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#include <cstdlib> |
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|
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#include <vector> |
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using namespace std; |
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|
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#include "opengl.h" |
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|
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#include "oct.h" |
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#include "view.h" |
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#include "entity.h" |
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|
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enum visibility_state { FULL, PARTIAL, SMALL, OCCLUDED }; |
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|
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struct evis { |
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visibility_state state; |
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double last; // time of last check |
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evis () : last(0.), state(FULL) { }; |
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}; |
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|
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struct oct_visibility : visibility_base |
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{ |
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typedef map<entity *, evis> evismap; |
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evismap vismap; |
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|
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visibility_state state; |
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|
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oct_visibility (octant &oct) |
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: state(FULL) |
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{ |
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} |
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}; |
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|
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octant world(0, sector (SOFFS_MIN, SOFFS_MIN, SOFFS_MIN), MAXEXTENT); |
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|
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octant::octant (octant *parent, const sector &orig, uoffs extent) |
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: parent(parent) |
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, orig(orig) |
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, extent(extent) |
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{ |
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for (fill = 8; fill--; ) |
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sub[fill] = 0; |
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} |
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|
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visibility_base *octant::new_visibility () |
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{ |
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return new oct_visibility (*this); |
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} |
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|
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void octant::clear_visibility (visibility_base *vs) |
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{ |
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((oct_visibility *)vs)->vismap.clear (); |
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} |
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|
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octant::~octant () |
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{ |
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for (fill = 8; fill--; ) |
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delete sub[fill]; |
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} |
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|
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static bool overlap (const sector &o1, uoffs ea, const sector &a, const sector &b) |
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{ |
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ea /= 2; |
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|
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sector center_1 = o1 + ea; |
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sector size_2 = b - a; |
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sector center_2 = a + (size_2 >> 1); |
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|
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return abs (center_1 - center_2) <= ea + size_2; |
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} |
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|
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void octant::add (entity *e) |
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{ |
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const sector &a = e->a; |
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const sector &b = e->b; |
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|
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if (overlap (orig, extent, a, b)) |
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{ |
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uoffs extent2 = extent >> 1; |
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uoffs size = max (abs (b - a)); |
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|
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if (size >= extent2 >> 1) |
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{ |
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push_back (e); |
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e->o.push_back (this); |
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return; |
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} |
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|
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for (int i = 8; i--; ) |
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{ |
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sector s = orig; |
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s.offset (i, extent2); |
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|
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if (overlap (s, extent2, a, b)) |
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{ |
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if (!sub[i]) |
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{ |
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sub[i] = new octant (this, s, extent2); |
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fill++; |
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} |
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|
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sub[i]->add (e); |
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} |
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} |
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} |
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} |
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|
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void octant::remove (entity *e) |
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{ |
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} |
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|
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bool octant::detect_visibility (view &ctx) |
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{ |
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GLfloat extent2 = 0.5F * (GLfloat)extent; |
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sector centeri = orig + (extent >> 1) - ctx.orig; |
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point centerf = point (centeri) + ((extent & 1) ? 0.5F : 0.F); |
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|
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GLfloat rad = ctx.diagfact * extent2; |
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|
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if (!overlap (ctx.frustum.c, sphere (centerf, rad))) |
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return false; |
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|
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oct_visibility &vs = *(oct_visibility *)get_visibility (ctx); |
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|
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if (orig <= ctx.orig && ctx.orig <= orig + extent) |
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vs.state = PARTIAL; |
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else |
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{ |
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if (distance (ctx.frustum.t, centerf) < -rad) return false; |
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if (distance (ctx.frustum.b, centerf) < -rad) return false; |
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if (distance (ctx.frustum.l, centerf) < -rad) return false; |
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if (distance (ctx.frustum.r, centerf) < -rad) return false; |
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if (distance (ctx.frustum.n, centerf) < -rad) return false; |
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|
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#if 0 |
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GLfloat fd = distance (ctx.frustum.f, centerf); |
