glIsEnabled, glIsEnabledi — test whether a capability is enabled
GLboolean glIsEnabled( | GLenum cap) ; |
GLboolean glIsEnabledi( | GLenum cap, |
GLuint index) ; |
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. Boolean states that are indexed may be tested with glIsEnabledi
.
For glIsEnabledi
, index
specifies the index of the capability to test. index
must be between zero and the count of indexed capabilities for cap
.
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, glLogicOp |
GL_CLIP_DISTANCE i
| glEnable |
GL_COLOR_LOGIC_OP
| glLogicOp |
GL_CULL_FACE
| glCullFace |
GL_DEPTH_CLAMP
| glEnable |
GL_DEBUG_OUTPUT
| glEnable |
GL_DEBUG_OUTPUT_SYNCHRONOUS
| glEnable |
GL_DEPTH_TEST
| glDepthFunc, glDepthRange |
GL_DITHER
| glEnable |
GL_FRAMEBUFFER_SRGB
| glEnable |
GL_LINE_SMOOTH
| glLineWidth |
GL_MULTISAMPLE
| glSampleCoverage |
GL_POLYGON_SMOOTH
| glPolygonMode |
GL_POLYGON_OFFSET_FILL
| glPolygonOffset |
GL_POLYGON_OFFSET_LINE
| glPolygonOffset |
GL_POLYGON_OFFSET_POINT
| glPolygonOffset |
GL_PROGRAM_POINT_SIZE
| glEnable |
GL_PRIMITIVE_RESTART
| glEnable, glPrimitiveRestartIndex |
GL_SAMPLE_ALPHA_TO_COVERAGE
| glSampleCoverage |
GL_SAMPLE_ALPHA_TO_ONE
| glSampleCoverage |
GL_SAMPLE_COVERAGE
| glSampleCoverage |
GL_SAMPLE_MASK
| glEnable |
GL_SCISSOR_TEST
| glScissor |
GL_STENCIL_TEST
| glStencilFunc, glStencilOp |
GL_TEXTURE_CUBE_MAP_SEAMLESS
| glEnable |
If an error is generated,
glIsEnabled
and glIsEnabledi
return GL_FALSE
.
GL_DEBUG_OUTPUT
and GL_DEBUG_OUTPUT_SYNCHRONOUS
are available only if the GL version is 4.3 or greater.
GL_INVALID_ENUM
is generated if cap
is not an accepted value.
GL_INVALID_VALUE
is generated by glIsEnabledi
if index
is outside the
valid range for the indexed state cap
.
Copyright © 1991-2006 Silicon Graphics, Inc. Copyright © 2010-2011 Khronos Group. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.