From the readme:
Water rendering
To select water rendering mode please modify the Water section in the file conf.ini in the [Render_OpenGL] section (Water = 1 by default).
Water = 0 – Water with flat geometry (fastest).
Water = 1 – Water with flat geometry (fast).
High quality water rendering modes with correct wave geometry
Water = 2 – This mode is visually similar to water = 3 but it runs on ATI cards 9800, X800, X1800 and later models.
Water = 3 – Fast render mode with Vertex Shaders 3.0 (NVIDIA 6600 and later models)
Water = 4 – Better quality mode with Vertex Shaders 3.0 (NVIDIA 6800 and later models)
Reminder:
ATI 9500 and higher supports modes: 0, 1, 2.
NVIDIA 6600 and later models support: 0, 1, 2, 3, 4.
NVIDIA cards before the 6xxx series support: 0, 1, 2 (2 is not recommended).
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