#include "srtm.h"
-/***********
- * Helpers *
- ***********/
-static gboolean rotate(gpointer _self)
+#define MAX_RESOLUTION 500
+#define TILE_WIDTH 1024
+#define TILE_HEIGHT 512
+
+struct _TileData {
+ /* OpenGL has to be first to make gis_opengl_render_tiles happy */
+ guint opengl;
+ guint16 *bil;
+};
+
+static gdouble _height_func(gdouble lat, gdouble lon, gpointer _self)
{
GisPluginSrtm *self = _self;
- if (gtk_toggle_button_get_active(self->button)) {
- self->rotation += 1.0;
- gis_opengl_redraw(self->opengl);
+ if (!self) return 0;
+
+ GisTile *tile = gis_tile_find(self->tiles, lat, lon);
+ if (!tile) return 0;
+
+ struct _TileData *data = tile->data;
+ if (!data) return 0;
+
+ guint16 *bil = data->bil;
+ if (!bil) return 0;
+
+ gint w = TILE_WIDTH;
+ gint h = TILE_HEIGHT;
+
+ gdouble ymin = tile->edge.s;
+ gdouble ymax = tile->edge.n;
+ gdouble xmin = tile->edge.w;
+ gdouble xmax = tile->edge.e;
+
+ gdouble xdist = xmax - xmin;
+ gdouble ydist = ymax - ymin;
+
+ gdouble x = (lon-xmin)/xdist * w;
+ gdouble y = (1-(lat-ymin)/ydist) * h;
+
+ gdouble x_rem = x - (int)x;
+ gdouble y_rem = y - (int)y;
+ guint x_flr = (int)x;
+ guint y_flr = (int)y;
+
+ /* TODO: Fix interpolation at edges:
+ * - Pad these at the edges instead of wrapping/truncating
+ * - Figure out which pixels to index (is 0,0 edge, center, etc) */
+ gint16 px00 = bil[MIN((y_flr ),h-1)*w + MIN((x_flr ),w-1)];
+ gint16 px10 = bil[MIN((y_flr ),h-1)*w + MIN((x_flr+1),w-1)];
+ gint16 px01 = bil[MIN((y_flr+1),h-1)*w + MIN((x_flr ),w-1)];
+ gint16 px11 = bil[MIN((y_flr+1),h-1)*w + MIN((x_flr+1),w-1)];
+
+ gdouble elev =
+ px00 * (1-x_rem) * (1-y_rem) +
+ px10 * ( x_rem) * (1-y_rem) +
+ px01 * (1-x_rem) * ( y_rem) +
+ px11 * ( x_rem) * ( y_rem);
+ return elev;
+}
+
+/**********************
+ * Loader and Freeers *
+ **********************/
+#define LOAD_BIL TRUE
+#define LOAD_OPENGL TRUE
+static guint16 *_load_bil(gchar *path)
+{
+ gchar *data;
+ g_file_get_contents(path, &data, NULL, NULL);
+ g_debug("GisPluginSrtm: load_bil %p", data);
+ return (guint16*)data;
+}
+static GdkPixbuf *_load_pixbuf(guint16 *bil)
+{
+ GdkPixbuf *pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, FALSE, 8, TILE_WIDTH, TILE_HEIGHT);
+ guchar *pixels = gdk_pixbuf_get_pixels(pixbuf);
+ gint stride = gdk_pixbuf_get_rowstride(pixbuf);
+ gint nchan = gdk_pixbuf_get_n_channels(pixbuf);
+
+ for (int r = 0; r < TILE_HEIGHT; r++) {
+ for (int c = 0; c < TILE_WIDTH; c++) {
+ gint16 value = bil[r*TILE_WIDTH + c];
+ //guchar color = (float)(MAX(value,0))/8848 * 255;
+ guchar color = (float)value/8848 * 255;
+ pixels[r*stride + c*nchan + 0] = color;
+ pixels[r*stride + c*nchan + 1] = color;
+ pixels[r*stride + c*nchan + 2] = color;
+ if (nchan == 4)
+ pixels[r*stride + c*nchan + 3] = 128;
+ }
}
- return TRUE;
+ g_debug("GisPluginSrtm: load_pixbuf %p", pixbuf);
+ return pixbuf;
}
+static guint _load_opengl(GdkPixbuf *pixbuf)
+{
+ /* Load image */
+ guchar *pixels = gdk_pixbuf_get_pixels(pixbuf);
+ gint alpha = gdk_pixbuf_get_has_alpha(pixbuf);
+ gint nchan = 4; // gdk_pixbuf_get_n_channels(pixbuf);
+ gint width = gdk_pixbuf_get_width(pixbuf);
+ gint height = gdk_pixbuf_get_height(pixbuf);
+
+ /* Create Texture */
+ guint opengl;
+ glGenTextures(1, &opengl);
+ glBindTexture(GL_TEXTURE_2D, opengl);
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+ glPixelStorei(GL_PACK_ALIGNMENT, 1);
+ glTexImage2D(GL_TEXTURE_2D, 0, nchan, width, height, 0,
+ (alpha ? GL_RGBA : GL_RGB), GL_UNSIGNED_BYTE, pixels);
+ glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+ glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
+
+ g_debug("GisPluginSrtm: load_opengl %d", opengl);
+ return opengl;
+}
+static void _load_tile(GisTile *tile, gpointer _self)
+{
+ GisPluginSrtm *self = _self;
+ g_debug("GisPluginSrtm: _load_tile");
+
+ struct _TileData *data = g_new0(struct _TileData, 1);
+ gchar *path = gis_wms_make_local(self->wms, tile);
+ if (LOAD_BIL || LOAD_OPENGL)
+ data->bil = _load_bil(path);
+ g_free(path);
+ if (LOAD_OPENGL) {
