glEnable — enable or disable server-side GL capabilities
void glEnable( | GLenum cap); |
void glDisable( | GLenum cap); |
cap Specifies a symbolic constant indicating a GL capability.
glEnable and glDisable enable and disable various capabilities. Use glIsEnabled or glGet to determine the current setting of any capability. The initial value for each capability with the exception of GL_DITHER is GL_FALSE. The initial value for GL_DITHER is GL_TRUE.
Both glEnable and glDisable take a single argument, cap, which can assume one of the following values:
GL_BLEND If enabled, blend the computed fragment color values with the values in the color buffers. See glBlendFunc.
GL_CULL_FACE
If enabled, cull polygons based on their winding in window coordinates. See glCullFace.
GL_DEPTH_TEST If enabled, do depth comparisons and update the depth buffer. Note that even if the depth buffer exists and the depth mask is non-zero, the depth buffer is not updated if the depth test is disabled. See glDepthFunc and glDepthRangef.
GL_DITHER If enabled, dither color components or indices before they are written to the color buffer.
GL_POLYGON_OFFSET_FILL If enabled, an offset is added to depth values of a polygon's fragments before the depth comparison is performed. See glPolygonOffset.
GL_PRIMITIVE_RESTART_FIXED_INDEX Enables primitive restarting. If enabled, any one of the draw commands which transfers a set of generic attribute array elements to the GL will restart the primitive when the index of the vertex is equal to where n is 8, 16 or 32 if the type is GL_UNSIGNED_BYTE, GL_UNSIGNED_SHORT, or GL_UNSIGNED_INT, respectively.
GL_RASTERIZER_DISCARD If enabled, primitives are discarded immediately before the rasterization stage, but after the optional transform feedback stage. glClear and glClearBuffer* commands are also ignored.
GL_SAMPLE_ALPHA_TO_COVERAGE If enabled, compute a temporary coverage value where each bit is determined by the alpha value at the corresponding sample location. The temporary coverage value is then ANDed with the fragment coverage value.
GL_SAMPLE_COVERAGE If enabled, the fragment's coverage is ANDed with the temporary coverage value. If GL_SAMPLE_COVERAGE_INVERT is set to GL_TRUE, invert the coverage value. See glSampleCoverage.
GL_SAMPLE_MASK If enabled, the fragment's coverage is ANDed with the coverage value GL_SAMPLE_MASK_VALUE. See glSampleMaski.
GL_SCISSOR_TEST If enabled, discard fragments that are outside the scissor rectangle. See glScissor.
GL_STENCIL_TEST If enabled, do stencil testing and update the stencil buffer. See glStencilFunc and glStencilOp.
GL_INVALID_ENUM is generated if cap is not one of the values listed previously.
| OpenGL ES API Version | |||
|---|---|---|---|
| Function Name | 2.0 | 3.0 | 3.1 |
glEnable | ✔ | ✔ | ✔ |
glDisable | ✔ | ✔ | ✔ |
glBlendFunc, glCullFace, glDepthFunc, glDepthRangef, glGet, glIsEnabled, glPolygonOffset, glSampleCoverage, glScissor, glStencilFunc, glStencilOp,
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://web.archive.org/web/20171022161616/http://oss.sgi.com/projects/FreeB/.