1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/COPYING	Tue Oct 25 08:59:07 2011 +0300
     1.3 @@ -0,0 +1,674 @@
     1.4 +                    GNU GENERAL PUBLIC LICENSE
     1.5 +                       Version 3, 29 June 2007
     1.6 +
     1.7 + Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
     1.8 + Everyone is permitted to copy and distribute verbatim copies
     1.9 + of this license document, but changing it is not allowed.
    1.10 +
    1.11 +                            Preamble
    1.12 +
    1.13 +  The GNU General Public License is a free, copyleft license for
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    1.16 +  The licenses for most software and other practical works are designed
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    1.20 +software for all its users.  We, the Free Software Foundation, use the
    1.21 +GNU General Public License for most of our software; it applies also to
    1.22 +any other work released this way by its authors.  You can apply it to
    1.23 +your programs, too.
    1.24 +
    1.25 +  When we speak of free software, we are referring to freedom, not
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    1.37 +  For example, if you distribute copies of such a program, whether
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    1.43 +  Developers that use the GNU GPL protect your rights with two steps:
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    1.53 +  Some devices are designed to deny users access to install or run
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    1.73 +
    1.74 +                       TERMS AND CONDITIONS
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    1.76 +  0. Definitions.
    1.77 +
    1.78 +  "This License" refers to version 3 of the GNU General Public License.
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    1.80 +  "Copyright" also means copyright-like laws that apply to other kinds of
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    1.83 +  "The Program" refers to any copyrightable work licensed under this
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    1.87 +  To "modify" a work means to copy from or adapt all or part of the work
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   1.233 +    d) If the work has interactive user interfaces, each must display
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   1.238 +  A compilation of a covered work with other separate and independent
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   1.244 +beyond what the individual works permit.  Inclusion of a covered work
   1.245 +in an aggregate does not cause this License to apply to the other
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   1.247 +
   1.248 +  6. Conveying Non-Source Forms.
   1.249 +
   1.250 +  You may convey a covered work in object code form under the terms
   1.251 +of sections 4 and 5, provided that you also convey the
   1.252 +machine-readable Corresponding Source under the terms of this License,
   1.253 +in one of these ways:
   1.254 +
   1.255 +    a) Convey the object code in, or embodied in, a physical product
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   1.260 +    b) Convey the object code in, or embodied in, a physical product
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   1.272 +    c) Convey individual copies of the object code with a copy of the
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   1.278 +    d) Convey the object code by offering access from a designated
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   1.291 +    e) Convey the object code using peer-to-peer transmission, provided
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   1.296 +  A separable portion of the object code, whose source code is excluded
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   1.300 +  A "User Product" is either (1) a "consumer product", which means any
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   1.313 +  "Installation Information" for a User Product means any methods,
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   1.321 +  If you convey an object code work under this section in, or with, or
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   1.332 +  The requirement to provide Installation Information does not include a
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   1.340 +  Corresponding Source conveyed, and Installation Information provided,
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   1.345 +
   1.346 +  7. Additional Terms.
   1.347 +
   1.348 +  "Additional permissions" are terms that supplement the terms of this
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   1.350 +Additional permissions that are applicable to the entire Program shall
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   1.353 +apply only to part of the Program, that part may be used separately
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   1.357 +  When you convey a copy of a covered work, you may at your option
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   1.364 +  Notwithstanding any other provision of this License, for material you
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   1.368 +    a) Disclaiming warranty or limiting liability differently from the
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   1.406 +  Additional terms, permissive or non-permissive, may be stated in the
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   1.410 +  8. Termination.
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   1.412 +  You may not propagate or modify a covered work except as expressly
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   1.425 +  Moreover, your license from a particular copyright holder is
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   1.432 +  Termination of your rights under this section does not terminate the
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   1.438 +  9. Acceptance Not Required for Having Copies.
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   1.440 +  You are not required to accept this License in order to receive or
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   1.456 +  An "entity transaction" is a transaction transferring control of an
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   1.471 +any patent claim is infringed by making, using, selling, offering for
   1.472 +sale, or importing the Program or any portion of it.
   1.473 +
   1.474 +  11. Patents.
   1.475 +
   1.476 +  A "contributor" is a copyright holder who authorizes use under this
   1.477 +License of the Program or a work on which the Program is based.  The
   1.478 +work thus licensed is called the contributor's "contributor version".
   1.479 +
   1.480 +  A contributor's "essential patent claims" are all patent claims
   1.481 +owned or controlled by the contributor, whether already acquired or
   1.482 +hereafter acquired, that would be infringed by some manner, permitted
   1.483 +by this License, of making, using, or selling its contributor version,
   1.484 +but do not include claims that would be infringed only as a
   1.485 +consequence of further modification of the contributor version.  For
   1.486 +purposes of this definition, "control" includes the right to grant
   1.487 +patent sublicenses in a manner consistent with the requirements of
   1.488 +this License.
   1.489 +
   1.490 +  Each contributor grants you a non-exclusive, worldwide, royalty-free
   1.491 +patent license under the contributor's essential patent claims, to
   1.492 +make, use, sell, offer for sale, import and otherwise run, modify and
   1.493 +propagate the contents of its contributor version.
