"Invalid renderer" with SDL2 & OpenGL - c++11

Question

I already used SDL2 before, and now I try to use it with openGL 2.1.
But when I try to create a renderer, I get "Invalid renderer".
For creating a renderer I already use the same line before for simple SDL2 project, but with openGL it appears to not work properly.
Does someone have an idea why ?
I tried to change the flags of CreateRenderer, and I have this error for all of them except "SDL_RENDERER_SOFTWARE", but with him I can't grab input properly, and when the mouse cursor goes out the Window I have this error : "Invalid window".
Here is my code :
#include <SDL2/SDL.h>
#include <GL/glut.h>
#include <iostream>
const int WIDTH = 500, HEIGHT = 500;
using namespace std;
SDL_Window* pWindow;
SDL_Renderer* pRenderer;
SDL_Event event;
void initOGL()
{
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(70,(double)WIDTH/HEIGHT,1,1000);
glEnable(GL_DEPTH_TEST);
glEnable(GL_TEXTURE_2D);
}
void initSDL()
{
if (SDL_Init(SDL_INIT_VIDEO) != 0)
{
cout << "Video init failed" << endl;
exit(EXIT_FAILURE);
}
cout << "Video initialized" << endl;
// Window creation
pWindow = SDL_CreateWindow("Test OGL w/ SDL2", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, WIDTH, HEIGHT, SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL);
if (!pWindow)
{
cout << "Window creation failed" << endl;
exit(EXIT_FAILURE);
}
cout << "Window created" << endl;
// Renderer creation
pRenderer = SDL_CreateRenderer(pWindow, -1, SDL_RENDERER_ACCELERATED);
if (!pRenderer)
{
cout << "Renderer creation failed" << endl;
}
cout << "Renderer created" << endl;
// OGL version
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
// OGL context
SDL_GLContext contexteOGL = SDL_GL_CreateContext(pWindow);
if (!contexteOGL)
{
cout << "Echec création du contexte" << endl;
}
cout << "Contexte créé" << endl;
}
int main(int argc, char const *argv[])
{
initSDL();
initOGL();
cout << "SDL_ERROR : " << SDL_GetError() << endl;
return 0;
}

Answer 1

I could be a "built-in supported driver" problem if you compiled SDL from source in Linux for example.
Try to use "flags = 0" in SDL_CreateRenderer(pWindow, -1, 0);
Then test the actual selected renderer (this is in C):
SDL_RendererInfo ri;
SDL_GetRendererInfo(pRenderer, &ri);
int n = SDL_GetNumRenderDrivers();
printf("Rendering drivers (%i):", n);
for(int i = 0; i < n; i++) {
SDL_RendererInfo info;
SDL_GetRenderDriverInfo(i, &info);
printf(" '%s'", info.name);
}
printf(", active = '%s'\n", ri.name);
Full source code is here