glapi: Fix OpenGL and OpenGL ES interop.

When --enable-shared-glapi is specified, libGL will share libglapi with
OpenGL ES instead of defining its own copy of glapi.  This makes sure an
app will get only one copy of glapi in its address space.

The new option is disabled by default.  When enabled, libGL and libglapi
must be built from the same source tree and distributed together.  This
requirement comes from the fact that the dispatch offsets used by these
libraries are re-assigned whenever GLAPI XMLs are changed.

For GLX, indirect rendering for has_different_protocol() functions is
tricky.  A has_different_protocol() function is assigned only one
dispatch offset, yet each entry point needs a different protocol opcode.
It cannot be supported by the shared glapi.  The fix to this is to make
glXGetProcAddress handle such functions specially before calling
_glapi_get_proc_address.

Note that these files are automatically generated/re-generated

 src/glx/indirect.c
 src/glx/indirect.h
 src/mapi/glapi/glapi_mapi_tmp.h

1 files changed, 6 insertions, 1 deletions

diff --git a/src/glx/glxcmds.c b/src/glx/glxcmds.c
index 4f7e84ef5f..d12ff9684e 100644
--- a/src/glx/glxcmds.c
+++ b/src/glx/glxcmds.c
@@ -36,6 +36,7 @@
 #include "glxclient.h"
 #include "glapi.h"
 #include "glxextensions.h"
+#include "indirect.h"
 
 #ifdef GLX_DIRECT_RENDERING
 #ifdef GLX_USE_APPLEGL
@@ -2514,7 +2515,11 @@ _X_EXPORT void (*glXGetProcAddressARB(const GLubyte * procName)) (void)
    f = (gl_function) get_glx_proc_address((const char *) procName);
    if ((f == NULL) && (procName[0] == 'g') && (procName[1] == 'l')
        && (procName[2] != 'X')) {
-      f = (gl_function) _glapi_get_proc_address((const char *) procName);
+#ifdef GLX_SHARED_GLAPI
+      f = (gl_function) __indirect_get_proc_address((const char *) procName);
+#endif
+      if (!f)
+         f = (gl_function) _glapi_get_proc_address((const char *) procName);
    }
 #endif
    return f;