Gfyuki

I wrote a simple app that generates a window, a raster, and redraws the raster once every 16ms. Right now the calculations are empty, it just draws a solid color. I don't know how, but I have created a very resource hungry app that cannot be easily closed. I generally have to close it via the task manager.

Here is my SDL "wrapper" class. Below this class is what will eventually calculate a ray caster. I initially thought my call to SDL_RenderDrawPoint for every pixel in the 600x600 window was causing the issue, but I still cannot close the window easily with that code commented out.

SDLWrapper.cpp

#include <iostream>

#include <SDL2/SDL.h>

#include <vector>

#include "include/SDLWrapper.h"



using namespace std;



#define TICK_INTERVAL 16



static int next_time;



SDLWrapper::SDLWrapper() {

}



int SDLWrapper::setupSDLRenderer(int WINDOW_WIDTH, vector<vector<RGB>> (*generateRaster)()){

    SDL_Event event;

    SDL_Renderer *renderer;

    SDL_Window *window;



SDL_Init(SDL_INIT_VIDEO);

SDL_CreateWindowAndRenderer(WINDOW_WIDTH, WINDOW_WIDTH, 0, &window, &renderer);    

next_time = SDL_GetTicks() + TICK_INTERVAL;

while (1) {

    if (SDL_PollEvent(&event) && event.type == SDL_QUIT)

        break;



    SDL_RenderClear(renderer);







    rasterPixels = (*generateRaster)();

    for (int i = 0; i < rasterPixels.size(); ++i)

    {

        for (int j = 0; j < rasterPixels.at(i).size(); ++j)

        {

            SDL_SetRenderDrawColor(renderer, 

            rasterPixels.at(i).at(j).R, 

            rasterPixels.at(i).at(j).G, 

            rasterPixels.at(i).at(j).B, 255);

            SDL_RenderDrawPoint(renderer, i, j);

        }

    }

    SDL_RenderPresent(renderer);





    SDL_Delay(time_left());

    next_time += TICK_INTERVAL;





}

SDL_DestroyRenderer(renderer);

SDL_DestroyWindow(window);

SDL_Quit();

return EXIT_SUCCESS;

}



RGB SDLWrapper::peek(int x, int y){

    return rasterPixels.at(x).at(y);

}



void SDLWrapper::poke(int x, int y, RGB color) {

   rasterPixels[x][y] = ((RGB){color.R, color.G, color.B});

}



int SDLWrapper::time_left(void)

{

Uint32 now;



now = SDL_GetTicks();

if(next_time <= now)

    return 0;

else

    return next_time - now;

}

RayCaster1.cpp

#include "include/SDLWrapper.h"

#include <iostream>

#include <vector>



#define WINDOW_WIDTH 600



#define mapWidth 24

#define mapHeight 24



vector<vector<RGB>> rasterPixels;



vector<vector<RGB>> generateRaster(){

      RGB greenPixel;

      greenPixel.R = 255;

      greenPixel.G = 255;

      greenPixel.B = 255;



      for(int i = 0; i < WINDOW_WIDTH; i++) {

          vector<RGB> column;



          for(int j = 0; j < WINDOW_WIDTH; j++){

              column.push_back(greenPixel);

          }



          rasterPixels.push_back(column);

      }



  return rasterPixels;

}



int main(int /*argc*/, char */*argv*/)

{

    double posX = 22, posY = 12;  //x and y start position

    double dirX = -1, dirY = 0; //initial direction vector

    double planeX = 0, planeY = 0.66; //the 2d raycaster version of camera plane



    SDLWrapper sdlWrapper;

    sdlWrapper.setupSDLRenderer(WINDOW_WIDTH, generateRaster);

}

Your event loop looks ill-formed, as it will only process one event per frame. Here's what it probably should look like:

SDL_Event e;

while (SDL_PollEvent(&e)) {

    if (e.type == SDL_QUIT) run = false;

}

And then change your mainloop to depend on run.