1 files changed, 330 insertions, 0 deletions
diff --git a/src/net/java/games/gluegen/opengl/GLEmitter.java b/src/net/java/games/gluegen/opengl/GLEmitter.java
new file mode 100644
index 000000000..27cc07e2c
--- /dev/null
+++ b/src/net/java/games/gluegen/opengl/GLEmitter.java
@@ -0,0 +1,330 @@
+/*
+ * 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.text.MessageFormat;
+import java.util.*;
+import net.java.games.gluegen.*;
+import net.java.games.gluegen.cgram.types.*;
+
+/**
+ * A subclass of JavaEmitter that modifies the normal emission of C and Java
+ * code in order to allow a high-performance, cross-platform binding of Java
+ * to OpenGL.
+ */
+public class GLEmitter extends JavaEmitter
+{
+  public static final String PROCADDRESS_VAR_PREFIX = "_addressof_";
+  protected static final String WRAP_PREFIX = "dispatch_";
+  private TypeDictionary typedefDictionary;
+  private PrintWriter tableWriter;
+  private String tableClassName = "ProcAddressTable";
+  private int numProcAddressEntries;
+  
+  public void beginFunctions(TypeDictionary typedefDictionary,
+                             TypeDictionary structDictionary,
+                             Map            canonMap) throws Exception
+  {
+    this.typedefDictionary = typedefDictionary;
+
+    if (getConfig().emitImpl()) {
+      cWriter().println("#include <assert.h> /* this include emitted by GLEmitter.java */"); 
+      cWriter().println();
+    }
+
+    if (((GLConfiguration)getConfig()).emitProcAddressTable())
+    {
+      beginGLProcAddressTable();
+    }
+    super.beginFunctions(typedefDictionary, structDictionary, canonMap);
+  }
+
+  public void endFunctions() throws Exception
+  {
+    if (((GLConfiguration)getConfig()).emitProcAddressTable())
+    {
+      endGLProcAddressTable();
+    }
+    super.endFunctions();
+  }
+  
+  public void beginStructs(TypeDictionary typedefDictionary,
+                           TypeDictionary structDictionary,
+                           Map            canonMap) throws Exception {
+    super.beginStructs(typedefDictionary, structDictionary, canonMap);
+  }
+
+  protected JavaConfiguration createConfig() {
+    return new GLConfiguration();
+  }
+
+  protected Iterator generateMethodBindingEmitters(FunctionSymbol sym) throws Exception
+  {
+    Iterator defaultEmitters = super.generateMethodBindingEmitters(sym);
+
+    // if the superclass didn't generate any bindings for the symbol, let's
+    // honor that (for example, the superclass might have caught an Ignore
+    // direction that matched the symbol's name).
+    if (!defaultEmitters.hasNext())
+    {
+      return defaultEmitters;
+    }
+    
+    // Don't do anything special if this symbol doesn't require passing of
+    // Opengl procedure addresses in order to function correctly.
+    if (!needsProcAddressWrapper(sym) || getConfig().isUnimplemented(sym.getName()))
+    {
+      return defaultEmitters;
+    }
+
+    // 9 is default # expanded bindings for void*
+    ArrayList modifiedEmitters = new ArrayList(9); 
+
+    if (((GLConfiguration)getConfig()).emitProcAddressTable())
+    {
+      // emit an entry in the GL proc address table for this method.
+      emitGLProcAddressTableEntryForSymbol(sym);
+    }
+    
+    while (defaultEmitters.hasNext())
+    {
+      FunctionEmitter emitter = (FunctionEmitter)defaultEmitters.next();
+      if (emitter instanceof JavaMethodBindingEmitter)
+      {
+        JavaMethodBindingEmitter newEmitter =
+          generateModifiedEmitter((JavaMethodBindingEmitter)emitter);
+        if (newEmitter != null) {
+          modifiedEmitters.add(newEmitter);
+        }
+      }
+      else if (emitter instanceof CMethodBindingEmitter)
+      {
+        modifiedEmitters.add(
+          generateModifiedEmitter((CMethodBindingEmitter)emitter));
+      }
+      else
+      {
+        throw new RuntimeException("Unexpected emitter type: " +
+                                   emitter.getClass().getName());
+      }
+    }
+    
+    return modifiedEmitters.iterator();
+  }
+
+  /**
+   * Returns the name of the typedef for a pointer to the GL function
+   * represented by the argument. For example, if the argument is the function
+   * "glFuncName", the value returned will be "PFNGLFUNCNAMEPROC". This
+   * returns a valid string regardless of whether or not the typedef is
+   * actually defined.
