1 //========================================================================
2 // Cursor & input mode tests
3 // Copyright (c) Camilla Löwy <elmindreda@glfw.org>
4 //
5 // This software is provided 'as-is', without any express or implied
6 // warranty. In no event will the authors be held liable for any damages
7 // arising from the use of this software.
8 //
9 // Permission is granted to anyone to use this software for any purpose,
10 // including commercial applications, and to alter it and redistribute it
11 // freely, subject to the following restrictions:
12 //
13 // 1. The origin of this software must not be misrepresented; you must not
14 // claim that you wrote the original software. If you use this software
15 // in a product, an acknowledgment in the product documentation would
16 // be appreciated but is not required.
17 //
18 // 2. Altered source versions must be plainly marked as such, and must not
19 // be misrepresented as being the original software.
20 //
21 // 3. This notice may not be removed or altered from any source
22 // distribution.
23 //
24 //========================================================================
25 //
26 // This test provides an interface to the cursor image and cursor mode
27 // parts of the API.
28 //
29 // Custom cursor image generation by urraka.
30 //
31 //========================================================================
32
33 #define GLAD_GL_IMPLEMENTATION
34 #include <glad/gl.h>
35 #define GLFW_INCLUDE_NONE
36 #include <GLFW/glfw3.h>
37
38 #if defined(_MSC_VER)
39 // Make MS math.h define M_PI
40 #define _USE_MATH_DEFINES
41 #endif
42
43 #include <math.h>
44 #include <stdio.h>
45 #include <stdlib.h>
46
47 #include "linmath.h"
48
49 #define CURSOR_FRAME_COUNT 60
50
51 static const char* vertex_shader_text =
52 "#version 110\n"
53 "uniform mat4 MVP;\n"
54 "attribute vec2 vPos;\n"
55 "void main()\n"
56 "{\n"
57 " gl_Position = MVP * vec4(vPos, 0.0, 1.0);\n"
58 "}\n";
59
60 static const char* fragment_shader_text =
61 "#version 110\n"
62 "void main()\n"
63 "{\n"
64 " gl_FragColor = vec4(1.0);\n"
65 "}\n";
66
67 static double cursor_x;
68 static double cursor_y;
69 static int swap_interval = 1;
70 static int wait_events = GLFW_TRUE;
71 static int animate_cursor = GLFW_FALSE;
72 static int track_cursor = GLFW_FALSE;
73 static GLFWcursor* standard_cursors[10];
74 static GLFWcursor* tracking_cursor = NULL;
75
error_callback(int error,const char * description)76 static void error_callback(int error, const char* description)
77 {
78 fprintf(stderr, "Error: %s\n", description);
79 }
80
star(int x,int y,float t)81 static float star(int x, int y, float t)
82 {
83 const float c = 64 / 2.f;
84
85 const float i = (0.25f * (float) sin(2.f * M_PI * t) + 0.75f);
86 const float k = 64 * 0.046875f * i;
87
88 const float dist = (float) sqrt((x - c) * (x - c) + (y - c) * (y - c));
89
90 const float salpha = 1.f - dist / c;
91 const float xalpha = (float) x == c ? c : k / (float) fabs(x - c);
92 const float yalpha = (float) y == c ? c : k / (float) fabs(y - c);
93
94 return (float) fmax(0.f, fmin(1.f, i * salpha * 0.2f + salpha * xalpha * yalpha));
95 }
96
create_cursor_frame(float t)97 static GLFWcursor* create_cursor_frame(float t)
98 {
99 int i = 0, x, y;
100 unsigned char buffer[64 * 64 * 4];
101 const GLFWimage image = { 64, 64, buffer };
