BGFX graphics not updating - c++

Question

A am trying to compile a simple bgfx program (from this link) and failing, because the window is not updating. Closing the window is fine, so i think the problem is in bgfx. I also tried other tutorials and those didn't work either
Code:
#include <stdio.h>
#include <bgfx/bgfx.h>
#include <bgfx/platform.h>
#include <SDL2/SDL.h>
#include <SDL2/SDL_syswm.h>
SDL_Window* window = NULL;
const int WIDTH = 640;
const int HEIGHT = 480;
int main (int argc, char* args[]) {
// Initialize SDL systems
if(SDL_Init( SDL_INIT_VIDEO ) < 0) {
printf("SDL could not initialize! SDL_Error: %s\n",
SDL_GetError());
}
else {
//Create a window
window = SDL_CreateWindow("BGFX Tutorial",
SDL_WINDOWPOS_UNDEFINED,
SDL_WINDOWPOS_UNDEFINED,
WIDTH, HEIGHT,
SDL_WINDOW_SHOWN);
if(window == NULL) {
printf("Window could not be created! SDL_Error: %s\n",
SDL_GetError());
}
}
// Collect information about the window from SDL
SDL_SysWMinfo wmi;
SDL_VERSION(&wmi.version);
if (!SDL_GetWindowWMInfo(window, &wmi)) {
return 1;
}
bgfx::PlatformData pd;
// and give the pointer to the window to pd
pd.ndt = wmi.info.x11.display;
pd.nwh = (void*)(uintptr_t)wmi.info.x11.window;
// Tell bgfx about the platform and window
bgfx::setPlatformData(pd);
// Render an empty frame
bgfx::renderFrame();
// Initialize bgfx
bgfx::init();
// Reset window
bgfx::reset(WIDTH, HEIGHT, BGFX_RESET_VSYNC);
// Enable debug text.
bgfx::setDebug(BGFX_DEBUG_TEXT /*| BGFX_DEBUG_STATS*/);
// Set view rectangle for 0th view
bgfx::setViewRect(0, 0, 0, uint16_t(WIDTH), uint16_t(HEIGHT));
// Clear the view rect
bgfx::setViewClear(0,
BGFX_CLEAR_COLOR | BGFX_CLEAR_DEPTH,
0x443355FF, 1.0f, 0);
// Set empty primitive on screen
bgfx::touch(0);
// Poll for events and wait till user closes window
bool quit = false;
SDL_Event currentEvent;
while(!quit) {
while(SDL_PollEvent(&currentEvent) != 0) {
if(currentEvent.type == SDL_QUIT) {
quit = true;
}
}
}
// Free up window
SDL_DestroyWindow(window);
// Shutdown SDL
SDL_Quit();
return 0;
}
Why is this happening, and how to fix it?
P.S.: I am using kali linux