Fixed: Use VertexOuput instead of FragmentInput in prepass.wgsl

[idobenamram]

Fix Inconsistency between VertexOutput and FragmentInput in prepass.wgsl

Objective

Fixes #9402 -
Encountered this bug:

2023-08-09T20:52:12.883651Z ERROR wgpu::backend::direct: Handling wgpu errors as fatal by default
thread 'Compute Task Pool (1)' panicked at /home/jlewis/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wgpu-0.16.3/src/backend/direct.rs:3019:5:
wgpu error: Validation Error

Caused by:
    In Device::create_render_pipeline
      note: label = `prepass_pipeline`
    Error matching ShaderStages(FRAGMENT) shader requirements against the pipeline
    Location[2] is provided by the previous stage output but is not consumed as input by this stage.


note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Encountered a panic in system `bevy_render::render_resource::pipeline_cache::PipelineCache::process_pipeline_queue_system`!
thread 'Compute Task Pool (0)' panicked at /home/jlewis/.cargo/registry/src/index.crates.io-6f17d22bba15001f/bevy_render-0.11.0/src/pipelined_rendering.rs:135:45:
called `Result::unwrap()` on an `Err` value: RecvError

The reason was that the FragmentInput in the prepass.wgsl was missing @location(2) which is the VERTEX_TANGENTS.

Solution

• Remove FragmentInput in prepass.wgsl use VertexOutput instead
• Rename VertexOutput to PrepassMeshVertexOutput
• Rename clip_position to position in PrepassMeshVertexOutput

[github-actions]

Welcome, new contributor!

Please make sure you've read our contributing guide and we look forward to reviewing your pull request shortly ✨

[superdump]

I don't want to merge this until after #9258 as that is a big PR and reworking it would be more painful than possibly reworking this one. That also touches this code and changes it a bit so we'll see how things look after that is merged.

[IceSentry]

The deferred PR partially fixed the original issue and #10105 will apply the same fix as this PR but in the context of the deferred prepass so I think we can close this. Thank you for the PR @thebeastxdxd