glIsEnabled — test whether a capability is enabled
GLboolean glIsEnabled(
|
GLenum cap) ; |
cap
Specifies a symbolic constant indicating a GL capability.
index
Specifies the index of the capability.
glIsEnabled
returns GL_TRUE
if cap
is an enabled capability
and returns GL_FALSE
otherwise. Initially all capabilities except GL_DITHER
are disabled;
GL_DITHER
is initially enabled.
The following capabilities are accepted for cap
:
Constant | See |
---|---|
GL_BLEND
|
glBlendFunc |
GL_CULL_FACE
|
glCullFace |
GL_DEPTH_TEST
|
glDepthFunc, glDepthRangef |
GL_DITHER
|
glEnable |
GL_POLYGON_OFFSET_FILL
|
glPolygonOffset |
GL_PRIMITIVE_RESTART_FIXED_INDEX
|
glEnable |
GL_RASTERIZER_DISCARD
|
glEnable |
GL_SAMPLE_ALPHA_TO_COVERAGE
|
glSampleCoverage |
GL_SAMPLE_COVERAGE
|
glSampleCoverage |
GL_SCISSOR_TEST
|
glScissor |
GL_STENCIL_TEST
|
glStencilFunc, glStencilOp |
If an error is generated,
glIsEnabled
returns GL_FALSE
.
GL_INVALID_ENUM
is generated if cap
is not an accepted value.
OpenGL ES API Version | |||
---|---|---|---|
Function Name | 2.0 | 3.0 | 3.1 |
glIsEnabled | ✔ | ✔ | ✔ |
Copyright © 1991-2006 Silicon Graphics, Inc. Copyright © 2010-2014 Khronos Group. This document is licensed under the SGI Free Software B License. For details, see https://khronos.org/registry/OpenGL-Refpages/LICENSES/LicenseRef-FreeB.txt.