Added some example progs using DirectFBGL.

1 files changed, 480 insertions, 0 deletions

diff --git a/progs/directfb/df_gears.c b/progs/directfb/df_gears.c
new file mode 100644
index 0000000000..27df900115
--- /dev/null
+++ b/progs/directfb/df_gears.c
@@ -0,0 +1,480 @@
+/*
+   (c) Copyright 2001  convergence integrated media GmbH.
+   All rights reserved.
+
+   Written by Denis Oliver Kropp <dok@convergence.de> and
+              Andreas Hundt <andi@convergence.de>.
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, write to the
+   Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+
+#include <directfb.h>
+
+#include <GL/gl.h>
+#include <GL/directfbgl.h>
+
+
+/* the super interface */
+IDirectFB *dfb;
+
+/* the primary surface (surface of primary layer) */
+IDirectFBSurface *primary;
+
+/* the GL context */
+IDirectFBGL *primary_gl;
+
+/* our font */
+IDirectFBFont *font;
+
+/* event buffer */
+IDirectFBEventBuffer *events;
+
+/* macro for a safe call to DirectFB functions */
+#define DFBCHECK(x...) \
+        {                                                                      \
+           err = x;                                                            \
+           if (err != DFB_OK) {                                                \
+              fprintf( stderr, "%s <%d>:\n\t", __FILE__, __LINE__ );           \
+              DirectFBErrorFatal( #x, err );                                   \
+           }                                                                   \
+        }
+
+static int screen_width, screen_height;
+
+static unsigned long T0 = 0;
+static GLint Frames = 0;
+static GLfloat fps = 0;
+
+static inline unsigned long get_millis()
+{
+  struct timeval tv;
+
+  gettimeofday (&tv, NULL);
+  return (tv.tv_sec * 1000 + tv.tv_usec / 1000);
+}
+
+
+#ifndef M_PI
+#define M_PI 3.14159265
+#endif
+
+/**
+
+  Draw a gear wheel.  You'll probably want to call this function when
+  building a display list since we do a lot of trig here.
+
+  Input:  inner_radius - radius of hole at center
+          outer_radius - radius at center of teeth
+          width - width of gear
+          teeth - number of teeth
+          tooth_depth - depth of tooth
+
+ **/
+
+static void
+gear(GLfloat inner_radius, GLfloat outer_radius, GLfloat width,
+  GLint teeth, GLfloat tooth_depth)
+{
+  GLint i;
+  GLfloat r0, r1, r2;
+  GLfloat angle, da;
+  GLfloat u, v, len;
+
+  r0 = inner_radius;
+  r1 = outer_radius - tooth_depth / 2.0;
+  r2 = outer_radius + tooth_depth / 2.0;
+
+  da = 2.0 * M_PI / teeth / 4.0;
+
+  glShadeModel(GL_FLAT);
+
+  glNormal3f(0.0, 0.0, 1.0);
+
+  /* draw front face */
+  glBegin(GL_QUAD_STRIP);
+  for (i = 0; i <= teeth; i++) {
+    angle = i * 2.0 * M_PI / teeth;
+    glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
+    glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
+    if (i < teeth) {
+      glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
+      glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5);
+    }
+  }
+  glEnd();
+
+  /* draw front sides of teeth */
+  glBegin(GL_QUADS);
+  da = 2.0 * M_PI / teeth / 4.0;
+  for (i = 0; i < teeth; i++) {
+    angle = i * 2.0 * M_PI / teeth;
+
+    glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
+    glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
+    glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), width * 0.5);
+    glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5);
+  }
+  glEnd();
+
+  glNormal3f(0.0, 0.0, -1.0);
+
+  /* draw back face */
+  glBegin(GL_QUAD_STRIP);
+  for (i = 0; i <= teeth; i++) {
+    angle = i * 2.0 * M_PI / teeth;
+    glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
+    glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
+    if (i < teeth) {
+      glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5);
+      glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
+    }
+  }
+  glEnd();
+
+  /* draw back sides of teeth */
+  glBegin(GL_QUADS);
+  da = 2.0 * M_PI / teeth / 4.0;
+  for (i = 0; i < teeth; i++) {
+    angle = i * 2.0 * M_PI / teeth;
+
+    glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5);
+    glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), -width * 0.5);
+    glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
+    glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
+  }
+  glEnd();
+
+  /* draw outward faces of teeth */
+  glBegin(GL_QUAD_STRIP);
+  for (i = 0; i < teeth; i++) {
+    angle = i * 2.0 * M_PI / teeth;
+
+    glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
+    glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
+    u = r2 * cos(angle + da) - r1 * cos(angle);
+    v = r2 * sin(angle + da) - r1 * sin(angle);
+    len = sqrt(u * u + v * v);
+    u /= len;
+    v /= len;
+    glNormal3f(v, -u, 0.0);
+    glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
+    glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
