import os
import xml.dom
import xml.dom.minidom
+import itertools
+
+### Command line processing ###
if len(sys.argv)<2:
print """Usage:
- extgen.py <extension> [<version>] [<secondary> ...]"
+ extgen.py <extension> [<core_version>] [<secondary> ...]
+ extgen.py <extfile> [<outfile>]
-Reads gl.spec and generates files to use <extension>. Any promoted functions
+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. <version> can be
-given to override the version where <extension> was promoted to core."""
+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)
-ext = sys.argv[1]
+target_ext = sys.argv[1]
out_base = None
-if ext.endswith(".glext"):
- fn = ext
- ext = None
- ver = 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]=="extension":
- ext = parts[1]
+ target_ext = parts[1]
elif parts[0]=="core_version":
- ver = parts[1]
+ core_version = parts[1]
elif parts[0]=="secondary":
secondary.append(parts[1])
if len(sys.argv)>=3:
out_base = os.path.splitext(sys.argv[2])[0]
else:
secondary = sys.argv[2:]
- ver = None
+ core_version = None
if secondary and secondary[0][0].isdigit():
- ver = secondary.pop(0)
+ core_version = secondary.pop(0)
+
+ext_type = target_ext.split('_')[0]
+backport_ext = None
-exttype = ext.split('_')[0]
-bp_ext = None
+if core_version:
+ core_version = map(int, core_version.split('.'))
if not out_base:
- out_base = ext.lower()
+ out_base = target_ext.lower()
-class Function:
- def __init__(self, name):
+### XML file parsing ###
+
+class Thing:
+ FUNCTION = 1
+ ENUM = 2
+
+ def __init__(self, name, kind):
self.name = name
- self.typedef = None
+ self.kind = kind
self.version = None
- self.category = None
- self.vectorequiv = None
+ self.extension = None
self.aliases = []
- self.extfunc = None
+ self.source = None
+
+class Function(Thing):
+ def __init__(self, name):
+ Thing.__init__(self, name, Thing.FUNCTION)
+ self.return_type = "void"
+ self.params = []
+ self.typedef = None
-funcs = {}
-cur_func = None
+class Enum(Thing):
+ def __init__(self, name):
+ Thing.__init__(self, name, Thing.ENUM)
+ self.value = 0
+
+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 e in elem.getElementsByTagName(head):
- result += get_nested_elements(e, tail)
+ for c in childElements:
+ if c.tagName==head:
+ result += get_nested_elements(c, tail)
return result
else:
- return elem.getElementsByTagName(path)
+ 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 = ""
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")
+ if api=="gl":
+ version = feat.getAttribute("number")
+ if version:
+ version = map(int, version.split('.'))
+ else:
+ version = None
+
+ commands = get_nested_elements(feat, "require/command")
+ enums = get_nested_elements(feat, "require/enum")
+ for t in itertools.chain(commands, enums):
+ name = t.getAttribute("name")
+ thing = things.get(name)
+ if thing:
+ thing.version = version
+
+ if feat.getAttribute("name")=="MSPGL_REMOVE":
+ commands = get_nested_elements(feat, "remove/command")
+ enums = get_nested_elements(feat, "remove/enum")
+ for t in itertools.chain(commands, enums):
+ name = t.getAttribute("name")
+ if 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 "gl" in supported:
+ commands = get_nested_elements(ext, "require/command")
+ enums = get_nested_elements(ext, "require/enum")
+ for t in itertools.chain(commands, enums):
+ name = t.getAttribute("name")
+ thing = things.get(name)
+ if thing:
+ thing.extension = ext_name
+
def parse_file(fn):
doc = xml.dom.minidom.parse(fn)
root = doc.documentElement
+
commands = get_nested_elements(root, "commands/command")
for cmd in commands:
- name = get_text_contents(get_nested_elements(cmd, "proto/name")[0])
- func = funcs.get(name)
- if not func:
- func = Function(name)
- funcs[name] = func
-
- aliases = cmd.getElementsByTagName("alias")
- for a in aliases:
- func.aliases.append(a.getAttribute("name"))
+ parse_command(cmd)
- vec = cmd.getElementsByTagName("vecequiv")
- if vec:
- func.vectorequiv = vec[0].getAttribute("name")
+ enums = get_nested_elements(root, "enums/enum")
+ for en in enums:
+ parse_enum(en)
- features = root.getElementsByTagName("feature")
+ features = get_nested_elements(root, "feature")
for feat in features:
- api = feat.getAttribute("api")
- if api=="gl":
- version = feat.getAttribute("number")
-
- commands = get_nested_elements(feat, "require/command")
- for c in commands:
- name = c.getAttribute("name")
- func = funcs.get(name)
- if func:
- func.version = version
-
- if feat.getAttribute("name")=="MSPGL_REMOVE":
- commands = get_nested_elements(feat, "remove/command")
- for c in commands:
- name = c.getAttribute("name")
- if name in funcs:
- del funcs[name]
+ parse_feature(feat)
extensions = get_nested_elements(root, "extensions/extension")
for ext in extensions:
- ext_name = ext.getAttribute("name")
- if ext_name.startswith("GL_"):
- ext_name = ext_name[3:]
- supported = ext.getAttribute("supported").split('|')
- if "gl" in supported:
- commands = get_nested_elements(ext, "require/command")
- for c in commands:
- name = c.getAttribute("name")
- func = funcs.get(name)
- if func:
- func.category = ext_name
+ parse_extension(ext)
parse_file("gl.xml")
parse_file("gl.fixes.xml")
-for f in funcs.itervalues():
- if f.category==ext or f.category in secondary:
- for a in f.aliases:
- aliasfunc = funcs.get(a)
- if aliasfunc:
- aliasfunc.extfunc = f
-
-def is_relevant(f):
- if f.category==ext and not f.aliases:
+### Additional processing ###
+
+# Find aliases for enums
+enums = [t for t in things.itervalues() if t.kind==Thing.ENUM]
+core_enums_by_value = dict((e.value, e) for e in enums if e.version)
+
+for e in enums:
+ if e.kind==t.ENUM and e.extension:
+ ce = core_enums_by_value.get(e.value)
+ if ce and ce!=e:
+ e.aliases.append(ce.name)
+
+# Create references from core things to their extension counterparts
+for t in things.itervalues():
+ if t.extension==target_ext or t.extension in secondary:
+ for a in t.aliases:
+ alias = things.get(a)
+ if alias:
+ alias.source = t
+
+def is_relevant(t):
+ # Unpromoted extension things are relevant
+ if t.extension==target_ext and not t.aliases:
return True
- if f.extfunc:
- e = f.extfunc
- if e.category==ext or e.category in secondary:
+
+ # Core things promoted from the extension are also relevant
+ if t.source:
+ e = t.source
+ if e.extension==target_ext or e.extension in secondary:
return True
+
return False
-funcs = [f for f in funcs.itervalues() if is_relevant(f)]
+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))
-for f in funcs:
- if not ver:
- ver = f.version
+for t in itertools.chain(funcs, enums):
+ if not core_version:
+ core_version = t.version
- if f.category and not f.name.endswith(exttype):
- bp_ext = f.category
+ # Things in backport extensions don't acquire an extension suffix
+ if t.extension and not t.name.endswith(ext_type):
+ backport_ext = t.extension
- if f.extfunc:
- f.typedef = "PFN%sPROC"%f.extfunc.name.upper()
+for f in funcs:
+ if f.source:
+ # Typedefs for early core functions are not available in all
+ # implementations
+ f.typedef = "PFN%sPROC"%f.source.name.upper()
else:
f.typedef = "PFN%sPROC"%f.name.upper()
-if ver:
- ver = map(int, ver.split('.'))