102
103 for (y = 0; y < image.width; y++)
104 {
105 for (x = 0; x < image.height; x++)
106 {
107 buffer[i++] = 255;
108 buffer[i++] = 255;
109 buffer[i++] = 255;
110 buffer[i++] = (unsigned char) (255 * star(x, y, t));
111 }
112 }
113
114 return glfwCreateCursor(&image, image.width / 2, image.height / 2);
115 }
116
create_tracking_cursor(void)117 static GLFWcursor* create_tracking_cursor(void)
118 {
119 int i = 0, x, y;
120 unsigned char buffer[32 * 32 * 4];
121 const GLFWimage image = { 32, 32, buffer };
122
123 for (y = 0; y < image.width; y++)
124 {
125 for (x = 0; x < image.height; x++)
126 {
127 if (x == 7 || y == 7)
128 {
129 buffer[i++] = 255;
130 buffer[i++] = 0;
131 buffer[i++] = 0;
132 buffer[i++] = 255;
133 }
134 else
135 {
136 buffer[i++] = 0;
137 buffer[i++] = 0;
138 buffer[i++] = 0;
139 buffer[i++] = 0;
140 }
141 }
142 }
143
144 return glfwCreateCursor(&image, 7, 7);
145 }
146
cursor_position_callback(GLFWwindow * window,double x,double y)147 static void cursor_position_callback(GLFWwindow* window, double x, double y)
148 {
149 printf("%0.3f: Cursor position: %f %f (%+f %+f)\n",
150 glfwGetTime(),
151 x, y, x - cursor_x, y - cursor_y);
152
153 cursor_x = x;
154 cursor_y = y;
155 }
156
key_callback(GLFWwindow * window,int key,int scancode,int action,int mods)157 static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
158 {
159 if (action != GLFW_PRESS)
160 return;
161
162 switch (key)
163 {
164 case GLFW_KEY_A:
165 {
166 animate_cursor = !animate_cursor;
167 if (!animate_cursor)
168 glfwSetCursor(window, NULL);
169
170 break;
171 }
172
173 case GLFW_KEY_ESCAPE:
174 {
175 const int mode = glfwGetInputMode(window, GLFW_CURSOR);
176 if (mode != GLFW_CURSOR_DISABLED && mode != GLFW_CURSOR_CAPTURED)
177 {
178 glfwSetWindowShouldClose(window, GLFW_TRUE);
179 break;
180 }
181
182 /* FALLTHROUGH */
183 }
184
185 case GLFW_KEY_N:
186 glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
187 glfwGetCursorPos(window, &cursor_x, &cursor_y);
188 printf("(( cursor is normal ))\n");
189 break;
190
191 case GLFW_KEY_D:
192 glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
193 printf("(( cursor is disabled ))\n");
194 break;
195
196 case GLFW_KEY_H:
197 glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_HIDDEN);
198 printf("(( cursor is hidden ))\n");
199 break;
200
201 case GLFW_KEY_C:
202 glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_CAPTURED);
203 printf("(( cursor is captured ))\n");
204 break;
205
206 case GLFW_KEY_R:
207 if (!glfwRawMouseMotionSupported())
208 break;
209
210 if (glfwGetInputMode(window, GLFW_RAW_MOUSE_MOTION))
211 {
212 glfwSetInputMode(window, GLFW_RAW_MOUSE_MOTION, GLFW_FALSE);
213 printf("(( raw input is disabled ))\n");
214 }
215 else
216 {
217 glfwSetInputMode(window, GLFW_RAW_MOUSE_MOTION, GLFW_TRUE);
218 printf("(( raw input is enabled ))\n");
219 }
220 break;
221
222 case GLFW_KEY_SPACE:
223 swap_interval = 1 - swap_interval;
224 printf("(( swap interval: %i ))\n", swap_interval);
225 glfwSwapInterval(swap_interval);
226 break;
227
228 case GLFW_KEY_W:
229 wait_events = !wait_events;
230 printf("(( %sing for events ))\n", wait_events ? "wait" : "poll");
231 break;
232
233 case GLFW_KEY_T:
234 track_cursor = !track_cursor;
235 if (track_cursor)
236 glfwSetCursor(window, tracking_cursor);
237 else
238 glfwSetCursor(window, NULL);
