For registers such as Texture sampler registers,
if we upload one texture without alpha channel by uploadFromByteArray,and setTextureAt fs0,then
tex ft0, v0, fs0 <2d, linear, nomip>
What is the value for ft0.w?Does it have a default value 1.0?
For registers such as Attribute registers,
the same question is there for va0.w etc.
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