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|
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if (fd < -(ctx.c_far - ctx.z_far) -rad * 3.F) |
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return false; |
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#endif |
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} |
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|
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#if 0 |
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if (vs.state == OCCLUDED && size ()) |
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{ |
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if (size ()) |
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ctx.vislist.push_back (this); |
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return false; |
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} |
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#endif |
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|
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GLfloat z = ctx.z_near + distance (ctx.frustum.n, centerf) + rad; |
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if (ctx.perspfact * extent / z < 1.) // very crude "too small to see" check |
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return false; |
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//printf ("z %f, perspfact %f, z*p %f\n", z, ctx.perspfact, ctx.perspfact / z); |
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|
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#if 0 |
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if (vs.state == PARTIAL || vs.state == FULL) |
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ctx.nc_far = max (ctx.nc_far, z); |
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#endif |
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|
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// node to start with |
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unsigned char si = centeri.x > 0 ? 1 : 0 |
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| centeri.y > 0 ? 2 : 0 |
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| centeri.z > 0 ? 4 : 0; |
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|
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// bit-toggle to find next child for front-to-back order |
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static unsigned char toggle[8+1] |
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= { 0, 0^1, 1^2, 2^4, 4^3, 3^5, 5^6, 6^7, 0 }; |
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|
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bool visible = vs.state == PARTIAL || vs.state == FULL; |
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|
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unsigned char *next = toggle; |
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do |
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{ |
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si ^= *next; |
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|
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if (sub[si]) |
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visible = visible | sub[si]->detect_visibility (ctx); |
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} |
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while (*++next); |
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|
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if (size ()) |
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ctx.vislist.push_back (this); |
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|
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return visible; |
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} |
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|
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void octant::display (view &ctx) |
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{ |
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oct_visibility &vs = *(oct_visibility *)get_visibility (ctx); |
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|
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if (vs.state == OCCLUDED) |
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{ |
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if (ctx.pass == view::POSTDEPTH) |
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{ |
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ctx.begin_occ_query (*this, 0); |
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sector s = orig - ctx.orig; |
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gl::draw_bbox (s, s + extent); |
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ctx.end_occ_query (); |
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} |
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} |
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else |
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{ |
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int nvis = 0; |
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|
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for (iterator i = begin (); i != end (); ) |
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{ |
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entity *e = *i++; |
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|
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evis &evs = vs.vismap[e]; |
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|
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if (ctx.pass == view::POSTDEPTH) |
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{ |
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if (evs.state == OCCLUDED) |
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{ |
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ctx.begin_occ_query (*this, e); |
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gl::draw_bbox (e->a - ctx.orig, e->b - ctx.orig); |
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ctx.end_occ_query (); |
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} |
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else |
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nvis++; |
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} |
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else |
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{ |
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if (!ctx.may_draw (e)) |
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continue; |
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|
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|
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if (evs.state != OCCLUDED) |
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{ |
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sector center = ((e->a + e->b) >> 1) - ctx.orig; |
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GLfloat z = length (vec3 (center)); |
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ctx.pixfact = ctx.perspfact / z; |
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|
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ctx.nz_far = max (ctx.nz_far, z + extent); |
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ctx.nz_near = min (ctx.nz_near, z - extent); |
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|
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if (ctx.pass == view::DEPTH || evs.last + 0.3 > timer.now) |
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e->draw (ctx); |
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else |
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{ |
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evs.last = timer.now; |
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ctx.begin_occ_query (*this, e); |
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e->draw (ctx); |
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ctx.end_occ_query (); |
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} |
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} |
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} |
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} |
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|
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#if 1 |
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if (ctx.pass == view::POSTDEPTH && nvis == 0 && size ()) |
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vs.state = OCCLUDED; |
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#endif |
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} |
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} |
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|
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void octant::event (occ_query &ev) |
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{ |
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oct_visibility &vs = *(oct_visibility *)get_visibility (ev.ctx); |
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entity *e = (entity *)ev.id; |
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|
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if (e) |
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{ |
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evis &evs = vs.vismap[e]; |
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evs.state = ev.count ? FULL : OCCLUDED; |
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} |
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else |
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vs.state = ev.count ? FULL : OCCLUDED; |
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} |
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|
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