TSL: Introduce premultipliedGaussianBlur
#29604
Merged
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Related issue: #29597 (comment)
Description
Gaussian blurs commonly used in shaders is different from other gaussian blurs used in image editing software, where the alpha is premultiplied. This is very useful for blurring transparent textures when you don't want to consider the non-transparent part of the image as you would with the traditional method.