Shader development with HLSL

Initial support for HLSL includes the following:

• Navigation to HLSL files.

• Syntax highlighting and highlighting for syntax errors.

• Tooltips for code elements with type information and documentation.

• Semantic code analysis checks.

• Control-flow analysis.

• A few useful inspections with quick-fixes.

• Smart suggestions in completion lists.

• Refactorings, which are experimental, but Rename, Inline Variable, Introduce Variable, and Change Signature already work for many cases.