Image noise: Difference between revisions
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=={{header|C++}}==
===Version 1 (windows.h)===
[[File:noise_cpp.png]]
<syntaxhighlight lang="cpp">
Line 928 ⟶ 929:
//--------------------------------------------------------------------------------------------------
</syntaxhighlight>
===Version 2 (SDL2)===
{{libheader|SDL2}}
'''Source:''' https://gist.github.com/KatsumiKougen/58c53e77dc45e4e3a13661ff7b38c1ea
<syntaxhighlight lang="cpp">
// Standard C++ stuff
#include <iostream>
#include <string>
#include <random>
// SDL2 stuff
#include "SDL2/SDL.h"
// Other crazy stuffs
#define SCREEN_WIDTH 320
#define SCREEN_HEIGHT 240
#define COLOUR_BLACK 0, 0, 0, 0xff
#define COLOUR_WHITE 0xff, 0xff, 0xff, 0xff
// Compile: g++ -std=c++20 -Wall -Wextra -pedantic ImageNoise.cpp -o ImageNoise -lSDL2
template <class RandomGenerator>
void BlitNoise(SDL_Renderer *r, int width, int height, auto &dist, RandomGenerator &generator) {
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; ++x) {
// Use the random number generator in C++ Standard Library to determine draw colour
if (dist(generator) == 0)
// Set colour to black
SDL_SetRenderDrawColor(r, COLOUR_BLACK);
else if (dist(generator) == 1)
// Set colour to white
SDL_SetRenderDrawColor(r, COLOUR_WHITE);
// Go through every scanline, and put pixels
SDL_RenderDrawPoint(r, x, y);
}
}
}
void UpdateFPS(unsigned &frame_count, unsigned &timer, SDL_Window *window) {
static Uint64 LastTime = 0;
std::string NewWindowTitle;
Uint64 Time = SDL_GetTicks(),
Delta = Time - LastTime;
timer += Delta;
if (timer > 1000) {
unsigned ElapsedTime = timer / 1000;
NewWindowTitle = "Image noise - " + std::to_string((int)((float)frame_count/(float)ElapsedTime)) + " FPS"; // Dirty string trick
SDL_SetWindowTitle(window, const_cast<char*>(NewWindowTitle.c_str()));
timer = 0;
frame_count = 0;
NewWindowTitle.clear();
}
LastTime = Time;
}
int main() {
std::random_device Device; // Random number device
std::mt19937_64 Generator(Device()); // Random number generator
std::uniform_int_distribution ColourState(0, 1); // Colour state
unsigned Frames = 0,
Timer = 0;
SDL_Window *Window = NULL; // Define window
SDL_Renderer *Renderer = NULL; // Define renderer
// Init everything just for sure
SDL_Init(SDL_INIT_EVERYTHING);
// Set window size to 320x240, always shown
Window = SDL_CreateWindow("Image noise - ?? FPS", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
Renderer = SDL_CreateRenderer(Window, -1, SDL_RENDERER_ACCELERATED);
// Set background colour to white
SDL_SetRenderDrawColor(Renderer, COLOUR_WHITE);
SDL_RenderClear(Renderer);
// Create an event handler and a "quit" flag
SDL_Event e;
bool KillWindow = false;
// The window runs until the "quit" flag is set to true
while (!KillWindow) {
while (SDL_PollEvent(&e) != 0) {
// Go through the events in the queue
switch (e.type) {
// Event: user hits a key
case SDL_QUIT: case SDL_KEYDOWN:
// Destroy window
KillWindow = true;
break;
}
}
// Render the noise
BlitNoise(Renderer, SCREEN_WIDTH, SCREEN_HEIGHT, ColourState, Generator);
SDL_RenderPresent(Renderer);
// Increment the "Frames" variable.
// Then show the FPS count in the window title.
++Frames;
UpdateFPS(Frames, Timer, Window);
}
// Destroy renderer and window
SDL_DestroyRenderer(Renderer);
SDL_DestroyWindow(Window);
SDL_Quit();
return 0;
}
</syntaxhighlight>
{{output}}
<center>[[File:C++ image noise SDL2.gif|280px]]</center>
=={{header|Common Lisp}}==
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