Compute near/far clipping planes

[grits] / src / grits-opengl.c

diff --git a/src/grits-opengl.c b/src/grits-opengl.c
index 774c75725f02e628945fed7e389cf533e00adc92..dc13ea2411bbdcb6eb482b1efb95032b4a1064cd 100644 (file)
--- a/src/grits-opengl.c
+++ b/src/grits-opengl.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2009-2010 Andy Spencer <andy753421@gmail.com>
+ * Copyright (C) 2009-2011 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
@@ -32,8 +32,6 @@
 #include <string.h>
 #include <gdk/gdkkeysyms.h>
 #include <gtk/gtk.h>
-#include <GL/gl.h>
-#include <GL/glu.h>
 
 #include "grits-opengl.h"
 #include "grits-util.h"
@@ -59,13 +57,30 @@ struct RenderLevel {
  ***********/
 static void _set_visuals(GritsOpenGL *opengl)
 {
+       double lat, lon, elev, rx, ry, rz;
+       grits_viewer_get_location(GRITS_VIEWER(opengl), &lat, &lon, &elev);
+       grits_viewer_get_rotation(GRITS_VIEWER(opengl), &rx, &ry, &rz);
+
+       /* Set projection and clipping planes */
+       glMatrixMode(GL_PROJECTION);
+       glLoadIdentity();
+
+       double width  = GTK_WIDGET(opengl)->allocation.width;
+       double height = GTK_WIDGET(opengl)->allocation.height;
+       double ang    = atan(height/FOV_DIST);
+       double atmos  = 100000;
+       double near   = MAX(elev - atmos, 10);    // View 100km of atmosphere
+       double far    = elev + 2*EARTH_R + atmos; // on both sides of the earth
+
+       grits_viewer_get_location(GRITS_VIEWER(opengl), &lat, &lon, &elev);
+       glViewport(0, 0, width, height);
+       gluPerspective(rad2deg(ang)*2, width/height, near, far);
+
+       /* Setup camera and lighting */
        glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();
 
        /* Camera 1 */
-       double lat, lon, elev, rx, ry, rz;
-       grits_viewer_get_location(GRITS_VIEWER(opengl), &lat, &lon, &elev);
-       grits_viewer_get_rotation(GRITS_VIEWER(opengl), &rx, &ry, &rz);
        glRotatef(rx, 1, 0, 0);
        glRotatef(rz, 0, 0, 1);
 
@@ -142,6 +157,18 @@ static void _foreach_object(GritsOpenGL *opengl, GFunc func, gpointer user_data)
        g_tree_foreach(opengl->objects, _foreach_object_cb, pointers);
 }
 
+static void _add_object(GritsObject *object, GPtrArray *array)
+{
+       g_ptr_array_add(array, object);
+}
+
+static GPtrArray *_objects_to_array(GritsOpenGL *opengl)
+{
+       GPtrArray *array = g_ptr_array_new();
+       _foreach_object(opengl, (GFunc)_add_object, array);
+       return array;
+}
+
 /*************
  * Callbacks *
  *************/
@@ -149,16 +176,7 @@ static gboolean on_configure(GritsOpenGL *opengl, GdkEventConfigure *event, gpoi
 {
        g_debug("GritsOpenGL: on_configure");
 
-       double width  = GTK_WIDGET(opengl)->allocation.width;
-       double height = GTK_WIDGET(opengl)->allocation.height;
-
-       /* Setup OpenGL Window */
-       glViewport(0, 0, width, height);
-       glMatrixMode(GL_PROJECTION);
-       glLoadIdentity();
-       double ang = atan(height/FOV_DIST);
-       gluPerspective(rad2deg(ang)*2, width/height, 10, 100*EARTH_R);
-
+       _set_visuals(opengl);
 #ifndef ROAM_DEBUG
        g_mutex_lock(opengl->sphere_lock);
        roam_sphere_update_errors(opengl->sphere);
@@ -170,7 +188,7 @@ static gboolean on_configure(GritsOpenGL *opengl, GdkEventConfigure *event, gpoi
 
 static gboolean _draw_level(gpointer key, gpointer value, gpointer user_data)
 {
-       g_debug("GritsOpenGL: _draw_level - level=%-4d", (int)key);
+       g_debug("GritsOpenGL: _draw_level - level=%-4ld", (glong)key);
        GritsOpenGL *opengl = user_data;
        struct RenderLevel *level = value;
        int nsorted = 0, nunsorted = 0;
@@ -200,6 +218,8 @@ static gboolean on_expose(GritsOpenGL *opengl, GdkEventExpose *event, gpointer _
 {
        g_debug("GritsOpenGL: on_expose - begin");
 
