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Diffstat (limited to 'nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/shademodel.gl')
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diff --git a/nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/shademodel.gl b/nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/shademodel.gl new file mode 100644 index 000000000..8255bc3c7 --- /dev/null +++ b/nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/shademodel.gl @@ -0,0 +1,104 @@ +_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(ShadeModel,select flat or smooth shading) +_names(ShadeModel) +.EQ +delim $$ +.EN +.SH PARAMETERS +_phead(_param1) +Specifies a symbolic value representing a shading technique. +Accepted values are _const(FLAT) and _const(SMOOTH). +The initial value is _const(SMOOTH). +.SH DESCRIPTION +GL primitives can have either flat or smooth shading. +Smooth shading, +the default, +causes the computed colors of vertices to be interpolated as the +primitive is rasterized, +typically assigning different colors to each resulting pixel fragment. +Flat shading selects the computed color of just one vertex +and assigns it to all the pixel fragments +generated by rasterizing a single primitive. +In either case, the computed color of a vertex is the result of +lighting if lighting is enabled, +or it is the current color at the time the vertex was specified if +lighting is disabled. +.P +Flat and smooth shading are indistinguishable for points. +Starting when _cmnd(Begin) is issued and counting vertices and +primitives from 1, the GL gives each flat-shaded line segment $i$ the +computed color of vertex $i ~+~ 1$, its second vertex. +Counting similarly from 1, +the GL gives each flat-shaded polygon the computed color of the vertex listed +in the following table. +This is the last vertex to specify the polygon in all cases except single +polygons, +where the first vertex specifies the flat-shaded color. +.sp +.TS +center; +lb cb +l c . +_ +Primitive Type of Polygon $i$ Vertex +_ +Single polygon ($ i ~==~ 1 $) 1 +Triangle strip $i ~+~ 2$ +Triangle fan $i ~+~ 2$ +Independent triangle $ 3 i$ +Quad strip $2 i ~+~ 2$ +Independent quad $ 4 i $ +_ +.TE +.sp +Flat and smooth shading are specified by _cmnd with _param1 set to +_const(FLAT) and _const(SMOOTH), respectively. +.SH ERRORS +_const(INVALID_ENUM) is generated if _param1 is any value other than +_const(FLAT) or _const(SMOOTH). +.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(SHADE_MODEL) +.SH SEE ALSO +_cmnd(Begin), +_cmnd(Color), +_cmnd(Light), +_cmnd(LightModel) |