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[diderot] Diff of /examples/iso2d-demo/main.c
[diderot] / examples / iso2d-demo / main.c  
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Diff of /examples/iso2d-demo/main.c

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revision 1881, Fri May 18 21:57:06 2012 UTC revision 1882, Sat May 19 11:45:04 2012 UTC
# Line 11  Line 11 
11   */   */
12    
13  #include <AntTweakBar.h>  #include <AntTweakBar.h>
14  #if defined(__APPLE__)  #include "GL/glfw.h"
15  #   include <GLUT/glut.h>  #ifdef DIDEROT_CODE
 #else  
 #   include <GL/glut.h>  
 #endif  
16  #include "vr-lite-cam.h"  #include "vr-lite-cam.h"
17    #endif
18    #include "teem/nrrd.h"
19    #include "teem/biff.h"
20    
21  /* pixel dimensions of output */  /* pixel dimensions of output */
22  #define WIDTH   512  #define WIDTH   512
# Line 29  Line 29 
29  unsigned int    Height;         // view window height  unsigned int    Height;         // view window height
30  GLuint          ImageTexture;   // Texture ID of background image  GLuint          ImageTexture;   // Texture ID of background image
31    
32    typedef struct {
33        TwBar       *ctls;
34        unsigned int running;
35    } State_t;
36    
37  // Callback function called by GLUT to render screen  // Callback function called by GLUT to render screen
38  void Display(void)  void Draw ()
39  {  {
40    // Clear frame buffer    // Clear frame buffer
41      glClearColor (0, 0, 0, 1);      glClearColor (0, 0, 0, 1);
# Line 40  Line 45 
45      glDisable(GL_CULL_FACE);      glDisable(GL_CULL_FACE);
46    
47    // Draw background    // Draw background
48        float       halfWid = 0.5 * (float)Width;
49        float       halfHt = 0.5 * (float)Height;
50        glBindTexture (GL_TEXTURE_2D, ImageTexture);
51        glBegin (GL_QUADS);
52            glTexCoord2f (0.0, 0.0);
53            glVertex2f (-halfWid, -halfHt);
54            glTexCoord2f (1.0, 0.0);
55            glVertex2f (halfWid, -halfHt);
56            glTexCoord2f (1.0, 1.0);
57            glVertex2f (halfWid, halfHt);
58            glTexCoord2f (0.0, 1.0);
59            glVertex2f (-halfWid, halfHt);
60        glEnd();
61    
62    // Draw current render state    // Draw current render state
63    
# Line 47  Line 65 
65      TwDraw();      TwDraw();
66    
67    // Present frame buffer    // Present frame buffer
68      glutSwapBuffers();      glfwSwapBuffers();
69  }  }
70    
71  // Callback function called by GLUT when window size changes  // Callback function called by GLFW when window size changes
72  void Reshape (int width, int height)  void GLFWCALL WindowSizeCB (int width, int height)
73  {  {
74        double      halfWid = 0.5 * (double)width;
75        double      halfHt = 0.5 * (double)height;
76    
77    // Set OpenGL viewport and camera    // Set OpenGL viewport and camera
78      glViewport (0, 0, width, height);      glViewport (0, 0, width, height);
79      glMatrixMode (GL_PROJECTION);      glMatrixMode (GL_PROJECTION);
80      glLoadIdentity ();      glLoadIdentity ();
81      /* FIXME */      gluOrtho2D (-halfWid, halfWid, -halfHt, halfHt);
82    
83      glMatrixMode (GL_MODELVIEW);      glMatrixMode (GL_MODELVIEW);
84      glLoadIdentity ();      glLoadIdentity ();
85      /* FIXME */      gluLookAt (
86            0.0, 0.0, 1.0,
87            0.0, 0.0, 0.0,
88            0.0, 1.0, 0.0);
89    
90    // Send the new window size to AntTweakBar    // Send the new window size to AntTweakBar
91      TwWindowSize (width, height);      TwWindowSize (width, height);
# Line 100  Line 125 
125      glTexImage2D (GL_TEXTURE_2D,  /* or GL_TEXTURE_RECTANGLE ? */      glTexImage2D (GL_TEXTURE_2D,  /* or GL_TEXTURE_RECTANGLE ? */
126          0,          0,
127          GL_RED,          GL_RED,
128          nin->axis[0]->size, nin->axis[1]->size, 0,          nin->axis[0].size, nin->axis[1].size, 0,
129          GL_RED, type,          GL_RED, type,
130          nin->data);          nin->data);
131  /* check for error */  /* check for error */
# Line 108  Line 133 
133      ImageTexture = texId;      ImageTexture = texId;
134  }  }
135    
136    void TW_CALL StartButtonCB (void *data)
137    {
138        State_t *st = (State_t *)data;
139    
140        if (st->running == 0) {
141            st->running = 1;
142            TwSetParam (st->ctls, "StartButton", "label", TW_PARAM_CSTRING, 1, "Stop");
143        }
144        else {
145            st->running = 0;
146            TwSetParam (st->ctls, "StartButton", "label", TW_PARAM_CSTRING, 1, "Start");
