I checked other branches of drv_epic.h on GitHub, and none of them support DRV_EPIC_DRAW_POLYGON. Does this mean that to use this feature, I must use the SDK version v2.4.0 from the main trunk?
Yes. The DRV_EPIC_DRAW_POLYGON feature is indeed only available in the main branch version of the SDK; other branch versions do not support this feature. If you need to use the polygon drawing function, it is recommended to switch to version v2.4.0 or a newer main branch version.
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