+++ /dev/null
-/*
- * Copyright (C) 2009 Andy Spencer <spenceal@rose-hulman.edu>
- *
- * 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
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include <glib.h>
-#include <math.h>
-#include <string.h>
-#include "gpqueue.h"
-#include <GL/gl.h>
-#include <GL/glu.h>
-
-#include "roam.h"
-
-/**
- * TODO:
- * - Optimize for memory consumption
- * - Profile for computation speed
- * - Target polygon count/detail
- */
-
-/* Misc */
-RoamView *roam_view_get()
-{
- RoamView *view = g_new0(RoamView, 1);
- glGetDoublev (GL_MODELVIEW_MATRIX, view->model);
- glGetDoublev (GL_PROJECTION_MATRIX, view->proj);
- glGetIntegerv(GL_VIEWPORT, view->view);
- return view;
-}
-
-/* For GPQueue comparators */
-static gint tri_cmp(RoamTriangle *a, RoamTriangle *b, gpointer data)
-{
- if (a->error < b->error) return 1;
- else if (a->error > b->error) return -1;
- else return 0;
-}
-static gint dia_cmp(RoamDiamond *a, RoamDiamond *b, gpointer data)
-{
- if (a->error < b->error) return -1;
- else if (a->error > b->error) return 1;
- else return 0;
-}
-
-/*************
- * RoamPoint *
- *************/
-RoamPoint *roam_point_new(double x, double y, double z)
-{
- RoamPoint *self = g_new0(RoamPoint, 1);
- self->x = x;
- self->y = y;
- self->z = z;
- return self;
-}
-RoamPoint *roam_point_dup(RoamPoint *self)
-{
- RoamPoint *new = g_memdup(self, sizeof(RoamPoint));
- new->tris = 0;
- return new;
-}
-void roam_point_add_triangle(RoamPoint *self, RoamTriangle *triangle)
-{
- for (int i = 0; i < 3; i++) {
- self->norm[i] *= self->tris;
- self->norm[i] += triangle->norm[i];
- }
- self->tris++;
- for (int i = 0; i < 3; i++)
- self->norm[i] /= self->tris;
-}
-void roam_point_remove_triangle(RoamPoint *self, RoamTriangle *triangle)
-{
- for (int i = 0; i < 3; i++) {
- self->norm[i] *= self->tris;
- self->norm[i] -= triangle->norm[i];
- }
- self->tris--;
- for (int i = 0; i < 3; i++)
- self->norm[i] /= self->tris;
-}
-void roam_point_update(RoamPoint *self, RoamSphere *sphere, gboolean do_height)
-{
- if (!self->cached) {
- /* Cache height */
- if (do_height)
- sphere->height_func(self, sphere->user_data);
-
- /* Cache projection */
- gluProject(self->x, self->y, self->z,
- sphere->view->model, sphere->view->proj, sphere->view->view,
- &self->px, &self->py, &self->pz);
-
- self->cached = TRUE;
- }
-}
-void roam_point_clear(RoamPoint *self)
-{
- self->cached = FALSE;
-}
-
-/****************
- * RoamTriangle *
- ****************/
-RoamTriangle *roam_triangle_new(RoamPoint *l, RoamPoint *m, RoamPoint *r)
-{
- RoamTriangle *self = g_new0(RoamTriangle, 1);
-
- self->p.l = l;
- self->p.m = m;
- self->p.r = r;
-
- self->error = 0;
-
- /* Update normal */
- double pa[3];
- double pb[3];
- pa[0] = self->p.l->x - self->p.m->x;
- pa[1] = self->p.l->y - self->p.m->y;
- pa[2] = self->p.l->z - self->p.m->z;
-
- pb[0] = self->p.r->x - self->p.m->x;
- pb[1] = self->p.r->y - self->p.m->y;
- pb[2] = self->p.r->z - self->p.m->z;
-
- self->norm[0] = pa[1] * pb[2] - pa[2] * pb[1];
- self->norm[1] = pa[2] * pb[0] - pa[0] * pb[2];
