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

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revision 2078, Mon Nov 5 12:00:48 2012 UTC revision 2079, Mon Nov 5 12:50:51 2012 UTC
# Line 14  Line 14 
14  #include "util.h"  #include "util.h"
15  #include "vr.h"  #include "vr.h"
16  #include <unistd.h>  #include <unistd.h>
17    #include "teem/air.h"
18    
19  /* minimum and maximum values from */  /* minimum and maximum values from */
20  #define MIN_VALUE       0  #define MIN_VALUE       0
# Line 25  Line 26 
26  #define MIN_OPAC_MID    ((float)(MIN_VALUE+OPAC_HALF_WID))  #define MIN_OPAC_MID    ((float)(MIN_VALUE+OPAC_HALF_WID))
27  #define MAX_OPAC_MID    ((float)(MAX_VALUE-OPAC_HALF_WID))  #define MAX_OPAC_MID    ((float)(MAX_VALUE-OPAC_HALF_WID))
28    
29  #define OPAC_DELTA      100  #define OPAC_DELTA      25
30    
31  /* pixel dimensions of output */  /* reduced-size inputs */
32  #define WIDTH   480  #define REDUCED_WID     256
33  #define HEIGHT  345  #define REDUCED_HT      184
34    #define REDUCED_STEP    1
35  /* world bounds */  
36  #define WRLD_MIN_X      0.0  
37  #define WRLD_MIN_Y      0.0  /* full-size inputs */
38  #define WRLD_MAX_X      1.0  #define FULL_WID        512
39  #define WRLD_MAX_Y      1.0  #define FULL_HT         368
40  #define WRLD_CENTER_X   0.5  #define FULL_STEP       0.5
41  #define WRLD_CENTER_Y   0.5  
42    #define WIDTH   (2*FULL_WID)
43    #define HEIGHT  (2*FULL_HT)
44    
45  static inline void CheckError ()  static inline void CheckError ()
46  {  {
# Line 50  Line 53 
53    
54  /***** Globals for viewing, etc. *****/  /***** Globals for viewing, etc. *****/
55    
56    typedef struct {
57        bool        init;
58        GLuint      wid;
59        GLuint      ht;
60        GLuint      id;
61    } TexInfo_t;
62    
63  VR_World_t      *World;  VR_World_t      *World;
64  unsigned int    Width;          // view window width  unsigned int    Width;          // view window width
65  unsigned int    Height;         // view window height  unsigned int    Height;         // view window height
66    TexInfo_t       ReducedTexure = {       // Texture ID of reduced image
67            false, REDUCED_WID, REDUCED_HT, 0
68        };
69    TexInfo_t       FullTexture = {         // Texture ID of full image
70            false, FULL_WID, FULL_HT, 0
71        };
72  bool            NeedsRedraw;  bool            NeedsRedraw;
73  bool            NeedsRecompute;  bool            NeedsRecompute;
74  float           OpacMid = 550.0;  float           OpacMid = 550.0;
75    int             Dir = 0;                /* -1, 0, 1 */
76    
77    
78    // initialize a texture from a grayscale Nrrd file
79    void InitTexture (TexInfo_t *txt, Nrrd *img)
80    {
81        if (! txt->init) {
82          // generate the TeXID
83            glGenTextures (1, &(txt->id));
84    
85          // load the texture data
86            glBindTexture (GL_TEXTURE_2D, txt->id);
87            glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA, txt->wid, txt->ht, 0, GL_RGBA, GL_FLOAT, img->data);
88            CheckError();
89            glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
90            glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
91            CheckError();
92        }
93        else {
94          // reload the texture data
95            glBindTexture (GL_TEXTURE_2D, txt->id);
96            glTexSubImage2D (GL_TEXTURE_2D, 0, 0, 0, txt->wid, txt->ht, GL_RGBA, GL_FLOAT, img->data);
97            CheckError();
98        }
99    }
100    
101  // Callback function called by GLUT to render screen  // Callback function called by GLUT to render screen
102  void Draw (Nrrd *img)  void Draw (GLuint txtId)
103  {  {
104    // Clear frame buffer    // Clear frame buffer
105      glClearColor (0, 0, 0, 1);      glClearColor (0, 0, 0, 1);
