Merge pull request #16 from google/pp-directive

Preprocessing directive handling

Test/baseResults/preprocessor.line.frag.err

@@ -0,0 +1,2 @@
+Warning, version 310 is not yet complete; most version-specific features are present, but some are missing.
+

Test/baseResults/preprocessor.line.frag.out

@@ -0,0 +1,5 @@
+#version 310 es
+#line 1 2
+#pragma something
+void main(){ }
+

Test/baseResults/preprocessor.line.vert.out

@@ -1,24 +1,39 @@
-#line 300
-
-#line 2
-
-#line 10
-
-#line 2
-
-#line 0
-
-#line 4
-
-#line 8
-
-void main(){
-  gl_Position = vec4(10);
-}
-#line 8 4
-
-#line 12 3
-
-#line 1
-
-
+#line 300
+
+#line 2
+
+
+
+
+
+#line 10
+
+
+#line 2
+
+#line 0
+
+
+
+#line 4
+
+
+
+
+
+#line 8
+
+void main(){
+  gl_Position = vec4(10);
+}
+
+#line 8 4
+
+
+
+
+#line 12 3
+
+#line 1
+
+