- self->norm[2] = pa[0] * pb[1] - pa[1] * pb[0];
-
- double total = sqrt(self->norm[0] * self->norm[0] +
- self->norm[1] * self->norm[1] +
- self->norm[2] * self->norm[2]);
-
- self->norm[0] /= total;
- self->norm[1] /= total;
- self->norm[2] /= total;
-
- //g_message("roam_triangle_new: %p", self);
- return self;
-}
-
-void roam_triangle_add(RoamTriangle *self,
- RoamTriangle *left, RoamTriangle *base, RoamTriangle *right,
- RoamSphere *sphere)
-{
- self->t.l = left;
- self->t.b = base;
- self->t.r = right;
-
- roam_point_add_triangle(self->p.l, self);
- roam_point_add_triangle(self->p.m, self);
- roam_point_add_triangle(self->p.r, self);
-
- if (sphere->view)
- roam_triangle_update(self, sphere);
-
- self->handle = g_pqueue_push(sphere->triangles, self);
-}
-
-void roam_triangle_remove(RoamTriangle *self, RoamSphere *sphere)
-{
- /* Update vertex normals */
- roam_point_remove_triangle(self->p.l, self);
- roam_point_remove_triangle(self->p.m, self);
- roam_point_remove_triangle(self->p.r, self);
-
- g_pqueue_remove(sphere->triangles, self->handle);
-}
-
-void roam_triangle_sync_neighbors(RoamTriangle *new, RoamTriangle *old, RoamTriangle *neigh)
-{
- if (neigh->t.l == old) neigh->t.l = new;
- else if (neigh->t.b == old) neigh->t.b = new;
- else if (neigh->t.r == old) neigh->t.r = new;
- else g_assert_not_reached();
-}
-
-gboolean roam_point_visible(RoamPoint *self, RoamSphere *sphere)
-{
- gint *view = sphere->view->view;
- return self->px > view[0] && self->px < view[2] &&
- self->py > view[1] && self->py < view[3] &&
- self->pz > 0 && self->pz < 1;
- //double x, y, z;
- //int view[4] = {0,0,1,1};
- //gluProject(self->x, self->y, self->z,
- // sphere->view->model, sphere->view->proj, view,
- // &x, &y, &z);
- //return !(x < 0 || x > 1 ||
- // y < 0 || y > 1 ||
- // z < 0 || z > 1);
-}
-gboolean roam_triangle_visible(RoamTriangle *self, RoamSphere *sphere)
-{
- /* Do this with a bounding box */
- return roam_point_visible(self->p.l, sphere) ||
- roam_point_visible(self->p.m, sphere) ||
- roam_point_visible(self->p.r, sphere);
-}
-
-void roam_triangle_update(RoamTriangle *self, RoamSphere *sphere)
-{
- /* Update points */
- roam_point_update(self->p.l, sphere, TRUE);
- roam_point_update(self->p.m, sphere, TRUE);
- roam_point_update(self->p.r, sphere, TRUE);
-
- /* Not exactly correct, could be out on both sides (middle in) */
- if (!roam_triangle_visible(self, sphere)) {
- self->error = -1;
- } else {
- RoamPoint *l = self->p.l;
- RoamPoint *m = self->p.m;
- RoamPoint *r = self->p.r;
-
- /* TODO: share this with the base */
- RoamPoint base = { (l->x + r->x)/2,
- (l->y + r->y)/2,
- (l->z + r->z)/2 };
- RoamPoint good = base;
- roam_point_update(&base, sphere, FALSE);
- roam_point_update(&good, sphere, TRUE);
-
- self->error = sqrt((base.px - good.px) * (base.px - good.px) +
- (base.py - good.py) * (base.py - good.py));
-
- /* Multiply by size of triangle */
- double size = -( l->px * (m->py - r->py) +
- m->px * (r->py - l->py) +
- r->px * (l->py - m->py) ) / 2.0;
-
- /* Size < 0 == backface */
- self->error *= size;
- }
-}
-
-void roam_triangle_clear(RoamTriangle *self)
