sdl-test-win.cpp

#include <exception>
#include <functional>

#ifdef __EMSCRIPTEN__

#include <emscripten.h>
#include <SDL.h>
#include <SDL_image.h>
#include <SDL_ttf.h>

#define GL_GLEXT_PROTOTYPES 1
#include <SDL_opengles2.h>

#else

#include <SDL2/SDL.h>

#define GL_GLEXT_PROTOTYPES 1
#include <SDL2/SDL_opengles2.h>

#endif

std::function<void()> loop;
void main_loop() { loop(); }

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


    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
    SDL_GL_SetSwapInterval(0);
    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
    SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
    
    auto wnd(
        SDL_CreateWindow("test", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
            640, 480, SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN));
            
    auto glc = SDL_GL_CreateContext(wnd);

    loop = [&]
    {
        SDL_Event e;
        while(SDL_PollEvent(&e))
        {
            if(e.type == SDL_QUIT) std::terminate();
        }


        // Clear the screen to blue
        glClearColor(1.0f, 0.0f, 0.0f, 1.0f);
        glClear(GL_COLOR_BUFFER_BIT);
        
        SDL_GL_SwapWindow(wnd);
    };

    while(true) main_loop();

    return 0;
}