   1.494 +
   1.495 +  In the following three paragraphs, a "patent license" is any express
   1.496 +agreement or commitment, however denominated, not to enforce a patent
   1.497 +(such as an express permission to practice a patent or covenant not to
   1.498 +sue for patent infringement).  To "grant" such a patent license to a
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   1.500 +patent against the party.
   1.501 +
   1.502 +  If you convey a covered work, knowingly relying on a patent license,
   1.503 +and the Corresponding Source of the work is not available for anyone
   1.504 +to copy, free of charge and under the terms of this License, through a
   1.505 +publicly available network server or other readily accessible means,
   1.506 +then you must either (1) cause the Corresponding Source to be so
   1.507 +available, or (2) arrange to deprive yourself of the benefit of the
   1.508 +patent license for this particular work, or (3) arrange, in a manner
   1.509 +consistent with the requirements of this License, to extend the patent
   1.510 +license to downstream recipients.  "Knowingly relying" means you have
   1.511 +actual knowledge that, but for the patent license, your conveying the
   1.512 +covered work in a country, or your recipient's use of the covered work
   1.513 +in a country, would infringe one or more identifiable patents in that
   1.514 +country that you have reason to believe are valid.
   1.515 +
   1.516 +  If, pursuant to or in connection with a single transaction or
   1.517 +arrangement, you convey, or propagate by procuring conveyance of, a
   1.518 +covered work, and grant a patent license to some of the parties
   1.519 +receiving the covered work authorizing them to use, propagate, modify
   1.520 +or convey a specific copy of the covered work, then the patent license
   1.521 +you grant is automatically extended to all recipients of the covered
   1.522 +work and works based on it.
   1.523 +
   1.524 +  A patent license is "discriminatory" if it does not include within
   1.525 +the scope of its coverage, prohibits the exercise of, or is
   1.526 +conditioned on the non-exercise of one or more of the rights that are
   1.527 +specifically granted under this License.  You may not convey a covered
   1.528 +work if you are a party to an arrangement with a third party that is
   1.529 +in the business of distributing software, under which you make payment
   1.530 +to the third party based on the extent of your activity of conveying
   1.531 +the work, and under which the third party grants, to any of the
   1.532 +parties who would receive the covered work from you, a discriminatory
   1.533 +patent license (a) in connection with copies of the covered work
   1.534 +conveyed by you (or copies made from those copies), or (b) primarily
   1.535 +for and in connection with specific products or compilations that
   1.536 +contain the covered work, unless you entered into that arrangement,
   1.537 +or that patent license was granted, prior to 28 March 2007.
   1.538 +
   1.539 +  Nothing in this License shall be construed as excluding or limiting
   1.540 +any implied license or other defenses to infringement that may
   1.541 +otherwise be available to you under applicable patent law.
   1.542 +
   1.543 +  12. No Surrender of Others' Freedom.
   1.544 +
   1.545 +  If conditions are imposed on you (whether by court order, agreement or
   1.546 +otherwise) that contradict the conditions of this License, they do not
   1.547 +excuse you from the conditions of this License.  If you cannot convey a
   1.548 +covered work so as to satisfy simultaneously your obligations under this
   1.549 +License and any other pertinent obligations, then as a consequence you may
   1.550 +not convey it at all.  For example, if you agree to terms that obligate you
   1.551 +to collect a royalty for further conveying from those to whom you convey
   1.552 +the Program, the only way you could satisfy both those terms and this
   1.553 +License would be to refrain entirely from conveying the Program.
   1.554 +
   1.555 +  13. Use with the GNU Affero General Public License.
   1.556 +
   1.557 +  Notwithstanding any other provision of this License, you have
   1.558 +permission to link or combine any covered work with a work licensed
   1.559 +under version 3 of the GNU Affero General Public License into a single
   1.560 +combined work, and to convey the resulting work.  The terms of this
   1.561 +License will continue to apply to the part which is the covered work,
   1.562 +but the special requirements of the GNU Affero General Public License,
   1.563 +section 13, concerning interaction through a network will apply to the
   1.564 +combination as such.
   1.565 +
   1.566 +  14. Revised Versions of this License.
   1.567 +
   1.568 +  The Free Software Foundation may publish revised and/or new versions of
   1.569 +the GNU General Public License from time to time.  Such new versions will
   1.570 +be similar in spirit to the present version, but may differ in detail to
   1.571 +address new problems or concerns.
   1.572 +
   1.573 +  Each version is given a distinguishing version number.  If the
   1.574 +Program specifies that a certain numbered version of the GNU General
   1.575 +Public License "or any later version" applies to it, you have the
   1.576 +option of following the terms and conditions either of that numbered
   1.577 +version or of any later version published by the Free Software
   1.578 +Foundation.  If the Program does not specify a version number of the
   1.579 +GNU General Public License, you may choose any version ever published
   1.580 +by the Free Software Foundation.
   1.581 +
   1.582 +  If the Program specifies that a proxy can decide which future
   1.583 +versions of the GNU General Public License can be used, that proxy's
   1.584 +public statement of acceptance of a version permanently authorizes you
   1.585 +to choose that version for the Program.
   1.586 +
   1.587 +  Later license versions may give you additional or different
   1.588 +permissions.  However, no additional obligations are imposed on any
   1.589 +author or copyright holder as a result of your choosing to follow a
   1.590 +later version.