-{
- /* Clear points */
- roam_point_clear(self->p.l);
- roam_point_clear(self->p.m);
- roam_point_clear(self->p.r);
-}
-
-void roam_triangle_split(RoamTriangle *self, RoamSphere *sphere)
-{
- //g_message("roam_triangle_split: %p, e=%f\n", self, self->error);
-
- sphere->polys += 2;
-
- if (self != self->t.b->t.b)
- roam_triangle_split(self->t.b, sphere);
-
- RoamTriangle *base = self->t.b;
-
- /* Duplicate midpoint */
- RoamPoint *mid = roam_point_new(
- (self->p.l->x + self->p.r->x)/2,
- (self->p.l->y + self->p.r->y)/2,
- (self->p.l->z + self->p.r->z)/2);
- roam_point_update(mid, sphere, TRUE);
-
- /* Add new triangles */
- RoamTriangle *sl = roam_triangle_new(self->p.m, mid, self->p.l); // Self Left
- RoamTriangle *sr = roam_triangle_new(self->p.r, mid, self->p.m); // Self Right
- RoamTriangle *bl = roam_triangle_new(base->p.m, mid, base->p.l); // Base Left
- RoamTriangle *br = roam_triangle_new(base->p.r, mid, base->p.m); // Base Right
-
- /* tri,l, base, r, sphere */
- roam_triangle_add(sl, sr, self->t.l, br, sphere);
- roam_triangle_add(sr, bl, self->t.r, sl, sphere);
- roam_triangle_add(bl, br, base->t.l, sr, sphere);
- roam_triangle_add(br, sl, base->t.r, bl, sphere);
-
- roam_triangle_sync_neighbors(sl, self, self->t.l);
- roam_triangle_sync_neighbors(sr, self, self->t.r);
- roam_triangle_sync_neighbors(bl, base, base->t.l);
- roam_triangle_sync_neighbors(br, base, base->t.r);
-
- /* Remove old triangles */
- roam_triangle_remove(self, sphere);
- roam_triangle_remove(base, sphere);
-
- /* Add/Remove diamonds */
- RoamDiamond *diamond = roam_diamond_new(self, base, sl, sr, bl, br);
- roam_diamond_update(diamond, sphere);
- roam_diamond_add(diamond, sphere);
- roam_diamond_remove(self->parent, sphere);
- roam_diamond_remove(base->parent, sphere);
-}
-
-void roam_triangle_draw_normal(RoamTriangle *self)
-{
- double center[] = {
- (self->p.l->x + self->p.m->x + self->p.r->x)/3.0,
- (self->p.l->y + self->p.m->y + self->p.r->y)/3.0,
- (self->p.l->z + self->p.m->z + self->p.r->z)/3.0,
- };
- double end[] = {
- center[0]+self->norm[0]/2,
- center[1]+self->norm[1]/2,
- center[2]+self->norm[2]/2,
- };
- glBegin(GL_LINES);
- glVertex3dv(center);
- glVertex3dv(end);
- glEnd();
-}
-
-/***************
- * RoamDiamond *
- ***************/
-RoamDiamond *roam_diamond_new(
- RoamTriangle *parent0, RoamTriangle *parent1,
- RoamTriangle *kid0, RoamTriangle *kid1,
- RoamTriangle *kid2, RoamTriangle *kid3)
-{
- RoamDiamond *self = g_new0(RoamDiamond, 1);
-
- self->kids[0] = kid0;
- self->kids[1] = kid1;
- self->kids[2] = kid2;
- self->kids[3] = kid3;
-
- kid0->parent = self;
- kid1->parent = self;
- kid2->parent = self;
- kid3->parent = self;
-
- self->parents[0] = parent0;
- self->parents[1] = parent1;
-
- return self;
-}
-void roam_diamond_add(RoamDiamond *self, RoamSphere *sphere)
-{
- self->active = TRUE;
- self->error = MAX(self->parents[0]->error, self->parents[1]->error);
- self->handle = g_pqueue_push(sphere->diamonds, self);
-}
-void roam_diamond_remove(RoamDiamond *self, RoamSphere *sphere)
-{
- if (self && self->active) {
