Pileus Git - grits/blob - src/radar.c

   1 #include <config.h>
   2 #include <gtk/gtk.h>
   3 #include <GL/gl.h>
   4 #include <math.h>
   5
   6 #include "rsl.h"
   7
   8 #include "radar.h"
   9
  10 GtkWidget *drawing;
  11 static Sweep *cur_sweep = NULL;  // make this not global
  12 static int nred, ngreen, nblue;
  13 static char red[256], green[256], blue[256];
  14 static guint sweep_tex = 0;
  15
  16 static guint8 get_alpha(guint8 db)
  17 {
  18         if (db == BADVAL) return 0;
  19         if (db == RFVAL ) return 0;
  20         if (db == APFLAG) return 0;
  21         if (db == NOECHO) return 0;
  22         if (db == 0     ) return 0;
  23         //if      (db > 60) return 0;
  24         //else if (db < 10) return 0;
  25         //else if (db < 25) return (db-10)*(255.0/15);
  26         else              return 255;
  27 }
  28
  29 //#ifdef USE_TWO_BYTE_PRECISION
  30 //#define F_FACTOR 100.0
  31 //#define F_DR_FACTOR 1000.0
  32 //#define F_DZ_RANGE_OFFSET 50
  33 //#else
  34 //#define F_FACTOR 2.0
  35 //#define F_DR_FACTOR 10.0
  36 //#define F_DZ_RANGE_OFFSET 32
  37 //#endif
  38 //#define F_OFFSET 4
  39 //static float dz_f(Range x)
  40 //{
  41 //      if (x >= F_OFFSET)
  42 //              return (((float)x-F_OFFSET)/F_FACTOR - F_DZ_RANGE_OFFSET);
  43 //      if (x == 0) return BADVAL;
  44 //      if (x == 1) return RFVAL;
  45 //      if (x == 2) return APFLAG;
  46 //      if (x == 3) return NOECHO;
  47 //      return BADVAL;
  48 //}
  49
  50 /* Convert a sweep to an 2d array of data points */
  51 static void bscan_sweep(Sweep *sweep, guint8 **data, int *width, int *height)
  52 {
  53         /* Calculate max number of bins */
  54         int i, max_bins = 0;
  55         for (i = 0; i < sweep->h.nrays; i++)
  56                 max_bins = MAX(max_bins, sweep->ray[i]->h.nbins);
  57
  58         /* Allocate buffer using max number of bins for each ray */
  59         guint8 *buf = g_malloc0(sweep->h.nrays * max_bins * 4);
  60
  61         /* Fill the data */
  62         int ri, bi;
  63         for (ri = 0; ri < sweep->h.nrays; ri++) {
  64                 Ray *ray  = sweep->ray[ri];
  65                 for (bi = 0; bi < ray->h.nbins; bi++) {
  66                         /* copy RGBA into buffer */
  67                         //guint val   = dz_f(ray->range[bi]);
  68                         guint val   = ray->h.f(ray->range[bi]);
  69                         guint buf_i = (ri*max_bins+bi)*4;
  70                         buf[buf_i+0] =   red[val];
  71                         buf[buf_i+1] = green[val];
  72                         buf[buf_i+2] =  blue[val];
  73                         buf[buf_i+3] = get_alpha(val);
  74                 }
  75         }
  76
  77         /* set output */
  78         *width  = max_bins;
  79         *height = sweep->h.nrays;
  80         *data   = buf;
  81 }
  82
  83 /* Load a sweep as the active texture */
  84 static void load_sweep(Sweep *sweep)
  85 {
  86         cur_sweep = sweep;
  87         int height, width;
  88         guint8 *data;
  89         bscan_sweep(sweep, &data, &width, &height);
  90         glGenTextures(1, &sweep_tex);
  91         glBindTexture(GL_TEXTURE_2D, sweep_tex);
  92         glPixelStorei(GL_PACK_ALIGNMENT, 1);
  93         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  94         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  95         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  96         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
  97         g_free(data);
  98         gdk_window_invalidate_rect(drawing->window, &drawing->allocation, FALSE);
  99         gdk_window_process_updates(drawing->window, FALSE);
 100 }
 101
 102 /* Load the default sweep */
 103 static gboolean configure(GtkWidget *da, GdkEventConfigure *event, gpointer user_data)
 104 {
 105         Sweep *first = (Sweep*)user_data;
 106         if (cur_sweep == NULL)
 107                 load_sweep(first);
 108         return FALSE;
 109 }
 110
 111 static gboolean expose(GtkWidget *da, GdkEventExpose *event, gpointer user_data)
 112 {
 113         g_message("radar:expose");
 114         Sweep *sweep = cur_sweep;
 115
 116         /* Draw the rays */
 117
 118         glPushMatrix();
 119         glBindTexture(GL_TEXTURE_2D, sweep_tex);
 120         glEnable(GL_TEXTURE_2D);
 121         glColor4f(1,1,1,1);
 122         glBegin(GL_QUAD_STRIP);
 123         for (int ri = 0; ri <= sweep->h.nrays+1; ri++) {
 124                 /* Do the first sweep twice to complete the last Quad */
 125                 Ray *ray = sweep->ray[ri % sweep->h.nrays];
 126
 127                 /* right and left looking out from radar */
