/*
* Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution 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 Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use
* in the design, construction, operation or maintenance of any nuclear
* facility.
*
* Sun gratefully acknowledges that this software was originally authored
* and developed by Kenneth Bradley Russell and Christopher John Kline.
*/
package net.java.games.gluegen.opengl;
import java.io.*;
import java.util.*;
import java.util.regex.*;
/**
* Builds the StaticGLInfo class from the OpenGL header files (i.e., gl.h
* and glext.h) whose paths were passed as arguments to {@link
* #main(String[])}.
*
* It relies upon the assumption that a function's membership is scoped by
* preprocessor blocks in the header files that match the following pattern:
* <br>
*
* <pre>
*
* #ifndef GL_XXXX
* GLAPI <returnType> <APIENTRY|GLAPIENTRY> glFuncName(<params>)
* #endif GL_XXXX
*
* </pre>
*
* For example, if it parses the following data:
*
* <pre>
*
* #ifndef GL_VERSION_1_3
* GLAPI void APIENTRY glActiveTexture (GLenum);
* GLAPI void APIENTRY glMultiTexCoord1dv (GLenum, const GLdouble *);
* GLAPI void <APIENTRY|GLAPIENTRY> glFuncName(<params>)
* #endif GL_VERSION_1_3
*
* #ifndef GL_ARB_texture_compression
* GLAPI void APIENTRY glCompressedTexImage3DARB (GLenum, GLint, GLenum, GLsizei, GLsizei, GLsizei, GLint, GLsizei, const GLvoid *);
* GLAPI void APIENTRY glCompressedTexImage2DARB (GLenum, GLint, GLenum, GLsizei, GLsizei, GLint, GLsizei, const GLvoid *);
* #endif
*
* </pre>
*
* It will associate
* <code> glActiveTexture </code> and
* <code> glMultiTexCoord1dv </code>
* with the symbol
* <code> GL_VERSION_1_3 </code>,
* and associate
* <code> glCompressedTexImage2DARB </code> and
* <code> glCompressedTexImage3DARB </code>
* with the symbol
* <code> GL_ARB_texture_compression </code>.
* */
public class BuildStaticGLInfo
{
protected static Pattern funcPattern =
Pattern.compile("^(GLAPI|extern)?(\\s*)(\\w+)(\\*)?(\\s+)(APIENTRY|WINAPI)?(\\s*)([w]?gl\\w+)\\s?(\\(.*)");
protected static Pattern associationPattern =
Pattern.compile("\\#ifndef ([W]?GL[X]?_[A-Za-z0-9_]+)");
/**
* The first argument is the package to which the StaticGLInfo class
* belongs, the second is the path to the directory in which that package's
* classes reside, and the remaining arguments are paths to the C header
* files that should be parsed
*/
public static void main(String[] args)
{
String packageName = args[0];
String packageDir = args[1];
String[] cHeaderFilePaths = new String[args.length-2];
System.arraycopy(args, 2, cHeaderFilePaths, 0, cHeaderFilePaths.length);
BuildStaticGLInfo builder = new BuildStaticGLInfo();
try
{
File file = new File(packageDir + File.separatorChar + "StaticGLInfo.java");
String parentDir = file.getParent();
if (parentDir != null)
{
File pDirFile = new File(parentDir);
pDirFile.mkdirs();
}
PrintWriter writer = new PrintWriter(new BufferedWriter(new FileWriter(file)));
builder.build(writer, packageName, cHeaderFilePaths);
writer.flush();
writer.close();
}
catch (Exception e)
{
StringBuffer buf = new StringBuffer("{ ");
for (int i = 0; i < cHeaderFilePaths.length; ++i)
{
buf.append(cHeaderFilePaths[i]);
buf.append(" ");
}
buf.append('}');
throw new RuntimeException(
"Error building StaticGLInfo.java from " + buf.toString(), e);
}
}
protected void build(PrintWriter output, String packageName, String[] cHeaderFilePaths) throws IOException
{
HashMap groupToFuncHash = new HashMap(50);
for (int i = 0; i < cHeaderFilePaths.length; ++i)
{
process(groupToFuncHash, new FileReader(cHeaderFilePaths[i]));
}
emitJavaCode(output, packageName, groupToFuncHash);
}
protected void process(HashMap groupToFuncHash, FileReader headerFile) throws IOException
{
BufferedReader reader = new BufferedReader(headerFile);
String line, activeAssociation = null;
Matcher m;
while ((line = reader.readLine()) != null)
{
