boing.c
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1 /*****************************************************************************
2  * Title: GLBoing
3  * Desc: Tribute to Amiga Boing.
4  * Author: Jim Brooks <gfx@jimbrooks.org>
5  * Original Amiga authors were R.J. Mical and Dale Luck.
6  * GLFW conversion by Marcus Geelnard
7  * Notes: - 360' = 2*PI [radian]
8  *
9  * - Distances between objects are created by doing a relative
10  * Z translations.
11  *
12  * - Although OpenGL enticingly supports alpha-blending,
13  * the shadow of the original Boing didn't affect the color
14  * of the grid.
15  *
16  * - [Marcus] Changed timing scheme from interval driven to frame-
17  * time based animation steps (which results in much smoother
18  * movement)
19  *
20  * History of Amiga Boing:
21  *
22  * Boing was demonstrated on the prototype Amiga (codenamed "Lorraine") in
23  * 1985. According to legend, it was written ad-hoc in one night by
24  * R. J. Mical and Dale Luck. Because the bouncing ball animation was so fast
25  * and smooth, attendees did not believe the Amiga prototype was really doing
26  * the rendering. Suspecting a trick, they began looking around the booth for
27  * a hidden computer or VCR.
28  *****************************************************************************/
29 
30 #if defined(_MSC_VER)
31  // Make MS math.h define M_PI
32  #define _USE_MATH_DEFINES
33 #endif
34 
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <math.h>
38 
39 #include <glad/glad.h>
40 #include <GLFW/glfw3.h>
41 
42 #include <linmath.h>
43 
44 
45 /*****************************************************************************
46  * Various declarations and macros
47  *****************************************************************************/
48 
49 /* Prototypes */
50 void init( void );
51 void display( void );
52 void reshape( GLFWwindow* window, int w, int h );
53 void key_callback( GLFWwindow* window, int key, int scancode, int action, int mods );
54 void mouse_button_callback( GLFWwindow* window, int button, int action, int mods );
55 void cursor_position_callback( GLFWwindow* window, double x, double y );
56 void DrawBoingBall( void );
57 void BounceBall( double dt );
58 void DrawBoingBallBand( GLfloat long_lo, GLfloat long_hi );
59 void DrawGrid( void );
60 
61 #define RADIUS 70.f
62 #define STEP_LONGITUDE 22.5f /* 22.5 makes 8 bands like original Boing */
63 #define STEP_LATITUDE 22.5f
64 
65 #define DIST_BALL (RADIUS * 2.f + RADIUS * 0.1f)
66 
67 #define VIEW_SCENE_DIST (DIST_BALL * 3.f + 200.f)/* distance from viewer to middle of boing area */
68 #define GRID_SIZE (RADIUS * 4.5f) /* length (width) of grid */
69 #define BOUNCE_HEIGHT (RADIUS * 2.1f)
70 #define BOUNCE_WIDTH (RADIUS * 2.1f)
71 
72 #define SHADOW_OFFSET_X -20.f
73 #define SHADOW_OFFSET_Y 10.f
74 #define SHADOW_OFFSET_Z 0.f
75 
76 #define WALL_L_OFFSET 0.f
77 #define WALL_R_OFFSET 5.f
78 
79 /* Animation speed (50.0 mimics the original GLUT demo speed) */
80 #define ANIMATION_SPEED 50.f
81 
82 /* Maximum allowed delta time per physics iteration */
83 #define MAX_DELTA_T 0.02f
84 
85 /* Draw ball, or its shadow */
87 
88 /* Vertex type */
89 typedef struct {float x; float y; float z;} vertex_t;
90 
91 /* Global vars */
104 double t;
105 double t_old = 0.f;
106 double dt;
107 
108 /* Random number generator */
109 #ifndef RAND_MAX
110  #define RAND_MAX 4095
111 #endif
112 
113 
114 /*****************************************************************************
115  * Truncate a degree.
116  *****************************************************************************/
118 {
119  if ( deg >= 360.f )
120  return (deg - 360.f);
121  else
122  return deg;
123 }
124 
125 /*****************************************************************************
126  * Convert a degree (360-based) into a radian.
