[Bf-blender-cvs] [51914d4a4ad] blender-v3.4-release: Fix T100530: Drawing arifacts Volume/AMD.

[Jeroen Bakker]

Commit: 51914d4a4ada5288d8ab30330e707f72d1073d1d
Author: Jeroen Bakker
Date:   Wed Nov 16 12:53:10 2022 +0100
Branches: blender-v3.4-release
https://developer.blender.org/rB51914d4a4ada5288d8ab30330e707f72d1073d1d

Fix T100530: Drawing arifacts Volume/AMD.

Missing initialization of global shader variable.
Most drivers initialize these by them selves, but not all of them.

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M	source/blender/draw/engines/eevee/shaders/volumetric_frag.glsl

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diff --git a/source/blender/draw/engines/eevee/shaders/volumetric_frag.glsl b/source/blender/draw/engines/eevee/shaders/volumetric_frag.glsl
index 90c36801dd5..a98ff4b1842 100644
--- a/source/blender/draw/engines/eevee/shaders/volumetric_frag.glsl
+++ b/source/blender/draw/engines/eevee/shaders/volumetric_frag.glsl
@@ -20,7 +20,7 @@ layout(location = 1) out vec4 volumeExtinction;
 layout(location = 2) out vec4 volumeEmissive;
 layout(location = 3) out vec4 volumePhase;
 
-int attr_id;
+int attr_id = 0;
 
 #ifndef CLEAR
 GlobalData init_globals(void)