4018e52d30
OpenGL & Vulkan has workarounds when gl_Layer/gl_ViewportIndex isn't supported. In this case a geometry shader will is generated. This geometry shader doesn't follow the GLSL standard and doesn't work on some platforms. This has not been an issue as the platforms that don't support gl_Layer/gl_ViewportIndex don't show the issue. According to the specs gl_Layer and gl_ViewportIndex should be set for each call to EmitVertex. A shader should not rely on that EmitVertex reuses the same memory. Ref https://www.khronos.org/opengl/wiki/Geometry_Shader#Layered_rendering ``` Warning: gl_Layer and gl_ViewportIndex are GS output variables. As such, every time you call EmitVertex, their values will become undefined. Therefore, you must set these variables every time you loop over outputs. ``` Issue detected during development of !129062 Pull Request: https://projects.blender.org/blender/blender/pulls/130506
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