# Line 69  Line 109 
109      glDisable(GL_CULL_FACE);      glDisable(GL_CULL_FACE);
110    
111    // Draw image    // Draw image
112      glDrawPixels (Width, Height, GL_RGBA, GL_FLOAT, img->data);      glEnable (GL_TEXTURE_2D);
113        glActiveTexture (GL_TEXTURE0);
114        glBindTexture (GL_TEXTURE_2D, txtId);
115        glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
116        glBegin (GL_QUADS);
117            glTexCoord2f (0.0, 0.0);
118            glVertex2f (0.0, 0.0);
119            glTexCoord2f (1.0, 0.0);
120            glVertex2f (1.0, 0.0);
121            glTexCoord2f (1.0, 1.0);
122            glVertex2f (1.0, 1.0);
123            glTexCoord2f (0.0, 1.0);
124            glVertex2f (0.0, 1.0);
125        glEnd();
126        glDisable (GL_TEXTURE_2D);
127      CheckError ();      CheckError ();
128    
129    // Present frame buffer    // Present frame buffer
# Line 82  Line 136 
136    // Set OpenGL viewport and camera    // Set OpenGL viewport and camera
137      glViewport(0, 0, width, height);      glViewport(0, 0, width, height);
138    
139        glMatrixMode (GL_PROJECTION);
140        glLoadIdentity ();
141        gluOrtho2D (0.0, 1.0, 0.0, 1.0);
142    
143        glMatrixMode (GL_MODELVIEW);
144        glLoadIdentity ();
145        gluLookAt (
146            0.0, 0.0, 1.0,
147            0.0, 0.0, 0.0,
148            0.0, 1.0, 0.0);
149    
150    // remember width and height    // remember width and height
151      Width = width;      Width = width;
152      Height = height;      Height = height;
# Line 90  Line 155 
155    
156  void GLFWCALL KeyCB (int key, int action)  void GLFWCALL KeyCB (int key, int action)
157  {  {
     if (action == GLFW_PRESS) {  
158          switch (key) {          switch (key) {
159            case '+': {        case '+':
160                  float mid = OpacMid + OPAC_DELTA;          if ((action == GLFW_PRESS) && (Dir >= 0))
161                  if (mid <= MAX_OPAC_MID) {              Dir++;
162                      OpacMid = mid;          break;
163                      VR_InVarSet_valOpacMid(World, mid);        case '-':
164                      NeedsRecompute = true;          if ((action == GLFW_PRESS) && (Dir <= 0))
165                  }              Dir--;
166              } break;          break;
           case '-': {  
                 float mid = OpacMid - OPAC_DELTA;  
                 if (mid >= MIN_OPAC_MID) {  
                     OpacMid = mid;  
                     VR_InVarSet_valOpacMid(World, mid);  
                     NeedsRecompute = true;  
                 }  
             } break;  
167            default:            default:
168              break;              break;
169          }          }
170      }      }
 }  
171    
172  void GetData (VR_World_t *wrld, Nrrd *nRGB)  void Compute (VR_World_t *wrld, bool fullSize, Nrrd *nRGB)
173  {  {
174        printf("computing %s... ", fullSize ? "" : "(fast) "); fflush(stdout);
175        double t0 = airTime();
176      // setup raycast parameters
177        if (fullSize) {
178            VR_InVarSet_imgResU (wrld, FULL_WID);
179            VR_InVarSet_imgResV (wrld, FULL_HT);
180            VR_InVarSet_rayStep (wrld, FULL_STEP);
181        }
182        else {
183            VR_InVarSet_imgResU (wrld, REDUCED_WID);
184            VR_InVarSet_imgResV (wrld, REDUCED_HT);
185            VR_InVarSet_rayStep (wrld, REDUCED_STEP);
186        }
187      // recompute
188        if (VR_Initially (wrld)) {
189          // error
190            fprintf(stderr, "Error initializing world: %s", VR_GetErrors(wrld));
191            exit(1);
192        }
193        int nSteps = VR_Run (wrld, 0);
194        printf(" %d steps in %5.3f seconds\n", nSteps, airTime() - t0);
195      // get output image
