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138 lines
3.8 KiB
Markdown
138 lines
3.8 KiB
Markdown
**_glIsEnabled, glIsEnabledi:** test whether a capability is enabled
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## Syntax
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FUNCTION _glIsEnabled~%% (BYVAL cap AS _UNSIGNED LONG)
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GLboolean **_glIsEnabled**(GLenum cap);
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GLboolean **_glIsEnabledi**(GLenum cap, GLuint index);
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; cap
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> Specifies a symbolic constant indicating a GL capability.
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; index
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> Specifies the index of the capability.
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## Description
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**_glIsEnabled** returns [_GL_TRUE](_GL_TRUE) if cap is an enabled capability and returns [_GL_FALSE](_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](_GL_DITHER) are disabled; [_GL_DITHER](_GL_DITHER) is initially enabled.
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The following capabilities are accepted for cap:
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{|
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! **Constant**
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! **See**
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| [_GL_BLEND](_GL_BLEND)
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| [_glBlendFunc](_glBlendFunc), [_glLogicOp](_glLogicOp)
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|+
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| [_GL_CLIP_DISTANCE](_GL_CLIP_DISTANCE)*i*
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| [_glEnable](_glEnable)
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| [_GL_COLOR_LOGIC_OP](_GL_COLOR_LOGIC_OP)
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| [_glLogicOp](_glLogicOp)
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| [_GL_CULL_FACE](_GL_CULL_FACE)
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| [_glCullFace](_glCullFace)
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| [_GL_DEPTH_CLAMP](_GL_DEPTH_CLAMP)
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| [_glEnable](_glEnable)
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| [_GL_DEBUG_OUTPUT](_GL_DEBUG_OUTPUT)
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| [_glEnable](_glEnable)
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| [_GL_DEBUG_OUTPUT_SYNCHRONOUS](_GL_DEBUG_OUTPUT_SYNCHRONOUS)
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| [_glEnable](_glEnable)
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| [_GL_DEPTH_TEST](_GL_DEPTH_TEST)
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| [_glDepthFunc](_glDepthFunc), [_glDepthRange](_glDepthRange)
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| [_GL_DITHER](_GL_DITHER)
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| [_glEnable](_glEnable)
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| [_GL_FRAMEBUFFER_SRGB](_GL_FRAMEBUFFER_SRGB)
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| [_glEnable](_glEnable)
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| [_GL_LINE_SMOOTH](_GL_LINE_SMOOTH)
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| [_glLineWidth](_glLineWidth)
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| [_GL_MULTISAMPLE](_GL_MULTISAMPLE)
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| [_glSampleCoverage](_glSampleCoverage)
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| [_GL_POLYGON_SMOOTH](_GL_POLYGON_SMOOTH)
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| [_glPolygonMode](_glPolygonMode)
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| [_GL_POLYGON_OFFSET_FILL](_GL_POLYGON_OFFSET_FILL)
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| [_glPolygonOffset](_glPolygonOffset)
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| [_GL_POLYGON_OFFSET_LINE](_GL_POLYGON_OFFSET_LINE)
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| [_glPolygonOffset](_glPolygonOffset)
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| [_GL_POLYGON_OFFSET_POINT](_GL_POLYGON_OFFSET_POINT)
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| [_glPolygonOffset](_glPolygonOffset)
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| [_GL_PROGRAM_POINT_SIZE](_GL_PROGRAM_POINT_SIZE)
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| [_glEnable](_glEnable)
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| [_GL_PRIMITIVE_RESTART](_GL_PRIMITIVE_RESTART)
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| [_glEnable](_glEnable), [_glPrimitiveRestartIndex](_glPrimitiveRestartIndex)
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| [_GL_SAMPLE_ALPHA_TO_COVERAGE](_GL_SAMPLE_ALPHA_TO_COVERAGE)
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| [_glSampleCoverage](_glSampleCoverage)
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| [_GL_SAMPLE_ALPHA_TO_ONE](_GL_SAMPLE_ALPHA_TO_ONE)
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| [_glSampleCoverage](_glSampleCoverage)
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| [_GL_SAMPLE_COVERAGE](_GL_SAMPLE_COVERAGE)
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| [_glSampleCoverage](_glSampleCoverage)
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| [_GL_SAMPLE_MASK](_GL_SAMPLE_MASK)
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| [_glEnable](_glEnable)
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| [_GL_SCISSOR_TEST](_GL_SCISSOR_TEST)
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| [_glScissor](_glScissor)
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| [_GL_STENCIL_TEST](_GL_STENCIL_TEST)
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| [_glStencilFunc](_glStencilFunc), [_glStencilOp](_glStencilOp)
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| [_GL_TEXTURE_CUBEMAP_SEAMLESS](_GL_TEXTURE_CUBEMAP_SEAMLESS)
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| [_glEnable](_glEnable)
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|}
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## Notes
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If an error is generated, **_glIsEnabled** and **_glIsEnabledi** return [_GL_FALSE](_GL_FALSE).
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[_GL_DEBUG_OUTPUT](_GL_DEBUG_OUTPUT) and [_GL_DEBUG_OUTPUT_SYNCHRONOUS](_GL_DEBUG_OUTPUT_SYNCHRONOUS) are available only if the GL version is 4.3 or greater.
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## Error(s)
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[_GL_INVALID_ENUM](_GL_INVALID_ENUM) is generated if cap is not an accepted value.
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[_GL_INVALID_VALUE](_GL_INVALID_VALUE) is generated by **_glIsEnabledi** if index is outside the valid range for the indexed state cap.
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## See Also
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[_GL](_GL)
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[_glEnable](_glEnable), [_glDisable](_glDisable), [_glGet](_glGet)
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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/ http://oss.sgi.com/projects/FreeB/].
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