Add first version of regression suite (python parts only). Work in progress.

git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@597 67173fc5-114c-0410-ac8e-9d2fd5bffc1f

test/regression/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>assimp-regression</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.python.pydev.PyDevBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.python.pydev.pythonNature</nature>
+	</natures>
+</projectDescription>

test/regression/.pydevproject

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<?eclipse-pydev version="1.0"?>
+
+<pydev_project>
+<pydev_property name="org.python.pydev.PYTHON_PROJECT_VERSION">python 3.0</pydev_property>
+<pydev_property name="org.python.pydev.PYTHON_PROJECT_INTERPRETER">Default</pydev_property>
+</pydev_project>

test/regression/README

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+Assimp Regression Test Suite
+============================
+
+1) How does it work?
+---------------------------------------------------------------------------------
+run.py checks all model in the <root>/test/models folder and compares the result
+against a regression database provided by us (db.zip). If the test passes
+successfully, Assimp definitely WORKS perfectly on your system. A few failures
+are totally fine as well (see sections 7+). You need to worry if a huge
+majority of all files in a particular format or post-processing configuration 
+fails - this might be a sign of a recent regression in assimp's codebase. 
+
+2) What do I need?
+---------------------------------------------------------------------------------
+ - you need Python installed - 3.x !!
+ - you need to build tools/assimp_cmd as described in the INSTALL file (
+	make && make install on unixes,release-dll target with msvc).
+
+3) How to add more test files?
+---------------------------------------------------------------------------------
+Use the following procedure:
+ - verify the correctness of your assimp build - run the regression suite.
+   DO NOT continue if one or more tests fail.
+ - add your additional test files to <root>/test/models/<fileformat>, where
+   <fileformat> is the file type (typically the file extension)
+ - rebuild the regression database using gen_db.py
+ - run the regression suite again - all tests should pass, including
+   those for the new files.
+
+ - contributors: commit the db.zip plus your additional test files to
+   the SVN repository. 
+
+4) I made a change/fix/.. to a loader, how to update the database?
+---------------------------------------------------------------------------------
+ - rebuild the regression database using gen_db.py
+ - run the suite - all tests should pass now. If they do not, don't continue
+ 
+ - contributors: commit the db.zip to the SVN repository 
+
+5) How to add my whole model repository to the suite?
+---------------------------------------------------------------------------------
+
+Edit the reg_settings.py file and add the path to your repository to
+<<model_directories>>. Then, rebuild the suite.
+
+6) So what is actually verified?
+---------------------------------------------------------------------------------
+The regression database includes mini dumps of the aiScene data structure -
+the scene hierarchy plus the sizes of all data arrays MUST match. Floating-point
+data buffers, such as vertex positions, are handled less strictly: min,max and
+average values are stored with lower precision. This takes hardware- or 
+compiler-specific differences in floating-point computations into account. 
+Generally, almost all significant regressions will be detected while the
+number of false positives is relatively low.
+
+7) The test suite fails, what do do?
+---------------------------------------------------------------------------------
+Get back to ../results and check out regression_suite_failures.txt 
+It contains a list of all files which failed the test ... they're copied to
+../results/tmp. Both an EXPECTED and an ACTUAL file is produced per test.
+The output of `assimp cmpdump` is written to regressions_suite_output.txt. 
+To quickly find all all reports pertaining to tests which failed, I'd
+recommend grepping for 'but' because its a constituent of all error messages
+produced by assimp_cmd :) Error reports contain detailed information
+regarding the point of failure inside the data structure, the values of
+the two corresponding fields that were found to be different from EXPECTED
+and ACTUAL, respectively, ... this should offer you enough information to start
+debugging.
+
+8) fp:fast vs fp:precise fails the test suite (same for gcc equivalents)
+---------------------------------------------------------------------------------
+As mentioned above, floating-point inaccuracies between differently optimized
+builds are not considered regressions and all float comparisons done by the test
+suite involve an epsilon. Changing floating-point optimizations can, however,
+ lead to *real* changes in the output data structure, such as different number 
+of vertices or faces, ... this violates one of our primary targets, that is
+produce reliable and portable output. We're working hard on removing these
+issues, but at the moment you have to live with few of them.
+
+Currently, the regression database is build on Windows using MSVC8 with 
+fp:precise. This leads to a small number of failures with fp:fast and
+virtally every build with gcc. Be patient, it will be fixed.
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+

