1 files changed, 95 insertions, 0 deletions
diff --git a/src/window.hpp b/src/window.hpp
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+++ b/src/window.hpp
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+/**
+ * @file window.hpp
+ * Manages window creation.
+ *
+ * Copyright (C) 2019 Clyne Sullivan
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef WINDOW_HPP_
+#define WINDOW_HPP_
+
+#include <entityx/entityx.h>
+#include <SDL2/SDL.h>
+
+/**
+ * @class WindowSystem
+ * Handles the game's window.
+ */
+class WindowSystem : public entityx::System<WindowSystem> {
+private:
+	constexpr static const char *title = "gamedev2";
+	constexpr static int width = 640;
+	constexpr static int height = 480;
+
+	std::unique_ptr<SDL_Window, void (*)(SDL_Window *)> window;
+	SDL_GLContext context;
+
+public:
+	WindowSystem(void) :
+		window(nullptr, SDL_DestroyWindow) {}
+
+	~WindowSystem(void) {
+		SDL_GL_DeleteContext(context);
+	}
+
+	/**
+	 * Creates and initializes the window.
+	 * @return Zero on success, non-zero on error
+	 */
+	int init(void) {
+		if (SDL_InitSubSystem(SDL_INIT_VIDEO) != 0) {
+			std::cerr << "SDL video failed to initialize: "
+				<< SDL_GetError() << std::endl;
+			return -1;
+		}
+
+		// Create window, managed by the unique_ptr
+		window.reset(SDL_CreateWindow(title,
+			SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
+			width, height,
+			SDL_WINDOW_OPENGL));
+
+		if (window.get() == nullptr) {
+			std::cerr << "SDL window creation failed: "
+				<< SDL_GetError() << std::endl;
+			return -1;
+		}
+
+		context = SDL_GL_CreateContext(window.get());
+
+		return 0;
+	}
+
+	/**
+	 * Prepares the system for running.
+	 */
+	void configure([[maybe_unused]] entityx::EntityManager& entities,
+		[[maybe_unused]] entityx::EventManager& events) final {
+		init();
+	}
+
+	/**
+	 * Updates/refreshes the window.
+	 */
+	void update([[maybe_unused]] entityx::EntityManager& entities,
+		[[maybe_unused]] entityx::EventManager& events,
+		[[maybe_unused]] entityx::TimeDelta dt) final {
+		SDL_GL_SwapWindow(window.get());
+	}
+};
+
+#endif // WINDOW_HPP_
+