Document begin_render_pass usage patterns in wgpu-gpu tests

[Copilot]

Connections
Research task to analyze begin_render_pass usage patterns across the wgpu-gpu test suite.

Description
Analyzed all 26 test files in tests/tests/wgpu-gpu/** that use begin_render_pass to document test patterns and what each test verifies.

Key test categories found:

• Multiview/Multisampling: multiview/, transient.rs, render_target.rs - rendering to texture arrays, MSAA resolve, 3D views
• Texture lifecycle: zero_init_texture_after_discard.rs - discard behavior resets init state
• Resource ownership: render_pass_ownership.rs, mem_leaks.rs - resources can be dropped after passing to render pass
• Shader features: shader_primitive_index/, shader_barycentric/, clip_distances.rs, push_constants.rs
• Binding arrays: binding_array/sampled_textures.rs - non-uniform indexing into texture arrays
• Query support: occlusion_query/ - depth-based visibility queries
• Draw call variants: draw_indirect.rs, vertex_indices/ - indirect draws, indexed draws, instancing
• Vertex formats: vertex_formats/, vertex_state.rs - format pass-through, stride=0 handling
• Scissor/Viewport: scissor_tests/ - clipping rectangles
• Regression tests: regression/issue_*.rs - FXC switch bugs, GL attribute reset, multi-stage bindings
• Advanced features: mesh_shader/, planar_texture/ - mesh shaders, NV12/P010 formats

No code changes - documentation/research only.

Testing
N/A - analysis task, no code modifications.

Squash or Rebase?
N/A - no commits.

Checklist

• Run cargo fmt.
• Run taplo format.
• Run cargo clippy --tests. If applicable, add:
  • --target wasm32-unknown-unknown
• Run cargo xtask test to run tests.
• If this contains user-facing changes, add a CHANGELOG.md entry.

Original prompt

I want you to look for all the usages of "begin_render_pass" in tests/tests/wgpu-gpu/** and for each usage, I want you to look at the test code that invokes a render pass, and summarize how that test works and what it's testing.

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.