// see if we're inside a #ifndef GL_XXX block and matching a function
if (activeAssociation != null && (m = funcPattern.matcher(line)).matches())
{
// We found a new function associated with the last #ifndef block we
// were associated with
String funcName = m.group(8);
HashSet funcsForGroup = (HashSet)groupToFuncHash.get(activeAssociation);
if (funcsForGroup == null)
{
funcsForGroup = new HashSet(8);
groupToFuncHash.put(activeAssociation, funcsForGroup);
}
funcsForGroup.add(funcName);
//System.err.println("FOUND ASSOCIATION FOR " + activeAssociation + ": " + funcName);
}
else if ((m = associationPattern.matcher(line)).matches())
{
// found a new #ifndef GL_XXX block
activeAssociation = m.group(1);
//System.err.println("FOUND NEW ASSOCIATION BLOCK: " + activeAssociation);
}
}
}
protected void emitJavaCode(PrintWriter output, String packageName, HashMap groupToFuncHash)
{
output.println("package " + packageName + ";");
output.println();
output.println("import java.util.*;");
output.println();
output.println("public final class StaticGLInfo");
output.println("{");
output.println(" // maps function names to the extension string or OpenGL");
output.println(" // specification version string to which they correspond.");
output.println(" private static HashMap funcToAssocMap = null;");
output.println();
output.println(" /**");
output.println(" * Returns the OpenGL extension string or GL_VERSION string with which the");
output.println(" * given function is associated. <P>");
output.println(" *");
output.println(" * If the");
output.println(" * function is part of the OpenGL core, the returned value will be");
output.println(" * GL_VERSION_XXX where XXX represents the OpenGL version of which the");
output.println(" * function is a member (XXX will be of the form \"A\" or \"A_B\" or \"A_B_C\";");
output.println(" * e.g., GL_VERSION_1_2_1 for OpenGL version 1.2.1).");
output.println(" *");
output.println(" * If the function is an extension function, the returned value will the");
output.println(" * OpenGL extension string for the extension to which the function");
output.println(" * corresponds. For example, if glLoadTransposeMatrixfARB is the argument,");
output.println(" * GL_ARB_transpose_matrix will be the value returned.");
output.println(" * Please see http://oss.sgi.com/projects/ogl-sample/registry/index.html for");
output.println(" * a list of extension names and the functions they expose.");
output.println(" *");
output.println(" * If the function specified is not part of any known OpenGL core version or");
output.println(" * extension, then NULL will be returned.");
output.println(" */");
output.println(" public static String getFunctionAssociation(String glFunctionName)");
output.println(" {");
output.println(" if (funcToAssocMap == null) { init(); }");
output.println(" return (String)funcToAssocMap.get(glFunctionName);");
output.println(" }");
output.println();
output.println(" private static void init()");
output.println(" {");
output.println(" funcToAssocMap = new HashMap(1536); // approximate max capacity");
output.println(" String group;");
ArrayList sets = new ArrayList(groupToFuncHash.keySet());
Collections.sort(sets);
for (int i = 0; i < sets.size(); ++i)
{
String groupName = (String) sets.get(i);
//System.err.println(groupName); // debug
output.println();
output.println(" //----------------------------------------------------------------");
output.println(" // " + groupName);
output.println(" //----------------------------------------------------------------");
output.println(" group = \"" + groupName + "\";");
HashSet funcs = (HashSet)groupToFuncHash.get(groupName);
Iterator funcIter = funcs.iterator();
while (funcIter.hasNext())
{
String funcName = (String)funcIter.next();
//System.err.println(" " + funcName); // debug
output.println(" funcToAssocMap.put(\"" + funcName + "\", group);");
}
}
output.println(" }");
output.println("} // end class StaticGLInfo");
}
}