   1.591 +
   1.592 +  15. Disclaimer of Warranty.
   1.593 +
   1.594 +  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
   1.595 +APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
   1.596 +HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
   1.597 +OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
   1.598 +THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   1.599 +PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
   1.600 +IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
   1.601 +ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
   1.602 +
   1.603 +  16. Limitation of Liability.
   1.604 +
   1.605 +  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
   1.606 +WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
   1.607 +THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
   1.608 +GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
   1.609 +USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
   1.610 +DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
   1.611 +PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
   1.612 +EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
   1.613 +SUCH DAMAGES.
   1.614 +
   1.615 +  17. Interpretation of Sections 15 and 16.
   1.616 +
   1.617 +  If the disclaimer of warranty and limitation of liability provided
   1.618 +above cannot be given local legal effect according to their terms,
   1.619 +reviewing courts shall apply local law that most closely approximates
   1.620 +an absolute waiver of all civil liability in connection with the
   1.621 +Program, unless a warranty or assumption of liability accompanies a
   1.622 +copy of the Program in return for a fee.
   1.623 +
   1.624 +                     END OF TERMS AND CONDITIONS
   1.625 +
   1.626 +            How to Apply These Terms to Your New Programs
   1.627 +
   1.628 +  If you develop a new program, and you want it to be of the greatest
   1.629 +possible use to the public, the best way to achieve this is to make it
   1.630 +free software which everyone can redistribute and change under these terms.
   1.631 +
   1.632 +  To do so, attach the following notices to the program.  It is safest
   1.633 +to attach them to the start of each source file to most effectively
   1.634 +state the exclusion of warranty; and each file should have at least
   1.635 +the "copyright" line and a pointer to where the full notice is found.
   1.636 +
   1.637 +    <one line to give the program's name and a brief idea of what it does.>
   1.638 +    Copyright (C) <year>  <name of author>
   1.639 +
   1.640 +    This program is free software: you can redistribute it and/or modify
   1.641 +    it under the terms of the GNU General Public License as published by
   1.642 +    the Free Software Foundation, either version 3 of the License, or
   1.643 +    (at your option) any later version.
   1.644 +
   1.645 +    This program is distributed in the hope that it will be useful,
   1.646 +    but WITHOUT ANY WARRANTY; without even the implied warranty of
   1.647 +    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   1.648 +    GNU General Public License for more details.
   1.649 +
   1.650 +    You should have received a copy of the GNU General Public License
   1.651 +    along with this program.  If not, see <http://www.gnu.org/licenses/>.
   1.652 +
   1.653 +Also add information on how to contact you by electronic and paper mail.
   1.654 +
   1.655 +  If the program does terminal interaction, make it output a short
   1.656 +notice like this when it starts in an interactive mode:
   1.657 +
   1.658 +    <program>  Copyright (C) <year>  <name of author>
   1.659 +    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
   1.660 +    This is free software, and you are welcome to redistribute it
   1.661 +    under certain conditions; type `show c' for details.
   1.662 +
   1.663 +The hypothetical commands `show w' and `show c' should show the appropriate
   1.664 +parts of the General Public License.  Of course, your program's commands
   1.665 +might be different; for a GUI interface, you would use an "about box".
   1.666 +
   1.667 +  You should also get your employer (if you work as a programmer) or school,
   1.668 +if any, to sign a "copyright disclaimer" for the program, if necessary.
   1.669 +For more information on this, and how to apply and follow the GNU GPL, see
   1.670 +<http://www.gnu.org/licenses/>.
   1.671 +
   1.672 +  The GNU General Public License does not permit incorporating your program
   1.673 +into proprietary programs.  If your program is a subroutine library, you
   1.674 +may consider it more useful to permit linking proprietary applications with
   1.675 +the library.  If this is what you want to do, use the GNU Lesser General
   1.676 +Public License instead of this License.  But first, please read
   1.677 +<http://www.gnu.org/philosophy/why-not-lgpl.html>.

     2.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     2.2 +++ b/COPYING.LESSER	Tue Oct 25 08:59:07 2011 +0300
     2.3 @@ -0,0 +1,165 @@
     2.4 +                   GNU LESSER GENERAL PUBLIC LICENSE
     2.5 +                       Version 3, 29 June 2007
     2.6 +
     2.7 + Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
     2.8 + Everyone is permitted to copy and distribute verbatim copies
     2.9 + of this license document, but changing it is not allowed.
    2.10 +
    2.11 +
    2.12 +  This version of the GNU Lesser General Public License incorporates
    2.13 +the terms and conditions of version 3 of the GNU General Public
    2.14 +License, supplemented by the additional permissions listed below.
    2.15 +
    2.16 +  0. Additional Definitions.
    2.17 +
    2.18 +  As used herein, "this License" refers to version 3 of the GNU Lesser
    2.19 +General Public License, and the "GNU GPL" refers to version 3 of the GNU
    2.20 +General Public License.
    2.21 +
    2.22 +  "The Library" refers to a covered work governed by this License,
    2.23 +other than an Application or a Combined Work as defined below.
    2.24 +
    2.25 +  An "Application" is any work that makes use of an interface provided
    2.26 +by the Library, but which is not otherwise based on the Library.
