X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=scripts%2Fextgen.py;h=fbb66815ae1de93102485065bace98bde781b05f;hb=67538c60b8baa6816b8ae2d343ae62d881e6c58d;hp=f349d5251473a8f147d3af9edf082a636e89a6fd;hpb=4acc43935d3b19bae688e89ed42119e326a26f2d;p=libs%2Fgl.git

diff --git a/scripts/extgen.py b/scripts/extgen.py
index f349d525..fbb66815 100755
--- a/scripts/extgen.py
+++ b/scripts/extgen.py
@@ -1,40 +1,394 @@
 #!/usr/bin/python
 
 import sys
+import os
+import xml.dom
+import xml.dom.minidom
+import itertools
 
-ext = sys.argv[1]
+### Command line processing ###
 
-funcs = []
-cur_func = None
-for line in file("gl.spec"):
-	if line[0]=='#' or line.find(':')>=0:
-		continue
-	elif line[0]=='\t' and cur_func:
+if len(sys.argv)<2:
+	print """Usage:
+  extgen.py [api] <extension> [<core_version>] [<secondary> ...]
+  extgen.py [api] <extfile> [<outfile>]
+
+Reads gl.xml and generates files to use <extension>.  Any promoted functions
+are exposed with their promoted names.  If <secondary> extensions are given,
+any promoted functions from those are pulled in as well.  <core_version> can
+be given to override the version where <extension> was promoted to core.
+
+In the second form, the parameters are read from <extfile>.  If <outfile> is
+absent, the extension's lowercased name is used.  Anything after the last dot
+in <outfile> is removed and replaced with cpp and h."""
+	sys.exit(0)
+
+target_api = "gl"
+
+i = 1
+if sys.argv[i].startswith("gl"):
+	target_api = sys.argv[i]
+	i += 1
+
+target_ext = sys.argv[i]
+out_base = None
+if target_ext.endswith(".glext"):
+	fn = target_ext
+	target_ext = None
+	core_version = None
+	secondary = []
+	for line in open(fn):
 		parts = line.split()
-		if parts[0]=="category" and parts[1]==ext:
-			funcs.append(cur_func)
+		if parts[0]=="extension":
+			target_ext = parts[1]
+		elif parts[0]=="core_version":
+			if parts[1]==target_api:
+				core_version = parts[2]
+		elif parts[0]=="secondary":
+			secondary.append(parts[1])
+	if i+1<len(sys.argv):
+		out_base = os.path.splitext(sys.argv[i+1])[0]
+else:
+	secondary = sys.argv[i+1:]
+	core_version = None
+	if secondary and secondary[0][0].isdigit():
+		core_version = secondary.pop(0)
+
+ext_type = target_ext.split('_')[0]
+backport_ext = None
+
+if core_version:
+	core_version = map(int, core_version.split('.'))
+
+if not out_base:
+	out_base = target_ext.lower()
+
+### XML file parsing ###
+
+class Thing:
+	FUNCTION = 1
+	ENUM = 2
+
+	def __init__(self, name, kind):
+		self.name = name
+		self.kind = kind
+		self.version = None
+		self.extension = None
+		self.supported_apis = {}
+		self.aliases = []
+		self.sources = []
+
+class Function(Thing):
+	def __init__(self, name):
+		Thing.__init__(self, name, Thing.FUNCTION)
+		self.return_type = "void"
+		self.params = []
+		self.typedef = None
+
+class Enum(Thing):
+	def __init__(self, name):
+		Thing.__init__(self, name, Thing.ENUM)
+		self.value = 0
+		self.bitmask = (name.endswith("_BIT") or "_BIT_" in name)
+
+class Extension:
+	def __init__(self, name):
+		self.name = name
+		self.supported_apis = []
+		self.ext_type = name[0:name.find('_')]
+
+extensions = {}
+things = {}
+
+def get_nested_elements(elem, path):
+	childElements = [c for c in elem.childNodes if c.nodeType==xml.dom.Node.ELEMENT_NODE]
+	if '/' in path:
+		head, tail = path.split('/', 1)
+		result = []
+		for c in childElements:
+			if c.tagName==head:
+				result += get_nested_elements(c, tail)
+		return result
+	else:
+		return [c for c in childElements if c.tagName==path]
+
+def get_first_child(elem, tag):
+	for c in elem.childNodes:
+		if c.nodeType==xml.dom.Node.ELEMENT_NODE and c.tagName==tag:
+			return c
+	return None
+
+def get_text_contents(node):
+	result = ""
+	for c in node.childNodes:
+		if c.nodeType==xml.dom.Node.TEXT_NODE or c.nodeType==xml.dom.Node.CDATA_SECTION_NODE:
+			result += c.data
+		else:
+			result += get_text_contents(c)
+	return result
+
+def parse_command(cmd):
+	proto = get_first_child(cmd, "proto")
+	name = get_text_contents(get_first_child(proto, "name"))
+	func = things.get(name)
+	if not func:
+		func = Function(name)
+		things[name] = func
+
+	aliases = get_nested_elements(cmd, "alias")
+	func.aliases = [a.getAttribute("name") for a in aliases]
+
+	ptype = get_first_child(proto, "ptype")
+	if ptype:
+		func.return_type = get_text_contents(ptype)
+	else:
+		for c in proto.childNodes:
+			if c.nodeType==xml.dom.Node.TEXT_NODE and c.data.strip():
+				func.return_type = c.data.strip()
+				break
+
+	params = get_nested_elements(cmd, "param")
+	func.params = map(get_text_contents, params)
+
+def parse_enum(en):
+	name = en.getAttribute("name")
