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add CacheBuilder.align_4x4 option

Scott J Maddox requested to merge scottjmaddox/rusttype:gpu_cache_align_4x4 into master

If your backend requires texture updates to be aligned to 4x4 texel boundaries (e.g. WebGL), this option should be set to true.

Without this option, the gpu cache does not properly work on WebGL. The three major browser all give errors when trying to update the texture with texSubImage2D:

  • Firefox: Error: WebGL warning: texSubImage2D: Desired upload requires more data than is available: (34 rows plus 9 pixels needed, 26 rows plus 3 pixels available)
  • Chrome: WebGL: INVALID_OPERATION: texSubImage2D: ArrayBufferView not big enough for request
  • Safari: WebGL: INVALID_OPERATION: texSubImage2D: ArrayBufferView not big enough for request

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