test/regression/gen_db.py

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+#!/usr/bin/env python3
+# -*- Coding: UTF-8 -*-
+
+# ---------------------------------------------------------------------------
+# Open Asset Import Library (ASSIMP)
+# ---------------------------------------------------------------------------
+#
+# Copyright (c) 2006-2010, ASSIMP Development Team
+#
+# All rights reserved.
+#
+# Redistribution and use of this software in source and binary forms, 
+# with or without modification, are permitted provided that the following 
+# conditions are met:
+# 
+# * Redistributions of source code must retain the above
+#   copyright notice, this list of conditions and the
+#   following disclaimer.
+# 
+# * Redistributions in binary form must reproduce the above
+#   copyright notice, this list of conditions and the
+#   following disclaimer in the documentation and/or other
+#   materials provided with the distribution.
+# 
+# * Neither the name of the ASSIMP team, nor the names of its
+#   contributors may be used to endorse or promote products
+#   derived from this software without specific prior
+#   written permission of the ASSIMP Development Team.
+# 
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+# ---------------------------------------------------------------------------
+
+"""Generate the regression database db.zip from the files in the <root>
+/test/models directory. Older databases are overwritten with no prompt.
+"""
+
+import sys
+import os
+import subprocess
+import zipfile
+
+import settings
+import utils
+
+# -------------------------------------------------------------------------------
+def process_dir(d, outfile, file_filter):
+    """ Generate small dump records for all files in 'd' """
+    print("Processing directory " + d)
+    for f in os.listdir(d):
+        fullp = os.path.join(d, f)
+        if os.path.isdir(fullp) and not f == ".svn":
+            process_dir(fullp, outfile, file_filter)
+            continue
+
+        if file_filter(f):
+            for pp in settings.pp_configs_to_test:
+                print("DUMP " + fullp + "\n post-processing: " + pp)
+                outf = os.path.join(os.getcwd(), settings.database_name,
+                    utils.hashing(fullp, pp))
+
+                cmd = utils.assimp_bin_path + " dump \"" + fullp + \
+                    "\" " + outf + " -b -s " + pp
+
+                outfile.write("assimp dump "+"-"*80+"\n")
+                outfile.flush()
+                if subprocess.call(cmd, stdout=outfile, stderr=outfile, shell=False):
+                    print("Failure processing " + fullp)
+                    
+
+# -------------------------------------------------------------------------------
+def make_zip():
+    """Zip the contents of ./<settings.database_name>"""
+    zipout = zipfile.ZipFile(settings.database_name + ".zip", "w", zipfile.ZIP_DEFLATED)
+    for f in os.listdir(settings.database_name):
+        p = os.path.join(settings.database_name, f)
+        zipout.write(p, f)
+        if settings.remove_old:
+            os.remove(p)
+
+    if settings.remove_old:
+        os.rmdir(settings.database_name)
+
+    bad = zipout.testzip()
+    assert bad is None
+    
+
+# -------------------------------------------------------------------------------
+def gen_db():
+    """Generate the crash dump database in ./<settings.database_name>"""
+    try:
+        os.mkdir(settings.database_name)
+    except OSError:
+        pass
+    
+    outfile = open(os.path.join("..", "results", "gen_regression_db_output.txt"), "w")
+    (ext_list, err) = subprocess.Popen([utils.assimp_bin_path, "listext"],
+        stdout=subprocess.PIPE).communicate()
+    
+    ext_list = str(ext_list).lower().split(";")
+    ext_list = list(filter(
+        lambda f: not f in settings.exclude_extensions, map(
+            lambda f: f.strip("b* \'"), ext_list)))
+
+    print(ext_list)
+    for tp in settings.model_directories:
+        process_dir(tp, outfile,
+            lambda x: os.path.splitext(x)[1] in ext_list)
+        
+
+# -------------------------------------------------------------------------------
+if __name__ == "__main__":
+    utils.find_assimp_or_die()
+    gen_db()
+    make_zip()
+
+    print("="*60)
+    input("Press any key to continue")
+    
+# vim: ai ts=4 sts=4 et sw=4    
+