127  * 360' = 2 * PI
128  *****************************************************************************/
129 double deg2rad( double deg )
130 {
131  return deg / 360 * (2 * M_PI);
132 }
133 
134 /*****************************************************************************
135  * 360' sin().
136  *****************************************************************************/
137 double sin_deg( double deg )
138 {
139  return sin( deg2rad( deg ) );
140 }
141 
142 /*****************************************************************************
143  * 360' cos().
144  *****************************************************************************/
145 double cos_deg( double deg )
146 {
147  return cos( deg2rad( deg ) );
148 }
149 
150 /*****************************************************************************
151  * Compute a cross product (for a normal vector).
152  *
153  * c = a x b
154  *****************************************************************************/
156 {
157  GLfloat u1, u2, u3;
158  GLfloat v1, v2, v3;
159 
160  u1 = b.x - a.x;
161  u2 = b.y - a.y;
162  u3 = b.y - a.z;
163 
164  v1 = c.x - a.x;
165  v2 = c.y - a.y;
166  v3 = c.z - a.z;
167 
168  n->x = u2 * v3 - v2 * v3;
169  n->y = u3 * v1 - v3 * u1;
170  n->z = u1 * v2 - v1 * u2;
171 }
172 
173 
174 #define BOING_DEBUG 0
175 
176 
177 /*****************************************************************************
178  * init()
179  *****************************************************************************/
180 void init( void )
181 {
182  /*
183  * Clear background.
184  */
185  glClearColor( 0.55f, 0.55f, 0.55f, 0.f );
186 
188 }
189 
190 
191 /*****************************************************************************
192  * display()
193  *****************************************************************************/
194 void display(void)
195 {
197  glPushMatrix();
198 
200  DrawBoingBall();
201 
202  DrawGrid();
203 
205  DrawBoingBall();
206 
207  glPopMatrix();
208  glFlush();
209 }
210 
211 
212 /*****************************************************************************
213  * reshape()
214  *****************************************************************************/
215 void reshape( GLFWwindow* window, int w, int h )
216 {
217  mat4x4 projection, view;
218 
219  glViewport( 0, 0, (GLsizei)w, (GLsizei)h );
220 
222  mat4x4_perspective( projection,
223  2.f * (float) atan2( RADIUS, 200.f ),
224  (float)w / (float)h,
225  1.f, VIEW_SCENE_DIST );
226  glLoadMatrixf((const GLfloat*) projection);
227 
229  {
230  vec3 eye = { 0.f, 0.f, VIEW_SCENE_DIST };
231  vec3 center = { 0.f, 0.f, 0.f };
232  vec3 up = { 0.f, -1.f, 0.f };
233  mat4x4_look_at( view, eye, center, up );
234  }
235  glLoadMatrixf((const GLfloat*) view);
236 }
237 
238 void key_callback( GLFWwindow* window, int key, int scancode, int action, int mods )
239 {
240  if (action != GLFW_PRESS)
241  return;
242 
243  if (key == GLFW_KEY_ESCAPE && mods == 0)
245  if ((key == GLFW_KEY_ENTER && mods == GLFW_MOD_ALT) ||
246  (key == GLFW_KEY_F11 && mods == GLFW_MOD_ALT))
247  {
248  if (glfwGetWindowMonitor(window))
249  {
250  glfwSetWindowMonitor(window, NULL,
253  }
254  else
255  {
256  GLFWmonitor* monitor = glfwGetPrimaryMonitor();
257  if (monitor)
258  {
259  const GLFWvidmode* mode = glfwGetVideoMode(monitor);
262  glfwSetWindowMonitor(window, monitor, 0, 0, mode->width, mode->height, mode->refreshRate);
263  }
264  }
265  }
266 }
267 
268 static void set_ball_pos ( GLfloat x, GLfloat y )
269 {
270  ball_x = (width / 2) - x;
271  ball_y = y - (height / 2);
272 }
273 
274 void mouse_button_callback( GLFWwindow* window, int button, int action, int mods )
275 {
276  if (button != GLFW_MOUSE_BUTTON_LEFT)
277  return;
278 
279  if (action == GLFW_PRESS)
280  {
283  }
284  else
285  {
287  }
288 }
289 
290 void cursor_position_callback( GLFWwindow* window, double x, double y )
291 {
292  cursor_x = (float) x;
293  cursor_y = (float) y;
294 
295  if ( override_pos )
297 }
298 
299 /*****************************************************************************
300  * Draw the Boing ball.
301  *
302  * The Boing ball is sphere in which each facet is a rectangle.
303  * Facet colors alternate between red and white.
304  * The ball is built by stacking latitudinal circles. Each circle is composed
305  * of a widely-separated set of points, so that each facet is noticably large.
306  *****************************************************************************/
307 void DrawBoingBall( void )
308 {
309  GLfloat lon_deg; /* degree of longitude */
310  double dt_total, dt2;
311 
312  glPushMatrix();
314 
315  /*
316  * Another relative Z translation to separate objects.
317  */
318  glTranslatef( 0.0, 0.0, DIST_BALL );
319 
320  /* Update ball position and rotation (iterate if necessary) */
321  dt_total = dt;
322  while( dt_total > 0.0 )
323  {
324  dt2 = dt_total > MAX_DELTA_T ? MAX_DELTA_T : dt_total;
325  dt_total -= dt2;
326  BounceBall( dt2 );
328  }
329 
330  /* Set ball position */
331  glTranslatef( ball_x, ball_y, 0.0 );
332 
333  /*
334  * Offset the shadow.
335  */
336  if ( drawBallHow == DRAW_BALL_SHADOW )
337  {
340  SHADOW_OFFSET_Z );
341  }
342 
343  /*
344  * Tilt the ball.
345  */
346  glRotatef( -20.0, 0.0, 0.0, 1.0 );
347 
348  /*
349  * Continually rotate ball around Y axis.
350  */
351  glRotatef( deg_rot_y, 0.0, 1.0, 0.0 );
352 
353  /*
354  * Set OpenGL state for Boing ball.
355  */
356  glCullFace( GL_FRONT );
359 
360  /*
361  * Build a faceted latitude slice of the Boing ball,
362  * stepping same-sized vertical bands of the sphere.
363  */
364  for ( lon_deg = 0;
365  lon_deg < 180;
366  lon_deg += STEP_LONGITUDE )
367  {
368  /*
369  * Draw a latitude circle at this longitude.
370  */
371  DrawBoingBallBand( lon_deg,
372  lon_deg + STEP_LONGITUDE );
373  }
374 
375  glPopMatrix();
376 
377  return;
378 }
379 
380 
381 /*****************************************************************************
382  * Bounce the ball.
383  *****************************************************************************/
384 void BounceBall( double delta_t )
385 {
386  GLfloat sign;
387  GLfloat deg;
388 
389  if ( override_pos )
390  return;
391 
392  /* Bounce on walls */
393  if ( ball_x > (BOUNCE_WIDTH/2 + WALL_R_OFFSET ) )
394  {
395  ball_x_inc = -0.5f - 0.75f * (GLfloat)rand() / (GLfloat)RAND_MAX;
397  }
398  if ( ball_x < -(BOUNCE_HEIGHT/2 + WALL_L_OFFSET) )
399  {
400  ball_x_inc = 0.5f + 0.75f * (GLfloat)rand() / (GLfloat)RAND_MAX;
402  }
403 
404  /* Bounce on floor / roof */
405  if ( ball_y > BOUNCE_HEIGHT/2 )
406  {
407  ball_y_inc = -0.75f - 1.f * (GLfloat)rand() / (GLfloat)RAND_MAX;
408  }
409  if ( ball_y < -BOUNCE_HEIGHT/2*0.85 )
410  {
411  ball_y_inc = 0.75f + 1.f * (GLfloat)rand() / (GLfloat)RAND_MAX;
412  }
413 
414  /* Update ball position */
415  ball_x += ball_x_inc * ((float)delta_t*ANIMATION_SPEED);
416  ball_y += ball_y_inc * ((float)delta_t*ANIMATION_SPEED);
417 
418  /*
419  * Simulate the effects of gravity on Y movement.
420  */
421  if ( ball_y_inc < 0 ) sign = -1.0; else sign = 1.0;
422 
423  deg = (ball_y + BOUNCE_HEIGHT/2) * 90 / BOUNCE_HEIGHT;
424  if ( deg > 80 ) deg = 80;
425  if ( deg < 10 ) deg = 10;
426 
427  ball_y_inc = sign * 4.f * (float) sin_deg( deg );
428 }
429 
430 
431 /*****************************************************************************
432  * Draw a faceted latitude band of the Boing ball.
433  *
434  * Parms: long_lo, long_hi
435  * Low and high longitudes of slice, resp.
436  *****************************************************************************/
438  GLfloat long_hi )
439 {
440  vertex_t vert_ne; /* "ne" means south-east, so on */
441  vertex_t vert_nw;
442  vertex_t vert_sw;
443  vertex_t vert_se;
444  vertex_t vert_norm;
445  GLfloat lat_deg;
446  static int colorToggle = 0;
447 
448  /*
449  * Iterate thru the points of a latitude circle.
450  * A latitude circle is a 2D set of X,Z points.
451  */
452  for ( lat_deg = 0;
453  lat_deg <= (360 - STEP_LATITUDE);
454  lat_deg += STEP_LATITUDE )
455  {
456  /*
457  * Color this polygon with red or white.
458  */
459  if ( colorToggle )
460  glColor3f( 0.8f, 0.1f, 0.1f );
461  else
462  glColor3f( 0.95f, 0.95f, 0.95f );
463 #if 0
464  if ( lat_deg >= 180 )
465  if ( colorToggle )
466  glColor3f( 0.1f, 0.8f, 0.1f );
467  else
468  glColor3f( 0.5f, 0.5f, 0.95f );
469 #endif
470  colorToggle = ! colorToggle;
471 
472  /*
473  * Change color if drawing shadow.
474  */
475  if ( drawBallHow == DRAW_BALL_SHADOW )
476  glColor3f( 0.35f, 0.35f, 0.35f );
477 
478  /*
479  * Assign each Y.
480  */
481  vert_ne.y = vert_nw.y = (float) cos_deg(long_hi) * RADIUS;
482  vert_sw.y = vert_se.y = (float) cos_deg(long_lo) * RADIUS;
483 
484  /*
485  * Assign each X,Z with sin,cos values scaled by latitude radius indexed by longitude.
486  * Eg, long=0 and long=180 are at the poles, so zero scale is sin(longitude),
487  * while long=90 (sin(90)=1) is at equator.
488  */
489  vert_ne.x = (float) cos_deg( lat_deg ) * (RADIUS * (float) sin_deg( long_lo + STEP_LONGITUDE ));
490  vert_se.x = (float) cos_deg( lat_deg ) * (RADIUS * (float) sin_deg( long_lo ));
491  vert_nw.x = (float) cos_deg( lat_deg + STEP_LATITUDE ) * (RADIUS * (float) sin_deg( long_lo + STEP_LONGITUDE ));
492  vert_sw.x = (float) cos_deg( lat_deg + STEP_LATITUDE ) * (RADIUS * (float) sin_deg( long_lo ));
493 
494  vert_ne.z = (float) sin_deg( lat_deg ) * (RADIUS * (float) sin_deg( long_lo + STEP_LONGITUDE ));
495  vert_se.z = (float) sin_deg( lat_deg ) * (RADIUS * (float) sin_deg( long_lo ));
496  vert_nw.z = (float) sin_deg( lat_deg + STEP_LATITUDE ) * (RADIUS * (float) sin_deg( long_lo + STEP_LONGITUDE ));
497  vert_sw.z = (float) sin_deg( lat_deg + STEP_LATITUDE ) * (RADIUS * (float) sin_deg( long_lo ));
498 
499  /*
500  * Draw the facet.
