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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - radv: si_scissor_from_viewport returns incorrect result when using half-pixel viewport offset"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106074">106074</a>
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<th>Summary</th>
<td>radv: si_scissor_from_viewport returns incorrect result when using half-pixel viewport offset
</td>
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>git
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>Drivers/Vulkan/radeon
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<th>Assignee</th>
<td>mesa-dev@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>philip.rebohle@tu-dortmund.de
</td>
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<th>QA Contact</th>
<td>mesa-dev@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=138865" name="attach_138865" title="Sample program to demonstrate the issue">attachment 138865</a> <a href="attachment.cgi?id=138865&action=edit" title="Sample program to demonstrate the issue">[details]</a></span>
Sample program to demonstrate the issue
For the following viewport, si_scissor_from_viewport returns an incorrect
scissor rectangle:
VkViewport vp = { 0.5f, 1.5f, 1.0f, -1.0f, 0.0f, 1.0f };
Expected result: offset = (0,0), size = (1,1)
Actual result: offset = (1,1), size = (0,0)
This breaks Final Fantasy XIV on DXVK, see:
<a href="https://github.com/doitsujin/dxvk/issues/208">https://github.com/doitsujin/dxvk/issues/208</a>
The attachment contains a small C program to demonstrate the issue with the
relevant functions directly taken from si_cmd_buffer.c.</pre>
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