+   */
+  static String getGLFunctionPointerTypedefName(FunctionSymbol sym)
+  {
+    String symName = sym.getName();
+    StringBuffer buf = new StringBuffer(symName.length() + 8);
+    buf.append("PFN");
+    buf.append(symName.toUpperCase());
+    buf.append("PROC");
+    return buf.toString();
+  }
+
+  //----------------------------------------------------------------------
+  // Internals only below this point
+  //
+  
+  private JavaMethodBindingEmitter generateModifiedEmitter(JavaMethodBindingEmitter baseJavaEmitter)
+  {    
+    if (!(baseJavaEmitter instanceof JavaMethodBindingImplEmitter)) {
+      // We only want to wrap the native entry point in the implementation
+      // class, not the public interface in the interface class.
+      //
+      // If the superclass has generated a "0" emitter for this routine because
+      // it needs argument conversion or similar, filter that out since we will
+      // be providing such an emitter ourselves. Otherwise return the emitter
+      // unmodified.
+      if (baseJavaEmitter.isForNIOBufferBaseRoutine())
+        return null;
+      return baseJavaEmitter;
+    }
+    return new JavaGLPAWrapperEmitter(baseJavaEmitter);
+  }
+
+  private CMethodBindingEmitter generateModifiedEmitter(CMethodBindingEmitter baseCEmitter)
+  {    
+    // The C-side JNI binding for this particular function will have an
+    // extra final argument, which is the address (the OpenGL procedure
+    // address) of the function it needs to call
+    CGLPAWrapperEmitter res = new CGLPAWrapperEmitter(baseCEmitter);
+    MessageFormat exp = baseCEmitter.getReturnValueCapacityExpression();
+    if (exp != null) {
+      res.setReturnValueCapacityExpression(exp);
+    }
+    return res;
+  }
+    
+  private boolean needsProcAddressWrapper(FunctionSymbol sym)
+  {
+    String symName =  sym.getName();
+
+    // We should only wrap the GL symbol if its function pointer typedef has
+    // been defined (most likely in glext.h).
+    String funcPointerTypedefName = getGLFunctionPointerTypedefName(sym);
+    boolean shouldWrap = typedefDictionary.containsKey(funcPointerTypedefName);
+    //System.err.println(funcPointerTypedefName + " defined: " + shouldWrap);      
+    
+    if (!shouldWrap)
+    {
+      //System.err.println("WARNING (GL): *not* run-time linking: " + sym +
+      //                   "(" + funcPointerTypedefName + " undefined)");
+    }
+    return shouldWrap;
+  }
+  
+  private void beginGLProcAddressTable() throws Exception
+  {
+    String implPackageName = getImplPackageName();
+    String jImplRoot =
+      getJavaOutputDir() + File.separator +
+      CodeGenUtils.packageAsPath(implPackageName);
+
+    // HACK: until we have a way to make the impl dir different from the
+    // WindowsGLImpl dir and the interface dir
+    //tableWriter = openFile(jImplRoot + File.separator + tableClassName + ".java");
+    File tmpFile = new File(jImplRoot);
+    tmpFile = tmpFile.getParentFile();
+    tmpFile = new File(tmpFile, tableClassName + ".java");
+    tableWriter = openFile(tmpFile.getPath());
+    // tableWriter = openFile(jImplRoot + File.separator + ".." + File.separator + tableClassName + ".java");
+
+    CodeGenUtils.emitAutogeneratedWarning(tableWriter, this);
+    
+    // HACK: until we have a way to make the impl dir different from the
+    // WindowsGLImpl dir and the interface dir
+    //tableWriter.println("package " + implPackageName + ";");
+    tableWriter.println("package " + getJavaPackageName() + ".impl;");
+    tableWriter.println();
+    tableWriter.println("/**");
+    tableWriter.println(" * This table is a cache of the native pointers to OpenGL extension");
+    tableWriter.println(" * functions, to be used for run-time linking of these extensions. ");
+    tableWriter.println(" * These pointers are obtained by the OpenGL context via a ");
