glIsEnabled

glIsEnabled: man4/glIsEnabled.xml

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 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.