EGL: Implement the libglvnd interface for EGL (v3)

The new interface mostly just sits on top of the existing library.

The only change to the existing EGL code is to split the client
extension string into platform extensions and everything else. On
non-glvnd builds, eglQueryString will just concatenate the two strings.

The EGL dispatch stubs are all generated. The script is based on the one
used to generate entrypoints in libglvnd itself.

v2: [Kyle]
 - Rebased against master.
 - Reworked the EGL makefile to use separate libraries
 - Made the EGL code generation scripts work with Python 2 and 3.
 - Change gen_egl_dispatch.py to use argparse for the command line arguments.
 - Assorted formatting and style cleanup in the Python scripts.

v3: [Emil Velikov]
 - Rebase
 - Remove separate glvnd glx/egl configure toggles

Signed-off-by: Emil Velikov <[email protected]>

1 files changed, 12 insertions, 1 deletions

diff --git a/src/egl/main/eglglobals.h b/src/egl/main/eglglobals.h
index ec4f3d04a36..c6ef59d4820 100644
--- a/src/egl/main/eglglobals.h
+++ b/src/egl/main/eglglobals.h
@@ -57,7 +57,15 @@ struct _egl_global
    EGLint NumAtExitCalls;
    void (*AtExitCalls[10])(void);
 
-   const char *ClientExtensionString;
+   /*
+    * Under libglvnd, the client extension string has to be split into two
+    * strings, one for platform extensions, and one for everything else. So,
+    * define separate strings for them. _eglGetClientExtensionString will
+    * concatenate them together for a non-libglvnd build.
+    */
+   const char *ClientOnlyExtensionString;
+   const char *PlatformExtensionString;
+   char *ClientExtensionString;
 
    EGLDEBUGPROCKHR debugCallback;
    unsigned int debugTypesEnabled;
@@ -76,4 +84,7 @@ static inline unsigned int DebugBitFromType(EGLenum type)
    return (1 << (type - EGL_DEBUG_MSG_CRITICAL_KHR));
 }
 
+extern const char *
+_eglGetClientExtensionString(void);
+
 #endif /* EGLGLOBALS_INCLUDED */