Opacity already includes the alpha value from the color. The batcher2d's walk function implements the calculation of opacity.

[bofeng-song]

Re: #
#16960
#17497
#16601

Changelog

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Continuous Integration

This pull request:

• needs automatic test cases check.

  Manual trigger with @cocos-robot run test cases afterward.

• does not change any runtime related code or build configuration

  If any reviewer thinks the CI checks are needed, please uncheck this option, then close and reopen the issue.

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Compatibility Check

This pull request:

• changes public API, and have ensured backward compatibility with deprecated features.
• affects platform compatibility, e.g. system version, browser version, platform sdk version, platform toolchain, language version, hardware compatibility etc.
• affects file structure of the build package or build configuration which requires user project upgrade.
• introduces breaking changes, please list all changes, affected features and the scope of violation.

Greptile Summary

The PR modifies the opacity calculation in the cacheTraverse function of simple.ts and the Skeleton class within skeleton.ts to use the node's opacity directly. This change affects how the final vertex colors are computed, ensuring consistency with the Web's opacity calculation.

• native/cocos/editor-support/spine-creator-support/SkeletonCacheAnimation.cpp: Updated handleColor function to derive opacity directly from the entity's opacity.
• native/cocos/editor-support/spine-creator-support/SkeletonRenderer.cpp: Modified render function to use only the skeleton's color alpha, slot's color alpha, and entity's opacity for final alpha value.
• platforms/native/engine/jsb-spine-skeleton.js: Updated _updateColor method to include node's local opacity directly in the color update process.

Ensure these changes do not introduce rendering issues, especially where both node's opacity and color alpha values are used.

[greptile-apps]

LGTM

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[bofeng-song]

Opacity has been contained color's alpha

[github-actions]

Interface Check Report

This pull request does not change any public interfaces !

[greptile-apps]

LGTM

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