Improve ShaderLab's compatiblity with the RenderState of Material

[Sway007]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

When no RenderState is specified in ShaderLab, render pipeline use the RenderState setting of Material, instead of using a default RenderState.

What is the current behavior? (You can also link to an open issue here)

Runtime will render a material whose shader created by ShaderLab with a default RenderState even if no RenderState is specified in ShaderLab, instead of with the RenderState setting from Material.

Summary by CodeRabbit

• New Features

  • Enhanced efficiency in shader rendering by optimizing the instantiation of render states.

• Bug Fixes

  • Prevented unnecessary creation of render state objects when no relevant data is present, improving performance.

[coderabbitai]

Walkthrough

The changes in the Shader.ts file involve a restructuring of how render states are handled within the Shader class. The implementation now includes a conditional check to determine if constantMap or variableMap has entries before creating a new RenderState object. This adjustment prevents unnecessary instantiation and processing when there are no render states to apply.

Changes

Files	Change Summary
packages/core/src/shader/Shader.ts	Restructured logic for rendering states; added condition to create RenderState only if necessary.

Possibly related PRs

• Enhance ShaderLab documents #2331: This PR involves optimizations in Shader.ts related to rendering states, while also enhancing documentation about ShaderLab, sharing a context of rendering states.

🐇 In the shader's realm, where states do play,
A check was added to brighten the way.
No more waste, just pure delight,
Rendering smoothly, a beautiful sight.
Hooray for the changes, let’s hop and cheer,
For optimized shaders, we hold so dear! 🌟

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Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between 98de462 and c419fe6.

Files selected for processing (1)

• packages/core/src/shader/Shader.ts (1 hunks)

Additional comments not posted (1)

packages/core/src/shader/Shader.ts (1)

115-130: LGTM!

The code segment introduces an optimization by checking for the presence of constant or variable render states before creating and processing the RenderState object. This avoids unnecessary object creation and processing when no render states are defined.

The destructuring of constantMap and variableMap improves code readability, and the logic for applying constant render states and parsing variable render states remains functionally correct within the conditional block.

Overall, the changes enhance the efficiency and clarity of the render state handling logic.

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