TSL: Introduce node.toTexture() and rtt()

[sunag]

Related issue: Closes #28754. Closes #27508.

Description

This PR simplifies the creation of procedural textures and solves the problem where sampler custom shading is required in Post Processing and Materials.

Example

https://raw.githack.com/sunag/three.js/dev-rtt-node/examples/webgpu_procedural_texture.html

const uvScale = uniform( 4 );
const blurIntensity = uniform( .5 );

const procedural = checker( uv().mul( uvScale ) );
const proceduralToTexture = procedural.toTexture( 512, 512 ); // ( width, height ) <- texture size

material.colorNode = proceduralToTexture.gaussianBlur( blurIntensity, 10 );

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

Filesize dev	Filesize PR	Diff
682.2 kB (169 kB)	682.2 kB (169 kB)	+0 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

Filesize dev	Filesize PR	Diff
459.4 kB (110.9 kB)	459.4 kB (110.9 kB)	+0 B

[Mugen87]

Excited to see getTextureNode() is not required here anymore! 🙌

[Mugen87]

Nit: We should try to not add build files to the PRs.

[mrdoob]

📦 Bundle size

Full ESM build, minified and gzipped.

Filesize dev Filesize PR Diff
682.2 kB (169 kB) 682.2 kB (169 kB) +0 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

Filesize dev Filesize PR Diff
459.4 kB (110.9 kB) 459.4 kB (110.9 kB) +0 B

We should probably start tracking the size of three.webgpu.js here too 👀

[Mugen87]

We should probably start tracking the size of three.webgpu.js here too 👀

@marcofugaro Can you help us with this? There is now a separate three.js build with WebGPURenderer instead of WebGLRenderer. Ideally the report added in #25615 now honors both types of builds.

[marcofugaro]

Oh finally! Knew this day would come. Let's test tree-shaking for the WebGPURenderer!!

[sunag]

Oh finally! Knew this day would come. Let's test tree-shaking for the WebGPURenderer!!

Thanks @marcofugaro, tree-shaking is still in progress, initially here but it would be great if we could test it to check the progress of the updates.