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, July 2006, 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 now.\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, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
 193         glTexParameteri (GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 194
 195         glMatrixMode (GL_MODELVIEW);
 196         glLoadIdentity ();
 197         gluLookAt (0.0f, 0.0f, Z_NEAR,
 198                            0.0f, 0.0f, 0.0f,
 199                            0.0f, 1.0f, 0.0f);
 200         glTranslatef (0.0f, 0.0f, -Z_NEAR);
 201
 202         /* end drawing to current GL-context */
 203         gdk_gl_drawable_gl_end (pGlDrawable);
 204 }
 205
 206 gboolean
 207 configure_handler (GtkWidget* pWidget,
 208                                    GdkEventConfigure* pEvent,
 209                                    gpointer data)
 210 {
 211         GdkGLContext* pGlContext = gtk_widget_get_gl_context (pWidget);
 212         GdkGLDrawable* pGlDrawable = gtk_widget_get_gl_drawable (pWidget);
 213         GLsizei w = pWidget->allocation.width;
 214         GLsizei h = pWidget->allocation.height;
 215
 216         /* make GL-context "current" */
 217         if (!gdk_gl_drawable_gl_begin (pGlDrawable, pGlContext))
 218                 return FALSE;
 219
 220         glViewport (0, 0, w, h);
 221         glMatrixMode (GL_PROJECTION);
 222         glLoadIdentity ();
 223         gluPerspective (2.0f * FOVY_2, (GLfloat) w / (GLfloat) h, 0.1f, 50.0f);
 224
 225         glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 226
 227         glGenTextures (3, g_auiColorBuffer);
 228         glBindTexture (GL_TEXTURE_RECTANGLE_ARB, g_auiColorBuffer[0]);
 229         glTexImage2D (GL_TEXTURE_RECTANGLE_ARB,
 230                                   0,
 231                                   GL_RGBA,
 232                                   g_iWidth,
 233                                   g_iHeight,
 234                                   0,
 235                                   GL_BGRA,
 236                                   GL_UNSIGNED_BYTE,
 237                                   NULL);
 238
 239         glBindTexture (GL_TEXTURE_RECTANGLE_ARB, g_auiColorBuffer[1]);
 240         glTexImage2D (GL_TEXTURE_RECTANGLE_ARB,
 241                                   0,
 242                                   GL_RGBA,
 243                                   g_iWidth,
 244                                   g_iHeight,
 245                                   0,
 246                                   GL_BGRA,
 247                                   GL_UNSIGNED_BYTE,
 248                                   NULL);
 249
 250         glBindTexture (GL_TEXTURE_RECTANGLE_ARB, g_auiColorBuffer[2]);
 251         glTexImage2D (GL_TEXTURE_RECTANGLE_ARB,
 252                                   0,
 253                                   GL_RGBA,
 254                                   g_iWidth,
 255                                   g_iHeight,
 256                                   0,
 257                                   GL_BGRA,
 258                                   GL_UNSIGNED_BYTE,
 259                                   NULL);
 260
 261         /* end drawing to current GL-context */
 262         gdk_gl_drawable_gl_end (pGlDrawable);
 263
 264         return TRUE;
 265 }
 266
 267 gboolean
 268 expose_handler (GtkWidget* pWidget,
 269                                 GdkEventExpose* pEvent,
 270                                 gpointer data)
 271 {
 272         GdkGLContext* pGlContext = gtk_widget_get_gl_context (pWidget);
 273         GdkGLDrawable* pGlDrawable = gtk_widget_get_gl_drawable (pWidget);
 274         static gint iFrames = 0;
 275         static gdouble fLastTimeStamp = 0.0f;;
 276         static gdouble fCurrentTimeStamp = 0.0f;;
 277         static gdouble fLastFullSecond = 0.0f;;
 278         gdouble fFrameTimeDelta = 0.0f;
 279         gdouble fFullSecond = 0.0f;
 280         GLfloat afVector[3];
 281         GLfloat afMatrixBase[16];
 282         GLfloat afFrontDiffuseMat[] = {1.0f * g_fAlpha, 1.0f * g_fAlpha, 1.0f * g_fAlpha, 1.0f * g_fAlpha};
