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Format: C++
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Date: Sun, 08 Jan 2023 at 19:09:49

// g++ main.cpp `pkg-config --cflags --libs sdl2`
#include <SDL.h>
#include <iostream>
#include <vector>

int main( int argc, char** argv )
{
    SDL_Init( 0 );

    std::cout << "Testing video drivers..." << '\n';
    std::vector< bool > drivers( SDL_GetNumVideoDrivers() );
    for( int i = 0; i < drivers.size(); ++i )
    {
        drivers[ i ] = ( 0 == SDL_VideoInit( SDL_GetVideoDriver( i ) ) );
        SDL_VideoQuit();
    }

    std::cout << "SDL_VIDEODRIVER available:";
    for( int i = 0; i < drivers.size(); ++i )
    {
        std::cout << " " << SDL_GetVideoDriver( i );
    }
    std::cout << '\n';

    std::cout << "SDL_VIDEODRIVER usable   :";
    for( int i = 0; i < drivers.size(); ++i )
    {
        if( !drivers[ i ] ) continue;
        std::cout << " " << SDL_GetVideoDriver( i );
    }
    std::cout << '\n';

    if( SDL_Init( SDL_INIT_EVERYTHING ) < 0 )
    {
        std::cerr << "SDL_Init(): " << SDL_GetError() << '\n';
        return EXIT_FAILURE;
    }
    std::cout << "SDL_VIDEODRIVER selected : " << SDL_GetCurrentVideoDriver() << '\n';

    SDL_Window* window = SDL_CreateWindow
        (
        "SDL2",
        SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
        640, 480,
        SDL_WINDOW_SHOWN
        );
    if( nullptr == window )
    {
        std::cerr << "SDL_CreateWindow(): " << SDL_GetError() << '\n';
        return EXIT_FAILURE;
    }

    std::cout << "SDL_RENDER_DRIVER available:";
    for( int i = 0; i < SDL_GetNumRenderDrivers(); ++i )
    {
        SDL_RendererInfo info;
        SDL_GetRenderDriverInfo( i, &info );
        std::cout << " " << info.name;
    }
    std::cout << '\n';

    SDL_Renderer* renderer = SDL_CreateRenderer( window, -1, SDL_RENDERER_ACCELERATED );
    if( nullptr == renderer )
    {
        std::cerr << "SDL_CreateRenderer(): " << SDL_GetError() << '\n';
        return EXIT_FAILURE;
    }
    SDL_RendererInfo info;
    SDL_GetRendererInfo( renderer, &info );
    std::cout << "SDL_RENDER_DRIVER selected : " << info.name << '\n';

    bool running = true;
    unsigned char i = 0;
    while( running )
    {
        SDL_Event ev;
        while( SDL_PollEvent( &ev ) )
        {
            if( ( ev.type == SDL_QUIT ) ||
                ( ev.type == SDL_KEYDOWN && ev.key.keysym.sym == SDLK_ESCAPE ) )
            {
                running = false;
            }
        }

        SDL_SetRenderDrawColor( renderer, i, i, i, SDL_ALPHA_OPAQUE );
        SDL_RenderClear( renderer );
        SDL_RenderPresent( renderer );
        i++;
    }

    SDL_DestroyRenderer( renderer );
    SDL_DestroyWindow( window );
    SDL_Quit();
    return 0;
}