Managed to get a sdl2 window in Ultra app kit on windows 10 should also work with mac os

[silageman]

spent a few hours on this and said i would post about it since it could be usefull to others here:

#include "UltraEngine.h"
#define SDL_MAIN_HANDLED
#include <SDL.h>
#include <SDL_image.h>
using namespace UltraEngine;

void clear(SDL_Renderer* renderer) {
    SDL_RenderClear(renderer);
    SDL_SetRenderDrawColor(renderer, 0, 0, 255, 255); 
}

void draw(SDL_Renderer* renderer, SDL_Rect* rectangle) {
    SDL_Surface* surface = SDL_LoadBMP("test.bmp");
    SDL_Texture* texture = SDL_CreateTextureFromSurface(renderer, surface);
    SDL_FreeSurface(surface);
    SDL_RenderCopy(renderer, texture, NULL, rectangle);
    SDL_RenderPresent(renderer);
}

int main(int argc, const char* argv[])
{

    //Get the available displays
    auto displays = GetDisplays();
    //Create a window
    auto window = CreateWindow("SDL2 Example with Ultra App Kit", 0, 0, 1920, 1080, displays[0], WINDOW_TITLEBAR | WINDOW_RESIZABLE);
    auto ui = CreateInterface(window);
    iVec2 sz = ui->root->ClientSize();
    auto viewport = CreateWindow("", 200, 8, sz.x - 200 - 8, sz.y - 16, window, WINDOW_CHILD);
    auto btnW = CreateButton("W", 0, 0, 200, 200, ui->root);
    auto btnS = CreateButton("S", 0, 200, 200, 200, ui->root);
    auto btnA = CreateButton("A", 0, 400, 200, 200, ui->root);
    auto btnD = CreateButton("D", 0,600, 200, 200, ui->root);
    SDL_Renderer* renderer;
    SDL_SetMainReady();
    SDL_Init(SDL_INIT_EVERYTHING);
    auto getwindow = SDL_CreateWindowFrom(viewport->GetHandle());
    renderer = SDL_CreateRenderer(getwindow, -1, SDL_RENDERER_ACCELERATED);

   SDL_Rect rectangle = {
   rectangle.x = 40,
   rectangle.y = 40,
   rectangle.w = 40,
   rectangle.h = 40
    };


   bool running = true;
    while (running)
    {

        clear(renderer);
        
        while (PeekEvent())
        {
            const Event ev = WaitEvent();
            switch (ev.id)
            {
            case EVENT_WINDOWCLOSE:
                if (ev.source == window)
                {
                    return 0;
                }
                break;
            case EVENT_WIDGETACTION:
                if (ev.source == btnW)
                {

                    rectangle.y -=10;

                }
                else if (ev.source == btnS)
                {

                    rectangle.y += 10;

                }
                else if (ev.source == btnA)
                {

                    rectangle.x -= 10;

                }
                else if (ev.source == btnD)
                {

                    rectangle.x += 10;

                }
                break;
            }

        }
        draw(renderer, &rectangle);
    }
    SDL_DestroyWindow(getwindow);
    SDL_Quit();
    return 0;
}