Attempt to reduce linking overhead (Scala Native) and improve pipeline performance

[davesmith00000]

This is going to be another stage in the work to make Scala Native viable. Currently the JVM and JS compilation of the pipeline works just fine, since the don't do full ahead-of-time linking. Unfortunately Scala Native does do that, and blows up.

The general plan here is quite simple:

1. Refactor, reorganise, and tidy up the indigo-render-pipeline module.
2. Make it procedural.

• Switch the mutable structures to reduce allocations.
• Remove as many lambdas as possible.
• Reduce as far as possible, matching on the SceneNode types (get as concrete as possible as fast as possible).

[Copilot]

Pull request overview

Refactors the Indigo render pipeline to be more procedural and allocation-conscious (motivated by Scala Native’s AOT linking costs), while reorganizing pipeline types/utilities into clearer subpackages and introducing a visitor-based traversal for SceneNodes.

Changes:

• Adds SceneNodeVisitor + SceneNode.accept and implements accept across core scenegraph node types.
• Reorganizes render-pipeline packages (assets/, datatypes/, sceneprocessing/, displayprocessing/) and updates imports across renderer/platform code.
• Introduces new procedural utilities/builders (e.g., light UBO builder, UBO packing, layer compaction) and adds targeted MUnit test coverage.

Reviewed changes

Copilot reviewed 65 out of 65 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
indigo-scenegraph/src/indigo/scenegraph/Text.scala	Adds accept implementation for visitor traversal.
indigo-scenegraph/src/indigo/scenegraph/Sprite.scala	Adds accept implementation for visitor traversal.
indigo-scenegraph/src/indigo/scenegraph/Shape.scala	Adds accept implementations for concrete shape variants.
indigo-scenegraph/src/indigo/scenegraph/SceneNodeVisitor.scala	Introduces visitor interface for scenegraph node processing.
indigo-scenegraph/src/indigo/scenegraph/SceneNode.scala	Adds accept to SceneNode and default visitor hook for EntityNode.
indigo-scenegraph/src/indigo/scenegraph/Mutants.scala	Adds accept implementation for visitor traversal.
indigo-scenegraph/src/indigo/scenegraph/Group.scala	Adds accept implementation for visitor traversal.
indigo-scenegraph/src/indigo/scenegraph/Graphic.scala	Adds accept implementation for visitor traversal.
indigo-scenegraph/src/indigo/scenegraph/CloneTiles.scala	Adds accept implementation for visitor traversal.
indigo-scenegraph/src/indigo/scenegraph/CloneBatch.scala	Adds accept implementation for visitor traversal.
indigo-scenegraph/src/indigo/scenegraph/Clip.scala	Adds accept implementation for visitor traversal.
indigo-scenegraph/src/indigo/scenegraph/BlankEntity.scala	Adds accept implementation for visitor traversal.
indigo-render/src/indigo/render/Renderer.scala	Updates imports to new render-pipeline datatypes package.
indigo-render/src-js/indigo/render/webgl2/TextureLookupResult.scala	Updates AtlasId import to new assets package.
indigo-render/src-js/indigo/render/webgl2/RendererWebGL2.scala	Updates imports to new render-pipeline datatypes package.
indigo-render/src-js/indigo/render/webgl2/LoadedTextureAsset.scala	Updates AtlasId import to new assets package.
indigo-render/src-js/indigo/render/webgl2/LayerRenderer.scala	Updates display type imports to new datatypes/assets packages.
indigo-render/src-js/indigo/render/webgl2/LayerMergeRenderer.scala	Updates uniform-data type import to new datatypes package.
indigo-render-pipeline/test/src/indigo/render/pipeline/sceneprocessing/utils/CompactLayersTests.scala	Adds tests for new layer-compaction utility.
