summaryrefslogtreecommitdiff
path: root/common/glfw_view.cpp
blob: 5c623d72597b9aea9b3c3e57928e3362a50cc83e (plain)
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
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
#include "glfw_view.hpp"

GLFWView::GLFWView(bool fullscreen) : fullscreen(fullscreen) {}

GLFWView::~GLFWView() { glfwTerminate(); }

void GLFWView::initialize(llmr::Map *map) {
    View::initialize(map);

    if (!glfwInit()) {
        fprintf(stderr, "Failed to initialize glfw\n");
        exit(1);
    }

    GLFWmonitor *monitor = nullptr;
    if (fullscreen) {
        monitor = glfwGetPrimaryMonitor();
    }

#ifdef GL_ES_VERSION_2_0
    glfwWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_ES_API);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
#endif

    glfwWindowHint(GLFW_RED_BITS, 8);
    glfwWindowHint(GLFW_GREEN_BITS, 8);
    glfwWindowHint(GLFW_BLUE_BITS, 8);
    glfwWindowHint(GLFW_ALPHA_BITS, 8);
    glfwWindowHint(GLFW_STENCIL_BITS, 8);
    glfwWindowHint(GLFW_DEPTH_BITS, 16);

    window = glfwCreateWindow(1024, 768, "llmr", monitor, NULL);
    if (!window) {
        glfwTerminate();
        fprintf(stderr, "Failed to initialize window\n");
        exit(1);
    }

    glfwSetWindowUserPointer(window, this);
    glfwMakeContextCurrent(window);

    int width, height;
    glfwGetWindowSize(window, &width, &height);
    int fb_width, fb_height;
    glfwGetFramebufferSize(window, &fb_width, &fb_height);

    resize(window, 0, 0);

    glfwSetCursorPosCallback(window, mousemove);
    glfwSetMouseButtonCallback(window, mouseclick);
    glfwSetWindowSizeCallback(window, resize);
    glfwSetFramebufferSizeCallback(window, resize);
    glfwSetScrollCallback(window, scroll);
    glfwSetKeyCallback(window, key);

    glfwMakeContextCurrent(nullptr);
}

void GLFWView::key(GLFWwindow *window, int key, int /*scancode*/, int action, int mods) {
    GLFWView *view = (GLFWView *)glfwGetWindowUserPointer(window);

    if (action == GLFW_RELEASE) {
        switch (key) {
        case GLFW_KEY_ESCAPE:
            glfwSetWindowShouldClose(window, true);
            break;
        case GLFW_KEY_TAB:
            view->map->toggleDebug();
            break;
        case GLFW_KEY_X:
            if (!mods)
                view->map->resetPosition();
            break;
        case GLFW_KEY_R:
            if (!mods)
                view->map->toggleStyle();
            break;
        case GLFW_KEY_N:
            if (!mods)
                view->map->resetNorth();
            break;
        }
    }
}

void GLFWView::scroll(GLFWwindow *window, double /*xoffset*/, double yoffset) {
    GLFWView *view = (GLFWView *)glfwGetWindowUserPointer(window);
    double delta = yoffset * 40;

    bool is_wheel = delta != 0 && std::fmod(delta, 4.000244140625) == 0;

    double absdelta = delta < 0 ? -delta : delta;
    double scale = 2.0 / (1.0 + std::exp(-absdelta / 100.0));

    // Make the scroll wheel a bit slower.
    if (!is_wheel) {
        scale = (scale - 1.0) / 2.0 + 1.0;
    }

    // Zooming out.
    if (delta < 0 && scale != 0) {
        scale = 1.0 / scale;
    }

    view->map->startScaling();
    view->map->scaleBy(scale, view->last_x, view->last_y);
}

void GLFWView::resize(GLFWwindow *window, int, int) {
    GLFWView *view = (GLFWView *)glfwGetWindowUserPointer(window);

    int width, height;
    glfwGetWindowSize(window, &width, &height);
    int fb_width, fb_height;
    glfwGetFramebufferSize(window, &fb_width, &fb_height);

    view->map->resize(width, height, (float)fb_width / (float)width, fb_width, fb_height);
}

void GLFWView::mouseclick(GLFWwindow *window, int button, int action, int modifiers) {
    GLFWView *view = (GLFWView *)glfwGetWindowUserPointer(window);

    if (button == GLFW_MOUSE_BUTTON_RIGHT ||
        (button == GLFW_MOUSE_BUTTON_LEFT && modifiers & GLFW_MOD_CONTROL)) {
        view->rotating = action == GLFW_PRESS;
        if (!view->rotating) {
            view->map->stopRotating();
        }
    } else if (button == GLFW_MOUSE_BUTTON_LEFT) {
        view->tracking = action == GLFW_PRESS;