239
240 break;
241
242 case GLFW_KEY_P:
243 {
244 double x, y;
245 glfwGetCursorPos(window, &x, &y);
246
247 printf("Query before set: %f %f (%+f %+f)\n",
248 x, y, x - cursor_x, y - cursor_y);
249 cursor_x = x;
250 cursor_y = y;
251
252 glfwSetCursorPos(window, cursor_x, cursor_y);
253 glfwGetCursorPos(window, &x, &y);
254
255 printf("Query after set: %f %f (%+f %+f)\n",
256 x, y, x - cursor_x, y - cursor_y);
257 cursor_x = x;
258 cursor_y = y;
259 break;
260 }
261
262 case GLFW_KEY_UP:
263 glfwSetCursorPos(window, 0, 0);
264 glfwGetCursorPos(window, &cursor_x, &cursor_y);
265 break;
266
267 case GLFW_KEY_DOWN:
268 {
269 int width, height;
270 glfwGetWindowSize(window, &width, &height);
271 glfwSetCursorPos(window, width - 1, height - 1);
272 glfwGetCursorPos(window, &cursor_x, &cursor_y);
273 break;
274 }
275
276 case GLFW_KEY_0:
277 glfwSetCursor(window, NULL);
278 break;
279
280 case GLFW_KEY_1:
281 case GLFW_KEY_2:
282 case GLFW_KEY_3:
283 case GLFW_KEY_4:
284 case GLFW_KEY_5:
285 case GLFW_KEY_6:
286 case GLFW_KEY_7:
287 case GLFW_KEY_8:
288 case GLFW_KEY_9:
289 {
290 int index = key - GLFW_KEY_1;
291 if (mods & GLFW_MOD_SHIFT)
292 index += 9;
293
294 if (index < sizeof(standard_cursors) / sizeof(standard_cursors[0]))
295 glfwSetCursor(window, standard_cursors[index]);
296
297 break;
298 }
299
300 case GLFW_KEY_F11:
301 case GLFW_KEY_ENTER:
302 {
303 static int x, y, width, height;
304
305 if (mods != GLFW_MOD_ALT)
306 return;
307
308 if (glfwGetWindowMonitor(window))
309 glfwSetWindowMonitor(window, NULL, x, y, width, height, 0);
310 else
311 {
312 GLFWmonitor* monitor = glfwGetPrimaryMonitor();
313 const GLFWvidmode* mode = glfwGetVideoMode(monitor);
314 glfwGetWindowPos(window, &x, &y);
315 glfwGetWindowSize(window, &width, &height);
316 glfwSetWindowMonitor(window, monitor,
317 0, 0, mode->width, mode->height,
318 mode->refreshRate);
319 }
320
321 glfwGetCursorPos(window, &cursor_x, &cursor_y);
322 break;
323 }
324 }
325 }
326
main(void)327 int main(void)
328 {
329 int i;
330 GLFWwindow* window;
331 GLFWcursor* star_cursors[CURSOR_FRAME_COUNT];
332 GLFWcursor* current_frame = NULL;
333 GLuint vertex_buffer, vertex_shader, fragment_shader, program;
334 GLint mvp_location, vpos_location;
335
336 glfwSetErrorCallback(error_callback);
337
338 if (!glfwInit())
339 exit(EXIT_FAILURE);
340
341 tracking_cursor = create_tracking_cursor();
342 if (!tracking_cursor)
343 {
344 glfwTerminate();
345 exit(EXIT_FAILURE);
346 }
347
348 for (i = 0; i < CURSOR_FRAME_COUNT; i++)
349 {
350 star_cursors[i] = create_cursor_frame(i / (float) CURSOR_FRAME_COUNT);
351 if (!star_cursors[i])
352 {
353 glfwTerminate();
354 exit(EXIT_FAILURE);
355 }
356 }
357
358 for (i = 0; i < sizeof(standard_cursors) / sizeof(standard_cursors[0]); i++)
359 {
360 const int shapes[] = {
361 GLFW_ARROW_CURSOR,
362 GLFW_IBEAM_CURSOR,
363 GLFW_CROSSHAIR_CURSOR,
364 GLFW_POINTING_HAND_CURSOR,
365 GLFW_RESIZE_EW_CURSOR,
366 GLFW_RESIZE_NS_CURSOR,
367 GLFW_RESIZE_NWSE_CURSOR,
368 GLFW_RESIZE_NESW_CURSOR,
369 GLFW_RESIZE_ALL_CURSOR,
370 GLFW_NOT_ALLOWED_CURSOR
371 };
372
373 standard_cursors[i] = glfwCreateStandardCursor(shapes[i]);
374 }
375
376 glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
377 glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
378
379 window = glfwCreateWindow(640, 480, "Cursor Test", NULL, NULL);
