/*
- * Copyright (C) 2009-2010 Andy Spencer <andy753421@gmail.com>
+ * Copyright (C) 2009-2010
, 2012 Andy Spencer <andy753421@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
*/
/**
- * SECTION:gis-tile
+ * SECTION:grits-tile
* @short_description: Latitude/longitude overlays
*
- * Each #GisTile corresponds to a latitude/longitude box on the surface of the
- * earth. When drawn, the #GisTile renders an images associated with it to the
- * surface of the earth. This is primarily used to draw ground overlays.
+ * Each #GritsTile corresponds to a latitude/longitude box on the surface of
+ * the earth. When drawn, the #GritsTile renders an images associated with it
+ * to the surface of the earth. This is primarily used to draw ground overlays.
*
- * Each GisTile can be split into subtiles in order to draw higher resolution
+ * Each GritsTile can be split into subtiles in order to draw higher resolution
* overlays. Pointers to subtitles are stored in the parent tile and a parent
* pointer is stored in each child.
*
- * Each #GisTile has a data filed which must be set by the user in order for
- * the tile to be drawn. When used with GisOpenGL the data must be an integer
+ * Each #GritsTile has a data filed which must be set by the user in order for
+ * the tile to be drawn. When used with GritsOpenGL the data must be an integer
* representing the OpenGL texture to use when drawing the tile.
*/
+#define GL_GLEXT_PROTOTYPES
#include <config.h>
-#include <GL/gl.h>
-#include "gis-tile.h"
+#include <math.h>
+#include <string.h>
+#include "gtkgl.h"
+#include "grits-tile.h"
-gchar *gis_tile_path_table[2][2] = {
+static guint grits_tile_mask = 0;
+
+gchar *grits_tile_path_table[2][2] = {
{"00.", "01."},
{"10.", "11."},
};
/**
- * gis_tile_new:
+ * grits_tile_new:
* @parent: the parent for the tile, or NULL
* @n: the northern border of the tile
* @s: the southern border of the tile
*
* Create a tile associated with a particular latitude/longitude box.
*
- * Returns: the new #GisTile
+ * Returns: the new #GritsTile
*/
-GisTile *gis_tile_new(GisTile *parent,
+GritsTile *grits_tile_new(GritsTile *parent,
gdouble n, gdouble s, gdouble e, gdouble w)
{
- GisTile *tile = g_object_new(GIS_TYPE_TILE, NULL);
+ GritsTile *tile = g_object_new(GRITS_TYPE_TILE, NULL);
tile->parent = parent;
tile->atime = time(NULL);
- gis_bounds_set_bounds(&tile->coords, 0, 1, 1, 0);
- gis_bounds_set_bounds(&tile->edge, n, s, e, w);
+ grits_bounds_set_bounds(&tile->coords, 0, 1, 1, 0);
+ grits_bounds_set_bounds(&tile->edge, n, s, e, w);
+ if (parent)
+ tile->proj = parent->proj;
return tile;
}
/**
- * gis_tile_get_path:
+ * grits_tile_get_path:
* @child: the tile to generate a path for
*
* Generate a string representation of a tiles location in a group of nested
*
* Returns: the path representing the tiles's location
*/
-gchar *gis_tile_get_path(GisTile *child)
+gchar *grits_tile_get_path(GritsTile *child)
{
/* This could be easily cached if necessary */
int x, y;
GList *parts = NULL;
- for (GisTile *parent = child->parent; parent; child = parent, parent = child->parent)
- gis_tile_foreach_index(child, x, y)
+ for (GritsTile *parent = child->parent; parent; child = parent, parent = child->parent)
+ grits_tile_foreach_index(child, x, y)
if (parent->children[x][y] == child)
- parts = g_list_prepend(parts, gis_tile_path_table[x][y]);
+ parts = g_list_prepend(parts, grits_tile_path_table[x][y]);
GString *path = g_string_new("");
