SDL2 on Raspberry Pi can't create renderer: "OpenGL context already created"

Question

I set up SDL2 on the raspberry pi using the resources from this tutorial: https://www.youtube.com/watch?v=Yo7hO7GZ-ug I got it to compile and run. But when it reaches the point where it needs to setup the renderer, I get a NULL return value.

The accepted answer on this question suggests that the error "OpenGL context already created" is deceiving and that the OpenGL context hasn't been created at all. This would mean that my OpenGL is broken. The Raspberry Pi uses OpenGL ES and from what I understand, SDL is smart enough to use GLES instead of GL? I'm wondering if anyone else has had this kind of issue and if there's a known way to fix it.

This is my code:

#include <SDL2/SDL.h>

const char* WINDOW_TITLE = "steel";

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

    SDL_Window* window = NULL;
    SDL_Renderer* renderer = NULL;
    SDL_Init(SDL_INIT_EVERYTHING);

    // Setup window
    window = SDL_CreateWindow(
                          WINDOW_TITLE, //Title
                          SDL_WINDOWPOS_CENTERED, // x pos
                          SDL_WINDOWPOS_CENTERED, // y pos
                          0, //width
                          0, //height
                          SDL_WINDOW_FULLSCREEN_DESKTOP);


    if (window == NULL) {
        printf("Could not create window %s\n", SDL_GetError());
        return 1;
    }

    // Setup renderer
    renderer = SDL_CreateRenderer(window, 0, 0);

    if (renderer == NULL) {
        printf("Could not create renderer %s\n", SDL_GetError());
        return 1;
    }
}

Answer 1

According to SDL_CreateRenderer documentation, you should specify -1 to its second parameter to ask for the first rendering driver supporting your requested flags. The one at index 0 might not be the correct one.