gl_FragDepth.3G man page

gl_FragDepth — establishes a depth value for the current fragment


out float gl_FragDepth ;.SH "DESCRIPTION"

Available only in the fragment language, gl_FragDepth is an output variable that is used to establish the depth value for the current fragment. If depth buffering is enabled and no shader writes to gl_FragDepth, then the fixed function value for depth will be used (this value is contained in the z component of gl_FragCoord()) otherwise, the value written to gl_FragDepth is used. If a shader statically assigns to gl_FragDepth, then the value of the fragment's depth may be undefined for executions of the shader that take that path. That is, if the set of linked fragment shaders statically contain a write to gl_FragDepth, then it is responsible for always writing it.

Version Support

OpenGL Shading Language Version
Variable Name1.101.201.301.401.503.304.

See Also



12/28/2016 [FIXME: source] [FIXME: manual]