380 if (!window)
381 {
382 glfwTerminate();
383 exit(EXIT_FAILURE);
384 }
385
386 glfwMakeContextCurrent(window);
387 gladLoadGL(glfwGetProcAddress);
388
389 glGenBuffers(1, &vertex_buffer);
390 glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);
391
392 vertex_shader = glCreateShader(GL_VERTEX_SHADER);
393 glShaderSource(vertex_shader, 1, &vertex_shader_text, NULL);
394 glCompileShader(vertex_shader);
395
396 fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
397 glShaderSource(fragment_shader, 1, &fragment_shader_text, NULL);
398 glCompileShader(fragment_shader);
399
400 program = glCreateProgram();
401 glAttachShader(program, vertex_shader);
402 glAttachShader(program, fragment_shader);
403 glLinkProgram(program);
404
405 mvp_location = glGetUniformLocation(program, "MVP");
406 vpos_location = glGetAttribLocation(program, "vPos");
407
408 glEnableVertexAttribArray(vpos_location);
409 glVertexAttribPointer(vpos_location, 2, GL_FLOAT, GL_FALSE,
410 sizeof(vec2), (void*) 0);
411 glUseProgram(program);
412
413 glfwGetCursorPos(window, &cursor_x, &cursor_y);
414 printf("Cursor position: %f %f\n", cursor_x, cursor_y);
415
416 glfwSetCursorPosCallback(window, cursor_position_callback);
417 glfwSetKeyCallback(window, key_callback);
418
419 while (!glfwWindowShouldClose(window))
420 {
421 glClear(GL_COLOR_BUFFER_BIT);
422
423 if (track_cursor)
424 {
425 int wnd_width, wnd_height, fb_width, fb_height;
426 float scale;
427 vec2 vertices[4];
428 mat4x4 mvp;
429
430 glfwGetWindowSize(window, &wnd_width, &wnd_height);
431 glfwGetFramebufferSize(window, &fb_width, &fb_height);
432
433 glViewport(0, 0, fb_width, fb_height);
434
435 scale = (float) fb_width / (float) wnd_width;
436 vertices[0][0] = 0.5f;
437 vertices[0][1] = (float) (fb_height - floor(cursor_y * scale) - 1.f + 0.5f);
438 vertices[1][0] = (float) fb_width + 0.5f;
439 vertices[1][1] = (float) (fb_height - floor(cursor_y * scale) - 1.f + 0.5f);
440 vertices[2][0] = (float) floor(cursor_x * scale) + 0.5f;
441 vertices[2][1] = 0.5f;
442 vertices[3][0] = (float) floor(cursor_x * scale) + 0.5f;
443 vertices[3][1] = (float) fb_height + 0.5f;
444
445 glBufferData(GL_ARRAY_BUFFER,
446 sizeof(vertices),
447 vertices,
448 GL_STREAM_DRAW);
449
450 mat4x4_ortho(mvp, 0.f, (float) fb_width, 0.f, (float) fb_height, 0.f, 1.f);
451 glUniformMatrix4fv(mvp_location, 1, GL_FALSE, (const GLfloat*) mvp);
452
453 glDrawArrays(GL_LINES, 0, 4);
454 }
455
456 glfwSwapBuffers(window);
457
458 if (animate_cursor)
459 {
460 const int i = (int) (glfwGetTime() * 30.0) % CURSOR_FRAME_COUNT;
461 if (current_frame != star_cursors[i])
462 {
463 glfwSetCursor(window, star_cursors[i]);
464 current_frame = star_cursors[i];
465 }
466 }
467 else
468 current_frame = NULL;
469
470 if (wait_events)
471 {
472 if (animate_cursor)
473 glfwWaitEventsTimeout(1.0 / 30.0);
474 else
475 glfwWaitEvents();
476 }
477 else
478 glfwPollEvents();
479
480 // Workaround for an issue with msvcrt and mintty
481 fflush(stdout);
482 }
483
484 glfwDestroyWindow(window);
485
486 for (i = 0; i < CURSOR_FRAME_COUNT; i++)
487 glfwDestroyCursor(star_cursors[i]);
488
489 for (i = 0; i < sizeof(standard_cursors) / sizeof(standard_cursors[0]); i++)
490 glfwDestroyCursor(standard_cursors[i]);
491
492 glfwTerminate();
493 exit(EXIT_SUCCESS);
494 }
495
496