1 files changed, 176 insertions, 0 deletions
diff --git a/gfx/gl/GLConsts.py b/gfx/gl/GLConsts.py
new file mode 100755
index 0000000000..90aceb9eb0
--- /dev/null
+++ b/gfx/gl/GLConsts.py
@@ -0,0 +1,176 @@
+#!/usr/bin/env python3
+
+"""
+This script will regenerate and update GLConsts.h.
+
+Step 1:
+  Download the last gl.xml, egl.xml, glx.xml and wgl.xml from
+  http://www.opengl.org/registry/#specfiles into some XML_DIR:
+    wget https://www.khronos.org/registry/OpenGL/xml/gl.xml
+    wget https://www.khronos.org/registry/OpenGL/xml/glx.xml
+    wget https://www.khronos.org/registry/OpenGL/xml/wgl.xml
+    wget https://www.khronos.org/registry/EGL/api/egl.xml
+
+Step 2:
+  `py ./GLConsts.py <XML_DIR>`
+
+Step 3:
+  Do not add the downloaded XML in the patch
+
+Step 4:
+  Enjoy =)
+"""
+
+# includes
+from typing import List  # mypy!
+
+import pathlib
+import sys
+import xml.etree.ElementTree
+
+# -
+
+(_, XML_DIR_STR) = sys.argv
+XML_DIR = pathlib.Path(XML_DIR_STR)
+
+# -
+
+HEADER = b"""
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// clang-format off
+
+#ifndef GLCONSTS_H_
+#define GLCONSTS_H_
+
+/**
+ * GENERATED FILE, DO NOT MODIFY DIRECTLY.
+ * This is a file generated directly from the official OpenGL registry
+ * xml available http://www.opengl.org/registry/#specfiles.
+ *
+ * To generate this file, see tutorial in \'GLParseRegistryXML.py\'.
+ */
+"""[
+    1:
+]
+
+FOOTER = b"""
+#endif // GLCONSTS_H_
+
+// clang-format on
+"""[
+    1:
+]
+
+# -
+
+
+def format_lib_constant(lib, name, value):
+    # lib would be 'GL', 'EGL', 'GLX' or 'WGL'
+    # name is the name of the const (example: MAX_TEXTURE_SIZE)
+    # value is the value of the const (example: 0xABCD)
+
+    define = "#define LOCAL_" + lib + "_" + name
+    whitespace = 60 - len(define)
+    if whitespace < 0:
+        whitespace = whitespace % 8
+
+    return define + " " * whitespace + " " + value
+
+
+class GLConst:
+    def __init__(self, lib, name, value, type):
+        self.lib = lib
+        self.name = name
+        self.value = value
+        self.type = type
+
+
+class GLDatabase:
+    LIBS = ["GL", "EGL", "GLX", "WGL"]
+
+    def __init__(self):
+        self.consts = {}
+        self.libs = set(GLDatabase.LIBS)
+        self.vendors = set(["EXT", "ATI"])
+        # there is no vendor="EXT" and vendor="ATI" in gl.xml,
+        # so we manualy declare them
+
+    def load_xml(self, xml_path):
+        tree = xml.etree.ElementTree.parse(xml_path)
+        root = tree.getroot()
+
+        for enums in root.iter("enums"):
+            vendor = enums.get("vendor")
+            if not vendor:
+                # there some standart enums that do have the vendor attribute,
+                # so we fake them as ARB's enums
+                vendor = "ARB"
+
+            if vendor not in self.vendors:
+                # we map this new vendor in the vendors set.
+                self.vendors.add(vendor)
+
+            namespaceType = enums.get("type")
+
+            for enum in enums:
+                if enum.tag != "enum":
+                    # this is not an enum => we skip it
+                    continue
+
+                lib = enum.get("name").split("_")[0]
+
+                if lib not in self.libs:
+                    # unknown library => we skip it
+                    continue
+
+                name = enum.get("name")[len(lib) + 1 :]
+                value = enum.get("value")
+                type = enum.get("type")
+
+                if not type:
+                    # if no type specified, we get the namespace's default type
+                    type = namespaceType
+
+                self.consts[lib + "_" + name] = GLConst(lib, name, value, type)
+
+
+# -
+
+db = GLDatabase()
+db.load_xml(XML_DIR / "gl.xml")
+db.load_xml(XML_DIR / "glx.xml")
+db.load_xml(XML_DIR / "wgl.xml")
+db.load_xml(XML_DIR / "egl.xml")
+
+# -
+
+lines: List[str] = []  # noqa: E999 (bug 1573737)
+
+keys = sorted(db.consts.keys())
+
+for lib in db.LIBS:
+    lines.append("// " + lib)
+
+    for k in keys:
+        const = db.consts[k]
+
+        if const.lib != lib:
+            continue
+
+        const_str = format_lib_constant(lib, const.name, const.value)
+        lines.append(const_str)
+
+    lines.append("")
+
+# -
+
+b_lines: List[bytes] = [HEADER] + [x.encode() for x in lines] + [FOOTER]
+b_data: bytes = b"\n".join(b_lines)
+
+dest = pathlib.Path("GLConsts.h")
+dest.write_bytes(b_data)
+
+print(f"Wrote {len(b_data)} bytes.")  # Some indication that we're successful.