test/regression/run.py

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+#!/usr/bin/env python3
+# -*- Coding: UTF-8 -*-
+
+# ---------------------------------------------------------------------------
+# Open Asset Import Library (ASSIMP)
+# ---------------------------------------------------------------------------
+#
+# Copyright (c) 2006-2010, ASSIMP Development Team
+#
+# All rights reserved.
+#
+# Redistribution and use of this software in source and binary forms, 
+# with or without modification, are permitted provided that the following 
+# conditions are met:
+# 
+# * Redistributions of source code must retain the above
+#   copyright notice, this list of conditions and the
+#   following disclaimer.
+# 
+# * Redistributions in binary form must reproduce the above
+#   copyright notice, this list of conditions and the
+#   following disclaimer in the documentation and/or other
+#   materials provided with the distribution.
+# 
+# * Neither the name of the ASSIMP team, nor the names of its
+#   contributors may be used to endorse or promote products
+#   derived from this software without specific prior
+#   written permission of the ASSIMP Development Team.
+# 
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+# ---------------------------------------------------------------------------
+
+"""
+Run the regression test suite using the settings from settings.py.
+
+"""
+
+import sys
+import os
+import subprocess
+import zipfile
+import collections
+
+import settings
+import utils
+
+# -------------------------------------------------------------------------------
+EXPECTED_FAILURE_NOT_MET, DATABASE_LENGTH_MISMATCH, \
+DATABASE_VALUE_MISMATCH, IMPORT_FAILURE, \
+FILE_NOT_READABLE, COMPARE_SUCCESS = range(6)
+
+messages = collections.defaultdict(lambda: "<unknown", {
+        EXPECTED_FAILURE_NOT_MET:
+"""Unexpected success during import\n\
+\tReturn code was 0""",
+
+        DATABASE_LENGTH_MISMATCH:
+"""Database mismatch: lengths don't match\n\
+\tExpected: {0} Actual: {1}""",
+
+        DATABASE_VALUE_MISMATCH:
+"""Database mismatch: """,
+
+        IMPORT_FAILURE:
+"""Unexpected failure during import\n\
+\tReturn code was {0}""",
+
+        FILE_NOT_READABLE:
+"""Unexpected failure reading file""",
+
+        COMPARE_SUCCESS:
+"""Results match archived reference dump in database\n\
+\tNumber of bytes compared: {0}"""
+})
+
+outfilename_output = "run_regression_suite_output.txt"
+outfilename_failur = "run_regression_suite_failures.csv"
+# -------------------------------------------------------------------------------
+class results:
+    
+    """ Handle formatting of results"""
+
+    def __init__(self, zipin):
+        """Init, given a ZIPed database """
+        self.failures = []
+        self.success = []
+        self.zipin = zipin
+    
+    
+    def fail(self, failfile, filename_expect, pp, msg, *args):
+        """
+        Report failure of a sub-test
+        
+        File f failed a test for pp config pp, failure notice is msg, 
+        *args is format()ting args for msg
+        
+        """
+        print("[FAILURE] " + messages[msg].format(*args))
+        self.failures.append((failfile, filename_expect, pp))
+
+
+    def ok(self, f, pp, msg, *args):
+        """
+        Report success of a sub-test
+
+        File f passed the test, msg is a happy success note, 
+        *args is format()ing args for msg.
+
+        """
+        print("[SUCCESS] " + messages[msg].format(*args)) 
+        self.success.append(f)
+
+
+    def report_results(self):
+        """Write results to ../results/run_regression_suite_failures.txt"""
+
+        print("\n" + ('='*60) + "\n" + "SUCCESS: {0}\r\nFAILURE: {1}".format(
+            len(self.success), len(self.failures)) + 
+              "\n" + ('='*60) + "\n")
+
+        with open(os.path.join('..', 'results',outfilename_failur), "wt") as f:
+            f.write("ORIGINAL FILE;EXPECTED DUMP\n")
+            f.writelines(map(
+                lambda x: x[0] + ' ' + x[2] + ";" + x[1] + "\n", self.failures))
+        
+        if self.failures:
+           print("\nSee " + settings.results + "\\" + outfilename_failur 
+                 + " for more details\n\n") 
+    
+# -------------------------------------------------------------------------------
+def mkoutputdir_andgetpath(fullpath, myhash, app):
+    outfile = os.path.join(settings.results, "tmp", os.path.split(fullpath)[1] + "_" + myhash)
