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GLPOLYGONMODE() GLPOLYGONMODE() NAME glPolygonMode - select a polygon rasterization mode C SPECIFICATION void glPolygonMode( GLenum face, GLenum mode ) PARAMETERS face Specifies the polygons that mode applies to. Must be GL_FRONT for front-facing polygons, GL_BACK for back-facing polygons, or GL_FRONT_AND_BACK for front- and back-facing polygons. mode Specifies how polygons will be rasterized. Accepted values are GL_POINT, GL_LINE, and GL_FILL. The initial value is GL_FILL for both front- and back-facing polygons. DESCRIPTION glPolygonMode controls the interpretation of polygons for rasteriza- tion. face describes which polygons mode applies to: front-facing polygons (GL_FRONT), back-facing polygons (GL_BACK), or both (GL_FRONT_AND_BACK). The polygon mode affects only the final rasteri- zation of polygons. In particular, a polygon's vertices are lit and the polygon is clipped and possibly culled before these modes are ap- plied. Three modes are defined and can be specified in mode: GL_POINT Polygon vertices that are marked as the start of a bound- ary edge are drawn as points. Point attributes such as GL_POINT_SIZE and GL_POINT_SMOOTH control the rasteriza- tion of the points. Polygon rasterization attributes other than GL_POLYGON_MODE have no effect. GL_LINE Boundary edges of the polygon are drawn as line segments. They are treated as connected line segments for line stippling; the line stipple counter and pattern are not reset between segments (see glLineStipple). Line attrib- utes such as GL_LINE_WIDTH and GL_LINE_SMOOTH control the rasterization of the lines. Polygon rasterization at- tributes other than GL_POLYGON_MODE have no effect. GL_FILL The interior of the polygon is filled. Polygon attrib- utes such as GL_POLYGON_STIPPLE and GL_POLYGON_SMOOTH control the rasterization of the polygon. EXAMPLES To draw a surface with filled back-facing polygons and outlined front- facing polygons, call glPolygonMode(GL_FRONT, GL_LINE); NOTES Vertices are marked as boundary or nonboundary with an edge flag. Edge flags are generated internally by the GL when it decomposes polygons; they can be set explicitly using glEdgeFlag. ERRORS GL_INVALID_ENUM is generated if either face or mode is not an accepted value. GL_INVALID_OPERATION is generated if glPolygonMode is executed between the execution of glBegin and the corresponding execution of glEnd. ASSOCIATED GETS glGet with argument GL_POLYGON_MODE SEE ALSO glBegin, glEdgeFlag, glLineStipple, glLineWidth, glPointSize, glPoly- gonStipple GLPOLYGONMODE()
NAME | C SPECIFICATION | PARAMETERS | DESCRIPTION | EXAMPLES | NOTES | ERRORS | ASSOCIATED GETS | SEE ALSO
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