+    tableWriter.println(" * platform-specific function (e.g., wglGetProcAddress() on Win32,");
+    tableWriter.println(" * glXGetProcAddress() on X11, etc).  If the member variable ");
+    tableWriter.println(" * " + PROCADDRESS_VAR_PREFIX + "glFuncName is non-zero then function");
+    tableWriter.println(" * \"glFuncName\" can be called through the associated GLContext; ");
+    tableWriter.println(" * if it is 0, then the extension is not available and cannot be called.");
+    tableWriter.println(" */");
+    tableWriter.println("public class " + tableClassName);
+    tableWriter.println("{");
+    numProcAddressEntries = 0;
+  }
+
+  private void endGLProcAddressTable() throws Exception
+  {
+    PrintWriter w = tableWriter;
+    w.print("  protected static long __PROCADDRESSINDEX__LASTINDEX = ");
+    w.print(numProcAddressEntries-1);
+    w.println(';');
+
+    w.println();
+    w.println("  /**");
+    w.println("   * This is a convenience method to get (by name) the native function ");
+    w.println("   * pointer for a given extension function. It lets you avoid ");
+    w.println("   * having to manually compute the " + PROCADDRESS_VAR_PREFIX + "<glFunctionName>");
+    w.println("   * member variable name and look it up via reflection; it also");
+    w.println("   * will throw an exception if you try to get the address of an");
+    w.println("   * unknown GL extension, or one that is statically linked ");
+    w.println("   * and therefore does not have a valid GL procedure address. ");
+    w.println("   */");
+    w.println("  public long getAddressFor(String glFunctionName) {");   
+    w.println("   String addressFieldName = net.java.games.gluegen.opengl.GLEmitter.PROCADDRESS_VAR_PREFIX + glFunctionName;");
+    w.println("   try { ");
+    w.println("      java.lang.reflect.Field addressField = this.getClass().getField(addressFieldName);");
+    w.println("      return addressField.getLong(this);");
+    w.println("    } catch (Exception e) {");
+    w.println("      // The user is calling a bogus function or one which is not runtime");
+    w.println("      // linked (extensions and core post-OpenGL 1.1 functions are runtime linked)");
+    w.println("      if (!FunctionAvailabilityCache.isPartOfGLCore(\"1.1\", glFunctionName)) ");
+    w.println("      {");
+    w.println("        throw new RuntimeException("  );
+    w.println("          \"WARNING: Address query failed for \\\"\" + glFunctionName +");
+    w.println("          \"\\\"; either it's not runtime linked or it is not a known \" +");
+    w.println("          \"OpenGL function\", e);");
+    w.println("      }");
+    w.println("   } ");
+    w.println("   assert(false); // should never get this far");
+    w.println("   return 0;");
+    w.println("   }");
+
+    w.println("} // end of class " + tableClassName);
+    w.flush();
+    w.close();
+  }
+
+  private void emitGLProcAddressTableEntryForSymbol(FunctionSymbol cFunc)
+  {
+    tableWriter.print("  public static long ");
+    tableWriter.print(PROCADDRESS_VAR_PREFIX);
+    tableWriter.print(cFunc.getName());
+    tableWriter.println(";");
+    ++numProcAddressEntries;    
+  }
+
+  protected static class GLConfiguration extends JavaConfiguration
+  {
+    private boolean emitProcAddressTable = false;
+    
+    protected void dispatch(String cmd, StringTokenizer tok, File file, String filename, int lineNo) throws IOException {
+      if (cmd.equalsIgnoreCase("EmitProcAddressTable"))
+      {
+        emitProcAddressTable =
+          readBoolean("EmitProcAddressTable", tok, filename, lineNo).booleanValue();
+      }
+      else
+      {
+        super.dispatch(cmd,tok,file,filename,lineNo);
+      }
+    }
+
+    public boolean emitProcAddressTable() { return emitProcAddressTable; }
+  } // end class GLConfiguration
+}
+