+### Output ###
out = file(out_base+".h", "w")
-out.write("#ifndef MSP_GL_%s_\n"%ext.upper())
-out.write("#define MSP_GL_%s_\n"%ext.upper())
+out.write("#ifndef MSP_GL_%s_\n"%target_ext.upper())
+out.write("#define MSP_GL_%s_\n"%target_ext.upper())
out.write("""
#include <msp/gl/extension.h>
namespace Msp {
namespace GL {
+
""")
-if funcs:
- out.write("\n")
-for f in funcs:
- out.write("extern %s %s;\n"%(f.typedef, f.name))
+if funcs or enums:
+ if funcs:
+ out.write("#if defined(__APPLE__) || !defined(GL_%s)\n"%target_ext)
+ for f in funcs:
+ out.write("typedef %s (*%s)(%s);\n"%(f.return_type, f.typedef, ", ".join(f.params)))
+ out.write("#endif\n\n")
-out.write("\nextern Extension %s;\n"%ext)
+ if enums:
+ if core_version:
+ out.write("#ifndef GL_VERSION_%s\n"%"_".join(map(str, core_version)))
+ else:
+ out.write("#ifndef GL_%s\n"%target_ext)
+ for e in enums:
+ out.write("#define %s 0x%04X\n"%(e.name, e.value))
+ out.write("#endif\n\n")
+
+ for f in funcs:
+ out.write("extern %s %s;\n"%(f.typedef, f.name))
+
+out.write("extern Extension %s;\n"%target_ext)
out.write("""
} // namespace GL
""")
out = file(out_base+".cpp", "w")
-out.write("#include \"%s.h\"\n"%ext.lower())
+out.write("#include \"%s.h\"\n"%target_ext.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 {
+
""")
-if funcs:
- out.write("\n")
for f in funcs:
out.write("%s %s = 0;\n"%(f.typedef, f.name))
-out.write("\nExtension::SupportLevel init_%s()\n{\n"%ext.lower())
-if ver:
- out.write("\tif(is_version_at_least(%d, %d)"%tuple(ver))
- if bp_ext:
- out.write(" || is_supported(\"GL_%s\")"%bp_ext)
+out.write("\nExtension::SupportLevel init_%s()\n{\n"%target_ext.lower())
+out.write("#ifdef GL_%s\n"%target_ext)
+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)
out.write(")\n\t{\n")
- for f in funcs:
- out.write("\t\t%s = reinterpret_cast<%s>(get_proc_address(\"%s\"));\n"%(f.name, f.typedef, f.name))
+ if funcs:
+ for f in funcs:
+ 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 ext!=bp_ext:
- out.write("\tif(is_supported(\"GL_%s\"))\n\t{\n"%(ext))
- for f in funcs:
- n = f.name
- if f.extfunc:
- n = f.extfunc.name
- out.write("\t\t%s = reinterpret_cast<%s>(get_proc_address(\"%s\"));\n"%(f.name, f.typedef, n))
+if target_ext!=backport_ext:
+ out.write("\tif(is_supported(\"GL_%s\"))\n\t{\n"%(target_ext))
+ if funcs:
+ for f in funcs:
+ n = f.name
+ if f.source:
+ n = f.source.name
+ out.write("\t\t%s = reinterpret_cast<%s>(GET_PROC_ADDRESS(%s));\n"%(f.name, f.typedef, n))
out.write("\t\treturn Extension::EXTENSION;\n")
out.write("\t}\n")
+out.write("#endif\n")
out.write("\treturn Extension::UNSUPPORTED;\n")
out.write("}\n")
-out.write("\nExtension %s(\"GL_%s\", init_%s);\n"%(ext, ext, ext.lower()))
+out.write("\nExtension %s(\"GL_%s\", init_%s);\n"%(target_ext, target_ext, target_ext.lower()))
out.write("""
} // namespace GL
projects / libs / gl.git / blobdiff