+	enum = things.get(name)
+	if not enum:
+		enum = Enum(name)
+		things[name] = enum
+
+	enum.value = int(en.getAttribute("value"), 16)
+
+def parse_feature(feat):
+	api = feat.getAttribute("api")
+	version = feat.getAttribute("number")
+	if version:
+		version = map(int, version.split('.'))
+	else:
+		version = None
+
+	requires = get_nested_elements(feat, "require")
+	for req in requires:
+		commands = get_nested_elements(req, "command")
+		enums = get_nested_elements(req, "enum")
+		for t in itertools.chain(commands, enums):
+			name = t.getAttribute("name")
+			thing = things.get(name)
+			if thing:
+				thing.supported_apis.setdefault(api, version)
+
+	if not api or api==target_api:
+		removes = get_nested_elements(feat, "remove")
+		for rem in removes:
+			profile = rem.getAttribute("profile")
+			commands = get_nested_elements(rem, "command")
+			enums = get_nested_elements(rem, "enum")
+
+			for t in itertools.chain(commands, enums):
+				name = t.getAttribute("name")
+				if profile!="core" and name in things:
+					del things[name]
+
+def parse_extension(ext):
+	ext_name = ext.getAttribute("name")
+	if ext_name.startswith("GL_"):
+		ext_name = ext_name[3:]
+
+	supported = ext.getAttribute("supported").split('|')
+	if target_api not in supported and ext_name!=target_ext:
+		return
+
+	extension = extensions.get(ext_name)
+	if not extension:
+		extension = Extension(ext_name)
+		extensions[ext_name] = extension
+
+	extension.supported_apis = supported
+
+	requires = get_nested_elements(ext, "require")
+	for req in requires:
+		api = req.getAttribute("api")
+		if api:
+			supported = [api]
+		else:
+			supported = extension.supported_apis
+
+		commands = get_nested_elements(req, "command")
+		enums = get_nested_elements(req, "enum")
+		for t in itertools.chain(commands, enums):
+			name = t.getAttribute("name")
+			thing = things.get(name)
+			if thing:
+				if thing.extension and extension.name!=target_ext:
+					if thing.extension.ext_type=="ARB" or thing.extension.name==target_ext:
+						continue
+					if thing.extension.ext_type=="EXT" and extension.ext_type!="ARB":
+						continue
+
+				thing.extension = extension
+				for a in supported:
+					thing.supported_apis.setdefault(a, "ext")
+
+def parse_file(fn):
+	doc = xml.dom.minidom.parse(fn)
+	root = doc.documentElement
+
+	commands = get_nested_elements(root, "commands/command")
+	for cmd in commands:
+		parse_command(cmd)
+
+	enums = get_nested_elements(root, "enums/enum")
+	for en in enums:
+		parse_enum(en)
+
+	features = get_nested_elements(root, "feature")
+	for feat in features:
+		parse_feature(feat)
+
+	extensions = get_nested_elements(root, "extensions/extension")
+	for ext in extensions:
+		parse_extension(ext)
+
+parse_file("gl.xml")
+parse_file("gl.fixes.xml")
+
+### Additional processing ###
+
+if target_ext in extensions:
+	target_ext = extensions[target_ext]
+else:
+	print "Extension %s not found"%target_ext
+	sys.exit(1)
+
+# Find aliases for enums
+enums = [t for t in things.itervalues() if t.kind==Thing.ENUM]
+core_enums = [e for e in enums if any(v!="ext" for v in e.supported_apis.itervalues())]
+core_enums_by_value = dict((e.value, None) for e in core_enums)
+
+def get_key_api(things):
+	common_apis = set(target_ext.supported_apis)
+	for t in things:
+		common_apis.intersection_update(t.supported_apis.keys())
+	if common_apis:
+		return common_apis.pop()
 	else:
-		paren = line.find('(')
-		if paren>0:
-			cur_func = line[:paren]
+		return target_api
+
+for e in enums:
+	if all(v=="ext" for v in e.supported_apis.values()) and e.value in core_enums_by_value:
+		if core_enums_by_value[e.value] is None:
+			candidates = [ce for ce in core_enums if ce.value==e.value]
+			key_api = get_key_api(candidates)
+			core_enums_by_value[e.value] = list(sorted(candidates, key=(lambda x: x.supported_apis.get(key_api, "ext"))))
+		for ce in core_enums_by_value[e.value]:
+			if ce.bitmask==e.bitmask:
+				e.aliases.append(ce.name)
+				break
+
+# Create references from core things to their extension counterparts
+for t in things.itervalues():
+	if t.extension:
+		for a in t.aliases:
+			alias = things.get(a)
+			if alias:
+				if target_api in t.supported_apis:
+					alias.sources.insert(0, t)
+				else:
+					alias.sources.append(t)
+
+# Find the things we want to include in this extension
+def is_relevant(t):
+	# Unpromoted extension things are relevant
+	if t.extension and t.extension==target_ext and not t.aliases:
+		return True
+
+	# Core things promoted from the extension are also relevant
+	for s in t.sources:
+		if s.extension==target_ext or s.extension.name in secondary:
+			return True
+
+	return False
 
