This file contains all the OpenGL extension defines required by the shadowcast example (and no other extensions). The NV_texture_rectangle extension is supported for GeForce, Quadro, and future GPUs with the Release 10 drivers (early 2001). The SGIX_shadow and SGIX_depth_texture extensions are not supported on GeForce 256, GeForce2, or Quadro GPUs but is implemented on future GPUs (early 2001).
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