for (GList *cur = parts; cur; cur = cur->next)
g_string_append(path, cur->data);
return g_string_free(path, FALSE);
}
-static gdouble _gis_tile_get_min_dist(GisPoint *eye, GisBounds *bounds)
+static gdouble _grits_tile_get_min_dist(GritsPoint *eye, GritsBounds *bounds)
{
- GisPoint pos = {};
+ GritsPoint pos = {};
pos.lat = eye->lat > bounds->n ? bounds->n :
eye->lat < bounds->s ? bounds->s : eye->lat;
pos.lon = eye->lon > bounds->e ? bounds->e :
return distd(a, b);
}
-static gboolean _gis_tile_precise(GisPoint *eye, GisBounds *bounds,
+static gboolean _grits_tile_precise(GritsPoint *eye, GritsBounds *bounds,
gdouble max_res, gint width, gint height)
{
- gdouble min_dist = _gis_tile_get_min_dist(eye, bounds);
+ gdouble min_dist = _grits_tile_get_min_dist(eye, bounds);
gdouble view_res = MPPX(min_dist);
gdouble lat_point = bounds->n < 0 ? bounds->n :
gdouble lon_dist = bounds->e - bounds->w;
gdouble tile_res = ll2m(lon_dist, lat_point)/width;
- /* This isn't really right, but it helps with memory since we don't (yet?) test if the tile
- * would be drawn */
+ /* This isn't really right, but it helps with memory since we don't
+ * (yet?) test if the tile would be drawn */
gdouble scale = eye->elev / min_dist;
view_res /= scale;
+ view_res *= 1.8;
//view_res /= 1.4; /* make it a little nicer, not sure why this is needed */
//g_message("tile=(%7.2f %7.2f %7.2f %7.2f) "
// "eye=(%9.1f %9.1f %9.1f) "
// "elev=%9.1f / dist=%9.1f = %f",
- // tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w,
- // lat, lon, elev,
- // elev, min_dist, scale);
+ // bounds->n, bounds->s, bounds->e, bounds->w,
+ // eye->lat, eye->lon, eye->elev,
+ // eye->elev, min_dist, scale);
return tile_res < max_res ||
tile_res < view_res;
}
+static void _grits_tile_split_latlon(GritsTile *tile)
+{
+ //g_debug("GritsTile: split - %p", tile);
+ const gdouble rows = G_N_ELEMENTS(tile->children);
+ const gdouble cols = G_N_ELEMENTS(tile->children[0]);
+ const gdouble lat_dist = tile->edge.n - tile->edge.s;
+ const gdouble lon_dist = tile->edge.e - tile->edge.w;
+ const gdouble lat_step = lat_dist / rows;
+ const gdouble lon_step = lon_dist / cols;
+
+ int row, col;
+ grits_tile_foreach_index(tile, row, col) {
+ if (!tile->children[row][col])
+ tile->children[row][col] =
+ grits_tile_new(tile, 0, 0, 0, 0);
+ /* Set edges aferwards so that north and south
+ * get reset for mercator projections */
+ GritsTile *child = tile->children[row][col];
+ child->edge.n = tile->edge.n - lat_step*(row+0);
+ child->edge.s = tile->edge.n - lat_step*(row+1);
+ child->edge.e = tile->edge.w + lon_step*(col+1);
+ child->edge.w = tile->edge.w + lon_step*(col+0);
+ }
+}
+
+static void _grits_tile_split_mercator(GritsTile *tile)
+{
+ GritsTile *child = NULL;
+ GritsBounds tmp = tile->edge;
+
+ /* Project */
+ tile->edge.n = asinh(tan(deg2rad(tile->edge.n)));
+ tile->edge.s = asinh(tan(deg2rad(tile->edge.s)));
+
+ _grits_tile_split_latlon(tile);
+
+ /* Convert back to lat-lon */
+ tile->edge = tmp;
+ grits_tile_foreach(tile, child) {
+ child->edge.n = rad2deg(atan(sinh(child->edge.n)));
+ child->edge.s = rad2deg(atan(sinh(child->edge.s)));
+ }
+}
+
/**
- * gis_tile_update:
+ * grits_tile_update:
* @root: the root tile to split
* @eye: the point the tile is viewed from, for calculating distances
* @res: a maximum resolution in meters per pixel to split tiles to
* the tile is recursively subdivided until a sufficient resolution is
* achieved.
