1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
/**
* @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_
|
