mirror of
https://github.com/Relintai/pandemonium_engine.git
synced 2024-12-29 15:17:11 +01:00
316 lines
9.8 KiB
C++
316 lines
9.8 KiB
C++
#ifndef PORTAL_OCCLUSION_CULLER_H
|
|
#define PORTAL_OCCLUSION_CULLER_H
|
|
/*************************************************************************/
|
|
/* portal_occlusion_culler.h */
|
|
/*************************************************************************/
|
|
/* This file is part of: */
|
|
/* GODOT ENGINE */
|
|
/* https://godotengine.org */
|
|
/*************************************************************************/
|
|
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
|
|
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
|
|
/* */
|
|
/* Permission is hereby granted, free of charge, to any person obtaining */
|
|
/* a copy of this software and associated documentation files (the */
|
|
/* "Software"), to deal in the Software without restriction, including */
|
|
/* without limitation the rights to use, copy, modify, merge, publish, */
|
|
/* distribute, sublicense, and/or sell copies of the Software, and to */
|
|
/* permit persons to whom the Software is furnished to do so, subject to */
|
|
/* the following conditions: */
|
|
/* */
|
|
/* The above copyright notice and this permission notice shall be */
|
|
/* included in all copies or substantial portions of the Software. */
|
|
/* */
|
|
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
|
|
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
|
|
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
|
|
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
|
|
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
|
|
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
|
|
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
|
|
/*************************************************************************/
|
|
|
|
class PortalRenderer;
|
|
#include "core/math/projection.h"
|
|
#include "core/math/geometry.h"
|
|
#include "portal_types.h"
|
|
|
|
class PortalOcclusionCuller {
|
|
enum {
|
|
MAX_SPHERES = 64,
|
|
MAX_POLYS = 64,
|
|
};
|
|
|
|
class Clipper {
|
|
public:
|
|
real_t clip_and_find_poly_area(const Plane *p_verts, int p_num_verts);
|
|
|
|
private:
|
|
enum Boundary {
|
|
B_LEFT,
|
|
B_RIGHT,
|
|
B_TOP,
|
|
B_BOTTOM,
|
|
B_NEAR,
|
|
B_FAR,
|
|
};
|
|
|
|
bool is_inside(const Plane &p_pt, Boundary p_boundary);
|
|
Plane intersect(const Plane &p_a, const Plane &p_b, Boundary p_boundary);
|
|
void debug_print_points(String p_string);
|
|
|
|
Plane interpolate(const Plane &p_a, const Plane &p_b, real_t p_t) const;
|
|
bool clip_to_plane(real_t a, real_t b, real_t c, real_t d);
|
|
|
|
LocalVectori<Plane> _pts_in;
|
|
LocalVectori<Plane> _pts_out;
|
|
|
|
// after perspective divide
|
|
LocalVectori<Vector3> _pts_final;
|
|
|
|
template <typename T>
|
|
int sgn(T val) {
|
|
return (T(0) < val) - (val < T(0));
|
|
}
|
|
};
|
|
|
|
public:
|
|
PortalOcclusionCuller();
|
|
|
|
void prepare_camera(const Projection &p_cam_matrix, const Vector3 &p_cam_dir) {
|
|
_matrix_camera = p_cam_matrix;
|
|
_pt_cam_dir = p_cam_dir;
|
|
}
|
|
|
|
void prepare(PortalRenderer &p_portal_renderer, const VSRoom &p_room, const Vector3 &pt_camera, const LocalVector<Plane> &p_planes, const Plane *p_near_plane) {
|
|
if (p_near_plane) {
|
|
static LocalVector<Plane> local_planes;
|
|
int size_wanted = p_planes.size() + 1;
|
|
|
|
if ((int)local_planes.size() != size_wanted) {
|
|
local_planes.resize(size_wanted);