- self->active = FALSE;
- g_pqueue_remove(sphere->diamonds, self->handle);
- }
-}
-void roam_diamond_merge(RoamDiamond *self, RoamSphere *sphere)
-{
- //g_message("roam_diamond_merge: %p, e=%f\n", self, self->error);
-
- sphere->polys -= 2;
-
- /* TODO: pick the best split */
- RoamTriangle **kids = self->kids;
-
- /* Create triangles */
- RoamTriangle *tri = self->parents[0];
- RoamTriangle *base = self->parents[1];
-
- roam_triangle_add(tri, kids[0]->t.b, base, kids[1]->t.b, sphere);
- roam_triangle_add(base, kids[2]->t.b, tri, kids[3]->t.b, sphere);
-
- roam_triangle_sync_neighbors(tri, kids[0], kids[0]->t.b);
- roam_triangle_sync_neighbors(tri, kids[1], kids[1]->t.b);
- roam_triangle_sync_neighbors(base, kids[2], kids[2]->t.b);
- roam_triangle_sync_neighbors(base, kids[3], kids[3]->t.b);
-
- /* Remove triangles */
- roam_triangle_remove(kids[0], sphere);
- roam_triangle_remove(kids[1], sphere);
- roam_triangle_remove(kids[2], sphere);
- roam_triangle_remove(kids[3], sphere);
-
- /* Add/Remove triangles */
- if (tri->t.l->t.l == tri->t.r->t.r &&
- tri->t.l->t.l != tri && tri->parent) {
- roam_diamond_update(tri->parent, sphere);
- roam_diamond_add(tri->parent, sphere);
- }
-
- if (base->t.l->t.l == base->t.r->t.r &&
- base->t.l->t.l != base && base->parent) {
- roam_diamond_update(base->parent, sphere);
- roam_diamond_add(base->parent, sphere);
- }
-
- /* Remove and free diamond and child triangles */
- roam_diamond_remove(self, sphere);
- g_assert(self->kids[0]->p.m == self->kids[1]->p.m &&
- self->kids[1]->p.m == self->kids[2]->p.m &&
- self->kids[2]->p.m == self->kids[3]->p.m);
- g_assert(self->kids[0]->p.m->tris == 0);
- g_free(self->kids[0]->p.m);
- g_free(self->kids[0]);
- g_free(self->kids[1]);
- g_free(self->kids[2]);
- g_free(self->kids[3]);
- g_free(self);
-}
-void roam_diamond_update(RoamDiamond *self, RoamSphere *sphere)
-{
- roam_triangle_update(self->parents[0], sphere);
- roam_triangle_update(self->parents[1], sphere);
- self->error = MAX(self->parents[0]->error, self->parents[1]->error);
-}
-
-/**************
- * RoamSphere *
- **************/
-RoamSphere *roam_sphere_new(RoamTriFunc tri_func, RoamHeightFunc height_func, gpointer user_data)
-{
- RoamSphere *self = g_new0(RoamSphere, 1);
- self->tri_func = tri_func;
- self->height_func = height_func;
- self->user_data = user_data;
- self->polys = 12;
- self->triangles = g_pqueue_new((GCompareDataFunc)tri_cmp, NULL);
- self->diamonds = g_pqueue_new((GCompareDataFunc)dia_cmp, NULL);
-
- RoamPoint *vertexes[] = {
- roam_point_new( 1, 1, 1), // 0
- roam_point_new( 1, 1,-1), // 1
- roam_point_new( 1,-1, 1), // 2
- roam_point_new( 1,-1,-1), // 3
- roam_point_new(-1, 1, 1), // 4
- roam_point_new(-1, 1,-1), // 5
- roam_point_new(-1,-1, 1), // 6
- roam_point_new(-1,-1,-1), // 7
- };
- int _triangles[][2][3] = {
- /*lv mv rv ln, bn, rn */
- {{3,2,0}, {10, 1, 7}}, // 0
- {{0,1,3}, { 9, 0, 2}}, // 1
- {{7,3,1}, {11, 3, 1}}, // 2
- {{1,5,7}, { 8, 2, 4}}, // 3
- {{6,7,5}, {11, 5, 3}}, // 4
- {{5,4,6}, { 8, 4, 6}}, // 5
- {{2,6,4}, {10, 7, 5}}, // 6
- {{4,0,2}, { 9, 6, 0}}, // 7
