Bug 102634

Created attachment 134107 [details]
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: https://github.com/Themaister/Granite/blob/master/assets/shaders/inc/render_target.h#L8

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: https://github.com/Themaister/Granite
Run Suzanne model: ./granite/tests/gltf-viewer ~/git/glTF-Sample-Models/2.0/Suzanne/glTF/Suzanne.gltf

Fiddle with WORKAROUND_RADV define mentioned above: