add APIs for semaphores, external semaphores, and external memory (#4)

Author: bashbaug

scripts/call_all.c.mako

@@ -25,6 +25,7 @@ defaultValueForType = {
     'cl_platform_id'                    : 'NULL',
     'cl_program'                        : 'NULL',
     'cl_sampler'                        : 'NULL',
+    'cl_semaphore_khr'                  : 'NULL',
     'CLeglDisplayKHR'                   : 'NULL',
     'CLeglImageKHR'                     : 'NULL',
     'CLeglSyncKHR'                      : 'NULL',
@@ -45,6 +46,7 @@ defaultValueForType = {
     'cl_dx9_device_set_intel'           : 'CL_ALL_DEVICES_FOR_DX9_INTEL',
     'cl_dx9_media_adapter_set_khr'      : 'CL_ALL_DEVICES_FOR_DX9_MEDIA_ADAPTER_KHR',
     'cl_dx9_media_adapter_type_khr'     : 'CL_ADAPTER_D3D9_KHR',
+    'cl_external_semaphore_handle_type_khr' : '0',
     'cl_image_pitch_info_qcom'          : 'CL_IMAGE_ROW_ALIGNMENT_QCOM',
     'cl_kernel_exec_info_arm'           : 'CL_KERNEL_EXEC_INFO_SVM_PTRS_ARM',
     'cl_kernel_sub_group_info'          : 'CL_KERNEL_MAX_SUB_GROUP_SIZE_FOR_NDRANGE_KHR',
@@ -56,6 +58,7 @@ defaultValueForType = {
     'cl_mem_migration_flags_ext'        : 'CL_MIGRATE_MEM_OBJECT_HOST_EXT',
     'cl_mem_object_type'                : 'CL_MEM_OBJECT_IMAGE2D',
     'cl_mipmap_filter_mode_img'         : 'CL_MIPMAP_FILTER_ANY_IMG',
+    'cl_semaphore_info_khr'             : 'CL_SEMAPHORE_CONTEXT_KHR',
     'cl_svm_mem_flags_arm'              : 'CL_MEM_SVM_FINE_GRAIN_BUFFER_ARM',
     'cl_va_api_device_source_intel'     : 'CL_VA_API_DISPLAY_INTEL',
     'cl_va_api_device_set_intel'        : 'CL_ALL_DEVICES_FOR_VA_API_INTEL',

scripts/openclext.cpp.mako

@@ -262,6 +262,24 @@ static inline cl_platform_id _get_platform(cl_mem memobj)
     return _get_platform(context);
 }
 
+#if defined(cl_khr_semaphore)
+
+static inline cl_platform_id _get_platform(cl_semaphore_khr semaphore)
+{
+    if (semaphore == NULL) return NULL;
+
+    cl_context context = NULL;
+    clGetSemaphoreInfoKHR(
+        semaphore,
+        CL_SEMAPHORE_CONTEXT_KHR,
+        sizeof(context),
+        &context,
+        NULL);
+    return _get_platform(context);
+}
+
+#endif // defined(cl_khr_semaphore)
+
 #if defined(cl_intel_accelerator)
 
 static inline cl_platform_id _get_platform(cl_accelerator_intel accelerator)