-out = file(ext.lower()+".h", "w")
-out.write("#ifndef MSP_GL_%s_\n"%ext.upper())
-out.write("#define MSP_GL_%s_\n"%ext.upper())
+funcs = [t for t in things.itervalues() if t.kind==Thing.FUNCTION and is_relevant(t)]
+funcs.sort(key=(lambda f: f.name))
+enums = filter(is_relevant, enums)
+enums.sort(key=(lambda e: e.value))
+
+# Some final preparations for creating the files
+for t in itertools.chain(funcs, enums):
+	if target_api in t.supported_apis and t.supported_apis[target_api]!="ext":
+		t.version = t.supported_apis[target_api]
+	if not core_version:
+		core_version = t.version
+
+	# Things in backport extensions don't acquire an extension suffix
+	if t.extension and not t.name.endswith(ext_type) and target_api in t.supported_apis:
+		backport_ext = t.extension
+
+for f in funcs:
+	f.typedef = "FPtr_%s"%f.name
+
+if target_api in target_ext.supported_apis:
+	source_ext = target_ext
+else:
+	candidates = {}
+	for t in itertools.chain(funcs, enums):
+		for s in t.sources:
+			if target_api in s.supported_apis:
+				candidates[s.extension.name] = candidates.get(s.extension.name, 0)+1
+	if candidates:
+		source_ext = extensions[max(candidates.iteritems(), key=(lambda x: x[1]))[0]]
+	else:
+		source_ext = None
+
+### Output ###
+
+out = file(out_base+".h", "w")
+out.write("#ifndef MSP_GL_%s_\n"%target_ext.name.upper())
+out.write("#define MSP_GL_%s_\n"%target_ext.name.upper())
 
 out.write("""
-#include "gl.h"
-#include <GL/glext.h>
+#include <msp/gl/extension.h>
+#include <msp/gl/gl.h>
 
 namespace Msp {
 namespace GL {
 
 """)
 
