From e7984246c375a93755c74fe78e4c254a8931533d Mon Sep 17 00:00:00 2001 From: Sam Hocevar Date: Fri, 6 Mar 2020 12:35:15 +0100 Subject: [PATCH] =?UTF-8?q?Move=20portal.h=20to=20legacy=20directory;=20I?= =?UTF-8?q?=20don=E2=80=99t=20know=20what=20to=20do=20with=20it.?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- TODO.md | 5 +- legacy/lol/algorithm/portal.h | 392 ++++++++++++++++++++++++++++++++++ 2 files changed, 393 insertions(+), 4 deletions(-) create mode 100644 legacy/lol/algorithm/portal.h diff --git a/TODO.md b/TODO.md index 1423791e..32077412 100644 --- a/TODO.md +++ b/TODO.md @@ -10,9 +10,9 @@ ## headers we could clean up and keep src/lol/algorithm/aabb_tree.h + src/lol/algorithm/portal.h src/lol/base/assert.h (could be useful) src/lol/base/avl_tree.h - src/lol/base/string.h (string utilities) src/lol/image/pixel.h (but is it useful?) src/lol/math/arraynd.h (but do we really want to keep it?) src/lol/math/geometry.h @@ -40,13 +40,10 @@ src/lol/net/http.h src/lol/public.h src/lol/sys/file.h - src/lol/sys/getopt.h src/lol/sys/init.h ## headers to remove one day - src/lol/algorithm/sort.h (there’s plenty of stuff in libc++) src/lol/base/enum.h (can’t see the point) - src/lol/base/tuple.h (use std::tuple) diff --git a/legacy/lol/algorithm/portal.h b/legacy/lol/algorithm/portal.h new file mode 100644 index 00000000..53895dd2 --- /dev/null +++ b/legacy/lol/algorithm/portal.h @@ -0,0 +1,392 @@ +// +// Lol Engine +// +// Copyright © 2010—2020 Sam Hocevar +// © 2013—2015 Benjamin “Touky” Huet +// +// Lol Engine is free software. It comes without any warranty, to +// the extent permitted by applicable law. You can redistribute it +// and/or modify it under the terms of the Do What the Fuck You Want +// to Public License, Version 2, as published by the WTFPL Task Force. +// See http://www.wtfpl.net/ for more details. +// + +#pragma once + +#include +#include // vec_t +#include // mat_t +#include +#include + +#include /* for FLT_MAX */ + +namespace lol +{ + +//------ PORTAL SYSTEM -------- +template class PortalRoom; +template class PortalDoor; +template class PortalSet; + +//-- +namespace Debug { +template +void Draw(PortalDoor& port, vec4 color) +{ + vec3 points[4]; port.GetPoints(points); + + // Draw normal + vec3 p = port.m_center + port.m_up * port.m_size.y * .5f; + Debug::DrawLine(p, p + port.m_normal, color::red); + Debug::DrawLine(p, p + port.m_up, color::green); + // Draw door + for (int l = 0; l < 4; l++) + Debug::DrawLine(points[l], points[(l + 1) % 4], color); + Debug::DrawLine(points[0], points[2], color); + Debug::DrawLine(points[1], points[3], color); +} +} + +//PortalDoor base class +template +class PortalDoor +{ + friend class PortalSet; + friend class PortalRoom; + friend void Debug::Draw(PortalDoor& port, vec4 color); + +private: + void Init() + { + m_center = vec3::zero; + m_normal = vec3::zero; + m_up = vec3::zero; + m_size = vec2::zero; + + m_view = mat4::identity; + m_proj = mat4::identity; + + m_rooms[0] = nullptr; + m_rooms[1] = nullptr; + } + +public: + //Normal portal + PortalDoor(vec3 center, vec3 normal, vec3 up, vec2 size) + { + Init(); + + m_center = center; + m_normal = normal; + m_up = up; + m_size = size; + } + //Camera portal + PortalDoor(mat4 view, mat4 proj) + { + Init(); + + m_view = view; + m_proj = proj; + } + //D.Tor + ~PortalDoor() + { + ConnectRooms(nullptr, nullptr); + } + + //Connect door to room + void ConnectRooms(class PortalRoom* front_room, class