HP Workstation zx2000 OpenGL 1.1 Reference for HP-UX 11.x - Page 131

Chapter 5 E glEnable glEnable glEnable, glDisable: enable or disable server-side GL capabilities. C Specification void glEnable( GLenum cap) void glDisable( GLenum cap) Parameters cap Specifies a symbolic constant indicating a GL capability. Description glEnable and glDisable enable and disable various capabilities. Use glIsEnabled or glGet to determine the current setting of any capability. The initial value for each capability with the exception of GL_DITHER is GL_FALSE. The initial value for GL_DITHER is GL_TRUE. Both glEnable and glDisable take a single argument, cap, which can assume one of the following values: GL_ALPHA_TEST If enabled, do alpha testing. See glAlphaFunc. GL_AUTO_NORMAL If enabled, generate normal vectors when either GL_MAP2_VERTEX_3 or GL_MAP2_VERTEX_4 is used to generate vertices. See glMap2. GL_BLEND If enabled, blend the incoming RGBA color values with the values in the color buffers. See glBlendFunc. GL_CLIP_PLANEi If enabled, clip geometry against user-defined clipping plane i. See glClipPlane. GL_COLOR_LOGIC_OP If enabled, apply the currently selected logical operation to the incoming RGBA color and color buffer values. See glLogicOp. GL_COLOR_MATERIAL If enabled, have one or more material parameters track the current color. See glColorMaterial. GL_CULL_FACE If enabled, cull polygons based on their winding in window coordinates. See glCullFace. GL_DEPTH_TEST 131