events.c

   1 /*******************************************************************************
   2 **3456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789
   3 **      10        20        30        40        50        60        70        80
   4 **
   5 ** file:
   6 **    events.c
   7 **
   8 ** author:
   9 **    Mirco "MacSlow" Mueller <macslow@bangang.de>
  10 **
  11 ** copyright (C) Mirco Mueller, 2006/2007, placed under the terms of the GPL
  12 **
  13 *******************************************************************************/
  14
  15 #include "events.h"
  16 #include "cairo-rendering.h"
  17
  18 #include <gdk/gdkkeysyms.h>
  19 #include <GL/gl.h>
  20 #include <GL/glu.h>
  21 #include <GL/glut.h>
  22
  23 #include "globals.h"
  24
  25 GLfloat g_afAngle[3] = {260.0f, -58.0f, 0.0f};
  26 GLfloat g_fScale = 1.2f;
  27 GLfloat g_fAlpha = 1.0f;
  28 gdouble g_fCurrentX;
  29 gdouble g_fCurrentY;
  30 gdouble g_fDeltaX;
  31 gdouble g_fDeltaY;
  32 gdouble g_fLastX;
  33 gdouble g_fLastY;
  34 gboolean g_bLMBPressed = FALSE;
  35 gboolean g_bRMBPressed = FALSE;
  36 GLuint g_auiColorBuffer[3];
  37
  38 gboolean
  39 delete_handler (GtkWidget* pWidget,
  40                 GdkEvent*  pEvent,
  41                 gpointer   data)
  42 {
  43         glDeleteTextures (3, g_auiColorBuffer);
  44         gtk_main_quit ();
  45         return TRUE;
  46 }
  47
  48 gboolean
  49 button_handler (GtkWidget*      pWidget,
  50                 GdkEventButton* pEvent,
  51                 gpointer        data)
  52 {
  53         switch (pEvent->button)
  54         {
  55                 case 1:
  56                         if (pEvent->type == GDK_BUTTON_PRESS)
  57                         {
  58                                 g_fCurrentX = pEvent->x;
  59                                 g_fCurrentY = pEvent->y;
  60                                 g_fLastX = g_fCurrentX;
  61                                 g_fLastY = g_fCurrentY;
  62                                 g_bLMBPressed = TRUE;
  63                         }
  64                         else if (pEvent->type == GDK_BUTTON_RELEASE)
  65                                 g_bLMBPressed = FALSE;
  66                 break;
  67
  68                 case 3:
  69                         if (pEvent->type == GDK_BUTTON_PRESS)
  70                         {
  71                                 g_fCurrentX = pEvent->x;
  72                                 g_fCurrentY = pEvent->y;
  73                                 g_fLastX = g_fCurrentX;
  74                                 g_fLastY = g_fCurrentY;
  75                                 g_bRMBPressed = TRUE;
  76                         }
  77                         else if (pEvent->type == GDK_BUTTON_RELEASE)
  78                                 g_bRMBPressed = FALSE;
  79                 break;
  80         }
  81
  82         return TRUE;
  83 }
  84
  85 gboolean
  86 scroll_handler (GtkWidget*      pWidget,
  87                 GdkEventScroll* pEvent,
  88                 gpointer        data)
  89 {
  90         switch (pEvent->direction)
  91         {
  92                 case GDK_SCROLL_UP:
  93                         if (g_fAlpha < 1.0f)
  94                                 g_fAlpha += 0.05f;
  95                 break;
  96
  97                 case GDK_SCROLL_DOWN:
  98                         if (g_fAlpha > 0.0f)
  99                                 g_fAlpha -= 0.05f;
 100                 break;
 101
 102                 /* just silence gcc */
 103                 default:
 104                 break;
 105         }
 106
 107         return TRUE;
 108 }
 109
 110 gboolean
 111 motion_notify_handler (GtkWidget*      pWidget,
 112                        GdkEventMotion* pEvent,
 113                        gpointer        data)
