Add generic texture component for renderables

include/openspace/rendering/texturecomponent.h

@@ -0,0 +1,70 @@
+/*****************************************************************************************
+ *                                                                                       *
+ * OpenSpace                                                                             *
+ *                                                                                       *
+ * Copyright (c) 2014-2021                                                               *
+ *                                                                                       *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this  *
+ * software and associated documentation files (the "Software"), to deal in the Software *
+ * without restriction, including without limitation the rights to use, copy, modify,    *
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to    *
+ * permit persons to whom the Software is furnished to do so, subject to the following   *
+ * conditions:                                                                           *
+ *                                                                                       *
+ * The above copyright notice and this permission notice shall be included in all copies *
+ * or substantial portions of the Software.                                              *
+ *                                                                                       *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,   *
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A         *
+ * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT    *
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF  *
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+ * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                                         *
+ ****************************************************************************************/
+
+#ifndef __OPENSPACE_CORE___TEXTURECOMPONENT___H__
+#define __OPENSPACE_CORE___TEXTURECOMPONENT___H__
+
+#include <ghoul/opengl/ghoul_gl.h>
+#include <ghoul/opengl/texture.h>
+#include <optional>
+
+namespace ghoul::filesystem { class File; }
+namespace ghoul::opengl {class Texture; }
+
+namespace openspace {
+
+class TextureComponent {
+    using Texture = ghoul::opengl::Texture;
+
+public:
+    TextureComponent() = default;
+    TextureComponent(const Texture::FilterMode filterMode, bool watchFile = true);
+    ~TextureComponent() = default;
+
+    Texture* texture() const;
+
+    void bind();
+    void uploadToGpu();
+
+    // Loads a texture from a file on disk
+    void loadFromFile(const std::string& path);
+
+    // Function to call in a renderable's update function to make sure
+    // the texture is kept up to date
+    void update();
+
+private:
+    std::unique_ptr<ghoul::filesystem::File> _textureFile = nullptr;
+    std::unique_ptr<Texture> _texture = nullptr;
+
+    Texture::FilterMode _filterMode = Texture::FilterMode::LinearMipMap;
+    bool _shouldWatchFile = true;
+
+    bool _fileIsDirty = false;
+    bool _textureIsDirty = false;
+};
+
+} // namespace openspace
+
+#endif // __OPENSPACE_CORE___TEXTURECOMPONENT___H__