+    try:
+        os.mkdir(outfile)
+    except OSError:
+        pass
+    
+    outfile = os.path.join(outfile, app)
+    return outfile
+
+
+# -------------------------------------------------------------------------------
+def process_dir(d, outfile_results, zipin, result):
+    shellparams = {'stdout':outfile_results, 'stderr':outfile_results, 'shell':False}
+
+    print("Processing directory " + d)
+    for f in os.listdir(d):
+        fullpath = os.path.join(d, f)
+        if os.path.isdir(fullpath) and not f == ".svn":
+            process_dir(fullpath, outfile_results, zipin, result)
+            continue
+
+        for pppreset in settings.pp_configs_to_test:
+            filehash = utils.hashing(fullpath, pppreset)
+            failure = False
+            try:
+                input_expected = zipin.open(filehash, "r").read()
+                # empty dump files indicate 'expected import failure'
+                if not len(input_expected):
+                   failure = True
+            except KeyError:
+                #print("Didn't find "+fullpath+" (Hash is "+filehash+") in database")
+                continue
+
+            print("-"*60 + "\n  " + os.path.realpath(fullpath) + " pp: " + pppreset) 
+            
+            outfile_actual = mkoutputdir_andgetpath(fullpath, filehash, "ACTUAL")
+            outfile_expect = mkoutputdir_andgetpath(fullpath, filehash, "EXPECT")
+            outfile_results.write("assimp dump    "+"-"*80+"\n")
+            outfile_results.flush()
+            command = utils.assimp_bin_path + " dump \"" + fullpath + \
+                "\" " + outfile_actual + " -b -s " + pppreset
+            r = subprocess.call(command, **shellparams)
+
+            if r and not failure:
+                result.fail(fullpath, outfile_expect, pppreset, IMPORT_FAILURE, r)
+                continue
+            elif failure:
+                result.fail(fullpath, outfile_expect, pppreset, EXPECTED_FAILURE_NOT_MET)
+                continue
+            
+            with open(outfile_expect, "wb") as s:
+                s.write(input_expected) 
+                
+            with open(outfile_actual, "rb") as s:
+                input_actual = s.read() 
+                
+            if len(input_expected) != len(input_actual):
+                result.fail(fullpath, outfile_expect, pppreset, DATABASE_LENGTH_MISMATCH,
+                        len(input_expected), len(input_actual))
+                continue
+
+            outfile_results.write("assimp cmpdump "+"-"*80+"\n")
+            outfile_results.flush()
+            command = utils.assimp_bin_path + ' cmpdump "' + outfile_actual + '" "' \
+                + outfile_expect + '"'
+            
+            if subprocess.call(command, **shellparams) != 0:
+                result.fail(fullpath, outfile_expect, pppreset, DATABASE_VALUE_MISMATCH)
+                continue 
+            result.ok(fullpath, pppreset, COMPARE_SUCCESS, len(input_expected))     
+
+# -------------------------------------------------------------------------------
+def del_folder_with_contents(folder):
+    for root, dirs, files in os.walk(folder, topdown=False):
+        for name in files:
+            os.remove(os.path.join(root, name))
+        for name in dirs:
+            os.rmdir(os.path.join(root, name))
+    
+
+# -------------------------------------------------------------------------------
+def run_test():
+    utils.find_assimp_or_die()
+    tmp_target_path = os.path.join(settings.results, "tmp")
+    try: 
+        os.mkdir(tmp_target_path) 
+    except OSError as oerr:
+        # clear contents if tmp folder exists already
+       del_folder_with_contents(tmp_target_path)
+
+    try:
+        zipin = zipfile.ZipFile(settings.database_name + ".zip",
+            "r", zipfile.ZIP_STORED)
+    
+    except IOError:
+        print("Regression database ", settings.database_name,
+              ".zip was not found")
+        return
+
+    res = results(zipin)
+    with open(os.path.join(settings.results, outfilename_output), "wt") as outfile:
+        for tp in settings.model_directories:
+            process_dir(tp, outfile, zipin, res)
+
+    res.report_results()
+
+# -------------------------------------------------------------------------------
+if __name__ == "__main__":
+    run_test()
+    input("Press any key to continue ...")
+
+# vim: ai ts=4 sts=4 et sw=4

