GPU: ShaderCreateInfo: Add convenience ResourceString

This will improve readability of shader resource generation
code.

source/blender/gpu/intern/gpu_shader_create_info.hh

@@ -718,6 +718,36 @@ struct ShaderCreateInfo {
 
   GeneratedSourceList generated_sources;
 
+  /* Same as StringRefNull but with a few extra member functions. */
+  struct ResourceString : public StringRefNull {
+    constexpr ResourceString() : StringRefNull() {}
+    constexpr ResourceString(const char *str, int64_t size) : StringRefNull(str, size) {}
+    ResourceString(std::nullptr_t) = delete;
+    constexpr ResourceString(const char *str) : StringRefNull(str) {}
+    ResourceString(const std::string &str) : StringRefNull(str) {}
+    ResourceString(const StringRefNull &str) : StringRefNull(str) {}
+
+    int64_t array_offset() const
+    {
+      return this->find_first_of("[");
+    }
+
+    bool is_array() const
+    {
+      return array_offset() != -1;
+    }
+
+    StringRef str_no_array() const
+    {
+      return StringRef(this->c_str(), this->array_offset());
+    }
+
+    StringRef str_only_array() const
+    {
+      return this->substr(this->array_offset());
+    }
+  };
+
 #  define TEST_EQUAL(a, b, _member) \
     if (!((a)._member == (b)._member)) { \
       return false; \
@@ -822,7 +852,7 @@ struct ShaderCreateInfo {
 
   struct SharedVariable {
     Type type;
-    StringRefNull name;
+    ResourceString name;
   };
 
   Vector<SharedVariable, 0> shared_variables_;
@@ -842,13 +872,13 @@ struct ShaderCreateInfo {
 
   struct UniformBuf {
     StringRefNull type_name;
-    StringRefNull name;
+    ResourceString name;
   };
 
   struct StorageBuf {
     Qualifier qualifiers;
     StringRefNull type_name;
-    StringRefNull name;
+    ResourceString name;
   };
 
   struct Resource {
@@ -937,7 +967,7 @@ struct ShaderCreateInfo {
 
   struct PushConst {
     Type type;
-    StringRefNull name;
+    ResourceString name;
     int array_size;
 
     bool operator==(const PushConst &b) const