Switch to using glad instead of glew

glad/generate.py

@@ -0,0 +1,62 @@
+#!/usr/bin/env python3
+# vim:fileencoding=utf-8
+# License: GPL v3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
+
+import os
+import re
+import shlex
+import shutil
+import subprocess
+
+cmdline = (
+    'glad --profile core --out-path {dest} --api gl=3.3 --generator {generator} --spec gl'
+    ' --extensions GL_ARB_texture_storage,GL_ARB_copy_image,GL_ARB_multisample,GL_ARB_robustness,GL_KHR_debug'
+)
+
+
+def clean(x):
+    if os.path.exists(x):
+        shutil.rmtree(x)
+
+
+def regenerate():
+    clean('out')
+
+    subprocess.check_call(
+        shlex.split(cmdline.format(dest='out', generator='c-debug'))
+    )
+
+
+def export():
+    c = open('out/src/glad.c', 'rb').read().decode('utf-8')
+    functions = []
+
+    def sub(m):
+        functions.append(m.group(2))
+        return m.group()
+
+    c = re.sub(r'^([A-Z0-9]+) glad_debug_([a-zA-Z0-9]+) = glad_debug_impl_\2;$', sub, c, flags=re.M)
+    switch = ['glad_debug_{0} = glad_{0}'.format(f) for f in functions]
+    c = c.replace('<glad/glad.h>', '"gl-wrapper.h"', 1)
+    c = '#pragma GCC diagnostic ignored "-Wpedantic"\n' + c
+    c += '''
+int
+init_glad(GLADloadproc load, int debug) {
+    int ret = gladLoadGLLoader(load);
+    if (ret && !debug) {
+        SUB;
+    }
+    return ret;
+}'''.replace('SUB', ';\n        '.join(switch), 1)
+    open('../kitty/gl-wrapper.c', 'w').write(c)
+    raw = open('out/include/glad/glad.h').read()
+    raw = raw.replace('<KHR/khrplatform.h>', '"khrplatform.h"')
+    raw += '\nint init_glad(GLADloadproc, int);'
+    open('../kitty/gl-wrapper.h', 'w').write(raw)
+    shutil.copy2('out/include/KHR/khrplatform.h', '../kitty')
+
+
+if __name__ == '__main__':
+    os.chdir(os.path.dirname(os.path.abspath(__file__)))
+    regenerate()
+    export()