501  */
502  glBegin( GL_POLYGON );
503 
504  CrossProduct( vert_ne, vert_nw, vert_sw, &vert_norm );
505  glNormal3f( vert_norm.x, vert_norm.y, vert_norm.z );
506 
507  glVertex3f( vert_ne.x, vert_ne.y, vert_ne.z );
508  glVertex3f( vert_nw.x, vert_nw.y, vert_nw.z );
509  glVertex3f( vert_sw.x, vert_sw.y, vert_sw.z );
510  glVertex3f( vert_se.x, vert_se.y, vert_se.z );
511 
512  glEnd();
513 
514 #if BOING_DEBUG
515  printf( "----------------------------------------------------------- \n" );
516  printf( "lat = %f long_lo = %f long_hi = %f \n", lat_deg, long_lo, long_hi );
517  printf( "vert_ne x = %.8f y = %.8f z = %.8f \n", vert_ne.x, vert_ne.y, vert_ne.z );
518  printf( "vert_nw x = %.8f y = %.8f z = %.8f \n", vert_nw.x, vert_nw.y, vert_nw.z );
519  printf( "vert_se x = %.8f y = %.8f z = %.8f \n", vert_se.x, vert_se.y, vert_se.z );
520  printf( "vert_sw x = %.8f y = %.8f z = %.8f \n", vert_sw.x, vert_sw.y, vert_sw.z );
521 #endif
522 
523  }
524 
525  /*
526  * Toggle color so that next band will opposite red/white colors than this one.
527  */
528  colorToggle = ! colorToggle;
529 
530  /*
531  * This circular band is done.
532  */
533  return;
534 }
535 
536 
537 /*****************************************************************************
538  * Draw the purple grid of lines, behind the Boing ball.
539  * When the Workbench is dropped to the bottom, Boing shows 12 rows.
540  *****************************************************************************/
541 void DrawGrid( void )
542 {
543  int row, col;
544  const int rowTotal = 12; /* must be divisible by 2 */
545  const int colTotal = rowTotal; /* must be same as rowTotal */
546  const GLfloat widthLine = 2.0; /* should be divisible by 2 */
547  const GLfloat sizeCell = GRID_SIZE / rowTotal;
548  const GLfloat z_offset = -40.0;
549  GLfloat xl, xr;
550  GLfloat yt, yb;
551 
552  glPushMatrix();
554 
555  /*
556  * Another relative Z translation to separate objects.
557  */
558  glTranslatef( 0.0, 0.0, DIST_BALL );
559 
560  /*
561  * Draw vertical lines (as skinny 3D rectangles).
562  */
563  for ( col = 0; col <= colTotal; col++ )
564  {
565  /*
566  * Compute co-ords of line.
567  */
568  xl = -GRID_SIZE / 2 + col * sizeCell;
569  xr = xl + widthLine;
570 
571  yt = GRID_SIZE / 2;
572  yb = -GRID_SIZE / 2 - widthLine;
573 
574  glBegin( GL_POLYGON );
575 
576  glColor3f( 0.6f, 0.1f, 0.6f ); /* purple */
577 
578  glVertex3f( xr, yt, z_offset ); /* NE */
579  glVertex3f( xl, yt, z_offset ); /* NW */
580  glVertex3f( xl, yb, z_offset ); /* SW */
581  glVertex3f( xr, yb, z_offset ); /* SE */
582 
583  glEnd();
584  }
585 
586  /*
587  * Draw horizontal lines (as skinny 3D rectangles).
588  */
589  for ( row = 0; row <= rowTotal; row++ )
590  {
591  /*
592  * Compute co-ords of line.