147        }
148    }
149    
150  int main (int argc, const char **argv)  int main (int argc, const char **argv)
151  {  {
152    // Initialize GLUT      State_t     state = { .running = 0 };
153      glutInit (&argc, argv);  
154      glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);    // Initialize GLFW
155      glutInitWindowSize (WIDTH, HEIGHT);      if (0 == glfwInit()) {
156      glutCreateWindow ("Diderot Iso2D Animation");        // An error occured
157      glutCreateMenu (0);          fprintf(stderr, "GLFW initialization failed\n");
158            return 1;
159    // Set GLUT callbacks      }
160      glutDisplayFunc (Display);  
161      glutReshapeFunc (Reshape);      GLFWvidmode mode;
162      atexit (TwTerminate);  // Called after glutMainLoop ends      glfwGetDesktopMode (&mode);
163        if (0 == glfwOpenWindow(WIDTH, HEIGHT, mode.RedBits, mode.GreenBits, mode.BlueBits, 0, 0, 0, GLFW_WINDOW) ) {
164          // A fatal error occured
165            fprintf(stderr, "Cannot open GLFW window\n");
166            glfwTerminate();
167            return 1;
168        }
169        glfwEnable(GLFW_MOUSE_CURSOR);
170        glfwEnable(GLFW_KEY_REPEAT);
171        glfwSetWindowTitle("Diderot Iso2D Animation");
172    
173    // Initialize AntTweakBar    // Initialize AntTweakBar
174      TwInit (TW_OPENGL, 0);      TwInit (TW_OPENGL, 0);
175    
176    // Set GLUT event callbacks    // create a tweakbar
177    // - Directly redirect GLUT mouse button events to AntTweakBar      TwBar *tweakBar = TwNewBar("Controls");
178      glutMouseFunc ((GLUTmousebuttonfun)TwEventMouseButtonGLUT);      state.ctls = tweakBar;
179    // - Directly redirect GLUT mouse motion events to AntTweakBar      unsigned int NumSteps = 0;
180      glutMotionFunc ((GLUTmousemotionfun)TwEventMouseMotionGLUT);      TwAddVarRO (tweakBar, "NumSteps", TW_TYPE_UINT32, &NumSteps, " label='# of steps' ");
181    // - Directly redirect GLUT mouse "passive" motion events to AntTweakBar (same as MouseMotion)      TwAddButton (tweakBar, "StartButton", StartButtonCB, &state, " label='Start' ");
182      glutPassiveMotionFunc ((GLUTmousemotionfun)TwEventMouseMotionGLUT);  
183    // - Directly redirect GLUT key events to AntTweakBar    // Set GLFW event callbacks
184      glutKeyboardFunc ((GLUTkeyboardfun)TwEventKeyboardGLUT);      glfwSetWindowSizeCallback (WindowSizeCB);
185    // - Directly redirect GLUT special key events to AntTweakBar      glfwSetMouseButtonCallback ((GLFWmousebuttonfun)TwEventMouseButtonGLFW);  // redirect to AntTweakBar
186      glutSpecialFunc ((GLUTspecialfun)TwEventSpecialGLUT);      glfwSetMousePosCallback ((GLFWmouseposfun)TwEventMousePosGLFW);  // redirect to AntTweakBar
187    // - Send 'glutGetModifers' function pointer to AntTweakBar;      glfwSetMouseWheelCallback ((GLFWmousewheelfun)TwEventMouseWheelGLFW);  // redirect to AntTweakBar
188    //   required because the GLUT key event functions do not report key modifiers states.      glfwSetKeyCallback ((GLFWkeyfun)TwEventKeyGLFW);  // redirect to AntTweakBar
189      TwGLUTModifiersFunc (glutGetModifiers);      glfwSetCharCallback ((GLFWcharfun)TwEventCharGLFW);  // redirect to AntTweakBar
190    
191    // load Diderot image as nrrd file    // load Diderot image as nrrd file
192      Nrrd *Diderot = nrrdNew();      Diderot = nrrdNew();
193      if (nrrdLoad(diderot, "data/ddro-80.nrrd", 0) != 0) {      if (nrrdLoad(Diderot, "data/ddro-80.nrrd", 0) != 0) {
194          char *msg = biffGetDone(NRRD);          char *msg = biffGetDone(NRRD);
195          fprintf (stderr, "Error loading nrrd file: %s", msg);          fprintf (stderr, "Error loading nrrd file: %s", msg);
196          free (msg);          free (msg);
197          return 0;          return 0;
198      }      }
199    
200        InitTexture (Diderot);
201    
202      // Main loop (repeated while window is not closed and [ESC] is not pressed)
203        while (glfwGetWindowParam(GLFW_OPENED) && !glfwGetKey(GLFW_KEY_ESC)) {
204            Draw();
205        }
206    
207    #ifdef DIDEROT_CODE
208      ISO_World_t *wrld = ISO_Init ();      ISO_World_t *wrld = ISO_Init ();
209    
210      ISO_Initially (wrld);      ISO_Initially (wrld);
# Line 170  Line 226 
226      }      }
227    
228      ISO_Shutdown (wrld);      ISO_Shutdown (wrld);
229    #endif
230    
231      // Terminate AntTweakBar and GLFW
232        TwTerminate();
233        glfwTerminate();
234    
235      return 0;      return 0;
236  }  }
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