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YGL (Yabause Graphical Library) is the video core of Yabause interfacing OpenGL. Its two main features are:

  • priority handling
  • a vdp2 cells and vdp1 textures cache

With the current structure of YGL, there's some (actually a lot of) vdp2 features that are impossible or would be very hard to implement:

  • rotation screens
  • line and vertical cell scroll
  • special priority mode 2 (per pixel)
  • a cache that can keep data between frames
  • vdp1 system/user clipping
  • vdp2 windows
  • color calculation mode 2
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