 114 {
 115         if (g_bLMBPressed)
 116         {
 117                 g_fCurrentX = pEvent->x;
 118                 g_fCurrentY = pEvent->y;
 119                 g_fDeltaX = g_fLastX - g_fCurrentX;
 120                 g_fDeltaY = g_fLastY - g_fCurrentY;
 121                 g_fLastX = g_fCurrentX;
 122                 g_fLastY = g_fCurrentY;
 123
 124                 g_afAngle[0] -= g_fDeltaX;
 125                 g_afAngle[1] -= g_fDeltaY;
 126                 gtk_widget_queue_draw (pWidget);
 127         }
 128
 129         if (g_bRMBPressed)
 130         {
 131                 g_fCurrentY = pEvent->y;
 132                 g_fDeltaY = g_fLastY - g_fCurrentY;
 133                 g_fLastY = g_fCurrentY;
 134
 135                 g_fScale -= g_fDeltaY / 100.0f;
 136                 gtk_widget_queue_draw (pWidget);
 137         }
 138
 139         return TRUE;
 140 }
 141
 142 void
 143 screen_changed_handler (GtkWidget* pWidget,
 144                         GdkScreen* pOldScreen,
 145                         gpointer   data)
 146 {
 147         GdkScreen* pScreen = gtk_widget_get_screen (pWidget);
 148         GdkColormap* pColormap = gdk_screen_get_rgba_colormap (pScreen);
 149
 150         if (!pColormap)
 151         {
 152                 g_print ("Could not get a RGBA-colormap. Using plain RGB.\n");
 153                 pColormap = gdk_screen_get_rgb_colormap (pScreen);
 154         }
 155
 156         gtk_widget_set_colormap (pWidget, pColormap);
 157 }
 158
 159 void
 160 realize_handler (GtkWidget* pWidget,
 161                  gpointer   data)
 162 {
 163         GLfloat afLightDiffuse[] = {1.0f, 1.0f, 1.0f, 1.0f};
 164         GdkGLContext* pGlContext = gtk_widget_get_gl_context (pWidget);
 165         GdkGLDrawable* pGlDrawable = gtk_widget_get_gl_drawable (pWidget);
 166
 167         /* make GL-context "current" */
 168         if (!gdk_gl_drawable_gl_begin (pGlDrawable, pGlContext))
 169                 return;
 170
 171         glColor4f (1.0f, 1.0f, 1.0f, 1.0f);
 172         glClearColor (0.0f, 0.0f, 0.0f, 0.0f);
 173         glClearDepth (1.0f);
 174         glDisable (GL_DEPTH_TEST);
 175         glEnable (GL_NORMALIZE);
 176         glEnable (GL_BLEND);
 177         glBlendFunc (GL_ONE, GL_ONE);
 178         glShadeModel (GL_FLAT);
 179         glEnable (GL_TEXTURE_RECTANGLE_ARB);
 180         glPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
 181         glDisable (GL_CULL_FACE);
 182         glLightModelf (GL_LIGHT_MODEL_TWO_SIDE, 0.0f);
 183         glEnable (GL_LIGHTING);
 184         glEnable (GL_LIGHT0);
 185         glLightfv (GL_LIGHT0, GL_DIFFUSE, afLightDiffuse);
 186
 187         g_print ("OpenGL version: %s\n", glGetString (GL_VERSION));
 188         g_print ("OpenGL vendor: %s\n", glGetString (GL_VENDOR));
 189         g_print ("OpenGL renderer: %s\n", glGetString (GL_RENDERER));
 190
 191         glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 192         glTexParameteri (GL_TEXTURE_RECTANGLE_ARB,
 193                          GL_TEXTURE_MIN_FILTER,
 194                          GL_LINEAR_MIPMAP_LINEAR);
 195         glTexParameteri (GL_TEXTURE_RECTANGLE_ARB,
 196                          GL_TEXTURE_MAG_FILTER,
 197                          GL_LINEAR);
 198
 199         glMatrixMode (GL_MODELVIEW);
 200         glLoadIdentity ();
 201         gluLookAt (0.0f, 0.0f, Z_NEAR,
 202                    0.0f, 0.0f, 0.0f,
 203                    0.0f, 1.0f, 0.0f);
 204         glTranslatef (0.0f, 0.0f, -Z_NEAR);
 205
 206         /* end drawing to current GL-context */
 207         gdk_gl_drawable_gl_end (pGlDrawable);
 208 }
 209
 210 gboolean
 211 configure_handler (GtkWidget*         pWidget,
 212                    GdkEventConfigure* pEvent,
 213                    gpointer           data)
 214 {
