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<base href="https://bugs.freedesktop.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Meta mipmap generation can corrupt texture state"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93717">93717</a>
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<th>Summary</th>
<td>Meta mipmap generation can corrupt texture state
</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
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<th>Severity</th>
<td>normal
</td>
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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>idr@freedesktop.org
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<th>Reporter</th>
<td>idr@freedesktop.org
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<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
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<p>
<div>
<pre>At the end of _mesa_meta_GenerateMipmap, is the following sequence:
_mesa_meta_end(ctx);
_mesa_TexParameteri(target, GL_TEXTURE_MAX_LEVEL, maxLevelSave);
if (genMipmapSave)
_mesa_TexParameteri(target, GL_GENERATE_MIPMAP, genMipmapSave);
if (swizzleSaved)
_mesa_TexParameteriv(target, GL_TEXTURE_SWIZZLE_RGBA, swizzle);
maxLevelSave, genMipmapSave, and swizzle all came from the texture object
passed into the function. This may not be the texture bound to
ctx->Texture.CurrentUnit when the function is called!
We need a simple test case to verify this bug.
1. Create two textures, A and B, and fill each with some data.
2. Bind A and set GL_TEXTURE_MAX_LEVEL, GL_GENERATE_MIPMAP, and
GL_TEXTURE_SWIZZLE_RGBA (assuming either GL_EXT_texture_swizzle or
GL_ARB_texture_swizzle is supported).
3. While A is bound (but B is not bound), call glGenerateMipmaps on B.
4. Verify the GL_TEXTURE_MAX_LEVEL, GL_GENERATE_MIPMAP, and
GL_TEXTURE_SWIZZLE_RGBA state of A.
It may be worth making this test generic so that other meta operations (and
other texture state) could be tested in the future.</pre>
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