From 5e4b94c1bbf530db49b56915154f4d9fabd09bec Mon Sep 17 00:00:00 2001
From: Julien Isorce <julien.isorce@gmail.com>
Date: Mon, 6 Jul 2015 00:52:06 +0100
Subject: [PATCH] gl: support cgl, egl and glx within a same build

On osx, with the same build,
gst-launch-1.0 videotestsrc ! glimagesink works with:

GST_GL_PLATFORM=egl GST_GL_WINDOW=x11 GST_GL_API=gles2
GST_GL_PLATFORM=egl GST_GL_WINDOW=x11 GST_GL_API=opengl

GST_GL_PLATFORM=glx GST_GL_WINDOW=x11 GST_GL_API=opengl

GST_GL_PLATFORM=cgl GST_GL_WINDOW=cocoa GST_GL_API=opengl
GST_GL_PLATFORM=cgl GST_GL_WINDOW=cocoa GST_GL_API=opengl3

https://bugzilla.gnome.org/show_bug.cgi?id=752743
---
 configure.ac                           | 32 ++++++++++++++++++--------
 gst-libs/gst/gl/egl/gstglcontext_egl.c | 30 +++++++++++++++++++++++-
 gst-libs/gst/gl/gstglapi.h             |  2 +-
 3 files changed, 52 insertions(+), 12 deletions(-)

diff --git a/configure.ac b/configure.ac
index 00c7f0728a..1e1ad87de4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -805,14 +805,14 @@ if test "x$HAVE_GL" = "xyes" -a "x$HAVE_GLES2" = "xyes"; then
 #ifndef GL_GLEXT_PROTOTYPES
 #define GL_GLEXT_PROTOTYPES 1
 #endif
-# ifdef __APPLE__
+# ifdef HAVE_IOS
 #  include <OpenGLES/ES2/gl.h>
 #  include <OpenGLES/ES2/glext.h>
 # else
 #  include <GLES2/gl2.h>
 #  include <GLES2/gl2ext.h>
 # endif
-# if __APPLE__
+# ifdef __APPLE__
 #  include <OpenGL/OpenGL.h>
 #  include <OpenGL/gl.h>
 #  if MAC_OS_X_VERSION_MAX_ALLOWED >= 1070
@@ -999,12 +999,6 @@ case $host in
       if test "x$NEED_WGL" = "xyes"; then
         AC_MSG_ERROR([WGL is not available on Mac OS X])
       fi
-      if test "x$NEED_EGL" = "xyes"; then
-        AC_MSG_ERROR([EGL is not available on Mac OS X])
-      fi
-      if test "x$NEED_GLES2" = "xyes"; then
-        AC_MSG_ERROR([OpenGL|ES 2.0 is not supported on your platform yet])
-      fi
 
       if test "x$NEED_COCOA" != "xno"; then
         GL_LIBS="$LIBS -framework OpenGL -framework Cocoa -framework QuartzCore -framework CoreFoundation"
@@ -1030,6 +1024,24 @@ case $host in
           USE_OPENGL=yes
         fi
       fi
+
+      if test "x$HAVE_EGL" = "xyes"; then
+        if test "x$NEED_EGL" != "xno"; then
+          if test "x$HAVE_WINDOW_X11" = "xyes"; then
+            GL_LIBS="$GL_LIBS -lEGL $EGL_LIBS"
+            GL_CFLAGS="$GL_CFLAGS $EGL_CFLAGS"
+            USE_EGL=yes
+          fi
+        fi
+      fi
+
+      dnl OpenGL|ES 2.0
+      if test "x$HAVE_GLES2" = "xyes"; then
+        if test "x$NEED_GLES2" != "xno"; then
+          GL_LIBS="$GL_LIBS -lGLESv2"
+          USE_GLES2=yes
+        fi
+      fi
     fi
     ;;
   *-mingw32*)
@@ -1237,7 +1249,7 @@ if test "x$USE_GLES2" = "xyes"; then
 #ifndef GL_GLEXT_PROTOTYPES
 #define GL_GLEXT_PROTOTYPES 1
 #endif
-# ifdef __APPLE__
+# ifdef HAVE_IOS
 #  include <OpenGLES/ES2/gl.h>
 #  include <OpenGLES/ES2/glext.h>
 # else
@@ -1249,7 +1261,7 @@ fi
 
 if test "x$USE_OPENGL" = "xyes"; then
   GL_INCLUDES="$GL_INCLUDES
-# if __APPLE__
+# ifdef __APPLE__
 #  include <OpenGL/OpenGL.h>
 #  include <OpenGL/gl.h>
 # else
diff --git a/gst-libs/gst/gl/egl/gstglcontext_egl.c b/gst-libs/gst/gl/egl/gstglcontext_egl.c
index 74ddc7354c..c466a0a68d 100644
--- a/gst-libs/gst/gl/egl/gstglcontext_egl.c
+++ b/gst-libs/gst/gl/egl/gstglcontext_egl.c
@@ -627,7 +627,35 @@ gst_gl_context_egl_get_proc_address (GstGLAPI gl_api, const gchar * name)
   gpointer result = NULL;
   static GOnce g_once = G_ONCE_INIT;
 
-  result = gst_gl_context_default_get_proc_address (gl_api, name);
+#ifdef __APPLE__
+#if GST_GL_HAVE_OPENGL && !defined(GST_GL_LIBGL_MODULE_NAME)
+  if (!result && (gl_api & (GST_GL_API_OPENGL | GST_GL_API_OPENGL3))) {
+    static GModule *module_opengl = NULL;
+    if (g_once_init_enter (&module_opengl)) {
+      GModule *setup_module_opengl =
+          g_module_open ("libGL.dylib", G_MODULE_BIND_LAZY);
+      g_once_init_leave (&module_opengl, setup_module_opengl);
+    }
+    if (module_opengl)
+      g_module_symbol (module_opengl, name, &result);
+  }
+#endif
+#if GST_GL_HAVE_GLES2 && !defined(GST_GL_LIBGLESV2_MODULE_NAME)
+  if (!result && (gl_api & (GST_GL_API_GLES2))) {
+    static GModule *module_gles2 = NULL;
+    if (g_once_init_enter (&module_gles2)) {
+      GModule *setup_module_gles2 =
+          g_module_open ("libGLESv2.dylib", G_MODULE_BIND_LAZY);
+      g_once_init_leave (&module_gles2, setup_module_gles2);
+    }
+    if (module_gles2)
+      g_module_symbol (module_gles2, name, &result);
+  }
+#endif
+#endif // __APPLE__
+
+  if (!result)
+    result = gst_gl_context_default_get_proc_address (gl_api, name);
 
   g_once (&g_once, load_egl_module, NULL);
 
diff --git a/gst-libs/gst/gl/gstglapi.h b/gst-libs/gst/gl/gstglapi.h
index 5f162c4603..5ef1c6550d 100644
--- a/gst-libs/gst/gl/gstglapi.h
+++ b/gst-libs/gst/gl/gstglapi.h
@@ -28,7 +28,7 @@
 #ifndef GL_GLEXT_PROTOTYPES
 #define GL_GLEXT_PROTOTYPES 1
 #endif
-# ifdef __APPLE__
+# ifdef HAVE_IOS
 #  include <OpenGLES/ES2/gl.h>
 #  include <OpenGLES/ES2/glext.h>
 # else