    2.27 +Defining a subclass of a class defined by the Library is deemed a mode
    2.28 +of using an interface provided by the Library.
    2.29 +
    2.30 +  A "Combined Work" is a work produced by combining or linking an
    2.31 +Application with the Library.  The particular version of the Library
    2.32 +with which the Combined Work was made is also called the "Linked
    2.33 +Version".
    2.34 +
    2.35 +  The "Minimal Corresponding Source" for a Combined Work means the
    2.36 +Corresponding Source for the Combined Work, excluding any source code
    2.37 +for portions of the Combined Work that, considered in isolation, are
    2.38 +based on the Application, and not on the Linked Version.
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    2.40 +  The "Corresponding Application Code" for a Combined Work means the
    2.41 +object code and/or source code for the Application, including any data
    2.42 +and utility programs needed for reproducing the Combined Work from the
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    2.44 +
    2.45 +  1. Exception to Section 3 of the GNU GPL.
    2.46 +
    2.47 +  You may convey a covered work under sections 3 and 4 of this License
    2.48 +without being bound by section 3 of the GNU GPL.
    2.49 +
    2.50 +  2. Conveying Modified Versions.
    2.51 +
    2.52 +  If you modify a copy of the Library, and, in your modifications, a
    2.53 +facility refers to a function or data to be supplied by an Application
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    2.55 +facility is invoked), then you may convey a copy of the modified
    2.56 +version:
    2.57 +
    2.58 +   a) under this License, provided that you make a good faith effort to
    2.59 +   ensure that, in the event an Application does not supply the
    2.60 +   function or data, the facility still operates, and performs
    2.61 +   whatever part of its purpose remains meaningful, or
    2.62 +
    2.63 +   b) under the GNU GPL, with none of the additional permissions of
    2.64 +   this License applicable to that copy.
    2.65 +
    2.66 +  3. Object Code Incorporating Material from Library Header Files.
    2.67 +
    2.68 +  The object code form of an Application may incorporate material from
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    2.72 +layouts and accessors, or small macros, inline functions and templates
    2.73 +(ten or fewer lines in length), you do both of the following:
    2.74 +
    2.75 +   a) Give prominent notice with each copy of the object code that the
    2.76 +   Library is used in it and that the Library and its use are
    2.77 +   covered by this License.
    2.78 +
    2.79 +   b) Accompany the object code with a copy of the GNU GPL and this license
    2.80 +   document.
    2.81 +
    2.82 +  4. Combined Works.
    2.83 +
    2.84 +  You may convey a Combined Work under terms of your choice that,
    2.85 +taken together, effectively do not restrict modification of the
    2.86 +portions of the Library contained in the Combined Work and reverse
    2.87 +engineering for debugging such modifications, if you also do each of
    2.88 +the following:
    2.89 +
    2.90 +   a) Give prominent notice with each copy of the Combined Work that
    2.91 +   the Library is used in it and that the Library and its use are
    2.92 +   covered by this License.
    2.93 +
    2.94 +   b) Accompany the Combined Work with a copy of the GNU GPL and this license
    2.95 +   document.
    2.96 +
    2.97 +   c) For a Combined Work that displays copyright notices during
    2.98 +   execution, include the copyright notice for the Library among
    2.99 +   these notices, as well as a reference directing the user to the
   2.100 +   copies of the GNU GPL and this license document.
   2.101 +
   2.102 +   d) Do one of the following:
   2.103 +
   2.104 +       0) Convey the Minimal Corresponding Source under the terms of this
   2.105 +       License, and the Corresponding Application Code in a form
   2.106 +       suitable for, and under terms that permit, the user to
   2.107 +       recombine or relink the Application with a modified version of
   2.108 +       the Linked Version to produce a modified Combined Work, in the
   2.109 +       manner specified by section 6 of the GNU GPL for conveying
   2.110 +       Corresponding Source.
   2.111 +
   2.112 +       1) Use a suitable shared library mechanism for linking with the
   2.113 +       Library.  A suitable mechanism is one that (a) uses at run time
   2.114 +       a copy of the Library already present on the user's computer
   2.115 +       system, and (b) will operate properly with a modified version
   2.116 +       of the Library that is interface-compatible with the Linked
   2.117 +       Version.
   2.118 +
   2.119 +   e) Provide Installation Information, but only if you would otherwise
   2.120 +   be required to provide such information under section 6 of the
   2.121 +   GNU GPL, and only to the extent that such information is
   2.122 +   necessary to install and execute a modified version of the
   2.123 +   Combined Work produced by recombining or relinking the
   2.124 +   Application with a modified version of the Linked Version. (If
   2.125 +   you use option 4d0, the Installation Information must accompany
   2.126 +   the Minimal Corresponding Source and Corresponding Application
   2.127 +   Code. If you use option 4d1, you must provide the Installation
   2.128 +   Information in the manner specified by section 6 of the GNU GPL
   2.129 +   for conveying Corresponding Source.)
   2.130 +
   2.131 +  5. Combined Libraries.
   2.132 +
   2.133 +  You may place library facilities that are a work based on the
   2.134 +Library side by side in a single library together with other library
   2.135 +facilities that are not Applications and are not covered by this
   2.136 +License, and convey such a combined library under terms of your
   2.137 +choice, if you do both of the following:
   2.138 +
   2.139 +   a) Accompany the combined library with a copy of the same work based
   2.140 +   on the Library, uncombined with any other library facilities,
   2.141 +   conveyed under the terms of this License.
