Opt in to gl_in/gl_out handling rather than other way around.

spirv_glsl.cpp

@@ -370,6 +370,7 @@ string CompilerGLSL::compile()
 
 	if (options.vulkan_semantics)
 		backend.allow_precision_qualifiers = true;
+	backend.force_gl_in_out_block = true;
 
 	// Scan the SPIR-V to find trivial uses of extensions.
 	find_static_extensions();
@@ -4318,8 +4319,8 @@ string CompilerGLSL::access_chain_internal(uint32_t base, const uint32_t *indice
 				{
 				case BuiltInPosition:
 				case BuiltInPointSize:
-				case BuiltInCullDistance:
-				case BuiltInClipDistance:
+				//case BuiltInCullDistance: // These are already arrays, need to figure out rules for these in tess/geom.
+				//case BuiltInClipDistance:
 					if (var->storage == StorageClassInput)
 						expr = join("gl_in[", to_expression(index), "].", expr);
 					else if (var->storage == StorageClassOutput)

spirv_glsl.hpp

@@ -322,7 +322,7 @@ protected:
 		bool allow_precision_qualifiers = false;
 		bool can_swizzle_scalar = false;
 		bool force_temp_use_for_two_vector_shuffles = false;
-		bool force_gl_in_out_block = true;
+		bool force_gl_in_out_block = false;
 	} backend;
 
 	void emit_struct(SPIRType &type);

spirv_msl.cpp

@@ -71,7 +71,6 @@ string CompilerMSL::compile()
 	backend.native_row_major_matrix = false;
 	backend.flexible_member_array_supported = false;
 	backend.force_temp_use_for_two_vector_shuffles = true;
-	backend.force_gl_in_out_block = false;
 
 	replace_illegal_names();