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# Objective - Fixes #16078 ## Solution - Rename things to clarify that we _want_ unclipped depth for directional light shadow views, and need some way of disabling the GPU's builtin depth clipping - Use DEPTH_CLIP_CONTROL instead of the fragment shader emulation on supported platforms - Pass only the clip position depth instead of the whole clip position between vertex->fragment shader (no idea if this helps performance or not, compiler might optimize it anyways) - Meshlets - HW raster always uses DEPTH_CLIP_CONTROL since it targets a more limited set of platforms - SW raster was not handling DEPTH_CLAMP_ORTHO correctly, it ended up pretty much doing nothing. - This PR made me realize that SW raster technically should have depth clipping for all views that are not directional light shadows, but I decided not to bother writing it. I'm not sure that it ever matters in practice. If proven otherwise, I can add it. ## Testing - Did you test these changes? If so, how? - Lighting example. Both opaque (no fragment shader) and alpha masked geometry (fragment shader emulation) are working with depth_clip_control, and both work when it's turned off. Also tested meshlet example. - Are there any parts that need more testing? - Performance. I can't figure out a good test scene. - How can other people (reviewers) test your changes? Is there anything specific they need to know? - Toggle depth_clip_control_supported in prepass/mod.rs line 323 to turn this PR on or off. - If relevant, what platforms did you test these changes on, and are there any important ones you can't test? - Native --- ## Migration Guide - `MeshPipelineKey::DEPTH_CLAMP_ORTHO` is now `MeshPipelineKey::UNCLIPPED_DEPTH_ORTHO` - The `DEPTH_CLAMP_ORTHO` shaderdef has been renamed to `UNCLIPPED_DEPTH_ORTHO_EMULATION` - `clip_position_unclamped: vec4<f32>` is now `unclipped_depth: f32` |
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Bevy PBR