-for f in funcs:
-	out.write("extern PFNGL%sPROC gl%s;\n"%(f.upper(), f))
+if funcs or enums:
+	if funcs:
+		for f in funcs:
+			out.write("typedef %s (*%s)(%s);\n"%(f.return_type, f.typedef, ", ".join(f.params)))
+		out.write("\n")
 
-out.write("\nvoid init_%s();\n"%ext.lower())
+	if enums:
+		api_prefix = "GL"
+		if target_api=="gles2":
+			api_prefix = "GL_ES"
+
+		enums_by_category = {}
+		for e in enums:
+			cat = None
+			if e.version:
+				cat = api_prefix+"_VERSION_"+"_".join(map(str, e.version))
+			elif e.extension:
+				cat = "GL_"+e.extension.name
+			enums_by_category.setdefault(cat, []).append(e)
+
+		for cat in sorted(enums_by_category.keys()):
+			if cat:
+				out.write("#ifndef %s\n"%cat)
+			for e in enums_by_category[cat]:
+				out.write("#define %s 0x%04X\n"%(e.name, e.value))
+			if cat:
+				out.write("#endif\n")
+			out.write("\n")
+
+	for f in funcs:
+		out.write("extern %s %s;\n"%(f.typedef, f.name))
+
+out.write("extern Extension %s;\n"%target_ext.name)
 
 out.write("""
 } // namespace GL
@@ -43,10 +397,17 @@ out.write("""
 #endif
 """)
 
-out = file(ext.lower()+".cpp", "w")
-out.write("#include \"extension.h\"\n")
-out.write("#include \"%s.h\"\n"%ext.lower())
+out = file(out_base+".cpp", "w")
+out.write("#include \"%s.h\"\n"%target_ext.name.lower())
 
+if funcs:
+	out.write("""
+#ifdef __APPLE__
+#define GET_PROC_ADDRESS(x) ::x
+#else
+#define GET_PROC_ADDRESS(x) get_proc_address(#x)
+#endif
+""")
 out.write("""
 namespace Msp {
 namespace GL {
@@ -54,13 +415,34 @@ namespace GL {
 """)
 
 for f in funcs:
-	out.write("PFNGL%sPROC gl%s = 0;\n"%(f.upper(), f))
+	out.write("%s %s = 0;\n"%(f.typedef, f.name))
 
-out.write("\nvoid init_%s()\n{\n"%ext.lower())
-for f in funcs:
-	out.write("\tgl%s = reinterpret_cast<PFNGL%sPROC>(get_proc_address(\"gl%s\"));\n"%(f, f.upper(), f))
+out.write("\nExtension::SupportLevel init_%s()\n{\n"%target_ext.name.lower())
+if core_version:
+	out.write("\tif(is_version_at_least(%d, %d)"%tuple(core_version))
+	if backport_ext:
+		out.write(" || is_supported(\"GL_%s\")"%backport_ext.name)
+	out.write(")\n\t{\n")
+	for f in funcs:
+		if f.version or target_api in f.supported_apis:
+			out.write("\t\t%s = reinterpret_cast<%s>(GET_PROC_ADDRESS(%s));\n"%(f.name, f.typedef, f.name))
+	out.write("\t\treturn Extension::CORE;\n")
+	out.write("\t}\n")
+if source_ext and source_ext!=backport_ext:
+	out.write("\tif(is_supported(\"GL_%s\"))\n\t{\n"%(source_ext.name))
+	for f in funcs:
+		s = f
+		if f.sources:
+			s = f.sources[0]
+		if s.version or target_api in s.supported_apis:
+			out.write("\t\t%s = reinterpret_cast<%s>(GET_PROC_ADDRESS(%s));\n"%(f.name, f.typedef, s.name))
+	out.write("\t\treturn Extension::EXTENSION;\n")
+	out.write("\t}\n")
+out.write("\treturn Extension::UNSUPPORTED;\n")
 out.write("}\n")
 
+out.write("\nExtension %s(\"GL_%s\", init_%s);\n"%(target_ext.name, target_ext.name, target_ext.name.lower()))
+
 out.write("""
 } // namespace GL
 } // namespace Msp