Basically, in my program I have sometimes to create and destroy a window. I always use the same window pointer creating and destroying the contents (texture and render).

I notice a memory leak in this process (checking memory usage by the application process) so I wrote a simple program to verify this.

At the end the process occupied 243.4 MB of RAM, at the beginning 7.3 MB.

Here the code in order to reproduce the problem:

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#include <iostream>
#include "SDL.h"


int main(int argc, char *argv[])
{
	SDL_Init(SDL_INIT_VIDEO);

	SDL_Window* mainWindow;
	SDL_Renderer* mainRenderer;
	SDL_Texture* mainTexture;

	for (int i = 0; i < 200; i++)
	{
		mainWindow = SDL_CreateWindow("Memory Leak Test v1.0", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 320, 240, SDL_WINDOW_SHOWN);
		mainRenderer = SDL_CreateRenderer(mainWindow, -1, SDL_RENDERER_ACCELERATED);
		mainTexture = SDL_CreateTexture(mainRenderer, SDL_PIXELFORMAT_ABGR8888, SDL_TEXTUREACCESS_STREAMING, 320, 240);

		if (i == 0)
		{
			std::cout << "SDL Memory Leak Tester, please check the amount of memory\noccupied by the process, then press Enter\n";
			getchar();
		}

		SDL_Delay(50);

		if (i == 199)
		{
			std::cout << "SDL Memory Leak Tester, please check the amount of memory\noccupied by the process, then press Enter\n";
			getchar();
		}

		SDL_DestroyTexture(mainTexture);
		SDL_DestroyRenderer(mainRenderer);
		SDL_DestroyWindow(mainWindow);
	}

	std::cout << "Test finished, press Enter to close\n";
	getchar();

	return 0;
}