*/
-void gis_tile_update(GisTile *root, GisPoint *eye,
+void grits_tile_update(GritsTile *tile, GritsPoint *eye,
gdouble res, gint width, gint height,
- GisTileLoadFunc load_func, gpointer user_data)
+ GritsTileLoadFunc load_func, gpointer user_data)
{
- root->atime = time(NULL);
- //g_debug("GisTile: update - %p->atime = %u",
- // root, (guint)root->atime);
- const gdouble rows = G_N_ELEMENTS(root->children);
- const gdouble cols = G_N_ELEMENTS(root->children[0]);
- const gdouble lat_dist = root->edge.n - root->edge.s;
- const gdouble lon_dist = root->edge.e - root->edge.w;
- const gdouble lat_step = lat_dist / rows;
- const gdouble lon_step = lon_dist / cols;
- int row, col;
- gis_tile_foreach_index(root, row, col) {
- GisTile **child = &root->children[row][col];
- GisBounds edge;
- edge.n = root->edge.n-(lat_step*(row+0));
- edge.s = root->edge.n-(lat_step*(row+1));
- edge.e = root->edge.w+(lon_step*(col+1));
- edge.w = root->edge.w+(lon_step*(col+0));
- if (!_gis_tile_precise(eye, &edge, res,
- width/cols, height/rows)) {
- if (!*child) {
- *child = gis_tile_new(root, edge.n, edge.s,
- edge.e, edge.w);
- load_func(*child, user_data);
+ GritsTile *child;
+
+ if (tile == NULL)
+ return;
+
+ //g_debug("GritsTile: update - %p->atime = %u",
+ // tile, (guint)tile->atime);
+
+ /* Is the parent tile's texture high enough
+ * resolution for this part? */
+ gint xs = G_N_ELEMENTS(tile->children);
+ gint ys = G_N_ELEMENTS(tile->children[0]);
+ if (tile->parent && _grits_tile_precise(eye, &tile->edge,
+ res, width/xs, height/ys)) {
+ GRITS_OBJECT(tile)->hidden = TRUE;
+ return;
+ }
+
+ /* Load the tile */
+ if (!tile->load && !tile->data)
+ load_func(tile, user_data);
+ tile->atime = time(NULL);
+ tile->load = TRUE;
+ GRITS_OBJECT(tile)->hidden = FALSE;
+
+ /* Split tile if needed */
+ grits_tile_foreach(tile, child) {
+ if (child == NULL) {
+ switch (tile->proj) {
+ case GRITS_PROJ_LATLON: _grits_tile_split_latlon(tile); break;
+ case GRITS_PROJ_MERCATOR: _grits_tile_split_mercator(tile); break;
}
- gis_tile_update(*child, eye,
- res, width, height,
- load_func, user_data);
}
}
+
+ /* Update recursively */
+ grits_tile_foreach(tile, child)
+ grits_tile_update(child, eye, res, width, height,
+ load_func, user_data);
}
/**
- * gis_tile_find:
+ * grits_tile_find:
* @root: the root tile to search from
* @lat: target latitude
* @lon: target longitude
*
* Returns: the child tile
*/
-GisTile *gis_tile_find(GisTile *root, gdouble lat, gdouble lon)
+GritsTile *grits_tile_find(GritsTile *root, gdouble lat, gdouble lon)
{
gint rows = G_N_ELEMENTS(root->children);
gint cols = G_N_ELEMENTS(root->children[0]);
if (row < 0 || row >= rows || col < 0 || col >= cols)
return NULL;
else if (root->children[row][col] && root->children[row][col]->data)
- return gis_tile_find(root->children[row][col], lat, lon);
+ return grits_tile_find(root->children[row][col], lat, lon);
else
return root;
}
/**
- * gis_tile_gc:
+ * grits_tile_gc:
* @root: the root tile to start garbage collection at
* @atime: most recent time at which tiles will be kept
* @free_func: function used to free the image when a new tile is collected
*
* Returns: a pointer to the original tile, or NULL if it was garbage collected
*/
-GisTile *gis_tile_gc(GisTile *root, time_t atime,
- GisTileFreeFunc free_func, gpointer user_data)
+GritsTile *grits_tile_gc(GritsTile *root, time_t atime,
+ GritsTileFreeFunc free_func, gpointer user_data)
{
if (!root)
return NULL;
gboolean has_children = FALSE;
int x, y;
- gis_tile_foreach_index(root, x, y) {
- root->children[x][y] = gis_tile_gc(
+ grits_tile_foreach_index(root, x, y) {
+ root->children[x][y] = grits_tile_gc(
root->children[x][y], atime,
free_func, user_data);
if (root->children[x][y])
has_children = TRUE;
}
- //g_debug("GisTile: gc - %p->atime=%u < atime=%u",
- // root, (guint)root->atime, (guint)atime);
- if (!has_children && root->atime < atime && root->data) {
- free_func(root, user_data);
+ //g_debug("GritsTile: gc - %p kids=%d time=%d data=%d load=%d",
+ // root, !!has_children, root->atime < atime, !!root->data, !!root->load);
+ if (root->parent && !has_children && root->atime < atime &&
+ (root->data || !root->load)) {
+ //g_debug("GritsTile: gc/free - %p", root);
+ if (root->data)
+ free_func(root, user_data);
g_object_unref(root);
return NULL;
}
/* Use GObject for this */
/**
- * gis_tile_free:
+ * grits_tile_free:
* @root: the root tile to free
* @free_func: function used to free the image when a new tile is collected
* @user_data: user data to past to the free function
*
* Recursively free a tile and all it's children.