593  */
594  yt = GRID_SIZE / 2 - row * sizeCell;
595  yb = yt - widthLine;
596 
597  xl = -GRID_SIZE / 2;
598  xr = GRID_SIZE / 2 + widthLine;
599 
600  glBegin( GL_POLYGON );
601 
602  glColor3f( 0.6f, 0.1f, 0.6f ); /* purple */
603 
604  glVertex3f( xr, yt, z_offset ); /* NE */
605  glVertex3f( xl, yt, z_offset ); /* NW */
606  glVertex3f( xl, yb, z_offset ); /* SW */
607  glVertex3f( xr, yb, z_offset ); /* SE */
608 
609  glEnd();
610  }
611 
612  glPopMatrix();
613 
614  return;
615 }
616 
617 
618 /*======================================================================*
619  * main()
620  *======================================================================*/
621 
622 int main( void )
623 {
625 
626  /* Init GLFW */
627  if( !glfwInit() )
628  exit( EXIT_FAILURE );
629 
630  window = glfwCreateWindow( 400, 400, "Boing (classic Amiga demo)", NULL, NULL );
631  if (!window)
632  {
633  glfwTerminate();
634  exit( EXIT_FAILURE );
635  }
636 
637  glfwSetWindowAspectRatio(window, 1, 1);
638 
643 
644  glfwMakeContextCurrent(window);
646  glfwSwapInterval( 1 );
647 
648  glfwGetFramebufferSize(window, &width, &height);
649  reshape(window, width, height);
650 
651  glfwSetTime( 0.0 );
652 
653  init();
654 
655  /* Main loop */
656  for (;;)
657  {
658  /* Timing */
659  t = glfwGetTime();
660  dt = t - t_old;
661  t_old = t;
662 
663  /* Draw one frame */
664  display();
665 
666  /* Swap buffers */
667  glfwSwapBuffers(window);
668  glfwPollEvents();
669 
670  /* Check if we are still running */
671  if (glfwWindowShouldClose(window))
672  break;
673  }
674 
675  glfwTerminate();
676  exit( EXIT_SUCCESS );
677 }
678 
#define glShadeModel
GLFWAPI void glfwSetWindowAspectRatio(GLFWwindow *window, int numer, int denom)
Sets the aspect ratio of the specified window.
Definition: window.c:618
double sin_deg(double deg)
Definition: boing.c:137
void DrawBoingBall(void)
Definition: boing.c:307
#define WALL_R_OFFSET
Definition: boing.c:77
int height
Definition: glfw3.h:1532
GLboolean GLboolean GLboolean b
GLint y
GLFWAPI void glfwGetWindowSize(GLFWwindow *window, int *width, int *height)
Retrieves the size of the client area of the specified window.
Definition: window.c:544
GLenum GLenum GLsizei void * row
vec4 mat4x4[4]
Definition: linmath.h:83
khronos_float_t GLfloat
GLfloat deg_rot_y
Definition: boing.c:94
#define glRotatef
The header of the GLFW 3 API.
GLFWAPI GLFWglproc glfwGetProcAddress(const char *procname)
Returns the address of the specified function for the current context.
Definition: context.c:741
int main(void)
Definition: boing.c:622
#define glBegin
#define SHADOW_OFFSET_Z
Definition: boing.c:74
void *(* GLADloadproc)(const char *name)
static GLFWwindow * window
Definition: joysticks.c:55
double dt
Definition: boing.c:106
int width
Definition: glfw3.h:1529
#define glPopMatrix
#define GL_PROJECTION
GLFWAPI const GLFWvidmode * glfwGetVideoMode(GLFWmonitor *monitor)
Returns the current mode of the specified monitor.
Definition: monitor.c:417
struct GLFWmonitor GLFWmonitor
#define MAX_DELTA_T
Definition: boing.c:83
#define glCullFace
GLFWAPI GLFWmousebuttonfun glfwSetMouseButtonCallback(GLFWwindow *window, GLFWmousebuttonfun cbfun)
Sets the mouse button callback.
Definition: input.c:821
int GLsizei
#define GLFW_FALSE
Zero.
Definition: glfw3.h:287
#define VIEW_SCENE_DIST
Definition: boing.c:67
int refreshRate
Definition: glfw3.h:1544
#define GL_POLYGON
float z
Definition: boing.c:89
#define GLFW_MOUSE_BUTTON_LEFT
Definition: glfw3.h:546
void mouse_button_callback(GLFWwindow *window, int button, int action, int mods)
Definition: boing.c:274
GLfloat ball_x
Definition: boing.c:99
#define glFlush
GLdouble GLdouble GLdouble w
GLFWAPI GLFWframebuffersizefun glfwSetFramebufferSizeCallback(GLFWwindow *window, GLFWframebuffersizefun cbfun)
Sets the framebuffer resize callback for the specified window.