PortalRoom* back_room) + { + for (int i = 0; i < 2; i++) + if (m_rooms[i] != nullptr) + *m_rooms[i] >> this; + + m_rooms[0] = back_room; + m_rooms[1] = front_room; + + for (int i = 0; i < 2; i++) + if (m_rooms[i] != nullptr) + *m_rooms[i] << this; + } + + //-- + void DisconnectRoom(class PortalRoom* room) + { + for (int i = 0; i < 2; i++) + if (m_rooms[i] != nullptr && m_rooms[i] == room) + m_rooms[i] = nullptr; + } + + //-- + PortalRoom* GetRoom(bool front) { return m_rooms[(int)front]; } + PortalRoom* GetRoom(PortalRoom* room) { return (m_rooms[0] == room) ? m_rooms[1] : m_rooms[0]; } + + //Get Four portal point + void GetPoints(vec3 *points) const + { + vec3 right = cross(m_normal, m_up); + points[0] = m_center + right * m_size.x * .5f + m_up * m_size.y; + points[1] = m_center + right * m_size.x * .5f; + points[2] = m_center + right * m_size.x * -.5f; + points[3] = m_center + right * m_size.x * -.5f + m_up * m_size.y; + } + //Builds the portal view proj. + //Returns false if portal is out of the view or points are on each others. + bool BuildViewProj(mat4 view, mat4 proj) + { + mat4 cam_mx = proj * view; + mat4 inv_proj_mx = inverse(proj); + + // First: Check normal dot + if (lol::fabs(dot(mat3(inverse(view)) * vec3(0.f, 0.f, 1.f), m_normal)) < .00001f) + return false; + + // Second: convert to screen coordinates + vec3 port_2d[2] = { vec3(FLT_MAX), vec3(-FLT_MAX) }; + vec3 door_points[4]; + vec4 proj_p[4]; + + GetPoints(door_points); + + for (int i = 0; i < 4; i++) + { + //W to S calculations + proj_p[i] = cam_mx * vec4(door_points[i], 1.f); + proj_p[i] /= proj_p[i].w; + + //Clamp points within screen + port_2d[0] = lol::min(proj_p[i].xyz, port_2d[0]); + port_2d[1] = lol::max(proj_p[i].xyz, port_2d[1]); + port_2d[0] = vec3(lol::clamp(port_2d[0].xy, vec2(-1.f), vec2(1.f)), port_2d[0].z); + port_2d[1] = vec3(lol::clamp(port_2d[1].xy, vec2(-1.f), vec2(1.f)), port_2d[1].z); + } + + //Quit if door not within the screen + for (int i = 0; i < 3; i++) + if (port_2d[0][i] == port_2d[1][i]) + return false; + + //Third: Convert back to view + ivec2 j[4] = { ivec2(0), ivec2(0, 1), ivec2(1), ivec2(1, 0) }; + vec3 frust[2] = { vec3(FLT_MAX), vec3(-FLT_MAX) }; + for (int i = 0; i < 5; i++) + { + int k = i % 4; + //world calculations + proj_p[k] = inv_proj_mx * vec4(port_2d[j[k].x].x, port_2d[j[k].y].y, (i<4)?(port_2d[0].z):(1.f), 1.f); + proj_p[k] /= proj_p[k].w; + proj_p[k].z = lol::fabs(proj_p[k].z); + + for (int h = 0; h < 3; h++) + { + if (i < 4 || h > 1) + { + frust[0][h] = lol::min(frust[0][h], proj_p[k][h]); + frust[1][h] = lol::max(frust[1][h], proj_p[k][h]); + } + } + } + + //Fourth: Create frustum + m_proj = mat4::frustum(frust[0].x, frust[1].x, frust[0].y, frust[1].y, frust[0].z, frust[1].z); + m_view = view; + + return true; + } + + //View proj getter (doesn't check matrix validity) + mat4 GetViewProj() { return m_proj * m_view; } + + //-- + bool TestCollide(const vec3& point) + { + return TestPointVsFrustum(point, GetViewProj()); + } + + //-- + bool TestCollide(const PortalDoor& door) + { + vec3 door_points[4]; + vec3 res_points[4]; + ivec3 pos_test = ivec3::zero; + bool is_in = false; + + //Get points and test them on frustum + door.GetPoints(door_points); + for (int i = 0; i < 4; i++) + { + is_in = is_in || TestPointVsFrustum(door_points[i], GetViewProj(), &res_points[i]); + + if (is_in) + return true; + + //Add points on test stuff + pos_test += ivec3(lol::clamp(res_points[i], vec3(-1.1f), vec3(1.1f))); + } + + return