*/
-void gis_tile_free(GisTile *root, GisTileFreeFunc free_func, gpointer user_data)
+void grits_tile_free(GritsTile *root, GritsTileFreeFunc free_func, gpointer user_data)
{
if (!root)
return;
- GisTile *child;
- gis_tile_foreach(root, child)
- gis_tile_free(child, free_func, user_data);
+ GritsTile *child;
+ grits_tile_foreach(root, child)
+ grits_tile_free(child, free_func, user_data);
if (free_func)
free_func(root, user_data);
g_object_unref(root);
}
+/* Load texture mask so we can draw a texture to just a part of a triangle */
+static guint _grits_tile_load_mask(void)
+{
+ guint tex;
+ const int width = 256, height = 256;
+ guint8 *bytes = g_malloc(width*height);
+ memset(bytes, 0xff, width*height);
+ glGenTextures(1, &tex);
+ glBindTexture(GL_TEXTURE_2D, tex);
+
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, width, height, 0,
+ GL_ALPHA, GL_UNSIGNED_BYTE, bytes);
+
+ 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_free(bytes);
+ return tex;
+}
+
/* Draw a single tile */
-static void gis_tile_draw_one(GisTile *tile, GisOpenGL *opengl, GList *triangles)
+static void grits_tile_draw_one(GritsTile *tile, GritsOpenGL *opengl, GList *triangles)
{
if (!tile || !tile->data)
return;
if (!triangles)
- g_warning("GisOpenGL: _draw_tiles - No triangles to draw: edges=%f,%f,%f,%f",
+ g_warning("GritsOpenGL: _draw_tiles - No triangles to draw: edges=%f,%f,%f,%f",
tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
+
//g_message("drawing %4d triangles for tile edges=%7.2f,%7.2f,%7.2f,%7.2f",
// g_list_length(triangles), tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
+ tile->atime = time(NULL);
+
gdouble n = tile->edge.n;
gdouble s = tile->edge.s;
gdouble e = tile->edge.e;
gdouble xscale = tile->coords.e - tile->coords.w;
gdouble yscale = tile->coords.s - tile->coords.n;
+ glPolygonOffset(0, -tile->zindex);
+
for (GList *cur = triangles; cur; cur = cur->next) {
RoamTriangle *tri = cur->data;
xy[i][1] = tile->coords.n + xy[i][1]*yscale;
}
- glEnable(GL_TEXTURE_2D);
- glEnable(GL_POLYGON_OFFSET_FILL);
+ /* Draw triangle */
glBindTexture(GL_TEXTURE_2D, *(guint*)tile->data);
- glPolygonOffset(0, -tile->zindex);
+ glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glBegin(GL_TRIANGLES);
- glNormal3dv(tri->p.r->norm); glTexCoord2dv(xy[0]); glVertex3dv((double*)tri->p.r);
- glNormal3dv(tri->p.m->norm); glTexCoord2dv(xy[1]); glVertex3dv((double*)tri->p.m);
- glNormal3dv(tri->p.l->norm); glTexCoord2dv(xy[2]); glVertex3dv((double*)tri->p.l);
+ glNormal3dv(tri->p.r->norm); glMultiTexCoord2dv(GL_TEXTURE0, xy[0]); glMultiTexCoord2dv(GL_TEXTURE1, xy[0]); glVertex3dv((double*)tri->p.r);
+ glNormal3dv(tri->p.m->norm); glMultiTexCoord2dv(GL_TEXTURE0, xy[1]); glMultiTexCoord2dv(GL_TEXTURE1, xy[1]); glVertex3dv((double*)tri->p.m);
+ glNormal3dv(tri->p.l->norm); glMultiTexCoord2dv(GL_TEXTURE0, xy[2]); glMultiTexCoord2dv(GL_TEXTURE1, xy[2]); glVertex3dv((double*)tri->p.l);
glEnd();
}
}
/* Draw the tile */
-static void gis_tile_draw_rec(GisTile *tile, GisOpenGL *opengl)
+static gboolean grits_tile_draw_rec(GritsTile *tile, GritsOpenGL *opengl)
{
- /* Only draw children if possible */
- gboolean has_children = FALSE;
- GisTile *child;
- gis_tile_foreach(tile, child)
- if (child && child->data)
- has_children = TRUE;
+ //g_debug("GritsTile: draw_rec - tile=%p, data=%d, load=%d, hide=%d", tile,
+ // tile ? !!tile->data : 0,
+ // tile ? !!tile->load : 0,
+ // tile ? !!GRITS_OBJECT(tile)->hidden : 0);