+    glNormal3f(cos(angle), sin(angle), 0.0);
+    glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), width * 0.5);
+    glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), -width * 0.5);
+    u = r1 * cos(angle + 3 * da) - r2 * cos(angle + 2 * da);
+    v = r1 * sin(angle + 3 * da) - r2 * sin(angle + 2 * da);
+    glNormal3f(v, -u, 0.0);
+    glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5);
+    glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5);
+    glNormal3f(cos(angle), sin(angle), 0.0);
+  }
+
+  glVertex3f(r1 * cos(0), r1 * sin(0), width * 0.5);
+  glVertex3f(r1 * cos(0), r1 * sin(0), -width * 0.5);
+
+  glEnd();
+
+  glShadeModel(GL_SMOOTH);
+
+  /* draw inside radius cylinder */
+  glBegin(GL_QUAD_STRIP);
+  for (i = 0; i <= teeth; i++) {
+    angle = i * 2.0 * M_PI / teeth;
+    glNormal3f(-cos(angle), -sin(angle), 0.0);
+    glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
+    glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
+  }
+  glEnd();
+
+}
+
+static GLfloat view_rotx = 20.0, view_roty = 30.0, view_rotz = 0.0;
+static GLfloat inc_rotx = 0, inc_roty = 0, inc_rotz = 0;
+static GLint gear1, gear2, gear3;
+static GLfloat angle = 0.0;
+
+static void
+draw(void)
+{
+  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+  glPushMatrix();
+    glRotatef(view_rotx, 1.0, 0.0, 0.0);
+    glRotatef(view_roty, 0.0, 1.0, 0.0);
+    glRotatef(view_rotz, 0.0, 0.0, 1.0);
+
+    glPushMatrix();
+      glTranslatef(-3.0, -2.0, 0.0);
+      glRotatef(angle, 0.0, 0.0, 1.0);
+      glCallList(gear1);
+    glPopMatrix();
+
+    glPushMatrix();
+      glTranslatef(3.1, -2.0, 0.0);
+      glRotatef(-2.0 * angle - 9.0, 0.0, 0.0, 1.0);
+      glCallList(gear2);
+    glPopMatrix();
+
+    glPushMatrix();
+      glTranslatef(-3.1, 4.2, 0.0);
+      glRotatef(-2.0 * angle - 25.0, 0.0, 0.0, 1.0);
+      glCallList(gear3);
+    glPopMatrix();
+
+  glPopMatrix();
+}
+
+/* new window size or exposure */
+static void
+reshape(int width, int height)
+{
+  GLfloat h = (GLfloat) height / (GLfloat) width;
+
+  glViewport(0, 0, (GLint) width, (GLint) height);
+  glMatrixMode(GL_PROJECTION);
+  glLoadIdentity();
+  glFrustum(-1.0, 1.0, -h, h, 5.0, 60.0);
+  glMatrixMode(GL_MODELVIEW);
+  glLoadIdentity();
+  glTranslatef(0.0, 0.0, -40.0);
+}
+
+static void
+init(int argc, char *argv[])
+{
+  static GLfloat pos[4] = {5.0, 5.0, 10.0, 0.0};
+  static GLfloat red[4] = {0.8, 0.1, 0.0, 1.0};
+  static GLfloat green[4] = {0.0, 0.8, 0.2, 1.0};
+  static GLfloat blue[4] = {0.2, 0.2, 1.0, 1.0};
+  GLint i;
+
+  glLightfv(GL_LIGHT0, GL_POSITION, pos);
+  glEnable(GL_CULL_FACE);
+  glEnable(GL_LIGHTING);
+  glEnable(GL_LIGHT0);
+  glEnable(GL_DEPTH_TEST);
+
+  /* make the gears */
+  gear1 = glGenLists(1);
+  glNewList(gear1, GL_COMPILE);
+  glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red);
+  gear(1.0, 4.0, 1.0, 20, 0.7);
+  glEndList();
+
+  gear2 = glGenLists(1);
+  glNewList(gear2, GL_COMPILE);
+  glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green);
+  gear(0.5, 2.0, 2.0, 10, 0.7);
+  glEndList();
+
+  gear3 = glGenLists(1);
+  glNewList(gear3, GL_COMPILE);
+  glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue);
+  gear(1.3, 2.0, 0.5, 10, 0.7);
+  glEndList();
+
+  glEnable(GL_NORMALIZE);
+
+  for ( i=1; i<argc; i++ ) {
+    if (strcmp(argv[i], "-info")==0) {
+      printf("GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
+      printf("GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
+      printf("GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
+      printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
+    }
+  }
+}
+
+int main( int argc, char *argv[] )
+{
+     int quit = 0;
+     DFBResult err;
+     DFBSurfaceDescription dsc;
+
+     DFBCHECK(DirectFBInit( &argc, &argv ));
+
+     /* create the super interface */
+     DFBCHECK(DirectFBCreate( &dfb ));
+
+     /* create an event buffer for all devices with these caps */
+     DFBCHECK(dfb->CreateInputEventBuffer( dfb, DICAPS_KEYS | DICAPS_AXES,
+                                           DFB_FALSE, &events ));
+
+     /* set our cooperative level to DFSCL_FULLSCREEN
+        for exclusive access to the primary layer */
+     dfb->SetCooperativeLevel( dfb, DFSCL_FULLSCREEN );
+
+     /* get the primary surface, i.e. the surface of the
+        primary layer we have exclusive access to */
+     dsc.flags = DSDESC_CAPS;
+     dsc.caps  = DSCAPS_PRIMARY | DSCAPS_DOUBLE;
+
+     DFBCHECK(dfb->CreateSurface( dfb, &dsc, &primary ));
+
+     /* get the size of the surface and fill it */
+     DFBCHECK(primary->GetSize( primary, &screen_width, &screen_height ));
+     DFBCHECK(primary->FillRectangle( primary, 0, 0,
+                                      screen_width, screen_height ));
+     primary->Flip( primary, NULL, 0 );
+
+     /* create the default font and set it */
+     DFBCHECK(dfb->CreateFont( dfb, NULL, NULL, &font ));
