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