        if (action == GLFW_RELEASE) {
            view->map->stopPanning();
            double now = glfwGetTime();
            if (now - view->last_click < 0.4 /* ms */) {
                if (modifiers & GLFW_MOD_SHIFT) {
                    view->map->scaleBy(0.5, view->last_x, view->last_y, 0.5);
                } else {
                    view->map->scaleBy(2.0, view->last_x, view->last_y, 0.5);
                }
            }
            view->last_click = now;
        }
    }
}

void GLFWView::mousemove(GLFWwindow *window, double x, double y) {
    GLFWView *view = (GLFWView *)glfwGetWindowUserPointer(window);
    if (view->tracking) {
        double dx = x - view->last_x;
        double dy = y - view->last_y;
        if (dx || dy) {
            view->map->startPanning();
            view->map->moveBy(dx, dy);
        }
    } else if (view->rotating) {
        view->map->startRotating();
        view->map->rotateBy(view->last_x, view->last_y, x, y);
    }
    view->last_x = x;
    view->last_y = y;
}

int GLFWView::run() {
    map->start();

    while (!glfwWindowShouldClose(window)) {
        if (map->needsSwap()) {
            glfwSwapBuffers(window);
            map->swapped();
            fps();
        }

        glfwWaitEvents();
    }

    map->stop();

    return 0;
}

void GLFWView::make_active() {
    glfwMakeContextCurrent(window);
}

void GLFWView::swap() {
    glfwPostEmptyEvent();
}

void GLFWView::fps() {
    static int frames = 0;
    static double time_elapsed = 0;

    frames++;
    double current_time = glfwGetTime();

    if (current_time - time_elapsed >= 1) {
        fprintf(stderr, "FPS: %4.2f\n", frames / (current_time - time_elapsed));
        time_elapsed = current_time;
        frames = 0;
    }
}

namespace llmr {
namespace platform {

double elapsed() { return glfwGetTime(); }

void show_debug_image(std::string name, const char *data, size_t width, size_t height) {
    glfwInit();

    static GLFWwindow *debug_window = nullptr;
    if (!debug_window) {
        debug_window = glfwCreateWindow(width, height, name.c_str(), nullptr, nullptr);
        if (!debug_window) {
            glfwTerminate();
            fprintf(stderr, "Failed to initialize window\n");
            exit(1);
        }
    }

    GLFWwindow *current_window = glfwGetCurrentContext();

    glfwSetWindowSize(debug_window, width, height);
    glfwMakeContextCurrent(debug_window);

    int fb_width, fb_height;
    glfwGetFramebufferSize(debug_window, &fb_width, &fb_height);
    float scale = (float)fb_width / (float)width;

    glPixelZoom(scale, -scale);
    glRasterPos2f(-1.0f, 1.0f);
    glDrawPixels(width, height, GL_LUMINANCE, GL_UNSIGNED_BYTE, data);
    glfwSwapBuffers(debug_window);

    glfwMakeContextCurrent(current_window);
}


void show_color_debug_image(std::string name, const char *data, size_t logical_width, size_t logical_height, size_t width, size_t height) {
    glfwInit();

    static GLFWwindow *debug_window = nullptr;
    if (!debug_window) {
        debug_window = glfwCreateWindow(logical_width, logical_height, name.c_str(), nullptr, nullptr);
        if (!debug_window) {
            glfwTerminate();
            fprintf(stderr, "Failed to initialize window\n");
            exit(1);
        }
    }

    GLFWwindow *current_window = glfwGetCurrentContext();

    glfwSetWindowSize(debug_window, logical_width, logical_height);
    glfwMakeContextCurrent(debug_window);

    int fb_width, fb_height;
    glfwGetFramebufferSize(debug_window, &fb_width, &fb_height);
    float x_scale = (float)fb_width / (float)width;
    float y_scale = (float)fb_height / (float)height;

    glClear(GL_COLOR_BUFFER_BIT);
    glEnable(GL_BLEND);
    glBlendFunc(GL_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

    glPixelZoom(x_scale, -y_scale);
    glRasterPos2f(-1.0f, 1.0f);
    glDrawPixels(width, height, GL_RGBA, GL_UNSIGNED_INT_8_8_8_8_REV, data);
    glfwSwapBuffers(debug_window);

    glfwMakeContextCurrent(current_window);
}

void notify_map_change() {
    // no-op
}

}
}