Doom Fire

C++/Doom Fire Algorithm/.vscode/settings.json

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+{
+    "files.associations": {
+        "ostream": "cpp",
+        "atomic": "cpp",
+        "chrono": "cpp",
+        "cmath": "cpp",
+        "condition_variable": "cpp",
+        "cstddef": "cpp",
+        "cstdint": "cpp",
+        "cstdio": "cpp",
+        "cstdlib": "cpp",
+        "cstring": "cpp",
+        "cwchar": "cpp",
+        "exception": "cpp",
+        "fstream": "cpp",
+        "functional": "cpp",
+        "initializer_list": "cpp",
+        "ios": "cpp",
+        "iosfwd": "cpp",
+        "iostream": "cpp",
+        "istream": "cpp",
+        "limits": "cpp",
+        "list": "cpp",
+        "map": "cpp",
+        "memory": "cpp",
+        "mutex": "cpp",
+        "new": "cpp",
+        "ratio": "cpp",
+        "stdexcept": "cpp",
+        "streambuf": "cpp",
+        "string": "cpp",
+        "system_error": "cpp",
+        "xthread": "cpp",
+        "thread": "cpp",
+        "tuple": "cpp",
+        "type_traits": "cpp",
+        "typeinfo": "cpp",
+        "unordered_map": "cpp",
+        "utility": "cpp",
+        "vector": "cpp",
+        "xfacet": "cpp",
+        "xhash": "cpp",
+        "xiosbase": "cpp",
+        "xlocale": "cpp",
+        "xlocinfo": "cpp",
+        "xlocnum": "cpp",
+        "xmemory": "cpp",
+        "xmemory0": "cpp",
+        "xstddef": "cpp",
+        "xstring": "cpp",
+        "xtr1common": "cpp",
+        "xtree": "cpp",
+        "xutility": "cpp"
+    }
+}

C++/Doom Fire Algorithm/main.cpp

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+#include <iostream>
+#include <cstdlib>
+#define OLC_PGE_APPLICATION
+#include "olcPixelGameEngine.h"
+
+int WINDOW_HEIGHT = 720;
+int WINDOW_WIDTH = 1280;
+
+int fireSize = 4;
+int* firePixelsArray = new int[(WINDOW_WIDTH / fireSize) * (WINDOW_HEIGHT / fireSize)];
+int numberOfPixels = (WINDOW_WIDTH / fireSize) * (WINDOW_HEIGHT / fireSize); 
+
+int fireColoursPalette[37][3] = {{7, 7, 7}, {31, 7, 7}, {47, 15, 7}, {71, 15, 7}, {87, 23, 7}, {103, 31, 7}, {119, 31, 7}, {143, 39, 7}, {159, 47, 7}, {175, 63, 7}, {191, 71, 7}, {199, 71, 7}, {223, 79, 7}, {223, 87, 7}, {223, 87, 7}, {215, 95, 7}, {215, 95, 7}, {215, 103, 15}, {207, 111, 15}, {207, 119, 15}, {207, 127, 15}, {207, 135, 23}, {199, 135, 23}, {199, 143, 23}, {199, 151, 31}, {191, 159, 31}, {191, 159, 31}, {191, 167, 39}, {191, 167, 39}, {191, 175, 47}, {183, 175, 47}, {183, 183, 47}, {183, 183, 55}, {207, 207, 111}, {223, 223, 159}, {239, 239, 199}, {255, 255, 255}};
+
+class FireSim : public olc::PixelGameEngine {
+public:
+    FireSim() {
+        sAppName = "Doom Fire Simulator";
+    }
+
+    bool OnUserCreate() override {
+        for (int i = 0; i < numberOfPixels; i++) {
+            firePixelsArray[i] = 20;
+        }
+        return true;
+    };
+
+    bool OnUserUpdate(float fElapsedTime) override {
+        m_timeAccumilator += fElapsedTime;
+        if (m_timeAccumilator >= 0.033) {
+            m_timeAccumilator = 0.0f;
+            #pragma omp parallel for schedule(dynamic)
+            for (int i = 0; i < numberOfPixels; i++) {
+                UpdateFireIntensity(i);
+            }
+        }
+        Render();
+
+        if (GetMouse(0).bHeld) {
+            Vec2<int> m = {GetMouseX(), GetMouseY()};
+            int index =  (m.y * WINDOW_WIDTH + m.x) / fireSize;
+            if (index >= numberOfPixels) {
+                return true;
+            }
+            firePixelsArray[index] = 36;
+        }
+
+        return true;
+    }
+
+    void UpdateFireIntensity(int pixel) {
+        int pixelBelowIndex = pixel + (WINDOW_WIDTH / fireSize);
+        if (pixelBelowIndex < numberOfPixels) {
+            int decay = floor(rand() % 3);
+            int pixelBelowIntensity = firePixelsArray[pixelBelowIndex];
+            int intensity = pixelBelowIntensity - decay >= 0 ? pixelBelowIntensity - decay : 0;
+            int position  = (pixel - decay >= 0) ? pixel - decay : 0;
+            firePixelsArray[position] = intensity;
+        }
+    }
+
+    void Render() {
+        Clear(olc::BLACK);
+        for (int x = 0; x < WINDOW_WIDTH; x += fireSize) {
+            for (int y = 0; y < WINDOW_HEIGHT; y += fireSize) {
+                int pixel = x + ((WINDOW_WIDTH / fireSize) * y);
+                int pixelI = pixel / fireSize;
+                int fireIntensity = firePixelsArray[pixelI];
+                uint8_t r = fireColoursPalette[fireIntensity][0];
+                uint8_t g = fireColoursPalette[fireIntensity][1];
+                uint8_t b = fireColoursPalette[fireIntensity][2];
+                olc::Pixel col = {r, g, b, 255};
+                FillRect(x, y, fireSize, fireSize, col);
+            }
+        }
+    }
+
+    bool OnUserDestroy() override {
+        delete[] firePixelsArray;
+        return true;
+    }
+private:
+    float m_timeAccumilator = 0.0f;
+};
+
+int main(int argc, char** argv) {
+    FireSim app;
+    if (app.Construct(WINDOW_WIDTH, WINDOW_HEIGHT, 1, 1))
+        app.Start();
+    return 0;
+}