glBegin
2017-2-4 · mode. Specifies the primitive or primitives that will be created from vertices presented between glBegin and the subsequent glEnd.Ten symbolic constants are accepted: GL_POINTS, GL_LINES, GL_LINE_STRIP, GL_LINE_LOOP, GL_TRIANGLES, GL_TRIANGLE_STRIP, GL_TRIANGLE_FAN, GL_QUADS, GL_QUAD_STRIP, and GL_POLYGON.