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POLYTYPE_GRGB - Polygon rendering mode type Allegro game programming library.
A gouraud shaded polygon which interpolates RGB triplets rather than a single
color. In 256-color modes this uses the global rgb_map table to convert the
result to an 8-bit paletted color, so it must only be used after you have set
up the RGB mapping table! The colors for each vertex are taken from the `c'
value, which is interpreted as a 24-bit RGB triplet (0xFF0000 is red, 0x00FF00
is green, and 0x0000FF is blue).
polygon3d(3alleg4), rgb_map(3alleg4), ex3d(3alleg4)