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Videos/OneLoneCoder_PGE_ProcGen_Universe.cpp
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Videos/OneLoneCoder_PGE_ProcGen_Universe.cpp
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/*
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Procedural Generation: Programming The Universe
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"Here we go again! Year 4 begins now..." - javidx9
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License (OLC-3)
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~~~~~~~~~~~~~~~
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Copyright 2018-2020 OneLoneCoder.com
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions or derivations of source code must retain the above
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copyright notice, this list of conditions and the following disclaimer.
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2. Redistributions or derivative works in binary form must reproduce
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the above copyright notice. This list of conditions and the following
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disclaimer must be reproduced in the documentation and/or other
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materials provided with the distribution.
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3. Neither the name of the copyright holder nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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Relevant Video: https://youtu.be/ZZY9YE7rZJw
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Links
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~~~~~
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YouTube: https://www.youtube.com/javidx9
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https://www.youtube.com/javidx9extra
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Discord: https://discord.gg/WhwHUMV
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Twitter: https://www.twitter.com/javidx9
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Twitch: https://www.twitch.tv/javidx9
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GitHub: https://www.github.com/onelonecoder
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Patreon: https://www.patreon.com/javidx9
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Homepage: https://www.onelonecoder.com
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Author
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~~~~~~
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David Barr, aka javidx9, ©OneLoneCoder 2018, 2019, 2020
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*/
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#define OLC_PGE_APPLICATION
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#include "olcPixelGameEngine.h"
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#include <random>
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constexpr uint32_t g_starColours[8] =
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{
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0xFFFFFFFF, 0xFFD9FFFF, 0xFFA3FFFF, 0xFFFFC8C8,
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0xFFFFCB9D, 0xFF9F9FFF, 0xFF415EFF, 0xFF28199D
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};
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struct sPlanet
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{
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double distance = 0.0;
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double diameter = 0.0;
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double foliage = 0.0;
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double minerals = 0.0;
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double water = 0.0;
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double gases = 0.0;
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double temperature = 0.0;
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double population = 0.0;
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bool ring = false;
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std::vector<double> vMoons;
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};
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class cStarSystem
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{
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public:
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cStarSystem(uint32_t x, uint32_t y, bool bGenerateFullSystem = false)
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{
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// Set seed based on location of star system
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nProcGen = (x & 0xFFFF) << 16 | (y & 0xFFFF);
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// Not all locations contain a system
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starExists = (rndInt(0, 20) == 1);
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if (!starExists) return;
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// Generate Star
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starDiameter = rndDouble(10.0, 40.0);
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starColour.n = g_starColours[rndInt(0, 8)];
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// When viewing the galaxy map, we only care about the star
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// so abort early
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if (!bGenerateFullSystem) return;
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// If we are viewing the system map, we need to generate the
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// full system
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// Generate Planets
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double dDistanceFromStar = rndDouble(60.0, 200.0);
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int nPlanets = rndInt(0, 10);
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for (int i = 0; i < nPlanets; i++)
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{
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sPlanet p;
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p.distance = dDistanceFromStar;
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dDistanceFromStar += rndDouble(20.0, 200.0);
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p.diameter = rndDouble(4.0, 20.0);
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// Could make temeprature a function of distance from star
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p.temperature = rndDouble(-200.0, 300.0);
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// Composition of planet
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p.foliage = rndDouble(0.0, 1.0);
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p.minerals = rndDouble(0.0, 1.0);
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p.gases = rndDouble(0.0, 1.0);
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p.water = rndDouble(0.0, 1.0);
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// Normalise to 100%
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double dSum = 1.0 / (p.foliage + p.minerals + p.gases + p.water);
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p.foliage *= dSum;
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p.minerals *= dSum;
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p.gases *= dSum;
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p.water *= dSum;
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// Population could be a function of other habitat encouraging
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// properties, such as temperature and water
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p.population = std::max(rndInt(-5000000, 20000000), 0);
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// 10% of planets have a ring
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p.ring = rndInt(0, 10) == 1;
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// Satellites (Moons)
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int nMoons = std::max(rndInt(-5, 5), 0);
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for (int n = 0; n < nMoons; n++)
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{
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// A moon is just a diameter for now, but it could be
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// whatever you want!