|
|
}
|
|
for (int n = 0; n < (int)p_planes.size(); n++) {
|
|
local_planes[n] = p_planes[n];
|
|
}
|
|
local_planes[size_wanted - 1] = *p_near_plane;
|
|
|
|
prepare_generic(p_portal_renderer, p_room._occluder_pool_ids, pt_camera, local_planes);
|
|
} else {
|
|
prepare_generic(p_portal_renderer, p_room._occluder_pool_ids, pt_camera, p_planes);
|
|
}
|
|
}
|
|
|
|
void prepare_generic(PortalRenderer &p_portal_renderer, const LocalVector<uint32_t, uint32_t> &p_occluder_pool_ids, const Vector3 &pt_camera, const LocalVector<Plane> &p_planes);
|
|
|
|
bool cull_aabb(const AABB &p_aabb) const {
|
|
if (!_occluders_present) {
|
|
return false;
|
|
}
|
|
if (cull_aabb_to_polys(p_aabb)) {
|
|
return true;
|
|
}
|
|
|
|
return cull_sphere(p_aabb.get_center(), p_aabb.size.length() * 0.5, -1, false);
|
|
}
|
|
|
|
bool cull_sphere(const Vector3 &p_occludee_center, real_t p_occludee_radius, int p_ignore_sphere = -1, bool p_cull_to_polys = true) const;
|
|
|
|
Geometry::MeshData debug_get_current_polys() const;
|
|
|
|
static bool _redraw_gizmo;
|
|
|
|
private:
|
|
bool cull_sphere_to_spheres(const Vector3 &p_occludee_center, real_t p_occludee_radius, const Vector3 &p_ray_dir, real_t p_dist_to_occludee, int p_ignore_sphere) const;
|
|
bool cull_sphere_to_polys(const Vector3 &p_occludee_center, real_t p_occludee_radius) const;
|
|
bool cull_aabb_to_polys(const AABB &p_aabb) const;
|
|
|
|
// experimental
|
|
bool cull_aabb_to_polys_ex(const AABB &p_aabb) const;
|
|
bool _is_poly_of_interest_to_split_plane(const Plane *p_poly_split_plane, int p_poly_id) const;
|
|
|
|
// if a sphere is entirely in front of any of the culling planes, it can't be seen so returns false
|
|
bool is_sphere_culled(const Vector3 &p_pos, real_t p_radius, const LocalVector<Plane> &p_planes) const {
|
|
for (unsigned int p = 0; p < p_planes.size(); p++) {
|
|
real_t dist = p_planes[p].distance_to(p_pos);
|
|
if (dist > p_radius) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool is_aabb_culled(const AABB &p_aabb, const LocalVector<Plane> &p_planes) const {
|
|
const Vector3 &size = p_aabb.size;
|
|
Vector3 half_extents = size * 0.5;
|
|
Vector3 ofs = p_aabb.position + half_extents;
|
|
|
|
for (unsigned int i = 0; i < p_planes.size(); i++) {
|
|
const Plane &p = p_planes[i];
|
|
Vector3 point(
|
|
(p.normal.x > 0) ? -half_extents.x : half_extents.x,
|
|
(p.normal.y > 0) ? -half_extents.y : half_extents.y,
|
|
(p.normal.z > 0) ? -half_extents.z : half_extents.z);
|
|
point += ofs;
|
|
if (p.is_point_over(point)) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool calculate_poly_goodness_of_fit(const VSOccluder_Poly &p_opoly, real_t &r_fit);
|
|
void whittle_polys();
|
|
void precalc_poly_edge_planes(const Vector3 &p_pt_camera);
|
|
|
|
// If all the points of the poly are beyond one of the planes (e.g. frustum), it is completely culled.
|
|
bool is_poly_culled(const Occlusion::PolyPlane &p_opoly, const LocalVector<Plane> &p_planes) const {
|
|
for (unsigned int p = 0; p < p_planes.size(); p++) {
|
|
const Plane &plane = p_planes[p];
|
|
|
|
int points_outside = 0;
|
|
for (int n = 0; n < p_opoly.num_verts; n++) {
|
|
const Vector3 &pt = p_opoly.verts[n];
|
|
if (!plane.is_point_over(pt)) {
|
|
break;
|
|
} else {
|
|
points_outside++;
|
|
}
|
|
}
|
|
|
|
if (points_outside == p_opoly.num_verts) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// All the points of the poly must be within ALL the planes to return true.
