures of the query buffer shader depending on whether we got lucky (e.g. tmp_buffer_offset was a multiple of 256) or not. The fix is easy. Mask tmp_buffer_offset and add another constant for when we access the tmp_buffer in the shader. Patch is attached.
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