[Bug] Handling of clamped arrays?

[abustany]

Bug description

When creating data arrays from Uint8ClampedArray, VTK infers the texture type to be a float texture, not a UCHAR. This is (I suppose) because VtkDataTypes.UNSIGNED_CHAR is "Uint8Array", so the data type does not get properly detected when creating the texture.

Steps to reproduce

1. Create a DataArray from a Uint8ClampedArray, with some random pixel data
2. Display this data on screen (using an ImageMapper etc etc)

Detailed Behavior

getDefaultTextureInternalFormat in Rendering/OpenGL/RenderWindow.js doesn't match the data type to be uchar, and falls down to the default float case.

Expected Behavior

The OpenGL texture uses the right data type (UCHAR), that does not require the OES_texture_float_linear extension.

Environment

• vtk.js version: 29.7.0
• Browsers: Latest firefox+chrome
• OS: Linux

[finetjul]

@sedghi @bruyeret @sankhesh

[longuto]

How to correct this issue? When using volume rendering, it appears on the Android mobile browser.