/**
* @file world.cpp
*
* Copyright (C) 2019 Belle-Isle, Andrew <drumsetmonkey@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "world.hpp"
#include "events/render.hpp"
#include "events/world.hpp"
/*****************
* WORLD CLASS *
*****************/
/* CONSTRUCTORS */
World::World(sol::object param)
{
if (param.get_type() == sol::type::table) {
sol::table tab = param;
if (tab["Seed"] == sol::type::number) {
seed = tab["Seed"];
}
if (tab["Layers"] == sol::type::number) {
layers = tab["Layers"];
}
if (tab["Register"] == sol::type::function) {
registerMat = tab["Register"];
}
if (tab["Generate"] == sol::type::function) {
generate = tab["Generate"];
}
} else {
// TODO better logging
std::cerr << "World paramaters must be stored in a table" << std::endl;
}
// If there is a register function, we should call it here
if (registerMat != sol::nil)
registerMat(this);
// If a generate function is defined, call it
if (generate != sol::nil)
generate(this);
// Create our world VBO
glGenBuffers(1, &worldVBO);
// Generate our mesh
generateMesh();
}
/* REGISTRY */
void World::registerMaterial(std::string name, sol::object data)
{
if (data.get_type() == sol::type::table) {
sol::table tab = data;
// Make sure this material has not been registered before
auto it = string_registry.find(name);
if (it == string_registry.end()) {
string_registry.emplace(name, registry.size());
registry.push_back(WorldMaterial(tab));
} else {
std::cerr << "Material: " << name
<< " was already registered" << std::endl;
}
} else {
// TODO better logging
std::cerr << "Material registration must have a table" << std::endl;
}
}
/* DATA */
void World::setData(unsigned int x,
unsigned int y,
unsigned int z,
std::string d)
{
unsigned int discovered = -1;
auto found = string_registry.find(d);
if (found != string_registry.end())
discovered = found->second;
try {
data.at(z).at(x).at(y) = discovered;
} catch (std::out_of_range &oor) {
// Make sure any assignments that are outsize specified world size are
// caught to avoid any seg faults
std::cerr << "Unable to set data at: "
<< x << "," << y << "," << z
<< " Exception: " << oor.what() << std::endl;
}
}
/* SIZE */
std::tuple<unsigned int, unsigned int, unsigned int>
World::setSize(unsigned int x, unsigned int y, unsigned int z)
{
width = x;
height = y;
layers = z;
data = std::vector<std::vector<std::vector<int>>>
(z, std::vector<std::vector<int>>
(x,std::vector<int>
(y, -1)
)
);
return {width, height, layers};
}
std::tuple<unsigned int, unsigned int, unsigned int>
World::getSize()
{
return {width, height, layers};
}
/* RENDERING */
void World::generateMesh()
{
//const unsigned int voxelLength = 6; // 2 triangles @ 3 points each
// Preallocate size of vertexes
mesh = std::basic_string<WorldMeshData>();
for (float Z = data.size() - 1; Z >= 0; Z--) {
for (float X = 0; X < data.at(Z).size(); X++) {
for (float Y = 0; Y < data.at(Z).at(X).size(); Y++) {
int d = data.at(Z).at(X).at(Y);
if (d == -1) // Don't make a mesh for air of course
continue;
Texture &t = registry.at(d).texture;
glm::vec2& to = t.offset;
glm::vec2& ts = t.size;
float tr = 1.0f;
// TODO play with this a bit so it only goes trans
// if player is behind the front layer
try {
if (Z < data.size() - 1 && Z >= 0) {
if (data.at(Z+1).at(X).at(Y) == -1)
tr = 1.0f;
}
} catch (...) {
tr = 1.0f;
}
mesh += {X , Y , Z, to.x , to.y+ts.y, tr};
mesh += {X+1, Y , Z, to.x+ts.x, to.y+ts.y, tr};
mesh += {X , Y+1, Z, to.x , to.y , tr};
mesh += {X+1, Y , Z, to.x+ts.x, to.y+ts.y, tr};
mesh += {X+1, Y+1, Z, to.x+ts.x, to.y , tr};
mesh += {X , Y+1, Z, to.x , to.y , tr};
}
}
}
glBindBuffer(GL_ARRAY_BUFFER, worldVBO);
glBufferData(GL_ARRAY_BUFFER,
mesh.size() * sizeof(WorldMeshData),
mesh.data(),
GL_STATIC_DRAW);
meshUpdated = true;
}
/* SEED */
unsigned int World::getSeed()
{
return seed;
}
unsigned int World::setSeed(unsigned int s)
{
seed = s;
return seed;
}
/* PHYSICS */
double World::getHeight(double x, double y, double z)
{
unsigned int X = static_cast<unsigned int>(x);
unsigned int Z = static_cast<unsigned int>(z);
double Y = 0.0;
try {
auto &d = data.at(Z).at(X);
for (int yi = d.size()-1; yi >= 0; yi--) {
if (d.at(yi) >= 0) {
if (!registry.at(d.at(yi)).passable) {
Y = static_cast<double>(yi);
Y += 1;
break;
}
}
}
} catch (...) { // If we get any errors, just let the character
//return y;
(void)y;
return 0.0;
}
return Y;
}
/******************
* WORLD SYSTEM *
******************/
World* WorldSystem::addWorld(sol::object t)
{
worlds.push_back(World(t));
return &(worlds.back());
}
void WorldSystem::configure([[maybe_unused]]entityx::EntityManager& entities,
[[maybe_unused]]entityx::EventManager& events)
{
}
void WorldSystem::update([[maybe_unused]]entityx::EntityManager& entities,
[[maybe_unused]]entityx::EventManager& events,
[[maybe_unused]]entityx::TimeDelta dt)
{
if (currentWorld == nullptr) {
currentWorld = &(worlds.front());
events.emit<WorldChangeEvent>(currentWorld);
}
if (currentWorld->meshUpdated) {
events.emit<WorldMeshUpdateEvent>(
currentWorld->worldVBO,
currentWorld->mesh.size(),
currentWorld->getTexture(),
currentWorld->getNormal()
);
}
}