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Diffstat (limited to 'nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/depthfunc.gl')
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diff --git a/nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/depthfunc.gl b/nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/depthfunc.gl new file mode 100644 index 000000000..a41227688 --- /dev/null +++ b/nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/depthfunc.gl @@ -0,0 +1,105 @@ +_C_ License Applicability. Except to the extent portions of this file are +_C_ made subject to an alternative license as permitted in the SGI Free +_C_ Software License B, Version 1.1 (the "License"), the contents of this +_C_ file are subject only to the provisions of the License. You may not use +_C_ this file except in compliance with the License. You may obtain a copy +_C_ of the License at Silicon Graphics, Inc., attn: Legal Services, 1600 +_C_ Amphitheatre Parkway, Mountain View, CA 94043-1351, or at: +_C_ +_C_ http://oss.sgi.com/projects/FreeB +_C_ +_C_ Note that, as provided in the License, the Software is distributed on an +_C_ "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS +_C_ DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND +_C_ CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A +_C_ PARTICULAR PURPOSE, AND NON-INFRINGEMENT. +_C_ +_C_ Original Code. The Original Code is: OpenGL Sample Implementation, +_C_ Version 1.2.1, released January 26, 2000, developed by Silicon Graphics, +_C_ Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc. +_C_ Copyright in any portions created by third parties is as indicated +_C_ elsewhere herein. All Rights Reserved. +_C_ +_C_ Additional Notice Provisions: The application programming interfaces +_C_ established by SGI in conjunction with the Original Code are The +_C_ OpenGL(R) Graphics System: A Specification (Version 1.2.1), released +_C_ April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version +_C_ 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X +_C_ Window System(R) (Version 1.3), released October 19, 1998. This software +_C_ was created using the OpenGL(R) version 1.2.1 Sample Implementation +_C_ published by SGI, but has not been independently verified as being +_C_ compliant with the OpenGL(R) version 1.2.1 Specification. +_C_ +_C_ The first character in this file must be an '_'! +_C_ Anything on a line after _C_ is ignored +_define(_filters,tbl|eqn)_C_ +_C_ eqn is automatically replaced with neqn for nroff +_header(DepthFunc,specify the value used for depth buffer comparisons) +_names(DepthFunc) +.SH PARAMETERS +_phead(_param1) +Specifies the depth comparison function. +Symbolic constants +_const(NEVER), +_const(LESS), +_const(EQUAL), +_const(LEQUAL), +_const(GREATER), +_const(NOTEQUAL), +_const(GEQUAL), and +_const(ALWAYS) are accepted. +The initial value is _const(LESS). +.SH DESCRIPTION +_cmnd specifies the function used to compare each incoming pixel depth value +with the depth value present in the depth buffer. +The comparison is performed only if depth testing is enabled. +(See _cmnd(Enable) and _cmnd(Disable) of _const(DEPTH_TEST).) +.P +_param1 specifies the conditions under which the pixel will be drawn. +The comparison functions are as follows: +.TP 16 +_const(NEVER) +Never passes. +.TP +_const(LESS) +Passes if the incoming depth value is less than the stored depth value. +.TP +_const(EQUAL) +Passes if the incoming depth value is equal to the stored depth value. +.TP +_const(LEQUAL) +Passes if the incoming depth value is less than or equal to +the stored depth value. +.TP +_const(GREATER) +Passes if the incoming depth value is greater than the stored depth value. +.TP +_const(NOTEQUAL) +Passes if the incoming depth value is not equal to the stored depth value. +.TP +_const(GEQUAL) +Passes if the incoming depth value is greater than or equal to +the stored depth value. +.TP +_const(ALWAYS) +Always passes. +.P +The initial value of _param1 is _const(LESS). +Initially, depth testing is disabled. +.NOTES +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. +.SH ERRORS +_const(INVALID_ENUM) is generated if _param1 is not an accepted value. +.P +_const(INVALID_OPERATION) is generated if _cmnd +is executed between the execution of _cmnd(Begin) +and the corresponding execution of _cmnd(End). +.SH ASSOCIATED GETS +_cmnd(Get) with argument _const(DEPTH_FUNC) +.br +_cmnd(IsEnabled) with argument _const(DEPTH_TEST) +.SH SEE ALSO +_cmnd(DepthRange), +_cmnd(Enable), +_cmnd(PolygonOffset) |