 128                 double left  = ((ray->h.azimuth - ((double)ray->h.beam_width/2.))*M_PI)/180.0;
 129                 //double right = ((ray->h.azimuth + ((double)ray->h.beam_width/2.))*M_PI)/180.0;
 130
 131                 double lx = sin(left);
 132                 double ly = cos(left);
 133
 134                 double near_dist = ray->h.range_bin1;
 135                 double far_dist  = ray->h.nbins*ray->h.gate_size + ray->h.range_bin1;
 136
 137                 /* (find middle of bin) / scale for opengl */
 138                 // near left
 139                 glTexCoord2f(0.0, (double)ri/sweep->h.nrays);
 140                 glVertex3f(lx*near_dist, ly*near_dist, 1.0);
 141
 142                 // far  left
 143                 glTexCoord2f(1.0, (double)ri/sweep->h.nrays);
 144                 glVertex3f(lx*far_dist,  ly*far_dist,  1.0);
 145         }
 146         //g_print("ri=%d, nr=%d, bw=%f\n", _ri, sweep->h.nrays, sweep->h.beam_width);
 147         glEnd();
 148         glPopMatrix();
 149
 150         /* Texture debug */
 151         //glBegin(GL_QUADS);
 152         //glTexCoord2d( 0.,  0.); glVertex3f(-1.,  0., 0.); // bot left
 153         //glTexCoord2d( 0.,  1.); glVertex3f(-1.,  1., 0.); // top left
 154         //glTexCoord2d( 1.,  1.); glVertex3f( 0.,  1., 0.); // top right
 155         //glTexCoord2d( 1.,  0.); glVertex3f( 0.,  0., 0.); // bot right
 156         //glEnd();
 157
 158         /* Print the color table */
 159         glDisable(GL_TEXTURE_2D);
 160         glMatrixMode(GL_MODELVIEW ); glPushMatrix(); glLoadIdentity();
 161         glMatrixMode(GL_PROJECTION); glPushMatrix(); glLoadIdentity();
 162         glBegin(GL_QUADS);
 163         int i;
 164         for (i = 0; i < nred; i++) {
 165                 glColor4ub(red[i], green[i], blue[i], get_alpha(i));
 166                 glVertex3f(-1.0, (float)((i  ) - nred/2)/(nred/2), 0.0); // bot left
 167                 glVertex3f(-1.0, (float)((i+1) - nred/2)/(nred/2), 0.0); // top left
 168                 glVertex3f(-0.9, (float)((i+1) - nred/2)/(nred/2), 0.0); // top right
 169                 glVertex3f(-0.9, (float)((i  ) - nred/2)/(nred/2), 0.0); // bot right
 170         }
 171         glEnd();
 172         glMatrixMode(GL_PROJECTION); glPopMatrix();
 173         glMatrixMode(GL_MODELVIEW ); glPopMatrix();
 174
 175         return FALSE;
 176 }
 177
 178 gboolean radar_init(GtkDrawingArea *_drawing, GtkNotebook *config)
 179 {
 180         drawing = GTK_WIDGET(_drawing);
 181
 182         /* Parse hard coded file.. */
 183         RSL_read_these_sweeps("all", NULL);
 184         //RSL_read_these_sweeps("all", NULL);
 185         Radar *radar = RSL_wsr88d_to_radar("/scratch/aweather/data/level2/KNQA_20090501_1925.raw", "KNQA");
 186         RSL_load_refl_color_table();
 187         RSL_get_color_table(RSL_RED_TABLE,   red,   &nred);
 188         RSL_get_color_table(RSL_GREEN_TABLE, green, &ngreen);
 189         RSL_get_color_table(RSL_BLUE_TABLE,  blue,  &nblue);
 190         if (radar->h.nvolumes < 1 || radar->v[0]->h.nsweeps < 1)
 191                 g_print("No sweeps found\n");
 192
 193         /* Add configuration tab */
 194         GtkWidget *hbox = gtk_hbox_new(TRUE, 0);
 195         GtkWidget *button = NULL;
 196         int vi = 0, si = 0;
 197         for (vi = 0; vi < radar->h.nvolumes; vi++) {
 198                 Volume *vol = radar->v[vi];
 199                 if (vol == NULL) continue;
 200                 GtkWidget *vbox = gtk_vbox_new(TRUE, 0);
 201                 gtk_box_pack_start(GTK_BOX(hbox), vbox, TRUE, TRUE, 0);
 202                 for (si = 0; si < vol->h.nsweeps; si++) {
 203                         Sweep *sweep = vol->sweep[si];
 204                         if (sweep == NULL) continue;
 205                         char *label = g_strdup_printf("Tilt: %.2f (%s)", sweep->h.elev, vol->h.type_str);
 206                         button = gtk_radio_button_new_with_label_from_widget(GTK_RADIO_BUTTON(button), label);
 207                         g_signal_connect_swapped(button, "clicked", G_CALLBACK(load_sweep), sweep);
 208                         gtk_box_pack_start(GTK_BOX(vbox), button, TRUE, TRUE, 0);
 209                         g_free(label);
 210                 }
 211         }
 212         GtkWidget *label = gtk_label_new("Radar");
 213         gtk_notebook_append_page(GTK_NOTEBOOK(config), hbox, label);
 214
 215         /* Set up OpenGL Stuff */
 216         g_signal_connect(drawing, "expose-event",    G_CALLBACK(expose),    NULL);
 217         g_signal_connect(drawing, "configure-event", G_CALLBACK(configure), radar->v[0]->sweep[0]);
 218
 219         return TRUE;
 220 }