Implement KHR ICD extension

This adds a pointer to the dispatch table at the beginning of every object
of type

 - cl_command_queue
 - cl_context
 - cl_device_id
 - cl_event
 - cl_kernel
 - cl_mem
 - cl_platform_id
 - cl_program
 - cl_sampler

as required by the ICD specification. The layout of the dispatch table
comes from the OpenCL ICD loader by Brice Videau <brice.videau@imag.fr> and
Vincent Danjean <Vincent.Danjean@ens-lyon.org>.

To avoid dispatch table entries being overwritten with the ICD loader's
implementations of the CL functions (as would be the proper behaviour for
the ELF loader), the -Bsymbolic option is given to the linker.

Signed-off-by: Zhigang Gong <zhigang.gong@linux.intel.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/src/cl_extensions.c b/src/cl_extensions.c
index 7d1031fb..052b5897 100644
--- a/src/cl_extensions.c
+++ b/src/cl_extensions.c
@@ -31,6 +31,14 @@ void check_basic_extension(cl_extensions_t *extensions)
       extensions->extensions[id].base.ext_enabled = 1;
 }
 
+void check_opt1_extension(cl_extensions_t *extensions)
+{
+  int id;
+  for(id = OPT1_EXT_START_ID; id <= OPT1_EXT_END_ID; id++)
+    if (id == EXT_ID(khr_icd))
+      extensions->extensions[id].base.ext_enabled = 1;
+}
+
 void
 check_gl_extension(cl_extensions_t *extensions) {
 #ifdef HAS_EGL
@@ -101,6 +109,7 @@ cl_intel_platform_extension_init(cl_platform_id intel_platform)
     return;
   }
   check_basic_extension(&intel_extensions);
+  check_opt1_extension(&intel_extensions);
   check_gl_extension(&intel_extensions);
   check_intel_extension(&intel_extensions);
   process_extension_str(&intel_extensions);