feat(gx): add incomplete 'CGxDeviceGLSDL' (#2)

* chore(build): add vendored SDL 3.0.0 library

* chore(build): add vendored glew-cmake-2.2.0 library

* feat(console): in the presence of -opengl launch flag, change GxApi to OpenGl

* feat(gx): add uncompleted CGxDeviceGLSDL targeting Windows and Linux

* chore(build): change SDL3 linkage from shared (bad) to to static (good)

vendor/glew-cmake-2.2.0/auto/bin/parse_xml.py

@@ -0,0 +1,145 @@
+#!/usr/bin/env python
+
+import re
+import sys
+from xml.dom.minidom import parse, Node
+
+#
+# DOM traversal utility functions
+#
+
+def findChildren(node, path):
+    result = []
+    if len(path)==1:
+        for i in node.childNodes:
+            if i.nodeType==Node.ELEMENT_NODE:
+                if i.tagName==path[0]:
+                    result.append(i)
+    else:
+        for i in node.childNodes:
+            if i.nodeType==Node.ELEMENT_NODE:
+                if i.tagName==path[0]:
+                    result.extend(findChildren(i, path[1:]))
+    return result
+
+def findData(node, path):
+    return [ i.firstChild.data for i in findChildren(node, path) ]
+
+isPointer = re.compile('(.*)([ ]+)([*]+)')
+
+def findParams(node):
+    n = findData(node, ['name'])[0]
+    t = ''
+    for i in node.childNodes:
+        if i.nodeType==Node.TEXT_NODE:
+            t += i.data
+        if i.nodeType==Node.ELEMENT_NODE and i.tagName=='ptype':
+            t += i.firstChild.data
+
+    t.strip()
+    m = isPointer.match(t)
+    if m:
+        t = ('%s%s'%(m.group(1), m.group(3))).strip()
+    return ( t, n.strip())
+
+def findEnums(dom):
+    return {i.getAttribute('name'): i.getAttribute('value') for i in findChildren(dom, [ 'registry', 'enums', 'enum' ])}
+
+def findCommands(dom):
+    ret = {}
+    for i in findChildren(dom, [ 'registry', 'commands', 'command' ]):
+      r,n = findParams(findChildren(i, ['proto'])[0])
+      p = [ findParams(j) for j in findChildren(i, ['param'])]
+      ret[n] = (r, p)
+    return ret
+
+def findFeatures(dom):
+    ret = {}
+    for i in findChildren(dom, [ 'registry', 'feature' ]):
+        n = i.getAttribute('name')
+        e = [j.getAttribute("name") for j in findChildren(i, [ 'require', 'enum' ])]
+        c = [j.getAttribute("name") for j in findChildren(i, [ 'require', 'command' ])]
+        ret[n] = (e,c)
+    return ret
+
+def findExtensions(dom):
+    ret = {}
+    for i in findChildren(dom, [ 'registry', 'extensions', 'extension' ]):
+        n = i.getAttribute('name')
+        e = [j.getAttribute("name") for j in findChildren(i, [ 'require', 'enum' ])]
+        c = [j.getAttribute("name") for j in findChildren(i, [ 'require', 'command' ])]
+        ret[n] = (e,c)
+    return ret
+
+def findApi(dom, name):
+    enums      = findEnums(dom)
+    commands   = findCommands(dom)
+    features   = findFeatures(dom)
+    extensions = findExtensions(dom)
+    return (enums, commands, features, extensions)
+
+#
+#
+#
+
+isWGL = re.compile('WGL_([A-Z0-9]+)_.*')
+
+def writeExtension(f, name, extension, enums, commands):
+    f.write(('%s\n'%name).encode())
+
+    url = 'https://www.khronos.org/registry/egl/specs/eglspec.1.5.pdf'
+
+    m = isWGL.match(name)
+    if m:
+        url = 'https://www.khronos.org/registry/OpenGL/extensions/%s/%s.txt'%(m.group(1), name)
+
+    f.write(('%s\n'%(url)).encode())
+
+    if name.find('_VERSION_')==-1:
+        f.write(('%s\n'%name).encode())
+    else:
+        f.write('\n'.encode())
+    f.write('\n'.encode())
+
+    enums = [ (j, enums[j]) for j in extension[0] ]
+    for e in sorted(enums, key=lambda i: i[1]):
+        f.write(('\t%s %s\n'%(e[0], e[1])).encode())
+
+    commands = [ (j, commands[j]) for j in extension[1] ]
+    for c in sorted(commands):
+        params = ', '.join( [ '%s %s'%(j[0].strip(), j[1].strip()) for j in c[1][1] ] )
+        if len(params)==0:
+            params = 'void'
+        f.write(('\t%s %s (%s)\n'%(c[1][0].strip(), c[0].strip(), params)).encode())
+
+if __name__ == '__main__':
+
+  from argparse import ArgumentParser
+  import os
+
+  parser = ArgumentParser(description='usage: %prog [options] [XML specs...]')
+  parser.add_argument("--core", dest="core", help="location for core outputs", default='')
+  parser.add_argument("--api", dest="name", help="API name: egl, wgl, glx, etc", default='')
+  parser.add_argument("--extensions", dest="extensions", help="location for extensions outputs", default='')
+
+  (options, args) = parser.parse_known_args()
+  options = vars(options)
+
+  for i in args:
+
+    dom = parse(i)
+    api = findApi(dom, options['name'])
+
+    print('Found {} enums, {} commands, {} features and {} extensions.'.format(
+        len(api[0]), len(api[1]), len(api[2]), len(api[3])))
+
+    if len(options['core']):
+        for i in api[2].keys():
+            with open(os.path.join(options['core'], i), 'wb') as f:
+                writeExtension(f, i, api[2][i], api[0], api[1])
+
+    if len(options['extensions']):
+        for i in api[3].keys():
+            with open(os.path.join(options['extensions'], i), 'wb') as f:
+                writeExtension(f, i, api[3][i], api[0], api[1])
+