|
|
struct PlaneSet;
|
|
bool is_poly_inside_occlusion_volume(const Occlusion::Poly &p_test_poly, const Plane &p_occluder_plane, const PlaneSet &p_planeset) const {
|
|
// first test against the occluder poly plane
|
|
for (int n = 0; n < p_test_poly.num_verts; n++) {
|
|
const Vector3 &pt = p_test_poly.verts[n];
|
|
if (p_occluder_plane.is_point_over(pt)) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
for (int p = 0; p < p_planeset.num_planes; p++) {
|
|
const Plane &plane = p_planeset.planes[p];
|
|
|
|
for (int n = 0; n < p_test_poly.num_verts; n++) {
|
|
const Vector3 &pt = p_test_poly.verts[n];
|
|
if (plane.is_point_over(pt)) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool is_poly_touching_hole(const Occlusion::Poly &p_opoly, const PlaneSet &p_planeset) const {
|
|
if (!p_opoly.num_verts) {
|
|
// should not happen?
|
|
return false;
|
|
}
|
|
// find aabb
|
|
AABB bb;
|
|
bb.position = p_opoly.verts[0];
|
|
for (int n = 1; n < p_opoly.num_verts; n++) {
|
|
bb.expand_to(p_opoly.verts[n]);
|
|
}
|
|
|
|
// if the AABB is totally outside any edge, it is safe for a hit
|
|
real_t omin, omax;
|
|
|
|
for (int e = 0; e < p_planeset.num_planes; e++) {
|
|
// edge plane to camera
|
|
const Plane &plane = p_planeset.planes[e];
|
|
bb.project_range_in_plane(plane, omin, omax);
|
|
|
|
// if inside the hole, no longer a hit on this poly
|
|
if (omin > 0.0) {
|
|
return false;
|
|
}
|
|
} // for e
|
|
|
|
return true;
|
|
}
|
|
|
|
void log(String p_string, int p_depth = 0) const;
|
|
|
|
// only a number of the spheres in the scene will be chosen to be
|
|
// active based on their distance to the camera, screen space etc.
|
|
Occlusion::Sphere _spheres[MAX_SPHERES];
|
|
real_t _sphere_distances[MAX_SPHERES];
|
|
real_t _sphere_closest_dist = 0.0;
|
|
int _num_spheres = 0;
|
|
int _max_spheres = 8;
|
|
|
|
struct SortPoly {
|
|
enum SortPolyFlags {
|
|
SPF_FACES_CAMERA = 1,
|
|
SPF_DONE = 2,
|
|
SPF_TESTED_AS_OCCLUDER = 4,
|
|
SPF_HAS_HOLES = 8,
|
|
};
|
|
|
|
Occlusion::PolyPlane poly;
|
|
uint32_t flags;
|
|
#ifdef TOOLS_ENABLED
|
|
uint32_t poly_source_id;
|
|
#endif
|
|
uint32_t mesh_source_id;
|
|
real_t goodness_of_fit;
|
|
};
|
|
|
|
struct PlaneSet {
|
|
void flip() {
|
|
for (int n = 0; n < num_planes; n++) {
|
|
planes[n] = -planes[n];
|
|
}
|
|
}
|
|
// pre-calculated edge planes to the camera
|
|
int num_planes = 0;
|
|
Plane planes[PortalDefines::OCCLUSION_POLY_MAX_VERTS];
|
|
};
|
|
|
|
struct PreCalcedPoly {
|
|
void flip() {
|
|
edge_planes.flip();
|
|
for (int n = 0; n < num_holes; n++) {
|
|
hole_edge_planes[n].flip();
|
|
}
|
|
}
|
|
int num_holes = 0;
|
|
PlaneSet edge_planes;
|
|
PlaneSet hole_edge_planes[PortalDefines::OCCLUSION_POLY_MAX_HOLES];
|
|
Occlusion::Poly hole_polys[PortalDefines::OCCLUSION_POLY_MAX_HOLES];
|
|
};
|
|
|
|
SortPoly _polys[MAX_POLYS];
|
|
PreCalcedPoly _precalced_poly[MAX_POLYS];
|
|
int _num_polys = 0;
|
|
int _max_polys = 8;
|
|
|
|
#ifdef TOOLS_ENABLED
|
|
uint32_t _poly_checksum = 0;
|
|
#endif
|
|
|
|
Vector3 _pt_camera;
|
|
Vector3 _pt_cam_dir;
|
|
|
|
Projection _matrix_camera;
|
|
PortalRenderer *_portal_renderer = nullptr;
|
|
|
|
Clipper _clipper;
|
|
|
|
bool _occluders_present = false;
|
|
|
|
static bool _debug_log;
|
|
};
|
|
|
|
#endif // PORTAL_OCCLUSION_CULLER_H
|