feat(renderer): implement per-polygon fills for 2D shape #7722

[LalitNarayanYadav]

Description

This PR implements per-polygon coloring support for 2D shape primitives to match WebGL behavior where possible.

Changes

• Added per-polygon color support for:
  • TRIANGLES
  • TRIANGLE_STRIP
  • QUADS
  • QUAD_STRIP
• Fixed vertex winding order in strip primitives
• Replaced indirect color setting via pInst with direct renderer methods
• Maintained all existing functionality
• Optimized path handling

Testing

Verified rendering behavior matches WebGL output for:

• Gradient meshes
• Multi-colored shapes
• All primitive types
• Existing unit tests pass

Notes

While we can't achieve perfect WebGL parity (no vertex color interpolation), this provides the closest possible 2D approximation.

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[LalitNarayanYadav]

fixes #7722

[ksen0]

Hi @LalitNarayanYadav ! I'll close this PR based on the discussion in the associated issue - since a different PR on dev-2.0 branch would be needed. Thanks for working on it!

[LalitNarayanYadav]

Thank you for the feedback and clarification!
I’ll work on the dev-2.0 branch as suggested and reopen a new PR accordingly.
Appreciate the guidance!