using cli for transform jpg/png to ktx2 (basis, uastc)

[arpu]

hi,

is there a sample script to use glt-tranform to transform textures (jpg/png) to ktx2 with toktx?

idea is to automatic transform textures to ktx2 normalmaps, baseColor,...

[donmccurdy]

Here's an example:

glTF-Transform/packages/cli/src/cli.ts

Lines 410 to 435 in bdbecdd

	// Texture compression.
	if (opts.textureCompress === 'ktx2') {
	const { default: encoder } = await import('sharp');
	const slotsUASTC = micromatch.makeRe(
	'{normalTexture,occlusionTexture,metallicRoughnessTexture}',
	MICROMATCH_OPTIONS,
	);
	transforms.push(
	toktx({
	encoder,
	resize: [opts.textureSize, opts.textureSize],
	mode: Mode.UASTC,
	slots: slotsUASTC,
	level: 4,
	rdo: true,
	rdoLambda: 4,
	limitInputPixels: options.limitInputPixels as boolean,
	}),
	toktx({
	encoder,
	resize: [opts.textureSize, opts.textureSize],
	mode: Mode.ETC1S,
	quality: 255,
	limitInputPixels: options.limitInputPixels as boolean,
	}),
	);

The toktx() function is part of the /cli module rather than the /functions public API, because of #675, and it is possible that toktx() may have breaking changes outside of major version updates.