- GList *triangles = NULL;
- if (has_children) {
- /* TODO: simplify this */
- const gdouble rows = G_N_ELEMENTS(tile->children);
- const gdouble cols = G_N_ELEMENTS(tile->children[0]);
- const gdouble lat_dist = tile->edge.n - tile->edge.s;
- const gdouble lon_dist = tile->edge.e - tile->edge.w;
- const gdouble lat_step = lat_dist / rows;
- const gdouble lon_step = lon_dist / cols;
- int row, col;
- gis_tile_foreach_index(tile, row, col) {
- GisTile *child = tile->children[row][col];
- if (child && child->data) {
- gis_tile_draw_rec(child, opengl);
- } else {
- const gdouble n = tile->edge.n-(lat_step*(row+0));
- const gdouble s = tile->edge.n-(lat_step*(row+1));
- const gdouble e = tile->edge.w+(lon_step*(col+1));
- const gdouble w = tile->edge.w+(lon_step*(col+0));
- GList *these = roam_sphere_get_intersect(opengl->sphere,
- FALSE, n, s, e, w);
- triangles = g_list_concat(triangles, these);
- }
- }
- } else {
- triangles = roam_sphere_get_intersect(opengl->sphere, FALSE,
+ if (!tile || !tile->data || GRITS_OBJECT(tile)->hidden)
+ return FALSE;
+
+ GritsTile *child = NULL;
+
+ /* Draw child tiles */
+ gboolean draw_parent = FALSE;
+ grits_tile_foreach(tile, child)
+ if (!grits_tile_draw_rec(child, opengl))
+ draw_parent = TRUE;
+
+ /* Draw parent tile underneath using depth test */
+ if (draw_parent) {
+ GList *triangles = roam_sphere_get_intersect(opengl->sphere, FALSE,
tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
+ grits_tile_draw_one(tile, opengl, triangles);
+ g_list_free(triangles);
}
- if (triangles)
- gis_tile_draw_one(tile, opengl, triangles);
- g_list_free(triangles);
+
+ return TRUE;
}
-static void gis_tile_draw(GisObject *tile, GisOpenGL *opengl)
+static void grits_tile_draw(GritsObject *tile, GritsOpenGL *opengl)
{
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LESS);
- gis_tile_draw_rec(GIS_TILE(tile), opengl);
+ glEnable(GL_ALPHA_TEST);
+ glAlphaFunc(GL_GREATER, 0.1);
+ glEnable(GL_POLYGON_OFFSET_FILL);
+ glEnable(GL_BLEND);
+
+ /* Setup texture mask */
+ if (!grits_tile_mask)
+ grits_tile_mask = _grits_tile_load_mask();
+ glActiveTexture(GL_TEXTURE1);
+ glEnable(GL_TEXTURE_2D);
+ glBindTexture(GL_TEXTURE_2D, grits_tile_mask);
+ glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+
+ /* Setup texture */
+ glActiveTexture(GL_TEXTURE0);
+ glEnable(GL_TEXTURE_2D);
+
+ /* Hack to show maps tiles with better color */
+ if (GRITS_TILE(tile)->proj == GRITS_PROJ_MERCATOR) {
+ float material_emission[] = {0.5, 0.5, 0.5, 1.0};
+ glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, material_emission);
+ }
+
+ /* Draw all tiles */
+ grits_tile_draw_rec(GRITS_TILE(tile), opengl);
+
+ /* Disable texture mask */
+ glActiveTexture(GL_TEXTURE1);
+ glDisable(GL_TEXTURE_2D);
+ glActiveTexture(GL_TEXTURE0);
}
/* GObject code */
-G_DEFINE_TYPE(GisTile, gis_tile, GIS_TYPE_OBJECT);
-static void gis_tile_init(GisTile *tile)
+G_DEFINE_TYPE(GritsTile, grits_tile, GRITS_TYPE_OBJECT);
+static void grits_tile_init(GritsTile *tile)
{
}
-static void gis_tile_class_init(GisTileClass *klass)
+static void grits_tile_class_init(GritsTileClass *klass)
{
- g_debug("GisTile: class_init");
- GisObjectClass *object_class = GIS_OBJECT_CLASS(klass);
- object_class->draw = gis_tile_draw;
+ g_debug("GritsTile: class_init");
+ GritsObjectClass *object_class = GRITS_OBJECT_CLASS(klass);
+ object_class->draw = grits_tile_draw;
}
projects / grits / blobdiff