Support WebGL2 with fallback to WebGL1 #14377
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This reverts commit dc418b6.
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Attempt to support WebGL2 with fallback to WebGL1 using a version uniform. Potential alternative to #14366
A consequence of using WebGL2 is that styles (even the default RGBA style) should not reference bands beyond the bandCount. Two band (or single band GeoTIFF with alpha added) sources will need an explicit style. The cog-blob example demonstrates compatibility on systems with and without WebGL2, although a forced WebGL test is still needed.