#version 430 core

// Campaign V slice V6l. Depth-only: the pipeline masks colour off
// (GpuPipelineDescription.ColorWrite = false), which is what "COLOR-INVISIBLE
// triangle fan" means in retail's DrawPortalPolyInternal.
//
// Vulkan needs a fragment stage even when nothing is written — a graphics
// pipeline with no fragment shader requires VK_EXT_shader_object or a
// rasterizer-discard pipeline, neither of which is what this draw is. An empty
// main() with the colour mask off is the same thing the GL arm has always done.

void main() { }