false; + + //Check if at least one point is not on the same side as the others + for (int i = 0; i < 3; i++) + if (lol::fabs(pos_test[i]) == 4) + return false; + + return true; + } + +private: + mat4 m_view; + mat4 m_proj; + vec3 m_center; + vec3 m_normal; + vec3 m_up; + vec2 m_size; + PortalRoom* m_rooms[2]; //0: Back, 1: Front +}; + +//-- +template +class PortalRoom +{ + friend class PortalSet; + friend class PortalDoor; + +public: + PortalRoom(TE* element = nullptr) + { + m_element = element; + } + ~PortalRoom() + { + for (auto door : m_doors) + door->DisconnectRoom(this); + m_doors.clear(); + } + + PortalRoom& operator<<(class PortalDoor* door) + { + m_doors.push_unique(door); + return *this; + } + PortalRoom& operator>>(class PortalDoor* door) + { + m_doors.remove_swap_item(door); + return *this; + } + + int GetDoorCount() { return m_doors.count(); } + PortalDoor* GetDoor(int i) { return m_doors[i]; } + +private: + //Portals associated with this room. + array*> m_doors; + TE* m_element; +}; + +//-- +template +class PortalSet +{ +public: + ~PortalSet() + { + for (auto door : m_doors) + delete door; + for (auto room : m_rooms) + delete room; + m_doors.clear(); + m_rooms.clear(); + } + + //Visible room getter + void GetVisibleRooms(PortalDoor* see_through, PortalRoom* start_room, array*>& visible_rooms) + { + array*> ignore_doors; + GetVisibleRooms(see_through, start_room, visible_rooms, ignore_doors); + #if LOL_BUILD_DEBUG + for (auto room : visible_rooms) + { + vec4 tmp = vec4::zero; + for (auto port : room->m_doors) + { + Debug::Draw(*port, color::cyan); + tmp += vec4(port->m_center, 1.f); + } + tmp /= tmp.w; + Debug::DrawBox(tmp.xyz - vec3(1.f), tmp.xyz + vec3(1.f), color::yellow); + } + for (auto port : ignore_doors) + { + Debug::Draw(*port, color::magenta); + Debug::DrawViewProj(port->m_view, port->m_proj, color::magenta); + } + #endif //LOL_BUILD_DEBUG + } +private: + void GetVisibleRooms(PortalDoor* see_through, PortalRoom* start_room, array*>& visible_rooms, array*>& ignore_doors) + { + for (auto door : start_room->m_doors) + { + if (door == see_through || ignore_doors.Find(door) != INDEX_NONE) + continue; + + if (see_through->TestCollide(*door)) + { + PortalRoom* other_room = door->GetRoom(start_room); + if (visible_rooms.Find(other_room) != INDEX_NONE) + continue; + + ignore_doors.push_unique(door); + visible_rooms.push_unique(other_room); + door->BuildViewProj(see_through->m_view, see_through->m_proj); + GetVisibleRooms(door, other_room, visible_rooms, ignore_doors); + } + } + } +public: + + //Operator + PortalSet& operator<<(class PortalRoom* room) + { + m_rooms.push_unique(room); + for (auto door : room->m_doors) + m_doors.push_unique(door); + return *this; + } + //-- + PortalSet& operator>>(class PortalRoom* room) + { + for (auto door : room->m_doors) + *this >> door; + m_rooms.remove_item(room); + return *this; + } + //-- + PortalSet& operator<<(class PortalDoor* door) + { + m_doors.push_unique(door); + return *this; + } + //-- + PortalSet& operator>>(class PortalDoor* door) + { + m_doors.remove_item(door); + return *this; + } + + //-- + int GetDoorCount() { return m_doors.count(); } + PortalDoor* GetDoor(int i) { return m_doors[i]; } + int GetRoomCount() { return m_rooms.count(); } + PortalRoom* GetRoom(int i) { return m_rooms[i]; } + +private: + //Portals associated with this room. + array*> m_rooms; + array*> m_doors; +}; + +} /* namespace lol */ +