Definition: window.c:1050
int windowed_ypos
Definition: boing.c:92
GLfloat GLfloat GLfloat GLfloat h
Definition: glext.h:1960
#define GL_FLAT
GLdouble n
Definition: glext.h:1966
#define glVertex3f
void BounceBall(double dt)
Definition: boing.c:384
GLdouble GLdouble u2
#define WALL_L_OFFSET
Definition: boing.c:76
#define glEnable
static void mat4x4_perspective(mat4x4 m, float y_fov, float aspect, float n, float f)
Definition: linmath.h:357
GLfloat ball_x_inc
Definition: boing.c:101
#define SHADOW_OFFSET_Y
Definition: boing.c:73
GLdouble t
GLboolean GLboolean GLboolean GLboolean a
GLuint64 key
Definition: glext.h:8966
double deg2rad(double deg)
Definition: boing.c:129
void reshape(GLFWwindow *window, int w, int h)
Definition: boing.c:215
float y
Definition: boing.c:89
GLFWAPI int glfwInit(void)
Initializes the GLFW library.
Definition: init.c:198
GLdouble f
GLfloat cursor_y
Definition: boing.c:98
GLenum mode
DRAW_BALL_ENUM
Definition: boing.c:86
void DrawBoingBallBand(GLfloat long_lo, GLfloat long_hi)
Definition: boing.c:437
GLfloat ball_y
Definition: boing.c:100
#define GL_COLOR_BUFFER_BIT
void DrawGrid(void)
Definition: boing.c:541
const GLubyte * c
Definition: glext.h:12690
#define GLFW_KEY_F11
Definition: glfw3.h:441
GLdouble x
GLFWAPI void glfwSwapInterval(int interval)
Sets the swap interval for the current context.
Definition: context.c:658
#define glPushMatrix
#define glLoadMatrixf
#define GLFW_KEY_ESCAPE
Definition: glfw3.h:412
#define glClear
Definition: boing.c:89
GLint GLsizei GLsizei height
DRAW_BALL_ENUM drawBallHow
Definition: boing.c:103
GLFWAPI void glfwSwapBuffers(GLFWwindow *window)
Swaps the front and back buffers of the specified window.
Definition: context.c:641
GLFWAPI void glfwMakeContextCurrent(GLFWwindow *window)
Makes the context of the specified window current for the calling thread.
Definition: context.c:611
#define glTranslatef
static void mat4x4_look_at(mat4x4 m, vec3 eye, vec3 center, vec3 up)
Definition: linmath.h:383
#define glNormal3f
GLfloat GLfloat GLfloat GLfloat v3
int override_pos
Definition: boing.c:96
void init(void)
Definition: boing.c:180
GLFWAPI GLFWcursorposfun glfwSetCursorPosCallback(GLFWwindow *window, GLFWcursorposfun cbfun)
Sets the cursor position callback.
Definition: input.c:832
#define glEnd
#define GLFW_KEY_ENTER
Definition: glfw3.h:413
float x
Definition: boing.c:89
#define STEP_LONGITUDE
Definition: boing.c:62
#define GLFW_MOD_ALT
If this bit is set one or more Alt keys were held down.
Definition: glfw3.h:509
#define GL_FRONT
action
Definition: enums.py:62
GLAPI int gladLoadGLLoader(GLADloadproc)
Definition: glad/glad.c:1697
#define glViewport
GLFWAPI GLFWmonitor * glfwGetWindowMonitor(GLFWwindow *window)
Returns the monitor that the window uses for full screen mode.
Definition: window.c:907
#define GL_DEPTH_BUFFER_BIT
#define GL_MODELVIEW
static const textual_icon exit
Definition: model-views.h:254
double cos_deg(double deg)
Definition: boing.c:145
GLFWAPI void glfwSetWindowShouldClose(GLFWwindow *window, int value)
Sets the close flag of the specified window.
