glIsEnabled

NAME

glIsEnabled -- test whether a capability is enabled

C SPECIFICATION

GLboolean glIsEnabled(GLenum cap)

PARAMETERS

cap: Specifies a symbolic constant indicating a GL capability.

DESCRIPTION

glIsEnabled returns GL_TRUE if cap is an enabled capability and returns GL_FALSE otherwise. The following capabilities are accepted for cap:

GL_ALPHA_TEST: see glAlphaFunc.
GL_AUTO_NORMAL: see glEvalCoord.
GL_BLEND: see glBlendFunc.
GL_CLIP_PLANEi: see glClipPlane.
GL_COLOR_MATERIAL: see glColorMaterial.
GL_CULL_FACE: see glCullFace.
GL_DEPTH_TEST: see glDepthFunc and glDepthRange.
GL_DITHER: see glEnable.
GL_FOG: see glFog.
GL_LIGHTi: see glLightModel and glLight.
GL_LIGHTING: see glMaterial, glLightModel, and glLight.
GL_LINE_SMOOTH: see glLineWidth.
GL_LINE_STIPPLE: see glLineStipple.
GL_LOGIC_OP: see glLogicOp.
GL_MAP1_COLOR_4: see glMap1.
GL_MAP1_INDEX: see glMap1.
GL_MAP1_NORMAL: see glMap1.
GL_MAP1_TEXTURE_COORD_1: see glMap1.
GL_MAP1_TEXTURE_COORD_2: see glMap1.
GL_MAP1_TEXTURE_COORD_3: see glMap1.
GL_MAP1_TEXTURE_COORD_4: see glMap1.
GL_MAP1_VERTEX_3: see glMap1.
GL_MAP1_VERTEX_4: see glMap1.
GL_MAP2_COLOR_4: see glMap2.
GL_MAP2_INDEX: see glMap2.
GL_MAP2_NORMAL: see glMap2.
GL_MAP2_TEXTURE_COORD_1: see glMap2.
GL_MAP2_TEXTURE_COORD_2: see glMap2.
GL_MAP2_TEXTURE_COORD_3: see glMap2.
GL_MAP2_TEXTURE_COORD_4: see glMap2.
GL_MAP2_VERTEX_3: see glMap2.
GL_MAP2_VERTEX_4: see glMap2.
GL_NORMALIZE: see glNormal.
GL_POINT_SMOOTH: see glPointSize.
GL_POLYGON_SMOOTH: see glPolygonMode.
GL_POLYGON_STIPPLE: see glPolygonStipple.
GL_SCISSOR_TEST: see glScissor.
GL_STENCIL_TEST: see glStencilFunc and glStencilOp.
GL_TEXTURE_1D: see glTexImage1D.
GL_TEXTURE_2D: see glTexImage2D.
GL_TEXTURE_GEN_Q: see glTexGen.
GL_TEXTURE_GEN_R: see glTexGen.
GL_TEXTURE_GEN_S: see glTexGen.
GL_TEXTURE_GEN_T: see glTexGen.

NOTES

If an error is generated, glIsEnabled returns zero.

ERRORS

GL_INVALID_ENUM is generated if cap is not an accepted value.

GL_INVALID_OPERATION is generated if glIsEnabled is called between a call to glBegin and the corresponding call to glEnd.