indigo-render-pipeline/test/src/indigo/render/pipeline/sceneprocessing/utils/BuildLightingDataTests.scala	Adds tests for new light-UBO builder logic and edge cases.
indigo-render-pipeline/test/src/indigo/render/pipeline/sceneprocessing/SceneProcessorTests.scala	Adds tests for new procedural SceneProcessor.makeDisplayLayers.
indigo-render-pipeline/test/src/indigo/render/pipeline/displayprocessing/utils/TextConversionTests.scala	Adds tests for text character layout logic.
indigo-render-pipeline/test/src/indigo/render/pipeline/displayprocessing/PackUBOsTests.scala	Adds detailed std140 UBO packing tests.
indigo-render-pipeline/test/src/indigo/render/pipeline/displayprocessing/DisplayObjectConversionsTests.scala	Adds tests for new DisplayObjectConversions behavior.
indigo-render-pipeline/test/src/indigo/render/pipeline/datatypes/SpriteSheetFrameTests.scala	Moves + expands SpriteSheetFrame tests for new datatypes location.
indigo-render-pipeline/test/src/indigo/render/pipeline/SceneProcessorTests.scala	Removes legacy scene processor tests (split into new focused suites).
indigo-render-pipeline/test/src/indigo/render/pipeline/DisplayObjectConversionsTests.scala	Removes legacy conversions tests (split into new focused suites).
indigo-render-pipeline/test/src-jvm/indigo/render/pipeline/displayprocessing/utils/ToCacheKeySyntaxTests.scala	Adds JVM test for shader cache-key generation.
indigo-render-pipeline/test/src-js/indigo/render/pipeline/displayprocessing/utils/ToCacheKeySyntaxTests.scala	Adds JS test for shader cache-key generation.
indigo-render-pipeline/src/indigo/render/pipeline/sceneprocessing/utils/MergeUniformData.scala	Extracts shader→uniform-data merge into utility.
indigo-render-pipeline/src/indigo/render/pipeline/sceneprocessing/utils/CompactLayers.scala	Extracts layer compaction into utility.
indigo-render-pipeline/src/indigo/render/pipeline/sceneprocessing/utils/BuildLightingData.scala	Adds procedural light packing into std140-friendly float array.
indigo-render-pipeline/src/indigo/render/pipeline/sceneprocessing/SceneProcessor.scala	Introduces new procedural scene processing pipeline entrypoint.
indigo-render-pipeline/src/indigo/render/pipeline/sceneprocessing/LightDataBuilder.scala	Adds mutable-array builder for lighting UBO data.
indigo-render-pipeline/src/indigo/render/pipeline/displayprocessing/utils/ToCacheKeySyntax.scala	Introduces shader-data cache-key builder.
indigo-render-pipeline/src/indigo/render/pipeline/displayprocessing/utils/TextureLookups.scala	Extracts cached texture lookup/offset helpers.
indigo-render-pipeline/src/indigo/render/pipeline/displayprocessing/utils/TextConversion.scala	Adds procedural text→display conversion + caching.
indigo-render-pipeline/src/indigo/render/pipeline/displayprocessing/utils/SpriteConversion.scala	Adds procedural sprite→display conversion + caching.
indigo-render-pipeline/src/indigo/render/pipeline/displayprocessing/utils/ShapeConversion.scala	Adds procedural shape→display conversion.
indigo-render-pipeline/src/indigo/render/pipeline/displayprocessing/utils/PackUBOs.scala	Adds procedural std140 UBO packing implementation.
indigo-render-pipeline/src/indigo/render/pipeline/displayprocessing/utils/MutantConversion.scala	Adds procedural mutants→display conversion.
indigo-render-pipeline/src/indigo/render/pipeline/displayprocessing/utils/GroupConversion.scala	Adds procedural group→matrix conversion.
indigo-render-pipeline/src/indigo/render/pipeline/displayprocessing/utils/GraphicConversion.scala	Adds procedural graphic→display conversion + caching.
indigo-render-pipeline/src/indigo/render/pipeline/displayprocessing/utils/EntityNodeConversion.scala	Adds procedural entity-node→display conversion + caching.