Definition: window.c:486
static void set_ball_pos(GLfloat x, GLfloat y)
Definition: boing.c:268
#define RAND_MAX
Definition: boing.c:110
GLFWAPI void glfwSetTime(double time)
Sets the GLFW timer.
Definition: input.c:1282
GLFWAPI void glfwSetWindowMonitor(GLFWwindow *window, GLFWmonitor *monitor, int xpos, int ypos, int width, int height, int refreshRate)
Sets the mode, monitor, video mode and placement of a window.
Definition: window.c:916
GLFWAPI GLFWwindow * glfwCreateWindow(int width, int height, const char *title, GLFWmonitor *monitor, GLFWwindow *share)
Creates a window and its associated context.
Definition: window.c:151
#define GLFW_TRUE
One.
Definition: glfw3.h:279
GLdouble GLdouble GLint GLint GLdouble v1
#define STEP_LATITUDE
Definition: boing.c:63
#define GL_CULL_FACE
GLFWAPI double glfwGetTime(void)
Returns the value of the GLFW timer.
Definition: input.c:1275
#define glColor3f
int windowed_height
Definition: boing.c:92
Video mode type.
Definition: glfw3.h:1525
int width
Definition: boing.c:93
GLFWAPI void glfwGetWindowPos(GLFWwindow *window, int *xpos, int *ypos)
Retrieves the position of the client area of the specified window.
Definition: window.c:517
double t
Definition: boing.c:104
double t_old
Definition: boing.c:105
GLfloat ball_y_inc
Definition: boing.c:102
GLFWAPI GLFWmonitor * glfwGetPrimaryMonitor(void)
Returns the primary monitor.
Definition: monitor.c:308
GLFWAPI void glfwGetFramebufferSize(GLFWwindow *window, int *width, int *height)
Retrieves the size of the framebuffer of the specified window.
Definition: window.c:647
GLFWAPI void glfwTerminate(void)
Terminates the GLFW library.
Definition: init.c:243
int windowed_width
Definition: boing.c:92
#define RADIUS
Definition: boing.c:61
#define glClearColor
GLFWAPI GLFWkeyfun glfwSetKeyCallback(GLFWwindow *window, GLFWkeyfun cbfun)
Sets the key callback.
Definition: input.c:791
void display(void)
Definition: boing.c:194
GLFWAPI void glfwPollEvents(void)
Processes all pending events.
Definition: window.c:1072
#define DIST_BALL
Definition: boing.c:65
#define GRID_SIZE
Definition: boing.c:68
int windowed_xpos
Definition: boing.c:92
#define NULL
Definition: tinycthread.c:47
GLdouble u1
GLfloat cursor_x
Definition: boing.c:97
const GLdouble * v2
GLfloat TruncateDeg(GLfloat deg)
Definition: boing.c:117
#define SHADOW_OFFSET_X
Definition: boing.c:72
void key_callback(GLFWwindow *window, int key, int scancode, int action, int mods)
Definition: boing.c:238
#define ANIMATION_SPEED
Definition: boing.c:80
#define GLFW_PRESS
The key or mouse button was pressed.
Definition: glfw3.h:304
#define BOUNCE_HEIGHT
Definition: boing.c:69
GLfloat deg_rot_y_inc
Definition: boing.c:95
#define glMatrixMode
struct GLFWwindow GLFWwindow
void CrossProduct(vertex_t a, vertex_t b, vertex_t c, vertex_t *n)
Definition: boing.c:155
GLint GLsizei width
int height
Definition: boing.c:93
void cursor_position_callback(GLFWwindow *window, double x, double y)
Definition: boing.c:290
#define glDisable
GLFWAPI int glfwWindowShouldClose(GLFWwindow *window)
Checks the close flag of the specified window.
Definition: window.c:477
#define BOUNCE_WIDTH
Definition: boing.c:70
#define GL_NORMALIZE


librealsense2
Author(s): Sergey Dorodnicov , Doron Hirshberg , Mark Horn , Reagan Lopez , Itay Carpis
autogenerated on Mon May 3 2021 02:45:07