+       gtk_gl_begin(GTK_WIDGET(opengl));
+
        glClear(GL_COLOR_BUFFER_BIT);
 
        _set_visuals(opengl);
@@ -255,7 +275,14 @@ static gboolean on_motion_notify(GritsOpenGL *opengl, GdkEventMotion *event, gpo
 
        /* Run picking */
        g_mutex_lock(opengl->objects_lock);
-       _foreach_object(opengl, (GFunc)grits_object_pick_begin, opengl);
+       GPtrArray *objects = _objects_to_array(opengl);
+       for (guint i = 0; i < objects->len; i++) {
+               glPushName(i);
+               GritsObject *object = objects->pdata[i];
+               object->state.picked = FALSE;
+               grits_object_pick(object, opengl);
+               glPopName();
+       }
        int hits = glRenderMode(GL_RENDER);
        g_debug("GritsOpenGL: on_motion_notify - hits=%d ev=%.0lf,%.0lf",
                        hits, gl_x, gl_y);
@@ -265,10 +292,15 @@ static gboolean on_motion_notify(GritsOpenGL *opengl, GdkEventMotion *event, gpo
                //g_debug("\t\tz1:    %f", (float)buffer[i][1]/0x7fffffff);
                //g_debug("\t\tz2:    %f", (float)buffer[i][2]/0x7fffffff);
                //g_debug("\t\tname:  %p", (gpointer)buffer[i][3]);
-               GritsObject *object = GRITS_OBJECT(buffer[i][3]);
-               grits_object_pick_pointer(object, gl_x, gl_y);
+               guint        index  = buffer[i][3];
+               GritsObject *object = objects->pdata[index];
+               object->state.picked = TRUE;
        }
-       _foreach_object(opengl, (GFunc)grits_object_pick_end, NULL);
+       for (guint i = 0; i < objects->len; i++) {
+               GritsObject *object = objects->pdata[i];
+               grits_object_set_pointer(object, object->state.picked);
+       }
+       g_ptr_array_free(objects, TRUE);
        g_mutex_unlock(opengl->objects_lock);
 
        /* Cleanup */
@@ -465,10 +497,10 @@ static gpointer grits_opengl_add(GritsViewer *_opengl, GritsObject *object,
        g_assert(GRITS_IS_OPENGL(_opengl));
        GritsOpenGL *opengl = GRITS_OPENGL(_opengl);
        g_mutex_lock(opengl->objects_lock);
-       struct RenderLevel *level = g_tree_lookup(opengl->objects, (gpointer)key);
+       struct RenderLevel *level = g_tree_lookup(opengl->objects, (gpointer)(gintptr)key);
        if (!level) {
                level = g_new0(struct RenderLevel, 1);
-               g_tree_insert(opengl->objects, (gpointer)key, level);
+               g_tree_insert(opengl->objects, (gpointer)(gintptr)key, level);
        }
        GList *list = sort ? &level->sorted : &level->unsorted;
        /* Put the link in the list */
@@ -506,7 +538,7 @@ static GritsObject *grits_opengl_remove(GritsViewer *_opengl, GritsObject *objec
  ****************/
 static int _objects_cmp(gconstpointer _a, gconstpointer _b, gpointer _)
 {
-       gint a = (int)_a, b = (int)_b;
+       gintptr a = (gintptr)_a, b = (gintptr)_b;
        return a < b ? -1 :
               a > b ?  1 : 0;
 }
@@ -529,7 +561,8 @@ static void grits_opengl_init(GritsOpenGL *opengl)
        opengl->sphere       = roam_sphere_new(opengl);
        opengl->sphere_lock  = g_mutex_new();
        gtk_gl_enable(GTK_WIDGET(opengl));
-       g_signal_connect(opengl, "realize", G_CALLBACK(on_realize), NULL);
+       gtk_widget_add_events(GTK_WIDGET(opengl), GDK_KEY_PRESS_MASK);
+       g_signal_connect(opengl, "map", G_CALLBACK(on_realize), NULL);
 }
 static void grits_opengl_dispose(GObject *_opengl)
 {