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p.vMoons.push_back(rndDouble(1.0, 5.0));
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}
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// Add planet to vector
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vPlanets.push_back(p);
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}
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}
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~cStarSystem()
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{
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}
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public:
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std::vector<sPlanet> vPlanets;
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public:
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bool starExists = false;
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double starDiameter = 0.0f;
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olc::Pixel starColour = olc::WHITE;
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private:
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uint32_t nProcGen = 0;
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double rndDouble(double min, double max)
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{
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return ((double)rnd() / (double)(0x7FFFFFFF)) * (max - min) + min;
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}
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int rndInt(int min, int max)
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{
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return (rnd() % (max - min)) + min;
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}
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uint32_t rnd()
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{
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nProcGen += 0xe120fc15;
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uint64_t tmp;
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tmp = (uint64_t)nProcGen * 0x4a39b70d;
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uint32_t m1 = (tmp >> 32) ^ tmp;
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tmp = (uint64_t)m1 * 0x12fad5c9;
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uint32_t m2 = (tmp >> 32) ^ tmp;
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return m2;
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}
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};
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class olcGalaxy : public olc::PixelGameEngine
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{
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public:
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olcGalaxy()
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{
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sAppName = "olcGalaxy";
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}
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public:
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bool OnUserCreate() override
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{
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return true;
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}
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olc::vf2d vGalaxyOffset = { 0,0 };
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bool bStarSelected = false;
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uint32_t nSelectedStarSeed1 = 0;
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uint32_t nSelectedStarSeed2 = 0;
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/*uint32_t nLehmer = 0;
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uint32_t Lehmer32()
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{
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nLehmer += 0xe120fc15;
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uint64_t tmp;
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tmp = (uint64_t)nLehmer * 0x4a39b70d;
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uint32_t m1 = (tmp >> 32) ^ tmp;
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tmp = (uint64_t)m1 * 0x12fad5c9;
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uint32_t m2 = (tmp >> 32) ^ tmp;
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return m2;
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}*/
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bool OnUserUpdate(float fElapsedTime) override
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{
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if (fElapsedTime <= 0.0001f) return true;
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Clear(olc::BLACK);
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//if (GetKey(olc::SPACE).bReleased)
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//{
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// //srand(1000);
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// std::random_device rd;
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// std::mt19937 mt(1000);
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// std::uniform_int_distribution<int> dist(0, 256);
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// auto tp1 = std::chrono::system_clock::now();
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// // Ranomness Tests
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// for (int x = 0; x < ScreenWidth(); x++)
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// {
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// for (int y = 0; y < ScreenHeight(); y++)
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// {
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// bool bIsStar = false;
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// int nSeed = y << 16 | x;
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//
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// // Standard C++ rand()
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// //srand(nSeed);
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// //bIsStar = rand() % 256 < 32;
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// // std::random
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// //mt.seed(nSeed);
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// //bIsStar = dist(mt) < 32;
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// // Lehmer32
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// nLehmer = nSeed;
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// bIsStar = Lehmer32() % 256 < 32;
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// Draw(x, y, bIsStar ? olc::WHITE : olc::BLACK);
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// }
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// }
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// auto tp2 = std::chrono::system_clock::now();
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// std::chrono::duration<float> elapsedTime = tp2 - tp1;
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// DrawString(3, 3, "Time: " + std::to_string(elapsedTime.count()), olc::RED, 2);
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//}
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//return true;
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if (GetKey(olc::W).bHeld) vGalaxyOffset.y -= 50.0f * fElapsedTime;
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if (GetKey(olc::S).bHeld) vGalaxyOffset.y += 50.0f * fElapsedTime;
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if (GetKey(olc::A).bHeld) vGalaxyOffset.x -= 50.0f * fElapsedTime;
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if (GetKey(olc::D).bHeld) vGalaxyOffset.x += 50.0f * fElapsedTime;
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int nSectorsX = ScreenWidth() / 16;
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int nSectorsY = ScreenHeight() / 16;
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olc::vi2d mouse = { GetMouseX() / 16, GetMouseY() / 16 };
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olc::vi2d galaxy_mouse = mouse + vGalaxyOffset;
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olc::vi2d screen_sector = { 0,0 };
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for (screen_sector.x = 0; screen_sector.x < nSectorsX; screen_sector.x++)
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for (screen_sector.y = 0; screen_sector.y < nSectorsY; screen_sector.y++)
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{
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uint32_t seed1 = (uint32_t)vGalaxyOffset.x + (uint32_t)screen_sector.x;
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uint32_t seed2 = (uint32_t)vGalaxyOffset.y + (uint32_t)screen_sector.y;
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cStarSystem star(seed1, seed2);
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if (star.starExists)
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{
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FillCircle(screen_sector.x * 16 + 8, screen_sector.y * 16 + 8,
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(int)star.starDiameter / 8, star.starColour);
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// For convenience highlight hovered star
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if (mouse.x == screen_sector.x && mouse.y == screen_sector.y)
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{
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DrawCircle(screen_sector.x * 16 + 8, screen_sector.y * 16 + 8, 12, olc::YELLOW);
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}
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}
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}
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// Handle Mouse Click
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if (GetMouse(0).bPressed)
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{
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uint32_t seed1 = (uint32_t)vGalaxyOffset.x + (uint32_t)mouse.x;
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uint32_t seed2 = (uint32_t)vGalaxyOffset.y + (uint32_t)mouse.y;
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cStarSystem star(seed1, seed2);
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if (star.starExists)
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{
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bStarSelected = true;
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nSelectedStarSeed1 = seed1;
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nSelectedStarSeed2 = seed2;
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}
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else
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bStarSelected = false;
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}
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// Draw Details of selected star system
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if (bStarSelected)
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{
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// Generate full star system
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cStarSystem star(nSelectedStarSeed1, nSelectedStarSeed2, true);
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// Draw Window
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FillRect(8, 240, 496, 232, olc::DARK_BLUE);
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DrawRect(8, 240, 496, 232, olc::WHITE);
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// Draw Star
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olc::vi2d vBody = { 14, 356 };
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vBody.x += star.starDiameter * 1.375;
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FillCircle(vBody, (int)(star.starDiameter * 1.375), star.starColour);
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vBody.x += (star.starDiameter * 1.375) + 8;
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// Draw Planets
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for (auto& planet : star.vPlanets)
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{
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if (vBody.x + planet.diameter >= 496) break;
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vBody.x += planet.diameter;
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FillCircle(vBody, (int)(planet.diameter * 1.0), olc::RED);
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olc::vi2d vMoon = vBody;
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vMoon.y += planet.diameter + 10;
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// Draw Moons
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for (auto& moon : planet.vMoons)
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{
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vMoon.y += moon;
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FillCircle(vMoon, (int)(moon * 1.0), olc::GREY);
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vMoon.y += moon + 10;
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}
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vBody.x += planet.diameter + 8;
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}
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}
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return true;
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}
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};
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int main()
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{
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olcGalaxy demo;
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if (demo.Construct(512, 480, 2, 2, false, false))
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demo.Start();
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return 0;
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}
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