   2.142 +
   2.143 +   b) Give prominent notice with the combined library that part of it
   2.144 +   is a work based on the Library, and explaining where to find the
   2.145 +   accompanying uncombined form of the same work.
   2.146 +
   2.147 +  6. Revised Versions of the GNU Lesser General Public License.
   2.148 +
   2.149 +  The Free Software Foundation may publish revised and/or new versions
   2.150 +of the GNU Lesser General Public License from time to time. Such new
   2.151 +versions will be similar in spirit to the present version, but may
   2.152 +differ in detail to address new problems or concerns.
   2.153 +
   2.154 +  Each version is given a distinguishing version number. If the
   2.155 +Library as you received it specifies that a certain numbered version
   2.156 +of the GNU Lesser General Public License "or any later version"
   2.157 +applies to it, you have the option of following the terms and
   2.158 +conditions either of that published version or of any later version
   2.159 +published by the Free Software Foundation. If the Library as you
   2.160 +received it does not specify a version number of the GNU Lesser
   2.161 +General Public License, you may choose any version of the GNU Lesser
   2.162 +General Public License ever published by the Free Software Foundation.
   2.163 +
   2.164 +  If the Library as you received it specifies that a proxy can decide
   2.165 +whether future versions of the GNU Lesser General Public License shall
   2.166 +apply, that proxy's public statement of acceptance of any version is
   2.167 +permanent authorization for you to choose that version for the
   2.168 +Library.

     3.1 --- a/README	Tue Oct 25 07:57:07 2011 +0300
     3.2 +++ b/README	Tue Oct 25 08:59:07 2011 +0300
     3.3 @@ -10,7 +10,8 @@
     3.4  
     3.5  2. Usage
     3.6  --------
     3.7 -The following snippet is sufficient to draw the surface of an implict sphere.
     3.8 +The following snippet is sufficient to draw the surface of an implicit unit
     3.9 +sphere, centered around the origin.
    3.10  
    3.11       struct metasurface *ms;
    3.12       
    3.13 @@ -27,7 +28,7 @@
    3.14       /* evaluator */
    3.15       float eval(float x, float y, float z)
    3.16       {
    3.17 -         return x * x + y * y + z * z;
    3.18 +         return (x * x + y * y + z * z) - 1.0;
    3.19       }
    3.20  
    3.21  See the examples subdirectory for more examples.

     4.1 --- a/examples/metaballs/Makefile	Tue Oct 25 07:57:07 2011 +0300
     4.2 +++ b/examples/metaballs/Makefile	Tue Oct 25 08:59:07 2011 +0300
     4.3 @@ -3,8 +3,11 @@
     4.4  dep = $(obj:.o=.d)
     4.5  bin = metaballs
     4.6  
     4.7 +# uncomment the following line to disable shaders (for old systems like SGI or whatever)
     4.8 +#nosdr = -DNO_SHADERS
     4.9 +
    4.10  CC = gcc
    4.11 -CFLAGS = -pedantic -Wall -g -I../../src
    4.12 +CFLAGS = -pedantic -Wall -g -I../../src $(nosdr)
    4.13  LDFLAGS = -L../.. -lmetasurf $(libgl)
    4.14  
    4.15  ifeq ($(shell uname -s), Darwin)

     5.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     5.2 +++ b/examples/metaballs/README	Tue Oct 25 08:59:07 2011 +0300
     5.3 @@ -0,0 +1,10 @@
     5.4 +metasurf example: metaballs
     5.5 +
     5.6 +- move the active metaball with the spaceball or the mouse
     5.7 +- move the camera with the mouse by pressing any modifier (shift/ctrl/alt/whatever)
     5.8 +- spaceball buttons or spacebar on the keyboard changes the active metaball
     5.9 +- toggle fullscreen with the 'f' key
    5.10 +- pass -s on the command line for stereoscopic rendering (then toggle with the 's' key)
    5.11 +
    5.12 +If you're on an old system which doesn't support GLSL shaders, uncomment the
    5.13 +"nosdr = ..." line in the Makefile.

