--- libgender/oct.C 2004/10/03 20:14:33 1.5 +++ libgender/oct.C 2005/01/06 03:09:24 1.87 @@ -1,97 +1,417 @@ #include +#include +using namespace std; + +#include "opengl.h" + #include "oct.h" +#include "view.h" #include "entity.h" -octant world(0, 0); +enum visibility_state { FULL, PARTIAL, OCCLUDED }; + +struct evis { + entity *e; + visibility_state state; + double last; // time of last check + + void clear () + { + last = 0.; + state = FULL; + } + + evis () + { + clear (); + } +}; + +struct oct_visibility : visibility_base +{ + vector vismap; + + visibility_state state; + + evis &get_visibility (int i, entity *e) + { + evis &evs = vismap [i]; + + if (evs.e != e) + { + evs.clear (); + evs.e = e; + } -octant::octant (octant *parent, int subindex) + return evs; + } + + oct_visibility (octant &oct) + : state(FULL) + { + } +}; + +octant world(0, sector (0, 0, 0), MAXEXTENT); + +octant::octant (octant *parent, const sector &orig, uoffs extent) : parent(parent) +, orig(orig) +, extent(extent) { for (fill = 8; fill--; ) sub[fill] = 0; +} + +visibility_base *octant::new_visibility () +{ + return new oct_visibility (*this); +} + +void octant::clear_visibility (visibility_base *vs) +{ + ((oct_visibility *)vs)->vismap.clear (); + ((oct_visibility *)vs)->state = FULL; +} + +octant::~octant () +{ + for (fill = 8; fill--; ) + delete sub[fill]; +} + +static bool overlap (const sector &orig, uoffs extent, const sector &a, const sector &b) +{ + sector size = (b - a + 1) >> 1; + sector center = a + size; + + return abs (orig - center) <= extent + size; +} + +static sector offset (const sector &s, int subindex, uoffs extent) +{ + return sector ( + s.x + (subindex & 1 ? extent : -extent), + s.y + (subindex & 2 ? extent : -extent), + s.z + (subindex & 4 ? extent : -extent) + ); +} - if (parent) +void octant::add (entity *e) +{ + const sector &a = e->a; + const sector &b = e->b; + + uoffs size = max (abs (b - a)); + + if (size >= extent >> 4) { - extent = (parent->extent + 1) >> 1; - orig = parent->orig; - orig.offset (subindex, extent); + if (overlap (orig, extent, a, b)) + { + push_back (e); + e->o.push_back (this); + } } else { - extent = MAXEXTENT; - orig.x = orig.y = orig.z = SOFFS_MIN; + uoffs extent2 = extent >> 1; + + for (int i = 8; i--; ) + { + sector s = offset (orig, i, extent2); + + if (overlap (s, extent2, a, b)) + { + if (!sub[i]) + { + sub[i] = new octant (this, s, extent2); + fill++; + } + + sub[i]->add (e); + } + } } } -octant::~octant () +void octant::remove (entity *e) { - for (fill = 8; fill--; ) - delete sub[fill]; } -static bool overlap (const sector &o1, uoffs ea, const sector &o2, const box &bbox) +bool octant::detect_visibility (view &ctx) //, bool fully_visible) { - sector a2; + ctx.stat1++;//D + + sector centeri = orig - ctx.orig; + point centerf = point (centeri); + + GLfloat rad = ctx.diagfact * extent; - ea /= 2; + if (!overlap (ctx.frustum.c, sphere (centerf, rad))) + return false; - a2.x = o1.x + ea; - a2.y = o1.y + ea; - a2.z = o1.z + ea; - - sector b2; - sector