+     DFBCHECK(primary->SetFont( primary, font ));
+
+     /* get the GL context */
+     DFBCHECK(primary->GetGL( primary, &primary_gl ));
+
+     DFBCHECK(primary_gl->Lock( primary_gl ));
+     
+     init(argc, argv);
+     reshape(screen_width, screen_height);
+
+     DFBCHECK(primary_gl->Unlock( primary_gl ));
+     
+     T0 = get_millis();
+
+     while (!quit) {
+          DFBInputEvent evt;
+          unsigned long t;
+
+          DFBCHECK(primary_gl->Lock( primary_gl ));
+
+          draw();
+          
+          DFBCHECK(primary_gl->Unlock( primary_gl ));
+
+          if (fps) {
+               char buf[64];
+
+               snprintf(buf, 64, "%4.1f FPS\n", fps);
+
+               primary->SetColor( primary, 0xff, 0, 0, 0xff );
+               primary->DrawString( primary, buf, -1, screen_width - 5, 5, DSTF_TOPRIGHT );
+          }
+          
+          primary->Flip( primary, NULL, 0 );
+          Frames++;
+
+
+          t = get_millis();
+          if (t - T0 >= 2000) {
+               GLfloat seconds = (t - T0) / 1000.0;
+
+               fps = Frames / seconds;
+
+               T0 = t;
+               Frames = 0;
+          }
+
+
+          while (events->GetEvent( events, DFB_EVENT(&evt) ) == DFB_OK) {
+               switch (evt.type) {
+                    case DIET_KEYPRESS:
+                         switch (evt.key_symbol) {
+                              case DIKS_ESCAPE:
+                                   quit = 1;
+                                   break;
+                              case DIKS_CURSOR_UP:
+                                   inc_rotx = 5.0;
+                                   break;
+                              case DIKS_CURSOR_DOWN:
+                                   inc_rotx = -5.0;
+                                   break;
+                              case DIKS_CURSOR_LEFT:
+                                   inc_roty = 5.0;
+                                   break;
+                              case DIKS_CURSOR_RIGHT:
+                                   inc_roty = -5.0;
+                                   break;
+                              case DIKS_PAGE_UP:
+                                   inc_rotz = 5.0;
+                                   break;
+                              case DIKS_PAGE_DOWN:
+                                   inc_rotz = -5.0;
+                                   break;
+                              default:
+                                   ;
+                         }
+                         break;
+                    case DIET_KEYRELEASE:
+                         switch (evt.key_symbol) {
+                              case DIKS_CURSOR_UP:
+                                   inc_rotx = 0;
+                                   break;
+                              case DIKS_CURSOR_DOWN:
+                                   inc_rotx = 0;
+                                   break;
+                              case DIKS_CURSOR_LEFT:
+                                   inc_roty = 0;
+                                   break;
+                              case DIKS_CURSOR_RIGHT:
+                                   inc_roty = 0;
+                                   break;
+                              case DIKS_PAGE_UP:
+                                   inc_rotz = 0;
+                                   break;
+                              case DIKS_PAGE_DOWN:
+                                   inc_rotz = 0;
+                                   break;
+                              default:
+                                   ;
+                         }
+                         break;
+                    case DIET_AXISMOTION:
+                         if (evt.flags & DIEF_AXISREL) {
+                              switch (evt.axis) {
+                                   case DIAI_X:
+                                        view_roty += evt.axisrel / 2.0;
+                                        break;
+                                   case DIAI_Y:
+                                        view_rotx += evt.axisrel / 2.0;
+                                        break;
+                                   case DIAI_Z:
+                                        view_rotz += evt.axisrel / 2.0;
+                                        break;
+                                   default:
+                                        ;
+                              }
+                         }
+                         break;
+                    default:
+                         ;
+               }
+          }
+
+          angle += 2.0;
+
+          view_rotx += inc_rotx;
+          view_roty += inc_roty;
+          view_rotz += inc_rotz;
+     }
+
+     /* release our interfaces to shutdown DirectFB */
+     primary_gl->Release( primary_gl );
+     primary->Release( primary );
+     font->Release( font );
+     events->Release( events );
+     dfb->Release( dfb );
+
+     return 0;
+}
+