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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Calculating the scissors fields when the y is flipped (0 on top) can generate negative numbers that will cause assertion failure later on."
href="https://bugs.freedesktop.org/show_bug.cgi?id=108999">108999</a>
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<th>Summary</th>
<td>Calculating the scissors fields when the y is flipped (0 on top) can generate negative numbers that will cause assertion failure later on.
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<th>Product</th>
<td>Mesa
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<th>Version</th>
<td>git
</td>
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<th>Hardware</th>
<td>Other
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>Drivers/DRI/i965
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<th>Assignee</th>
<td>intel-3d-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>estea@igalia.com
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<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=142768" name="attach_142768" title="piglit test that triggers SCISSOR bbox clamping errors when the y is flipped (0 on top)">attachment 142768</a> <a href="attachment.cgi?id=142768&action=edit" title="piglit test that triggers SCISSOR bbox clamping errors when the y is flipped (0 on top)">[details]</a></span>
piglit test that triggers SCISSOR bbox clamping errors when the y is flipped (0
on top)
In the function set_scissor_bits, when the y is flipped we might generate
negative values. We should clamp them because all the GenX(SCISSOR) struct
fields are unsigned and we will have an assertion failure when
GenX(SCISSOR_RECT_pack) is going to be called.
I am attaching a piglit test that can trigger this problem.
When the window size is 800x600 calling glViewport with the values:
glViewport(2, 602, 262, 296);
before glDrawArrays will cause the assertion failure.
I am about to submit a fix for this bug.</pre>
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