Partial implementation of atomic counters.

git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@27701 e7fa87d3-cd2b-0410-9028-fcbf551c1848

Test/atomic_uint.frag

@@ -0,0 +1,20 @@
+#version 420 core
+
+layout(binding = 0) uniform atomic_uint counter;
+
+uint func(atomic_uint c)
+{
+    return atomicCounterIncrement(c);
+}
+
+uint func2(out atomic_uint c) // ERROR
+{
+    return counter;
+}
+
+void main()
+{
+     atomic_uint non_uniform_counter; // ERROR
+     uint val = atomicCounter(counter);
+     atomicCounterDecrement(counter);
+}