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_DISTANCEi | 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.
| OpenGL Version | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Function / Feature Name | 2.0 | 2.1 | 3.0 | 3.1 | 3.2 | 3.3 | 4.0 | 4.1 | 4.2 | 4.3 | 4.4 | 4.5 |
glIsEnabled | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
glIsEnabledi | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
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