rendertests: switch gl_VertexID to gl_VertexIndex
diff --git a/tests/vktestframework.cpp b/tests/vktestframework.cpp
index 5ea9d1e..ec2c41d 100644
--- a/tests/vktestframework.cpp
+++ b/tests/vktestframework.cpp
@@ -1859,6 +1859,7 @@
 
     EShMessages messages = EShMsgDefault;
     SetMessageOptions(messages);
+    messages = static_cast<EShMessages>(messages | EShMsgSpvRules | EShMsgVulkanRules);
 
     EShLanguage stage = FindLanguage(shader_type);
     glslang::TShader* shader = new glslang::TShader(stage);