 215         GdkGLContext* pGlContext = gtk_widget_get_gl_context (pWidget);
 216         GdkGLDrawable* pGlDrawable = gtk_widget_get_gl_drawable (pWidget);
 217         GLsizei w = pWidget->allocation.width;
 218         GLsizei h = pWidget->allocation.height;
 219
 220         /* make GL-context "current" */
 221         if (!gdk_gl_drawable_gl_begin (pGlDrawable, pGlContext))
 222                 return FALSE;
 223
 224         glViewport (0, 0, w, h);
 225         glMatrixMode (GL_PROJECTION);
 226         glLoadIdentity ();
 227         gluPerspective (2.0f * FOVY_2, (GLfloat) w / (GLfloat) h, 0.1f, 50.0f);
 228
 229         glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 230
 231         glGenTextures (3, g_auiColorBuffer);
 232         glBindTexture (GL_TEXTURE_RECTANGLE_ARB, g_auiColorBuffer[0]);
 233         glTexImage2D (GL_TEXTURE_RECTANGLE_ARB,
 234                       0,
 235                       GL_RGBA,
 236                       g_iWidth,
 237                       g_iHeight,
 238                       0,
 239                       GL_BGRA,
 240                       GL_UNSIGNED_BYTE,
 241                       NULL);
 242
 243         glBindTexture (GL_TEXTURE_RECTANGLE_ARB, g_auiColorBuffer[1]);
 244         glTexImage2D (GL_TEXTURE_RECTANGLE_ARB,
 245                       0,
 246                       GL_RGBA,
 247                       g_iWidth,
 248                       g_iHeight,
 249                       0,
 250                       GL_BGRA,
 251                       GL_UNSIGNED_BYTE,
 252                       NULL);
 253
 254         glBindTexture (GL_TEXTURE_RECTANGLE_ARB, g_auiColorBuffer[2]);
 255         glTexImage2D (GL_TEXTURE_RECTANGLE_ARB,
 256                       0,
 257                       GL_RGBA,
 258                       g_iWidth,
 259                       g_iHeight,
 260                       0,
 261                       GL_BGRA,
 262                       GL_UNSIGNED_BYTE,
 263                       NULL);
 264
 265         /* end drawing to current GL-context */
 266         gdk_gl_drawable_gl_end (pGlDrawable);
 267
 268         return TRUE;
 269 }
 270
 271 gboolean
 272 expose_handler (GtkWidget*      pWidget,
 273                 GdkEventExpose* pEvent,
 274                 gpointer        data)
 275 {
 276         GdkGLContext* pGlContext = gtk_widget_get_gl_context (pWidget);
 277         GdkGLDrawable* pGlDrawable = gtk_widget_get_gl_drawable (pWidget);
 278         static gint iFrames = 0;
 279         static gdouble fLastTimeStamp = 0.0f;;
 280         static gdouble fCurrentTimeStamp = 0.0f;;
 281         static gdouble fLastFullSecond = 0.0f;;
 282         gdouble fFrameTimeDelta = 0.0f;
 283         gdouble fFullSecond = 0.0f;
 284         GLfloat afVector[3];
 285         GLfloat afMatrixBase[16];
 286         GLfloat afFrontDiffuseMat[] = {1.0f * g_fAlpha,
 287                                        1.0f * g_fAlpha,
 288                                        1.0f * g_fAlpha,
 289                                        1.0f * g_fAlpha};
 290         GLfloat afBackDiffuseMat[] = {1.0f * g_fAlpha,
 291                                       1.0f * g_fAlpha,
 292                                       1.0f * g_fAlpha,
 293                                       1.0f * g_fAlpha};
 294
 295         /* make GL-context "current" */
 296         if (!gdk_gl_drawable_gl_begin (pGlDrawable, pGlContext))
 297                 return FALSE;
 298
 299         glPushMatrix ();
 300         glTranslatef (0.0f, 0.0f, 0.5f);
 301         glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 302         glGetFloatv (GL_MODELVIEW_MATRIX, afMatrixBase);
 303         afVector[0] = afMatrixBase[0];
 304         afVector[1] = afMatrixBase[4];
 305         afVector[2] = afMatrixBase[8];
