[core] add gfx::Renderable and gfx::OffscreenTexture

1 files changed, 44 insertions, 0 deletions

diff --git a/include/mbgl/gfx/renderable.hpp b/include/mbgl/gfx/renderable.hpp
new file mode 100644
index 0000000000..3a973e6693
--- /dev/null
+++ b/include/mbgl/gfx/renderable.hpp
@@ -0,0 +1,44 @@
+#pragma once
+
+#include <mbgl/util/size.hpp>
+
+#include <memory>
+#include <cassert>
+
+namespace mbgl {
+namespace gfx {
+
+class RenderableResource {
+protected:
+    explicit RenderableResource() = default;
+
+public:
+    virtual ~RenderableResource() = default;
+    RenderableResource(const RenderableResource&) = delete;
+    RenderableResource& operator=(const RenderableResource&) = delete;
+};
+
+class Renderable {
+protected:
+    Renderable(const Size size_, std::unique_ptr<RenderableResource> resource_)
+        : size(size_), resource(std::move(resource_)) {
+    }
+
+public:
+    Size getSize() const {
+        return size;
+    }
+
+    template <typename T>
+    T& getResource() const {
+        assert(resource);
+        return static_cast<T&>(*resource);
+    }
+
+protected:
+    Size size;
+    std::unique_ptr<RenderableResource> resource;
+};
+
+} // namespace gfx
+} // namespace mbgl