eb; + oct_visibility &vs = *(oct_visibility *)get_visibility (ctx); - b2.x = o2.x + (soffs)bbox.a.x; - b2.y = o2.y + (soffs)bbox.a.y; - b2.z = o2.z + (soffs)bbox.a.z; + //vs.state = FULL;//D - eb.x = (soffs)(bbox.b.x - bbox.a.x) / 2; - eb.y = (soffs)(bbox.b.y - bbox.a.y) / 2; - eb.z = (soffs)(bbox.b.z - bbox.a.z) / 2; +#if 0 + if (max (abs (centeri)) <= extent) + ; + else + { +#endif - b2.x += eb.x; - b2.y += eb.y; - b2.z += eb.z; + //if (distance (ctx.frustum.t, centerf) < -rad) return false; + //if (distance (ctx.frustum.b, centerf) < -rad) return false; + //if (distance (ctx.frustum.l, centerf) < -rad) return false; + //if (distance (ctx.frustum.r, centerf) < -rad) return false; + ////if (distance (ctx.frustum.n, centerf) < -rad) return false; + +#if 0 + GLfloat fd = distance (ctx.frustum.f, centerf); + + if (fd < -(ctx.c_far - ctx.z_far) -rad * 3.F) + return false; +#endif - return abs (a2.x - b2.x) <= ea + eb.x - && abs (a2.y - b2.y) <= ea + eb.y - && abs (a2.z - b2.z) <= ea + eb.z; + // very important, optimize? + GLfloat z = length (ctx.p - centerf) + rad; + if (z < 0.F || ctx.perspfact * extent / z < 10.) // very crude "too small to see" check + return false; + +#if 0 + if (vs.state == PARTIAL || vs.state == FULL) + ctx.nc_far = max (ctx.nc_far, z); +#endif + + if (vs.state == OCCLUDED) + { +#if 0 + if (extent < ctx.z_far) + { +#endif + ctx.postdepthlist.push_back (this); + return false; +#if 0 + } + else + vs.state == PARTIAL; +#endif + } + + bool visible = size () && vs.state == FULL; + + // node to start with + unsigned char si = centeri.x > 0 ? 1 : 0 + | centeri.y > 0 ? 2 : 0 + | centeri.z > 0 ? 4 : 0; + + // bit-toggle to find next child for front-to-back order + static unsigned char toggle[8+1] + = { 0, 0^1, 1^2, 2^4, 4^3, 3^5, 5^6, 6^7, 0 }; + + unsigned char *next = toggle; + do + { + si ^= *next; + + if (sub[si]) + visible = visible | sub[si]->detect_visibility (ctx); + } + while (*++next); + + if (visible) + { + if (size ()) + ctx.vislist.push_back (this); + + ctx.postdepthlist.push_back (this); + } + else + { + //vs.state = OCCLUDED; + ctx.postdepthlist.push_back (this); + } + + return visible; } -void octant::add (const sector &sec, entity_base *e) +void octant::draw_depth (view &ctx) { - printf ("OCTANT %d,%d,%d+%d\n", orig.x, orig.y, orig.z, extent); + oct_visibility &vs = *(oct_visibility *)get_visibility (ctx); + + vs.vismap.resize (size ()); + + if (vs.state == PARTIAL || vs.state == OCCLUDED) + return; - if (overlap (orig, extent, sec, e->bbox)) + for (int i = 0; i < size (); ++i) { - printf ("overlap, add\n"); - push_back (e); - e->o.push_back (this); + entity *e = (*this)[i]; + const evis &evs = vs.get_visibility (i, e); -#if 0 - uoffs extent2 = extent / 2; - for (int si = 8; i--; ) + if (evs.state != OCCLUDED) + { + if (!ctx.may_draw (e)) + continue; + + sector center = ((e->a + e->b) >> 1) - ctx.orig; + GLfloat z = length (vec3 (center)); + ctx.pixfact = ctx.perspfact / z; + + ctx.nz_far = max (ctx.nz_far, z + extent); + ctx.nz_near = min (ctx.nz_near, z - extent); + + e->draw (ctx); + } + } +} + +void octant::draw_postdepth (view &ctx) +{ + oct_visibility &vs = *(oct_visibility *)get_visibility (ctx); + + if (vs.state == PARTIAL || vs.state == OCCLUDED) + { + ctx.begin_occ_query (*this, 0); + sector s = orig - ctx.orig; + gl::draw_bbox (s - extent, s + extent); + ctx.end_occ_query (); + } + else + { + int nvis = 0; + + for (int i = 0; i < size (); ++i) { - sector sub = orig; - sub.offset (si, extent2); - if (overlap (sub, extent2, sec, e->bbox)) + entity *e = (*this)[i]; + const evis &evs = vs.get_visibility (i, e); + + if (evs.state == OCCLUDED) { + if (!ctx.may_draw (e)) + continue; + + ctx.begin_occ_query (*this, e); + gl::draw_bbox (e->a - ctx.orig, e->b - ctx.orig); + ctx.end_occ_query (); } + else + nvis++; + } + +#if 0 + if (nvis == 0 && size ()) + vs.state = PARTIAL; #endif } - else - printf ("no overlap\n"); } -void octant::remove (entity_base *e) +void octant::draw_lighted (view &ctx) { + oct_visibility &vs = *(oct_visibility *)get_visibility (ctx); + +#if 0 + if (vs.state == PARTIAL || vs.state == OCCLUDED) + { + sector s = orig - ctx.orig; + gl::draw_bbox (s - extent, s + extent); + printf ("DLP %p\n", this);//D + } +#endif + + if (vs.state == PARTIAL || vs.state == OCCLUDED) + return; + +#if 0 + { + static vertex_buffer vb; + static index_buffer ib; + + sector s = orig - ctx.orig; + sector a = s - extent, b = s + extent; + + vertex_v3f vd[] = { + point (a.x, a.y, a.z), + point (b.x, a.y, a.z), + point (a.x, b.y, a.z), + point (b.x, b.y, a.z), + point (a.x, a.y, b.z), + point (b.x, a.y, b.z), + point (a.x, b.y, b.z), + point (b.x, b.y, b.z), + }; + + if (!ib) + { + static GLushort verts[4*6] = { + 0, 4, 6, 2, // -x + 1, 3, 7, 5, // +x + 0, 1, 5, 4, // -y + 7, 3, 2, 6, // +y + 0, 2, 3, 1, // -z + 4, 5, 7, 6, // +z + }; + + ib.set (verts, 4*6, GL_STATIC_DRAW_ARB); + } + + vb.set (vd, 8, GL_STREAM_DRAW_ARB); + vb.bind (); + for (int i = 0; i < 6; i++) + ib.draw (GL_LINE_LOOP, i*4, 4); + + } +#endif + + for (int i = 0; i < size (); ++i) + { + entity *e = (*this)[i]; + evis &evs = vs.get_visibility (i, e); + + if (evs.state != OCCLUDED) + { + if (!ctx.may_draw (e)) + continue; + + sector center = ((e->a + e->b) >> 1) - ctx.orig; + GLfloat z = length (vec3 (center)); + ctx.pixfact = ctx.perspfact / z; + + if (ctx.pass->type != LIGHTED + || !ctx.first_lighted + || evs.last + 1. > timer.now) + e->draw (ctx); + else + { + evs.last = timer.now; + ctx.begin_occ_query (*this, e); + e->draw (ctx); + ctx.end_occ_query (); + } + } + } } -void octant::draw (draw_context &ctx) +void octant::event (occ_query &ev) { - for (iterator i = end (); i-- != begin (); ) - (*i)->display (ctx); + oct_visibility &vs = *(oct_visibility *)get_visibility (ev.ctx); + entity *e = (entity *)ev.id; + + if (e) + { + for (vector::iterator i = vs.vismap.begin (); + i != vs.vismap.end (); + ++i) + if (i->e == e) + { + i->state = ev.count ? FULL : OCCLUDED; + return; + } + } + else + vs.state = ev.count ? (vs.state == PARTIAL ? PARTIAL : FULL) : OCCLUDED; } +