 306         glRotatef (g_afAngle[1] * 0.5f, afVector[0], afVector[1], afVector[2]);
 307         afVector[0] = afMatrixBase[1];
 308         afVector[1] = afMatrixBase[5];
 309         afVector[2] = afMatrixBase[9];
 310         glRotatef (g_afAngle[0] * 0.5f, afVector[0], afVector[1], afVector[2]);
 311         glScalef (g_fScale, g_fScale, g_fScale);
 312
 313         glMaterialfv (GL_FRONT, GL_DIFFUSE, afFrontDiffuseMat);
 314         glMaterialfv (GL_BACK, GL_DIFFUSE, afBackDiffuseMat);
 315
 316         render_zini (g_pCairoContext[0], g_iWidth, g_iHeight);
 317         advance (&g_lineOne.start);
 318         advance (&g_lineOne.end);
 319         advance (&g_lineTwo.start);
 320         advance (&g_lineTwo.end);
 321         render_curve (g_pCairoContext[1],
 322                       g_iWidth,
 323                       g_iHeight,
 324                       &g_lineOne,
 325                       &g_lineTwo);
 326         render_flower (g_pCairoContext[2], g_iWidth, g_iHeight);
 327
 328         glBindTexture (GL_TEXTURE_RECTANGLE_ARB, g_auiColorBuffer[0]);
 329         glTexImage2D (GL_TEXTURE_RECTANGLE_ARB,
 330                       0,
 331                       GL_RGBA,
 332                       g_iWidth,
 333                       g_iHeight,
 334                       0,
 335                       GL_BGRA,
 336                       GL_UNSIGNED_BYTE,
 337                       g_pucSurfaceData[0]);
 338
 339         glBindTexture (GL_TEXTURE_RECTANGLE_ARB, g_auiColorBuffer[1]);
 340         glTexImage2D (GL_TEXTURE_RECTANGLE_ARB,
 341                       0,
 342                       GL_RGBA,
 343                       g_iWidth,
 344                       g_iHeight,
 345                       0,
 346                       GL_BGRA,
 347                       GL_UNSIGNED_BYTE,
 348                       g_pucSurfaceData[1]);
 349
 350         glBindTexture (GL_TEXTURE_RECTANGLE_ARB, g_auiColorBuffer[2]);
 351         glTexImage2D (GL_TEXTURE_RECTANGLE_ARB,
 352                       0,
 353                       GL_RGBA,
 354                       g_iWidth,
 355                       g_iHeight,
 356                       0,
 357                       GL_BGRA,
 358                       GL_UNSIGNED_BYTE,
 359                       g_pucSurfaceData[2]);
 360
 361         glBindTexture (GL_TEXTURE_RECTANGLE_ARB, g_auiColorBuffer[0]);
 362         glBegin (GL_QUADS);
 363         glNormal3f (1.0f, 0.0f, 0.0f);
 364         glTexCoord2f (0.0f, 0.0f);
 365         glVertex3f (1.0f, 1.0f, 1.0f);
 366         glTexCoord2f ((GLfloat) g_iWidth, 0.0f);
 367         glVertex3f (1.0f, 1.0f, -1.0f);
 368         glTexCoord2f ((GLfloat) g_iWidth, (GLfloat) g_iHeight);
 369         glVertex3f (1.0f, -1.0f, -1.0f);
 370         glTexCoord2f (0.0f, (GLfloat) g_iHeight);
 371         glVertex3f (1.0f, -1.0f, 1.0f);
 372
 373         glNormal3f (0.0f, 1.0f, 0.0f);
 374         glTexCoord2f (0.0f, (GLfloat) g_iHeight);
 375         glVertex3f (1.0f, 1.0f, 1.0f);
 376         glTexCoord2f (0.0f, 0.0f);
 377         glVertex3f (1.0f, 1.0f, -1.0f);
 378         glTexCoord2f ((GLfloat) g_iWidth, 0.0f);
 379         glVertex3f (-1.0f, 1.0f, -1.0f);
 380         glTexCoord2f ((GLfloat) g_iWidth, (GLfloat) g_iHeight);
 381         glVertex3f (-1.0f, 1.0f, 1.0f);
 382         glEnd ();
 383
 384         glBindTexture (GL_TEXTURE_RECTANGLE_ARB, g_auiColorBuffer[1]);
 385         glBegin (GL_QUADS);
 386         glNormal3f (0.0f, 0.0f, 1.0f);
 387         glTexCoord2f (0.0f, 0.0f);
 388         glVertex3f (1.0f, 1.0f, 1.0f);
 389         glTexCoord2f ((GLfloat) g_iWidth, 0.0f);
 390         glVertex3f (-1.0f, 1.0f, 1.0f);
 391         glTexCoord2f ((GLfloat) g_iWidth, (GLfloat) g_iHeight);
 392         glVertex3f (-1.0f, -1.0f, 1.0f);
 393         glTexCoord2f (0.0f, (GLfloat) g_iHeight);
