Puts a polygon in the scene rendering list.
Puts a polygon in the rendering list. Nothing is really rendered at this
moment. Should be called between clear_scene() and render_scene().
Arguments are the same as for polygon3d(), except the bitmap is missing.
The one passed to clear_scene() will be used.
Unlike polygon3d(), the polygon may be concave or self-intersecting.
Shapes that penetrate one another may look OK, but they are not really
handled by this code.
Note that the texture is stored as a pointer only, and you should keep
the actual bitmap around until render_scene(), where it is used.
Since the FLAT style is implemented with the low-level hline() funtion,
the FLAT style is subject to DRAW_MODEs. All these modes are valid. Along
with the polygon, this mode will be stored for the rendering moment, and
also all the other related variables (color_map pointer, pattern pointer,
anchor, blender values).
The settings of the CPU_MMX and CPU_3DNOW flags of the cpu_capabilities
global variable on entry in this routine affect the choice of low-level
asm routine that will be used by render_scene() for this polygon.
Returns zero on success, or a negative number if it won't be rendered for
lack of a rendering routine.
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