+ GdkPixbuf *pixbuf = _load_pixbuf(data->bil);
+ data->opengl = _load_opengl(pixbuf);
+ g_object_unref(pixbuf);
+ }
+
+ /* Do necessasairy processing */
+ if (LOAD_BIL)
+ gis_opengl_set_height_func(self->opengl, tile,
+ _height_func, self, TRUE);
+
+ /* Cleanup unneeded things */
+ if (!LOAD_BIL)
+ g_free(data->bil);
+
+ tile->data = data;
+}
+
+static void _free_tile(GisTile *tile, gpointer _self)
+{
+ GisPluginSrtm *self = _self;
+ struct _TileData *data = tile->data;
+ g_debug("GisPluginSrtm: _free_tile: %p=%d", data, data->opengl);
+ if (LOAD_BIL)
+ g_free(data->bil);
+ if (LOAD_OPENGL)
+ glDeleteTextures(1, &data->opengl);
+ g_free(data);
+}
+
+static gpointer _update_tiles(gpointer _self)
+{
+ GisPluginSrtm *self = _self;
+ gdouble lat, lon, elev;
+ gis_view_get_location(self->view, &lat, &lon, &elev);
+ gis_tile_update(self->tiles,
+ MAX_RESOLUTION, TILE_WIDTH, TILE_WIDTH,
+ lat, lon, elev,
+ _load_tile, self);
+ gis_tile_gc(self->tiles, time(NULL)-10,
+ _free_tile, self);
+ return NULL;
+}
+
+/*************
+ * Callbacks *
+ *************/
+static void _on_location_changed(GisView *view, gdouble lat, gdouble lon, gdouble elev,
+ GisPluginSrtm *self)
+{
+ _update_tiles(self);
+}
/***********
* Methods *
{
g_debug("GisPluginSrtm: new");
GisPluginSrtm *self = g_object_new(GIS_TYPE_PLUGIN_SRTM, NULL);
+ self->view = view;
self->opengl = opengl;
- return self;
-}
+ /* Load initial tiles */
+ _load_tile(self->tiles, self);
+ _update_tiles(self);
-static GtkWidget *gis_plugin_srtm_get_config(GisPlugin *_self)
-{
- GisPluginSrtm *self = GIS_PLUGIN_SRTM(_self);
- return GTK_WIDGET(self->button);
+ /* Connect signals */
+ g_signal_connect(view, "location-changed", G_CALLBACK(_on_location_changed), self);
+
+ return self;
}
static void gis_plugin_srtm_expose(GisPlugin *_self)
{
GisPluginSrtm *self = GIS_PLUGIN_SRTM(_self);
- g_debug("GisPluginSrtm: expose");
-
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- glOrtho(1,-1, -1,1, -10,10);
-
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
-
- float light_ambient[] = {0.1f, 0.1f, 0.0f, 1.0f};
- float light_diffuse[] = {0.9f, 0.9f, 0.9f, 1.0f};
- float light_position[] = {-30.0f, 50.0f, 40.0f, 1.0f};
- glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
- glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
- glLightfv(GL_LIGHT0, GL_POSITION, light_position);
- glEnable(GL_COLOR_MATERIAL);
-
- glTranslatef(0.5, -0.5, -2);
- glRotatef(self->rotation, 1, 1, 0);
- glColor4f(0.9, 0.9, 0.7, 1.0);
- glDisable(GL_CULL_FACE);
- gdk_gl_draw_teapot(TRUE, 0.25);
+ g_debug("GisPluginSrtm: expose tiles=%p data=%p",
+ self->tiles, self->tiles->data);
+ if (LOAD_OPENGL)
+ gis_opengl_render_tiles(self->opengl, self->tiles);
}
{
g_debug("GisPluginSrtm: plugin_init");
/* Add methods to the interface */
- iface->expose = gis_plugin_srtm_expose;
- iface->get_config = gis_plugin_srtm_get_config;
+ iface->expose = gis_plugin_srtm_expose;
}
/* Class/Object init */
static void gis_plugin_srtm_init(GisPluginSrtm *self)
{
g_debug("GisPluginSrtm: init");
/* Set defaults */
- self->button = GTK_TOGGLE_BUTTON(gtk_toggle_button_new_with_label("Rotate"));
- self->rotate_id = g_timeout_add(1000/60, rotate, self);
- self->rotation = 30.0;
- self->opengl = NULL;
+ self->tiles = gis_tile_new(NULL, NORTH, SOUTH, EAST, WEST);
+ self->wms = gis_wms_new(
+ "http://www.nasa.network.com/elev", "srtm30", "application/bil",
+ "srtm", ".bil", TILE_WIDTH, TILE_HEIGHT);
}
static void gis_plugin_srtm_dispose(GObject *gobject)
{
g_debug("GisPluginSrtm: dispose");
GisPluginSrtm *self = GIS_PLUGIN_SRTM(gobject);
- g_source_remove(self->rotate_id);
/* Drop references */
G_OBJECT_CLASS(gis_plugin_srtm_parent_class)->dispose(gobject);
}
g_debug("GisPluginSrtm: finalize");
GisPluginSrtm *self = GIS_PLUGIN_SRTM(gobject);
/* Free data */
+ gis_tile_free(self->tiles, _free_tile, self);
+ gis_wms_free(self->wms);
G_OBJECT_CLASS(gis_plugin_srtm_parent_class)->finalize(gobject);
}
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