 394         glVertex3f (1.0f, -1.0f, 1.0f);
 395
 396         glNormal3f (0.0f, -1.0f, 0.0f);
 397         glTexCoord2f (0.0f, 0.0f);
 398         glVertex3f (1.0f, -1.0f, 1.0f);
 399         glTexCoord2f ((GLfloat) g_iWidth, 0.0f);
 400         glVertex3f (1.0f, -1.0f, -1.0f);
 401         glTexCoord2f ((GLfloat) g_iWidth, (GLfloat) g_iHeight);
 402         glVertex3f (-1.0f, -1.0f, -1.0f);
 403         glTexCoord2f (0.0f, (GLfloat) g_iHeight);
 404         glVertex3f (-1.0f, -1.0f, 1.0f);
 405         glEnd ();
 406
 407         glBindTexture (GL_TEXTURE_RECTANGLE_ARB, g_auiColorBuffer[2]);
 408         glBegin (GL_QUADS);
 409         glNormal3f (-1.0f, 0.0f, 0.0f);
 410         glTexCoord2f (0.0f, 0.0f);
 411         glVertex3f (-1.0f, 1.0f, 1.0f);
 412         glTexCoord2f ((GLfloat) g_iWidth, 0.0f);
 413         glVertex3f (-1.0f, 1.0f, -1.0f);
 414         glTexCoord2f ((GLfloat) g_iWidth, (GLfloat) g_iHeight);
 415         glVertex3f (-1.0f, -1.0f, -1.0f);
 416         glTexCoord2f (0.0f, (GLfloat) g_iHeight);
 417         glVertex3f (-1.0f, -1.0f, 1.0f);
 418
 419         glNormal3f (0.0f, 0.0f, -1.0f);
 420         glTexCoord2f (0.0f, (GLfloat) g_iHeight);
 421         glVertex3f (1.0f, 1.0f, -1.0f);
 422         glTexCoord2f (0.0f, 0.0f);
 423         glVertex3f (-1.0f, 1.0f, -1.0f);
 424         glTexCoord2f ((GLfloat) g_iWidth, 0.0f);
 425         glVertex3f (-1.0f, -1.0f, -1.0f);
 426         glTexCoord2f ((GLfloat) g_iWidth, (GLfloat) g_iHeight);
 427         glVertex3f (1.0f, -1.0f, -1.0f);
 428         glEnd ();
 429
 430         glPopMatrix ();
 431
 432         if (gdk_gl_drawable_is_double_buffered (pGlDrawable))
 433                 gdk_gl_drawable_swap_buffers (pGlDrawable);
 434         else
 435                 glFlush ();
 436
 437         /* end drawing to current GL-context */
 438         gdk_gl_drawable_gl_end (pGlDrawable);
 439
 440         fCurrentTimeStamp = g_timer_elapsed (g_pTimerId, &g_ulMilliSeconds);
 441         g_ulMilliSeconds /= 1000;
 442         fFrameTimeDelta = fCurrentTimeStamp - fLastTimeStamp;
 443         fFullSecond = fCurrentTimeStamp - fLastFullSecond;
 444
 445         if (fFullSecond < 1.0f)
 446                 iFrames++;
 447         else
 448         {
 449                 g_print ("fps: %d, last frame-time: %f\n",
 450                          iFrames,
 451                          fFrameTimeDelta);
 452                 iFrames = 0;
 453                 fLastFullSecond = fCurrentTimeStamp;
 454         }
 455
 456         fLastTimeStamp = fCurrentTimeStamp;
 457
 458         return TRUE;
 459 }
 460
 461 gboolean
 462 key_press_handler (GtkWidget*   pWidget,
 463                    GdkEventKey* pEvent,
 464                    GMainLoop*   pLoop)
 465 {
 466         if (pEvent->type == GDK_KEY_PRESS)
 467         {
 468                 switch (pEvent->keyval)
 469                 {
 470                         case GDK_q :
 471                         case GDK_Escape :
 472                                 delete_handler (pWidget, NULL, NULL);
 473                         break;
 474
 475                         case GDK_Page_Up :
 476                                 if (g_fAlpha < 1.0f)
 477                                         g_fAlpha += 0.05;
 478                         break;
 479
 480                         case GDK_Page_Down :
 481                                 if (g_fAlpha > 0.0f)
 482                                         g_fAlpha -= 0.05;
 483                         break;
 484
 485                         default :
 486                         break;
 487                 }
 488         }
 489
 490         return TRUE;
 491 }
 492
 493 gboolean
 494 draw_handler (GtkWidget* pWidget)
 495 {
 496         gtk_widget_queue_draw (pWidget);
 497
 498         return TRUE;
 499 }
 500