test/regression/settings.py

@@ -0,0 +1,110 @@
+#!/usr/bin/env python3
+# -*- Coding: UTF-8 -*-
+
+# ---------------------------------------------------------------------------
+# Open Asset Import Library (ASSIMP)
+# ---------------------------------------------------------------------------
+#
+# Copyright (c) 2006-2010, ASSIMP Development Team
+#
+# All rights reserved.
+#
+# Redistribution and use of this software in source and binary forms, 
+# with or without modification, are permitted provided that the following 
+# conditions are met:
+# 
+# * Redistributions of source code must retain the above
+#   copyright notice, this list of conditions and the
+#   following disclaimer.
+# 
+# * Redistributions in binary form must reproduce the above
+#   copyright notice, this list of conditions and the
+#   following disclaimer in the documentation and/or other
+#   materials provided with the distribution.
+# 
+# * Neither the name of the ASSIMP team, nor the names of its
+#   contributors may be used to endorse or promote products
+#   derived from this software without specific prior
+#   written permission of the ASSIMP Development Team.
+# 
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+# ---------------------------------------------------------------------------
+
+"""Shared settings for the regression suite (bold builder and
+test scripts rely on this)
+
+"""
+
+import os
+# -------------------------------------------------------------------------------
+# List of file extensions to be excluded from the regression suite
+# File extensions are case insensitive
+# -------------------------------------------------------------------------------
+exclude_extensions = [".lws",".assbin",".assxml"]
+
+# -------------------------------------------------------------------------------
+# Post processing configurations to be included in the test. The
+# strings are parameters for assimp_cmd, see assimp_cmd's doxydoc
+# for more details. 
+
+# The defaults are (validate-data-structure is always enabled, for
+# self-explanatory reasons :-):
+#
+# '-cfull'    :apply all post processing except 'og' (optimize-scenegraph)
+# '-og -om'   :run optimize-scenegraph in combination with optimize-meshes.
+# '-vds -jiv' :join-identical-vertices alone. This is a hotspot where
+#              floating-point inaccuracies can cause severe damage.
+
+# As you can see, not all possible combinations of pp steps are covered - 
+# but at least each step is executed at least once on each model. 
+# -------------------------------------------------------------------------------
+pp_configs_to_test = [
+    "-cfull",
+    "-og -om -vds",
+    "-vds -jiv"
+]
+# -------------------------------------------------------------------------------
+# Name of the regression database file to be used
+# gen_db.py writes to this directory, run.py checks against this directory.
+# If a zip file with the same name exists, its contents are favoured to a 
+# normal directory, so in order to test against unzipped files the ZIP needs
+# to be deleted.
+# -------------------------------------------------------------------------------
+database_name = "db"
+
+# -------------------------------------------------------------------------------
+# List of directories to be processed. Paths are processed recursively.
+# -------------------------------------------------------------------------------
+model_directories = [
+os.path.join("..","models")
+]
+
+# -------------------------------------------------------------------------------
+# Remove the original database files after the ZIP has been built?
+# -------------------------------------------------------------------------------
+remove_old = True
+
+# -------------------------------------------------------------------------------
+# Bytes to skip at the beginning of a dump. This skips the file header, which
+# is currently the same 500 bytes header for both assbin, assxml and minidumps.
+# -------------------------------------------------------------------------------
+dump_header_skip = 500
+
+# -------------------------------------------------------------------------------
+# Directory to write all results and logs to. The dumps pertaining to failed
+# tests are written to a subfolder of this directory ('tmp').
+# -------------------------------------------------------------------------------
+results = os.path.join("..","results")
+
+
+# vim: ai ts=4 sts=4 et sw=4

