Allow drivers to alter the default driver name on rsdHalInit

Bug: 20894432

Permit partner drivers via Context::setDriverName to choose their
own mDriverName rather than the default OVERRIDE_RS_DRIVER string.

This can only be done once from within rsdHalInit otherwise it will
be ignored and the default behaviour will apply.

Change-Id: I49b81e60f7983a81f0e71fbef4b46f9bfc834849
(cherry picked from commit b268abd5528936d13a85b03f44458fe3a55cafad)

2 files changed, 9 insertions, 1 deletions

diff --git a/rsContext.h b/rsContext.h
index 918e5e3f..09b7483f 100644
--- a/rsContext.h
+++ b/rsContext.h
@@ -290,6 +290,14 @@ public:
         return mDriverName;
     }
 
+    // Set a new driver name, should be called from within
+    // rsdHalInit in order to alter default behaviour.
+    void setDriverName(const char * name) {
+        if (!mDriverName) {
+            mDriverName = name;
+        }
+    }
+
 
 protected:
 
diff --git a/rsDriverLoader.cpp b/rsDriverLoader.cpp
index 5bfb8e5c..7b728b62 100644
--- a/rsDriverLoader.cpp
+++ b/rsDriverLoader.cpp
@@ -207,7 +207,7 @@ bool Context::loadRuntime(const char* filename) {
     }
 
     // Only map in the actual driver name if we successfully load the runtime.
-    mDriverName = filename;
+    setDriverName(filename);
 
     return true;