From 85fcd51ea3092fc206f0d6406a1f647a034d1faf Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Tue, 21 Nov 2017 06:07:41 +0530
Subject: [PATCH] Enable building of glfw-wayland backend

---
 .gitignore            |  1 +
 glfw/glfw.py          | 27 +++++++++++++++++++++++++--
 glfw/source-info.json |  4 ++++
 glfw/wl_init.c        |  2 +-
 setup.py              | 13 +++++++++++--
 5 files changed, 42 insertions(+), 5 deletions(-)

diff --git a/.gitignore b/.gitignore
index 178fc5778..2d0817a91 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,4 @@ asan-launcher
 kitty-profile
 dev
 __pycache__
+glfw/wayland-*-client-protocol.h
diff --git a/glfw/glfw.py b/glfw/glfw.py
index d99626643..8ca8c33cb 100755
--- a/glfw/glfw.py
+++ b/glfw/glfw.py
@@ -33,9 +33,10 @@ def init_env(env, pkg_config, at_least_version, module='x11'):
         )
     else:
         ans.ldpaths.extend('-lrt -lm -ldl'.split())
+    sinfo = json.load(open(os.path.join(base, 'source-info.json')))
 
     if module == 'x11':
-        for dep in 'x11 xrandr xinerama xcursor xkbcommon-x11'.split():
+        for dep in 'x11 xrandr xinerama xcursor xkbcommon xkbcommon-x11'.split():
             ans.cflags.extend(pkg_config(dep, '--cflags-only-I'))
             ans.ldpaths.extend(pkg_config(dep, '--libs'))
 
@@ -43,12 +44,30 @@ def init_env(env, pkg_config, at_least_version, module='x11'):
         for f in 'Cocoa IOKit CoreFoundation CoreVideo'.split():
             ans.ldpaths.extend(('-framework', f))
 
-    sinfo = json.load(open(os.path.join(base, 'source-info.json')))
+    elif module == 'wayland':
+        at_least_version('wayland-protocols', 1, 1)
+        ans.wayland_packagedir = os.path.abspath(pkg_config('wayland-protocols', '--variable=pkgdatadir')[0])
+        ans.wayland_scanner = os.path.abspath(pkg_config('wayland-scanner', '--variable=wayland_scanner')[0])
+        ans.wayland_protocols = tuple(sinfo[module]['protocols'])
+        for dep in 'wayland-egl wayland-client wayland-scanner xkbcommon'.split():
+            ans.cflags.extend(pkg_config(dep, '--cflags-only-I'))
+            ans.ldpaths.extend(pkg_config(dep, '--libs'))
+
     ans.sources = sinfo['common']['sources'] + sinfo[module]['sources']
     ans.all_headers = [x for x in os.listdir(base) if x.endswith('.h')]
     return ans
 
 
+def build_wayland_protocols(env, run_tool, emphasis, newer, dest_dir):
+    for protocol in env.wayland_protocols:
+        src = os.path.join(env.wayland_packagedir, protocol)
+        dest = os.path.basename(src).rpartition('.')[0] + '-client-protocol.h'
+        dest = os.path.join(dest_dir, 'wayland-' + dest)
+        if newer(dest, src):
+            run_tool([env.wayland_scanner, 'client-header', src, dest],
+                     desc='Generating {} ...'.format(emphasis(os.path.basename(dest))))
+
+
 def collect_source_information():
     raw = open('src/CMakeLists.txt').read()
 
@@ -71,6 +90,10 @@ def collect_source_information():
         if group == 'x11':
             ans[group]['headers'].append('linux_joystick.h')
             ans[group]['sources'].append('linux_joystick.c')
+        elif group == 'wayland':
+            ans[group]['protocols'] = p = []
+            for m in re.finditer(r'WAYLAND_PROTOCOLS_PKGDATADIR\}/([^"]+)"', raw):
+                p.append(m.group(1))
     return ans
 
 
diff --git a/glfw/source-info.json b/glfw/source-info.json
index 7c6803764..78f2fcf52 100644
--- a/glfw/source-info.json
+++ b/glfw/source-info.json
@@ -62,6 +62,10 @@
       "egl_context.h", 
       "osmesa_context.h"
     ], 
+    "protocols": [
+      "unstable/relative-pointer/relative-pointer-unstable-v1.xml", 
+      "unstable/pointer-constraints/pointer-constraints-unstable-v1.xml"
+    ], 
     "sources": [
       "wl_init.c", 
       "wl_monitor.c", 
diff --git a/glfw/wl_init.c b/glfw/wl_init.c
index 3841636f2..6e7003d1b 100644
--- a/glfw/wl_init.c
+++ b/glfw/wl_init.c
@@ -131,7 +131,7 @@ static void pointerHandleAxis(void* data,
 {
     _GLFWwindow* window = _glfw.wl.pointerFocus;
     double scrollFactor;
-    double x, y;
+    double x = 0.0, y = 0.0;
 
     if (!window)
         return;
diff --git a/setup.py b/setup.py
index f299795fe..a78dfe461 100755
--- a/setup.py
+++ b/setup.py
@@ -384,11 +384,20 @@ def find_c_files():
 
 
 def compile_glfw(incremental, compilation_database, all_keys):
-    modules = 'cocoa' if isosx else 'x11'
+    modules = 'cocoa' if isosx else 'x11 wayland'
     for module in modules.split():
-        genv = glfw.init_env(env, pkg_config, at_least_version, module)
+        try:
+            genv = glfw.init_env(env, pkg_config, at_least_version, module)
+        except SystemExit as err:
+            if module != 'wayland':
+                raise
+            print(err.message, file=sys.stderr)
+            print('Disabling building of wayland backend', file=sys.stderr)
+            continue
         sources = [os.path.join('glfw', x) for x in genv.sources]
         all_headers = [os.path.join('glfw', x) for x in genv.all_headers]
+        if module == 'wayland':
+            glfw.build_wayland_protocols(genv, run_tool, emphasis, newer, os.path.join(base, 'glfw'))
         compile_c_extension(genv, 'kitty/glfw-' + module, incremental, compilation_database, all_keys, sources, all_headers)