c4droid SDL opengl exemple

#include "SDL.h"
#include "SDL.h"

#include <EGL/egl.h>

#include <GLES/gl.h>
#include <SDL2/SDL.h>
    SDL_Window *win = NULL;
    SDL_Renderer *renderer = NULL;
    SDL_Texture *bitmapTex = NULL;
        SDL_Surface *surface;
        SDL_Rect rect, darea;
    SDL_Surface *bitmapSurface = NULL;
void
DrawChessBoard(SDL_Renderer * renderer)
{
    int row = 0,column = 0,x = 0;
    SDL_Rect rect, darea;

    /* Get the Size of drawing surface */
    SDL_RenderGetViewport(renderer, &darea);

    for ( ; row < 8; row++) {
        column = row%2;
        x = column;
        for ( ; column < 4+(row%2); column++) {
            SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0xFF);

            rect.w = darea.w/8;
            rect.h = darea.h/8;
            rect.x = x * rect.w;
            rect.y = row * rect.h;
            x = x + 2;
            SDL_RenderFillRect(renderer, &rect);
        }
    }
}
int main(int argc, char *argv[]) {

    int posX = 100, posY = 100, width = 320, height = 240;
           SDL_RenderFillRect(renderer, &rect);
    SDL_Init(SDL_INIT_VIDEO);

    win = SDL_CreateWindow("Hello World", posX, posY, width, height, SDL_WINDOW_OPENGL);
    surface = SDL_GetWindowSurface(win);
    renderer = SDL_CreateSoftwareRenderer(surface);
   // renderer = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED);
    SDL_RenderGetViewport(renderer, &darea);
             SDL_SetRenderDrawColor(renderer, 1, 0, 0, 0xFF);
    bitmapSurface = SDL_LoadBMP("hello.bmp");
    bitmapTex = SDL_CreateTextureFromSurface(renderer, bitmapSurface);
    SDL_FreeSurface(bitmapSurface);

    while (1) {
        SDL_Event e;
        if (SDL_PollEvent(&e)) {
            if (e.type == SDL_QUIT) {
                break;
            }
        }
            DrawChessBoard(renderer);

    /* Got everything on rendering surface,
       now Update the drawing image on window screen */
    SDL_UpdateWindowSurface(win);
           SDL_RenderFillRect(renderer, &rect);        
        SDL_RenderClear(renderer);
        SDL_RenderCopy(renderer, bitmapTex, NULL, NULL);
        SDL_RenderPresent(renderer);
                glClearColor(1.0f, 0.0f, 0.0f, 1.0f);

        glClear(GL_COLOR_BUFFER_BIT);


        // Draw a triangle from the 3 vertices



    SDL_GL_SwapWindow(win);
    }

    SDL_DestroyTexture(bitmapTex);
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(win);

    SDL_Quit();

    return 0;
}