glPolygonMode - select a polygon rasterization mode
void glPolygonMode(GLenum face, GLenum mode);
glPolygonMode controls the interpretation of polygons for rasterization. face describes which polygons mode applies to: both front and back-facing polygons (GL_FRONT_AND_BACK). The polygon mode affects only the final rasterization of polygons. In particular, a polygon's vertices are lit and the polygon is clipped and possibly culled before these modes are applied.
Three modes are defined and can be specified in mode:
To draw a surface with outlined polygons, call
Vertices are marked as boundary or nonboundary with an edge flag. Edge flags are generated internally by the GL when it decomposes triangle stips and fans.
GL_INVALID_ENUM is generated if either face or mode is not an accepted value.
glGet() with argument GL_POLYGON_MODE
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