 283         GLfloat afBackDiffuseMat[] = {1.0f * g_fAlpha, 1.0f * g_fAlpha, 1.0f * g_fAlpha, 1.0f * g_fAlpha};
 284
 285         /* make GL-context "current" */
 286         if (!gdk_gl_drawable_gl_begin (pGlDrawable, pGlContext))
 287                 return FALSE;
 288
 289         glPushMatrix ();
 290         glTranslatef (0.0f, 0.0f, 0.5f);
 291         glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 292         glGetFloatv (GL_MODELVIEW_MATRIX, afMatrixBase);
 293         afVector[0] = afMatrixBase[0];
 294         afVector[1] = afMatrixBase[4];
 295         afVector[2] = afMatrixBase[8];
 296         glRotatef (g_afAngle[1] * 0.5f, afVector[0], afVector[1], afVector[2]);
 297         afVector[0] = afMatrixBase[1];
 298         afVector[1] = afMatrixBase[5];
 299         afVector[2] = afMatrixBase[9];
 300         glRotatef (g_afAngle[0] * 0.5f, afVector[0], afVector[1], afVector[2]);
 301         glScalef (g_fScale, g_fScale, g_fScale);
 302
 303         glMaterialfv (GL_FRONT, GL_DIFFUSE, afFrontDiffuseMat);
 304         glMaterialfv (GL_BACK, GL_DIFFUSE, afBackDiffuseMat);
 305
 306         render_zini (g_pCairoContext[0], g_iWidth, g_iHeight);
 307         advance (&g_lineOne.start);
 308         advance (&g_lineOne.end);
 309         advance (&g_lineTwo.start);
 310         advance (&g_lineTwo.end);
 311         render_curve (g_pCairoContext[1], g_iWidth, g_iHeight, &g_lineOne, &g_lineTwo);
 312         render_flower (g_pCairoContext[2], g_iWidth, g_iHeight);
 313
 314         glBindTexture (GL_TEXTURE_RECTANGLE_ARB, g_auiColorBuffer[0]);
 315         glTexImage2D (GL_TEXTURE_RECTANGLE_ARB,
 316                                   0,
 317                                   GL_RGBA,
 318                                   g_iWidth,
 319                                   g_iHeight,
 320                                   0,
 321                                   GL_BGRA,
 322                                   GL_UNSIGNED_BYTE,
 323                                   g_pucSurfaceData[0]);
 324
 325         glBindTexture (GL_TEXTURE_RECTANGLE_ARB, g_auiColorBuffer[1]);
 326         glTexImage2D (GL_TEXTURE_RECTANGLE_ARB,
 327                                   0,
 328                                   GL_RGBA,
 329                                   g_iWidth,
 330                                   g_iHeight,
 331                                   0,
 332                                   GL_BGRA,
 333                                   GL_UNSIGNED_BYTE,
 334                                   g_pucSurfaceData[1]);
 335
 336         glBindTexture (GL_TEXTURE_RECTANGLE_ARB, g_auiColorBuffer[2]);
 337         glTexImage2D (GL_TEXTURE_RECTANGLE_ARB,
 338                                   0,
 339                                   GL_RGBA,
 340                                   g_iWidth,
 341                                   g_iHeight,
 342                                   0,
 343                                   GL_BGRA,
 344                                   GL_UNSIGNED_BYTE,
 345                                   g_pucSurfaceData[2]);
 346
 347         glBindTexture (GL_TEXTURE_RECTANGLE_ARB, g_auiColorBuffer[0]);
 348         glBegin (GL_QUADS);
 349         glNormal3f (1.0f, 0.0f, 0.0f);
 350         glTexCoord2f (0.0f, 0.0f);
 351         glVertex3f (1.0f, 1.0f, 1.0f);
 352         glTexCoord2f ((GLfloat) g_iWidth, 0.0f);
 353         glVertex3f (1.0f, 1.0f, -1.0f);
 354         glTexCoord2f ((GLfloat) g_iWidth, (GLfloat) g_iHeight);
 355         glVertex3f (1.0f, -1.0f, -1.0f);
 356         glTexCoord2f (0.0f, (GLfloat) g_iHeight);
 357         glVertex3f (1.0f, -1.0f, 1.0f);
 358
 359         glNormal3f (0.0f, 1.0f, 0.0f);
 360         glTexCoord2f (0.0f, (GLfloat) g_iHeight);
 361         glVertex3f (1.0f, 1.0f, 1.0f);
 362         glTexCoord2f (0.0f, 0.0f);
 363         glVertex3f (1.0f, 1.0f, -1.0f);
 364         glTexCoord2f ((GLfloat) g_iWidth, 0.0f);
 365         glVertex3f (-1.0f, 1.0f, -1.0f);
 366         glTexCoord2f ((GLfloat) g_iWidth, (GLfloat) g_iHeight);
 367         glVertex3f (-1.0f, 1.0f, 1.0f);
 368         glEnd ();
 369
 370         glBindTexture (GL_TEXTURE_RECTANGLE_ARB, g_auiColorBuffer[1]);
 371         glBegin (GL_QUADS);