indigo-render-pipeline/src/indigo/render/pipeline/displayprocessing/utils/ConversionHelpers.scala	Centralizes shader uniform-block conversion to display uniform data.
indigo-render-pipeline/src/indigo/render/pipeline/displayprocessing/utils/CloneTilesConversion.scala	Adds cached conversion for clone-tiles display entities.
indigo-render-pipeline/src/indigo/render/pipeline/displayprocessing/utils/CloneBatchConversion.scala	Adds cached conversion for clone-batch display entities.
indigo-render-pipeline/src/indigo/render/pipeline/displayprocessing/DisplayObjectConversions.scala	Introduces frame/asset scoped caches + visitor-based conversion pipeline.
indigo-render-pipeline/src/indigo/render/pipeline/displayprocessing/DisplayObjectConversionVisitor.scala	Implements SceneNodeVisitor for display conversion.
indigo-render-pipeline/src/indigo/render/pipeline/display/SpriteSheetFrame.scala	Removes legacy SpriteSheetFrame location.
indigo-render-pipeline/src/indigo/render/pipeline/datatypes/SpriteSheetFrame.scala	Adds new datatypes SpriteSheetFrame implementation.
indigo-render-pipeline/src/indigo/render/pipeline/datatypes/ProcessedSceneData.scala	Moves ProcessedSceneData to datatypes package.
indigo-render-pipeline/src/indigo/render/pipeline/datatypes/DisplayLayer.scala	Moves DisplayLayer to datatypes package.
indigo-render-pipeline/src/indigo/render/pipeline/datatypes/DisplayEntity.scala	Refactors display entity structures and constructors.
indigo-render-pipeline/src/indigo/render/pipeline/assets/TextureRefAndOffset.scala	Moves TextureRefAndOffset to assets package.
indigo-render-pipeline/src/indigo/render/pipeline/assets/AtlasId.scala	Moves AtlasId to assets package.
indigo-render-pipeline/src/indigo/render/pipeline/assets/AssetMapping.scala	Moves AssetMapping to assets package.
indigo-render-pipeline/src/indigo/render/pipeline/SceneProcessor.scala	Removes legacy SceneProcessor implementation.
indigo-render-pipeline/src/indigo/render/pipeline/DisplayObjectConversions.scala	Removes legacy DisplayObjectConversions implementation.
indigo-platform/test/src-js/indigo/platform/assets/TextureAtlasTests.scala	Updates AtlasId import to new assets package.
indigo-platform/src-js/indigo/platform/gameengine/GameLoop.scala	Updates SceneProcessor import to new sceneprocessing package.
indigo-platform/src-js/indigo/platform/gameengine/GameEngine.scala	Updates AssetMapping/SceneProcessor imports to new packages.
indigo-platform/src-js/indigo/platform/assets/TextureAtlas.scala	Updates AtlasId import to new assets package.
indigo-platform/src-js/indigo/platform/JsPlatform.scala	Updates pipeline asset type imports to new assets package.
indigo-core/src/indigo/core/utils/QuickCache.scala	Updates Scala 3 using/given syntax for cache APIs.

Comments suppressed due to low confidence (2)

indigo-render-pipeline/src/indigo/render/pipeline/datatypes/DisplayEntity.scala:28

• DisplayGroup and DisplayTextLetters were changed from case classes to plain classes, but the code still calls DisplayGroup(...) / DisplayTextLetters(...) (e.g. in the empty values and elsewhere). Plain classes don’t get an auto-generated apply, so this won’t compile. Either switch these back to final case class, or add companion apply methods (or update all call sites to use new ...).
  indigo-render-pipeline/src/indigo/render/pipeline/datatypes/DisplayEntity.scala:141
• DisplayObjectUniformData is now a plain class, but the rest of the PR constructs it as DisplayObjectUniformData(...) (e.g. in ConversionHelpers, MergeUniformData, etc.). This won’t compile unless you either make it a case class, add a companion object DisplayObjectUniformData with an apply, or update call sites to use new DisplayObjectUniformData(...).