1 files changed, 39 insertions, 0 deletions

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+#ifndef INPUT_H_0FB34C42
+#define INPUT_H_0FB34C42
+
+#include <SDL.h>
+#include <vector>
+
+/**
+ * Helper class that detects when a key is newly pressed.
+ */
+class Input {
+public:
+
+  Input()
+  {
+    const Uint8* s = SDL_GetKeyboardState(&length_);
+
+    curstate_.assign(s, s + length_);
+    prevstate_ = curstate_;
+  }
+
+  void tick(const Uint8* keystate)
+  {
+    prevstate_ = std::move(curstate_);
+    curstate_.assign(keystate, keystate + length_);
+  }
+
+  bool wasPressed(int scancode) const
+  {
+    return curstate_.at(scancode) && !prevstate_.at(scancode);
+  }
+
+private:
+
+  int length_;
+  std::vector<Uint8> curstate_;
+  std::vector<Uint8> prevstate_;
+};
+
+#endif /* end of include guard: INPUT_H_0FB34C42 */