Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/opensubdiv-source/examples/common/shaderCache.h

@@ -0,0 +1,53 @@
+//
+//   Copyright 2015 Pixar
+//
+//   Licensed under the terms set forth in the LICENSE.txt file available at
+//   https://opensubdiv.org/license.
+//
+
+#ifndef OPENSUBDIV_EXAMPLES_SHADER_CACHE_H
+#define OPENSUBDIV_EXAMPLES_SHADER_CACHE_H
+
+#include <map>
+
+template <typename DESC_TYPE, typename CONFIG_TYPE>
+class ShaderCacheT {
+public:
+    typedef DESC_TYPE DescType;
+    typedef CONFIG_TYPE ConfigType;
+    typedef std::map<DescType, ConfigType *> ConfigMap;
+
+    virtual ~ShaderCacheT() {
+        Reset();
+    }
+
+    void Reset() {
+        for (typename ConfigMap::iterator it = _configMap.begin();
+             it != _configMap.end(); ++it) {
+            delete it->second;
+        }
+        _configMap.clear();
+    }
+
+    // fetch shader config
+    ConfigType * GetDrawConfig(DescType const & desc) {
+        typename ConfigMap::iterator it = _configMap.find(desc);
+        if (it != _configMap.end()) {
+            return it->second;
+        } else {
+            ConfigType * config = CreateDrawConfig(desc);
+            if (config) {
+                _configMap[desc] = config;
+            }
+            return config;
+        }
+    }
+
+    virtual ConfigType *CreateDrawConfig(DescType const &desc) = 0;
+
+private:
+    ConfigMap _configMap;
+};
+
+
+#endif  // OPENSUBDIV_EXAMPLES_SHADER_CACHE_H