glapi: Add API that can create a _glapi_table from a dlfcn handle

Example usage:

void *handle = dlopen(opengl_library_path, RTLD_LOCAL);
struct _glapi_table *disp = _glapi_create_table_from_handle(handle, "gl");

Signed-off-by: Jeremy Huddleston <jeremyhu@apple.com>

src/mapi/glapi/gen/Makefile

@@ -16,7 +16,8 @@ MESA_GLAPI_OUTPUTS = \
 	$(MESA_GLAPI_DIR)/glapi_mapi_tmp.h \
 	$(MESA_GLAPI_DIR)/glprocs.h \
 	$(MESA_GLAPI_DIR)/glapitemp.h \
-	$(MESA_GLAPI_DIR)/glapitable.h
+	$(MESA_GLAPI_DIR)/glapitable.h \
+	$(MESA_GLAPI_DIR)/glapi_gentable.c
 
 MESA_GLAPI_ASM_OUTPUTS = \
 	$(MESA_GLAPI_DIR)/glapi_x86.S \
@@ -50,7 +51,8 @@ XORG_GLAPI_OUTPUTS = \
 	$(XORG_GLAPI_DIR)/glprocs.h \
 	$(XORG_GLAPI_DIR)/glapioffsets.h \
 	$(XORG_GLAPI_DIR)/glapitable.h \
-	$(XORG_GLAPI_DIR)/glapidispatch.h
+	$(XORG_GLAPI_DIR)/glapidispatch.h \
+	$(XORG_GLAPI_DIR)/glapi_gentable.c
 
 XORG_OUTPUTS = \
 	$(XORG_GLAPI_FILES) \
@@ -162,6 +164,9 @@ $(MESA_GLAPI_DIR)/glapitemp.h: gl_apitemp.py $(COMMON)
 $(MESA_GLAPI_DIR)/glapitable.h: gl_table.py $(COMMON)
 	$(PYTHON2) $(PYTHON_FLAGS) $< > $@
 
+$(MESA_GLAPI_DIR)/glapi_gentable.c: gl_gentable.py $(COMMON)
+	$(PYTHON2) $(PYTHON_FLAGS) $< > $@
+
 ######################################################################
 
 $(MESA_GLAPI_DIR)/glapi_x86.S: gl_x86_asm.py $(COMMON)

src/mapi/glapi/gen/gl_gentable.py

@@ -0,0 +1,131 @@
+#!/usr/bin/env python
+
+# (C) Copyright IBM Corporation 2004, 2005
+# (C) Copyright Apple Inc. 2011
+# All Rights Reserved.
+#
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the "Software"),
+# to deal in the Software without restriction, including without limitation
+# on the rights to use, copy, modify, merge, publish, distribute, sub
+# license, and/or sell copies of the Software, and to permit persons to whom
+# the Software is furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice (including the next
+# paragraph) shall be included in all copies or substantial portions of the
+# Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
+# IBM AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+# IN THE SOFTWARE.
+#
+# Authors:
+#    Jeremy Huddleston <jeremyhu@apple.com>
+#
+# Based on code ogiginally by:
+#    Ian Romanick <idr@us.ibm.com>
+
+import license
+import gl_XML, glX_XML
+import sys, getopt
+
+header = """
+#include <dlfcn.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <GL/gl.h>
+
+#include "glapi.h"
+#include "glapitable.h"
+#include "main/dispatch.h"
+
+struct _glapi_table *
+_glapi_create_table_from_handle(void *handle, const char *symbol_prefix) {
+    struct _glapi_table *disp = calloc(1, sizeof(struct _glapi_table));
+    char symboln[512];
+
+    if(!disp)
+         return NULL;
+"""
+
+footer = """
+    return disp;
+}
+"""
+
+body_template = """
+    if(!disp->%(name)s) {
+         snprintf(symboln, sizeof(symboln), "%%s%(entry_point)s", symbol_prefix);
+         SET_%(name)s(disp, dlsym(handle, symboln));
+    }
+"""
+
+class PrintCode(gl_XML.gl_print_base):
+
+	def __init__(self):
+		gl_XML.gl_print_base.__init__(self)
+
+		self.name = "gl_gen_table.py (from Mesa)"
+		self.license = license.bsd_license_template % ( \
+"""Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
+(C) Copyright IBM Corporation 2004, 2005
+(C) Copyright Apple Inc 2011""", "BRIAN PAUL, IBM")
+
+		return
+
+
+	def get_stack_size(self, f):
+		size = 0
+		for p in f.parameterIterator():
+			if p.is_padding:
+				continue
+
+			size += p.get_stack_size()
+
+		return size
+
+
+	def printRealHeader(self):
+		print header
+		return
+
+
+	def printRealFooter(self):
+		print footer
+		return
+
+
+	def printBody(self, api):
+		for f in api.functionIterateByOffset():
+			for entry_point in f.entry_points:
+				vars = { 'entry_point' : entry_point,
+				         'name' : f.name }
+
+				print body_template % vars
+		return
+
+def show_usage():
+	print "Usage: %s [-f input_file_name]" % sys.argv[0]
+	sys.exit(1)
+
+if __name__ == '__main__':
+	file_name = "gl_API.xml"
+
+	try:
+		(args, trail) = getopt.getopt(sys.argv[1:], "m:f:")
+	except Exception,e:
+		show_usage()
+
+	for (arg,val) in args:
+		if arg == "-f":
+			file_name = val
+
+	printer = PrintCode()
+
+	api = gl_XML.parse_GL_API(file_name, glX_XML.glx_item_factory())
+	printer.Print(api)

src/mapi/glapi/glapi.h

@@ -159,6 +159,10 @@ _GLAPI_EXPORT const char *
 _glapi_get_proc_name(unsigned int offset);
 
 
+_GLAPI_EXPORT struct _glapi_table *
+_glapi_create_table_from_handle(void *handle, const char *symbol_prefix);
+
+
 _GLAPI_EXPORT unsigned long
 _glthread_GetID(void);
 

src/mapi/glapi/sources.mak

@@ -3,6 +3,7 @@
 GLAPI_SOURCES = \
 	glapi_dispatch.c \
 	glapi_entrypoint.c \
+	glapi_gentable.c \
 	glapi_getproc.c \
 	glapi_nop.c \
 	glthread.c \