 372         glNormal3f (0.0f, 0.0f, 1.0f);
 373         glTexCoord2f (0.0f, 0.0f);
 374         glVertex3f (1.0f, 1.0f, 1.0f);
 375         glTexCoord2f ((GLfloat) g_iWidth, 0.0f);
 376         glVertex3f (-1.0f, 1.0f, 1.0f);
 377         glTexCoord2f ((GLfloat) g_iWidth, (GLfloat) g_iHeight);
 378         glVertex3f (-1.0f, -1.0f, 1.0f);
 379         glTexCoord2f (0.0f, (GLfloat) g_iHeight);
 380         glVertex3f (1.0f, -1.0f, 1.0f);
 381
 382         glNormal3f (0.0f, -1.0f, 0.0f);
 383         glTexCoord2f (0.0f, 0.0f);
 384         glVertex3f (1.0f, -1.0f, 1.0f);
 385         glTexCoord2f ((GLfloat) g_iWidth, 0.0f);
 386         glVertex3f (1.0f, -1.0f, -1.0f);
 387         glTexCoord2f ((GLfloat) g_iWidth, (GLfloat) g_iHeight);
 388         glVertex3f (-1.0f, -1.0f, -1.0f);
 389         glTexCoord2f (0.0f, (GLfloat) g_iHeight);
 390         glVertex3f (-1.0f, -1.0f, 1.0f);
 391         glEnd ();
 392
 393         glBindTexture (GL_TEXTURE_RECTANGLE_ARB, g_auiColorBuffer[2]);
 394         glBegin (GL_QUADS);
 395         glNormal3f (-1.0f, 0.0f, 0.0f);
 396         glTexCoord2f (0.0f, 0.0f);
 397         glVertex3f (-1.0f, 1.0f, 1.0f);
 398         glTexCoord2f ((GLfloat) g_iWidth, 0.0f);
 399         glVertex3f (-1.0f, 1.0f, -1.0f);
 400         glTexCoord2f ((GLfloat) g_iWidth, (GLfloat) g_iHeight);
 401         glVertex3f (-1.0f, -1.0f, -1.0f);
 402         glTexCoord2f (0.0f, (GLfloat) g_iHeight);
 403         glVertex3f (-1.0f, -1.0f, 1.0f);
 404
 405         glNormal3f (0.0f, 0.0f, -1.0f);
 406         glTexCoord2f (0.0f, (GLfloat) g_iHeight);
 407         glVertex3f (1.0f, 1.0f, -1.0f);
 408         glTexCoord2f (0.0f, 0.0f);
 409         glVertex3f (-1.0f, 1.0f, -1.0f);
 410         glTexCoord2f ((GLfloat) g_iWidth, 0.0f);
 411         glVertex3f (-1.0f, -1.0f, -1.0f);
 412         glTexCoord2f ((GLfloat) g_iWidth, (GLfloat) g_iHeight);
 413         glVertex3f (1.0f, -1.0f, -1.0f);
 414         glEnd ();
 415
 416         glPopMatrix ();
 417
 418         if (gdk_gl_drawable_is_double_buffered (pGlDrawable))
 419                 gdk_gl_drawable_swap_buffers (pGlDrawable);
 420         else
 421                 glFlush ();
 422
 423         /* end drawing to current GL-context */
 424         gdk_gl_drawable_gl_end (pGlDrawable);
 425
 426         fCurrentTimeStamp = g_timer_elapsed (g_pTimerId, &g_ulMilliSeconds);
 427         g_ulMilliSeconds /= 1000;
 428         fFrameTimeDelta = fCurrentTimeStamp - fLastTimeStamp;
 429         fFullSecond = fCurrentTimeStamp - fLastFullSecond;
 430
 431         if (fFullSecond < 1.0f)
 432                 iFrames++;
 433         else
 434         {
 435                 g_print ("fps: %d, last frame-time: %f\n", iFrames, fFrameTimeDelta);
 436                 iFrames = 0;
 437                 fLastFullSecond = fCurrentTimeStamp;
 438         }
 439
 440         fLastTimeStamp = fCurrentTimeStamp;
 441
 442         return TRUE;
 443 }
 444
 445 gboolean
 446 key_press_handler (GtkWidget* pWidget,
 447                                    GdkEventKey* pEvent,
 448                                    GMainLoop* pLoop)
 449 {
 450         if (pEvent->type == GDK_KEY_PRESS)
 451         {
 452                 switch (pEvent->keyval)
 453                 {
 454                         case GDK_q :
 455                         case GDK_Escape :
 456                                 delete_handler (pWidget, NULL, NULL);
 457                         break;
 458
 459                         case GDK_Page_Up :
 460                                 if (g_fAlpha < 1.0f)
 461                                         g_fAlpha += 0.05;
 462                         break;
 463
 464                         case GDK_Page_Down :
 465                                 if (g_fAlpha > 0.0f)
 466                                         g_fAlpha -= 0.05;
 467                         break;
 468
 469                         default :
 470                         break;
 471                 }
 472         }
 473
 474         return TRUE;
 475 }
 476
 477 gboolean
 478 draw_handler (GtkWidget* pWidget)
 479 {
 480         gtk_widget_queue_draw (pWidget);
 481
 482         return TRUE;
 483 }