     6.1 --- a/examples/metaballs/src/metaballs.c	Tue Oct 25 07:57:07 2011 +0300
     6.2 +++ b/examples/metaballs/src/metaballs.c	Tue Oct 25 08:59:07 2011 +0300
     6.3 @@ -3,7 +3,11 @@
     6.4  #include <math.h>
     6.5  #include <assert.h>
     6.6  
     6.7 +#ifndef NO_SHADERS
     6.8  #include <GL/glew.h>
     6.9 +#include "sdr.h"
    6.10 +#endif
    6.11 +
    6.12  #ifndef __APPLE__
    6.13  #include <GL/glut.h>
    6.14  #else
    6.15 @@ -11,7 +15,6 @@
    6.16  #endif
    6.17  
    6.18  #include "cam.h"
    6.19 -#include "sdr.h"
    6.20  #include "metasurf.h"
    6.21  
    6.22  #define RES		38
    6.23 @@ -40,10 +43,14 @@
    6.24  void sball_motion(int x, int y, int z);
    6.25  int parse_args(int argc, char **argv);
    6.26  
    6.27 -int stereo;
    6.28 +int stereo, fullscreen;
    6.29 +int orig_xsz, orig_ysz;
    6.30 +
    6.31  struct metasurface *msurf;
    6.32  float threshold = 12;
    6.33 +#ifndef NO_SHADERS
    6.34  unsigned int sdr;
    6.35 +#endif
    6.36  int bidx = 1;
    6.37  
    6.38  int main(int argc, char **argv)
    6.39 @@ -60,6 +67,13 @@
    6.40  	glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE | (stereo ? GLUT_STEREO : 0));
    6.41  	glutCreateWindow("metasurf");
    6.42  
    6.43 +	orig_xsz = glutGet(GLUT_WINDOW_WIDTH);
    6.44 +	orig_ysz = glutGet(GLUT_WINDOW_HEIGHT);
    6.45 +
    6.46 +	if(fullscreen) {
    6.47 +		glutFullScreen();
    6.48 +	}
    6.49 +
    6.50  	glutDisplayFunc(disp);
    6.51  	glutReshapeFunc(reshape);
    6.52  	glutKeyboardFunc(keyb);
    6.53 @@ -68,7 +82,12 @@
    6.54  	glutSpaceballButtonFunc(sball_button);
    6.55  	glutSpaceballMotionFunc(sball_motion);
    6.56  
    6.57 +#ifndef NO_SHADERS
    6.58  	glewInit();
    6.59 +	if(!(sdr = create_program_load("sdr/vert.glsl", "sdr/frag.glsl"))) {
    6.60 +		return 1;
    6.61 +	}
    6.62 +#endif
    6.63  
    6.64  	glEnable(GL_CULL_FACE);
    6.65  	glEnable(GL_DEPTH_TEST);
    6.66 @@ -95,10 +114,6 @@
    6.67  
    6.68  	glClearColor(0.8, 0.8, 0.8, 1.0);
    6.69  
    6.70 -	if(!(sdr = create_program_load("sdr/vert.glsl", "sdr/frag.glsl"))) {
    6.71 -		return 1;
    6.72 -	}
    6.73 -
    6.74  	glutMainLoop();
    6.75  	return 0;
    6.76  }
    6.77 @@ -143,7 +158,9 @@
    6.78  	glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, ks);
    6.79  	glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 60.0);
    6.80  
    6.81 +#ifndef NO_SHADERS
    6.82  	bind_program(sdr);
    6.83 +#endif
    6.84  
    6.85  	glBegin(GL_TRIANGLES);
    6.86  	msurf_polygonize(msurf);
    6.87 @@ -201,6 +218,15 @@
    6.88  	case 27:
    6.89  		exit(0);
    6.90  
    6.91 +	case 'f':
    6.92 +		fullscreen = !fullscreen;
    6.93 +		if(fullscreen) {
    6.94 +			glutFullScreen();
    6.95 +		} else {
    6.96 +			glutReshapeWindow(orig_xsz, orig_ysz);
    6.97 +		}
    6.98 +		break;
    6.99 +
   6.100  	case 's':
   6.101  		stereo = !stereo;
   6.102  		glutPostRedisplay();
   6.103 @@ -254,14 +280,18 @@
   6.104  	prev_x = x;
   6.105  	prev_y = y;
   6.106  
   6.107 -	if(bnstate[GLUT_LEFT_BUTTON]) {
   6.108 -		cam_inp_rotate(dx, dy);
   6.109 -		glutPostRedisplay();
   6.110 +	if(glutGetModifiers()) {
   6.111 +		if(bnstate[GLUT_LEFT_BUTTON]) {
   6.112 +			cam_inp_rotate(dx, dy);
   6.113 +		}
   6.114 +		if(bnstate[GLUT_RIGHT_BUTTON]) {
   6.115 +			cam_inp_zoom(dy);
   6.116 +		}
   6.117 +	} else {
   6.118 +		mball[bidx].x += (float)dx * 0.005;
   6.119 +		mball[bidx].y -= (float)dy * 0.005;
   6.120  	}
   6.121 -	if(bnstate[GLUT_RIGHT_BUTTON]) {
   6.122 -		cam_inp_zoom(dy);
   6.123 -		glutPostRedisplay();
   6.124 -	}
   6.125 +	glutPostRedisplay();
   6.126  }
   6.127  
   6.128  void sball_button(int bn, int state)
   6.129 @@ -277,9 +307,9 @@
   6.130  
   6.131  void sball_motion(int x, int y, int z)
   6.132  {
   6.133 -	mball[bidx].x += (float)x / 32768.0;
   6.134 -	mball[bidx].y += (float)y / 32768.0;
   6.135 -	mball[bidx].z -= (float)z / 32768.0;
   6.136 +	mball[bidx].x += (float)x / 16384.0;
   6.137 +	mball[bidx].y += (float)y / 16384.0;