196      if (VR_OutputGet_outRGBA (wrld, nRGB)) {      if (VR_OutputGet_outRGBA (wrld, nRGB)) {
197        // error        // error
198          fprintf(stderr, "Error getting nrrd data\n");          fprintf(stderr, "Error getting nrrd data: %s", VR_GetErrors(wrld));
199          exit(1);          exit(1);
200      }      }
201  }  }
# Line 153  Line 230 
230    
231    // initialize inputs    // initialize inputs
232      VR_InVarSet_valOpacMid(wrld, OpacMid);      VR_InVarSet_valOpacMid(wrld, OpacMid);
233      Nrrd *nin = nrrdNew();      VR_InVarSetByName_hand (wrld, "data/vfrhand-nohip.nhdr");
   /* read in the nrrd from file */  
     if (nrrdLoad(nin, "data/vfrhand-nohip.nhdr", NULL) != 0) {  
         char *msg = biffGetDone(NRRD);  
         fprintf (stderr, "Error loading data: %s", msg);  
         exit (1);  
     }  
     VR_InVarSet_hand (wrld, nin);  
 //    nrrdNix (nin);  
234    
235    // nrrd for getting computational state    // nrrd for getting computational state
236      Nrrd *nRGB = nrrdNew();      Nrrd *nRGB = nrrdNew();
237    
238    // Main loop (repeated while window is not closed and [ESC] is not pressed)    // Main loop (repeated while window is not closed and [ESC] is not pressed)
239      NeedsRecompute = true;      NeedsRecompute = true;
240        GLuint txtId;
241      while (glfwGetWindowParam(GLFW_OPENED) && !glfwGetKey(GLFW_KEY_ESC)) {      while (glfwGetWindowParam(GLFW_OPENED) && !glfwGetKey(GLFW_KEY_ESC)) {
242          if (NeedsRecompute) {          if (Dir < 0) {
243  printf("computing ... "); fflush(stdout);              Dir++;
244            // recompute              float mid = OpacMid - OPAC_DELTA;
245              if (VR_Initially (wrld)) {              if (mid >= MIN_OPAC_MID) {
246                // error                  OpacMid = mid;
247                  fprintf(stderr, "Error initializing world: %s", VR_GetErrors(wrld));                  VR_InVarSet_valOpacMid(World, mid);
248                  exit(1);                  NeedsRecompute = true;
249                }
250            }
251            else if (Dir > 0) {
252                Dir--;
253                float mid = OpacMid + OPAC_DELTA;
254                if (mid <= MAX_OPAC_MID) {
255                    OpacMid = mid;
256                    VR_InVarSet_valOpacMid(World, mid);
257                    NeedsRecompute = true;
258              }              }
             int nSteps = VR_Run (wrld, 0);  
             printf(" %d steps\n", nSteps);  
           // get output image  
             if (VR_OutputGet_outRGBA (wrld, nRGB)) {  
               // error  
                 fprintf(stderr, "Error getting nrrd data: %s", VR_GetErrors(wrld));  
                 exit(1);  
259              }              }
260            if (NeedsRecompute) {
261                if (Dir != 0) {
262                    Compute(wrld, false, nRGB);
263                    InitTexture(&ReducedTexure, nRGB);
264                    txtId = ReducedTexure.id;
265                }
266                else {
267                    Compute (wrld, true, nRGB);
268                    InitTexture(&FullTexture, nRGB);
269              NeedsRecompute = false;              NeedsRecompute = false;
270                    txtId = FullTexture.id;
271                }
272              NeedsRedraw = true;              NeedsRedraw = true;
273          }          }
274          if (NeedsRedraw) {          if (NeedsRedraw) {
275              Draw (nRGB);              Draw (txtId);
276              NeedsRedraw = false;              NeedsRedraw = false;
277          }          }
278            if (NeedsRecompute)
279                glfwPollEvents();
280            else
281          glfwWaitEvents();          glfwWaitEvents();
282      }      }
283    
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