- {{4,5,1}, { 5, 9, 3}}, // 8
- {{1,0,4}, { 1, 8, 7}}, // 9
- {{6,2,3}, { 6,11, 0}}, // 10
- {{3,7,6}, { 2,10, 4}}, // 11
- };
- RoamTriangle *triangles[12];
-
- for (int i = 0; i < 12; i++)
- triangles[i] = roam_triangle_new(
- vertexes[_triangles[i][0][0]],
- vertexes[_triangles[i][0][1]],
- vertexes[_triangles[i][0][2]]);
- for (int i = 0; i < 12; i++)
- roam_triangle_add(triangles[i],
- triangles[_triangles[i][1][0]],
- triangles[_triangles[i][1][1]],
- triangles[_triangles[i][1][2]],
- self);
-
- return self;
-}
-void roam_sphere_update(RoamSphere *self)
-{
- g_debug("RoamSphere: update - polys=%d", self->polys);
- if (self->view) g_free(self->view);
- self->view = roam_view_get();
-
- GPtrArray *tris = g_pqueue_get_array(self->triangles);
- GPtrArray *dias = g_pqueue_get_array(self->diamonds);
-
- for (int i = 0; i < tris->len; i++) {
- /* Note: this also updates points */
- RoamTriangle *tri = tris->pdata[i];
- roam_triangle_clear(tri);
- roam_triangle_update(tri, self);
- g_pqueue_priority_changed(self->triangles, tri->handle);
- }
-
- for (int i = 0; i < dias->len; i++) {
- RoamDiamond *dia = dias->pdata[i];
- roam_diamond_update(dia, self);
- g_pqueue_priority_changed(self->diamonds, dia->handle);
- }
-
- g_ptr_array_free(tris, TRUE);
- g_ptr_array_free(dias, TRUE);
-}
-
-void roam_sphere_split_one(RoamSphere *self)
-{
- RoamTriangle *to_split = g_pqueue_peek(self->triangles);
- if (!to_split) return;
- roam_triangle_split(to_split, self);
-}
-void roam_sphere_merge_one(RoamSphere *self)
-{
- RoamDiamond *to_merge = g_pqueue_peek(self->diamonds);
- if (!to_merge) return;
- roam_diamond_merge(to_merge, self);
-}
-gint roam_sphere_split_merge(RoamSphere *self)
-{
- gint iters = 0, max_iters = 500;
- gint target = 2000;
-
- if (!self->view)
- return 0;
-
- if (target - self->polys > 100)
- while (self->polys < target && iters++ < max_iters)
- roam_sphere_split_one(self);
-
- if (self->polys - target > 100)
- while (self->polys > target && iters++ < max_iters)
- roam_sphere_merge_one(self);
-
- while (((RoamTriangle*)g_pqueue_peek(self->triangles))->error >
- ((RoamDiamond *)g_pqueue_peek(self->diamonds ))->error &&
- iters++ < max_iters) {
- roam_sphere_merge_one(self);
- roam_sphere_split_one(self);
- }
-
- return iters;
-}
-void roam_sphere_draw(RoamSphere *self)
-{
- g_pqueue_foreach(self->triangles, (GFunc)self->tri_func, self->user_data);
-}
-void roam_sphere_draw_normals(RoamSphere *self)
-{
- g_pqueue_foreach(self->triangles, (GFunc)roam_triangle_draw_normal, NULL);
-}
-static void roam_sphere_free_tri(RoamTriangle *tri)
-{
- if (--tri->p.l->tris == 0) g_free(tri->p.l);
- if (--tri->p.m->tris == 0) g_free(tri->p.m);
- if (--tri->p.r->tris == 0) g_free(tri->p.r);
- g_free(tri);
-}
-void roam_sphere_free(RoamSphere *self)
-{
- /* Slow method, but it should work */
- while (self->polys > 12)
- roam_sphere_merge_one(self);
- /* TODO: free points */
- g_pqueue_foreach(self->triangles, (GFunc)roam_sphere_free_tri, NULL);
- g_pqueue_free(self->triangles);
- g_pqueue_free(self->diamonds);
- g_free(self);
-}
projects / aweather / blobdiff