   6.138 +	mball[bidx].z -= (float)z / 16384.0;
   6.139  	glutPostRedisplay();
   6.140  }
   6.141  
   6.142 @@ -290,10 +320,22 @@
   6.143  	for(i=1; i<argc; i++) {
   6.144  		if(argv[i][0] == '-' && argv[i][2] == 0) {
   6.145  			switch(argv[i][1]) {
   6.146 +			case 'f':
   6.147 +				fullscreen = !fullscreen;
   6.148 +				break;
   6.149 +
   6.150  			case 's':
   6.151  				stereo = !stereo;
   6.152  				break;
   6.153  
   6.154 +			case 'h':
   6.155 +				printf("usage: %s [opt]\n", argv[0]);
   6.156 +				printf("options:\n");
   6.157 +				printf("  -f    start in fullscreen\n");
   6.158 +				printf("  -s    enable stereoscopic rendering\n");
   6.159 +				printf("  -h    print usage and exit\n");
   6.160 +				exit(0);
   6.161 +
   6.162  			default:
   6.163  				fprintf(stderr, "unrecognized option: %s\n", argv[i]);
   6.164  				return -1;

     7.1 --- a/examples/metaballs/src/sdr.c	Tue Oct 25 07:57:07 2011 +0300
     7.2 +++ b/examples/metaballs/src/sdr.c	Tue Oct 25 08:59:07 2011 +0300
     7.3 @@ -1,3 +1,5 @@
     7.4 +#ifndef NO_SHADERS
     7.5 +
     7.6  #include <stdio.h>
     7.7  #include <stdlib.h>
     7.8  #include <string.h>
     7.9 @@ -327,3 +329,5 @@
    7.10  {
    7.11  	glVertexAttrib3f(attr_loc, x, y, z);
    7.12  }
    7.13 +
    7.14 +#endif	/* !NO_SHADERS */

     8.1 --- a/src/metasurf.c	Tue Oct 25 07:57:07 2011 +0300
     8.2 +++ b/src/metasurf.c	Tue Oct 25 08:59:07 2011 +0300
     8.3 @@ -1,3 +1,21 @@
     8.4 +/*
     8.5 +metasurf - a library for implicit surface polygonization
     8.6 +Copyright (C) 2011  John Tsiombikas <nuclear@member.fsf.org>
     8.7 +
     8.8 +This program is free software: you can redistribute it and/or modify
     8.9 +it under the terms of the GNU Lesser General Public License as published by
    8.10 +the Free Software Foundation, either version 3 of the License, or
    8.11 +(at your option) any later version.
    8.12 +
    8.13 +This program is distributed in the hope that it will be useful,
    8.14 +but WITHOUT ANY WARRANTY; without even the implied warranty of
    8.15 +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    8.16 +GNU Lesser General Public License for more details.
    8.17 +
    8.18 +You should have received a copy of the GNU Lesser General Public License
    8.19 +along with this program.  If not, see <http://www.gnu.org/licenses/>.
    8.20 +*/
    8.21 +#include <stdio.h>
    8.22  #include <stdlib.h>
    8.23  #include "metasurf.h"
    8.24  #include "mcubes.h"
    8.25 @@ -60,7 +78,7 @@
    8.26  	ms->normal = 0;
    8.27  	ms->min[0] = ms->min[1] = ms->min[2] = -1.0;
    8.28  	ms->max[0] = ms->max[1] = ms->max[2] = 1.0;
    8.29 -	ms->res[0] = ms->res[1] = ms->res[2] = 32;
    8.30 +	ms->res[0] = ms->res[1] = ms->res[2] = 40;
    8.31  	ms->nverts = 0;
    8.32  
    8.33  	return 0;
    8.34 @@ -104,11 +122,16 @@
    8.35  }
    8.36  
    8.37  
    8.38 -void msurf_polygonize(struct metasurface *ms)
    8.39 +int msurf_polygonize(struct metasurface *ms)
    8.40  {
    8.41  	int i, j, k;
    8.42  	vec3 pos, delta;
    8.43  
    8.44 +	if(!ms->eval || !ms->vertex) {
    8.45 +		fprintf(stderr, "you need to set eval and vertex callbacks before calling msurf_polygonize\n");
    8.46 +		return -1;
    8.47 +	}
    8.48 +
    8.49  	for(i=0; i<3; i++) {
    8.50  		delta[i] = (ms->max[i] - ms->min[i]) / (float)ms->res[i];
    8.51  	}
    8.52 @@ -130,6 +153,7 @@
    8.53  		}
    8.54  		pos[0] += delta[0];
    8.55  	}
    8.56 +	return 0;
    8.57  }
    8.58  
    8.59  
    8.60 @@ -248,28 +272,22 @@
    8.61  	unsigned int code = mt_bitcode(val[idx[0]], val[idx[1]], val[idx[2]], val[idx[3]], ms->thres);
    8.62  
    8.63  	switch(code) {
    8.64 -	/*case 1:
    8.65 -	case INV(1):*/
    8.66 -	case 0x0e:
    8.67 -	case 0x01:
    8.68 +	case 1:
    8.69 +	case INV(1):
    8.70  		EDGE(0, 1);
    8.71  		EDGE(0, 2);
    8.72  		EDGE(0, 3);
    8.73  		break;
    8.74  
    8.75 -	/*case 2:
    8.76 -	case INV(2):*/
    8.77 -	case 0x0d:
    8.78 -	case 0x02:
    8.79 +	case 2:
    8.80 +	case INV(2):
    8.81  		EDGE(1, 0);
    8.82  		EDGE(1, 3);
    8.83  		EDGE(1, 2);
    8.84  		break;
    8.85  
    8.86 -	/*case 3:
    8.87 -	case INV(3):*/
    8.88 -	case 0x0c:
    8.89 -	case 0x03:
    8.90 +	case 3:
    8.91 +	case INV(3):
    8.92  		EDGE(0, 3);
    8.93  		EDGE(0, 2);
    8.94  		EDGE(1, 3);
    8.95 @@ -279,19 +297,15 @@
    8.96  		EDGE(0, 2);
    8.97  		break;
    8.98  
    8.99 -	/*case 4:
   8.100 -	case INV(4):*/
   8.101 -	case 0x0b:
   8.102 -	case 0x04:
   8.103 +	case 4:
   8.104 +	case INV(4):
   8.105  		EDGE(2, 0);
   8.106  		EDGE(2, 1);
   8.107  		EDGE(2, 3);
   8.108  		break;
   8.109  
   8.110 -	/*case 5:
   8.111 -	case INV(5):*/
   8.112 -	case 0x0a:
   8.113 -	case 0x05:
   8.114 +	case 5:
   8.115 +	case INV(5):
   8.116  		EDGE(0, 1);
   8.117  		EDGE(2, 3);
   8.118  		EDGE(0, 3);
   8.119 @@ -301,10 +315,8 @@
   8.120  		EDGE(2, 3);
   8.121  		break;
   8.122  
   8.123 -	/*case 6:
   8.124 -	case INV(6):*/
   8.125 -	case 0x09:
   8.126 -	case 0x06:
   8.127 +	case 6:
   8.128 +	case INV(6):
   8.129  		EDGE(0, 1);
   8.130  		EDGE(1, 3);
   8.131  		EDGE(2, 3);
   8.132 @@ -314,10 +326,8 @@
   8.133  		EDGE(2, 3);
   8.134  		break;
   8.135  
   8.136 -	/*case 7:
   8.137 -	case INV(7):*/
   8.138 -	case 0x07:
   8.139 -	case 0x08:
   8.140 +	case 7:
   8.141 +	case INV(7):
   8.142  		EDGE(3, 0);
   8.143  		EDGE(3, 2);
   8.144  		EDGE(3, 1);

     9.1 --- a/src/metasurf.h	Tue Oct 25 07:57:07 2011 +0300
     9.2 +++ b/src/metasurf.h	Tue Oct 25 08:59:07 2011 +0300
     9.3 @@ -1,3 +1,21 @@
     9.4 +/*
     9.5 +metasurf - a library for implicit surface polygonization
     9.6 +Copyright (C) 2011  John Tsiombikas <nuclear@member.fsf.org>
     9.7 +
     9.8 +This program is free software: you can redistribute it and/or modify
     9.9 +it under the terms of the GNU Lesser General Public License as published by
    9.10 +the Free Software Foundation, either version 3 of the License, or
    9.11 +(at your option) any later version.
    9.12 +
    9.13 +This program is distributed in the hope that it will be useful,
    9.14 +but WITHOUT ANY WARRANTY; without even the implied warranty of
    9.15 +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    9.16 +GNU Lesser General Public License for more details.
    9.17 +
    9.18 +You should have received a copy of the GNU Lesser General Public License
    9.19 +along with this program.  If not, see <http://www.gnu.org/licenses/>.
    9.20 +*/
    9.21 +
    9.22  #ifndef METASURF_H_
    9.23  #define METASURF_H_
    9.24  
    9.25 @@ -14,15 +32,32 @@
    9.26  struct metasurface *msurf_create(void);
    9.27  void msurf_free(struct metasurface *ms);
    9.28  
    9.29 +/* set a scalar field evaluator function */
    9.30  void msurf_eval_func(struct metasurface *ms, msurf_eval_func_t func);
    9.31 +
    9.32 +/* set a generated vertex callback function */
    9.33  void msurf_vertex_func(struct metasurface *ms, msurf_vertex_func_t func);
    9.34 +
    9.35 +/* set a generated surface normal callback function (unused yet) */
    9.36  void msurf_normal_func(struct metasurface *ms, msurf_normal_func_t func);
    9.37  
    9.38 +/* set the bounding box (default: -1, -1, -1, 1, 1, 1)
    9.39 + * keep this as tight as possible to avoid wasting grid resolution
    9.40 + */
    9.41  void msurf_bounds(struct metasurface *ms, float xmin, float ymin, float zmin, float xmax, float ymax, float zmax);
    9.42 +
    9.43 +/* resolution of the 3D evaluation grid, the bigger, the better, the slower
    9.44 + * (default: 40, 40, 40)
    9.45 + */
    9.46  void msurf_resolution(struct metasurface *ms, int xres, int yres, int zres);
    9.47 +
    9.48 +/* isosurface threshold value (default: 0) */
    9.49  void msurf_threshold(struct metasurface *ms, float thres);
    9.50  
    9.51 -void msurf_polygonize(struct metasurface *ms);
    9.52 +
    9.53 +/* finally call this to perform the polygonization */
    9.54 +int msurf_polygonize(struct metasurface *ms);
    9.55 +
    9.56  
    9.57  #ifdef __cplusplus
    9.58  }