test/regression/utils.py

@@ -0,0 +1,108 @@
+#!/usr/bin/env python3
+# -*- Coding: UTF-8 -*-
+
+# ---------------------------------------------------------------------------
+# Open Asset Import Library (ASSIMP)
+# ---------------------------------------------------------------------------
+#
+# Copyright (c) 2006-2010, ASSIMP Development Team
+#
+# All rights reserved.
+#
+# Redistribution and use of this software in source and binary forms, 
+# with or without modification, are permitted provided that the following 
+# conditions are met:
+# 
+# * Redistributions of source code must retain the above
+#   copyright notice, this list of conditions and the
+#   following disclaimer.
+# 
+# * Redistributions in binary form must reproduce the above
+#   copyright notice, this list of conditions and the
+#   following disclaimer in the documentation and/or other
+#   materials provided with the distribution.
+# 
+# * Neither the name of the ASSIMP team, nor the names of its
+#   contributors may be used to endorse or promote products
+#   derived from this software without specific prior
+#   written permission of the ASSIMP Development Team.
+# 
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+# ---------------------------------------------------------------------------
+
+"""Shared stuff for the gen_db and run scripts """
+
+# -------------------------------------------------------------------------------
+def hashing(file,pp):
+    """ Map an input file and a postprocessing config to an unique hash.
+
+    The hash is used to store the item in the database. The buildin
+    hash() function is used. The hash is a string.
+
+    """
+    return hex(hash(file+":"+pp))
+
+
+assimp_bin_path = None
+# -------------------------------------------------------------------------------
+def find_assimp_or_die():
+    """Find assimp_cmd's binary for the current platform.
+    
+    The path to the binary is stored in assimp_bin_path, the process
+    is aborted if it can't be found.
+
+    """
+
+    import os
+    import platform
+    import sys
+
+    def locate_file(f_list):
+        for f in f_list:
+            try:
+                fl = open(f,"rb")
+            except IOError:
+                continue
+            fl.close()
+            return f
+        return None
+
+    global assimp_bin_path
+    if os.name == "nt":
+        if platform.machine() == "x86":
+            search = [os.path.join("..","..","bin","assimpcmd_release-dll_Win32","assimp.exe"),
+                os.path.join("..","..","bin","x86","assimp")]
+            
+        else: # amd64, hopefully
+            search = [os.path.join("..","..","bin","assimpcmd_release-dll_x64","assimp.exe"),
+                os.path.join("..","..","bin","x64","assimp")]
+        
+    elif os.name == "posix":
+        search = [os.path.join("..","..","bin","gcc","assimp"),
+            os.path.join("/usr","local","bin")]
+    else:
+        print("Unsupported operating system")
+        sys.exit(-5)
+
+    assimp_bin_path = locate_file(search)
+    if assimp_bin_path is None:
+        print("Can't locate assimp_cmd binary")
+        sys.exit(-5)
+
+    print("Located assimp/assimp_cmd binary at ",assimp_bin_path)
+
+
+if __name__ == '__main__':
+    find_assimp_or_die()
+
+ # vim: ai ts=4 sts=4 et sw=4