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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 - 0 Color write masks with multiple render targets redirects color outputs to wrong attachment"
href="https://bugs.freedesktop.org/show_bug.cgi?id=102634">102634</a>
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<th>Summary</th>
<td>0 Color write masks with multiple render targets redirects color outputs to wrong attachment
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<th>Product</th>
<td>Mesa
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<th>Version</th>
<td>17.1
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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/Vulkan/radeon
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<th>Assignee</th>
<td>mesa-dev@lists.freedesktop.org
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<th>Reporter</th>
<td>maister@archlinux.us
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<th>QA Contact</th>
<td>mesa-dev@lists.freedesktop.org
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=134107" name="attach_134107" title="Expected output">attachment 134107</a> <a href="attachment.cgi?id=134107&action=edit" title="Expected output">[details]</a></span>
Expected output
Hardware: RX 470
Mesa: 17.1.8
OS: Arch Linux
I have a deferred shader which emits color data to 4 attachments. When
colorWriteMask of all attachments are 0xf, this works as expected, but when I
try to mask out writes to layout(location = 0), it is almost as if all the
attachments are reshuffled so that location = 1 writes to attachment 0,
location = 2 writes to attachment = 1 ... and so on.
Here is the current workaround I must apply:
<a href="https://github.com/Themaister/Granite/blob/master/assets/shaders/inc/render_target.h#L8">https://github.com/Themaister/Granite/blob/master/assets/shaders/inc/render_target.h#L8</a>
The scenario which fails:
- 4 color attachments in a subpass
- Color masks are {0, 0xf, 0xf, 0xf}
- The shader does not declare layout(location = 0) output
To reproduce:
Build Granite: <a href="https://github.com/Themaister/Granite">https://github.com/Themaister/Granite</a>
Run Suzanne model: ./granite/tests/gltf-viewer
~/git/glTF-Sample-Models/2.0/Suzanne/glTF/Suzanne.gltf
Fiddle with WORKAROUND_RADV define mentioned above:</pre>
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