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-This is a nearly verbatim copy of the GLU tessellator source code from
-SGI's OpenGL Sample Implementation at
-http://oss.sgi.com/projects/ogl-sample/ . Per
-http://oss.sgi.com/projects/FreeB/ , the code is covered under the SGI
-Free Software License B, version 2.0, a copy of which is in
-LICENSE.txt in this directory.
-
-The following changes were made in order to incorporate this code:
-
- - The addition of a simplified gluos.h to eliminate operating system
- dependencies.
-
- - The removal of inclusion of GL/glu.h and replacement with an
- include of internal_glu.h.
-
- - Includes were modified to be scoped within thirdparty/glu/ and
- thirdparty/glu/libtess/.
-
- - The entry points to the tessellator were prefixed with internal_
- to avoid symbol collisions with any host OS version of GLU.
-
- - In tess.c, the obsolete entry points gluBeginPolygon,
- gluNextContour and gluEndPolygon in tess.c were #if 0'd out.
- Default branches were added to the switch statements in GotoState.
-
- - In memalloc.h, the include of malloc.h was changed to an include
- of stdlib.h.
-
- - In normal.c, an unused variable "w" was removed from
- __gl_projectPolygon. #if guards were placed around the definition
- of the unused Normalize function.
-
- - In priorityq-heap.c, an #include of <limits.h> was added.
-
- - In sweep.c, IsWindingInside() was given a return value to silence a
- warning-as-error in release builds.
-
- - In sweep.c, DoneEdgeDict()'s fixedEdges was wrapped in #indef NDEBUG, to
- silence a warning-as-error in release builds.
-
- - In priorityq.c, render.c, and others: the construct "if(1)...else" was
- replaced with "do{...}while(1)" to silence a warning-as-error in Mac builds.