Thread: Setting Up SDL

I just started out learning SDL. Im kind of just trolling through it and have no real idea what I'm doing here.

Im following this tutorial: Learn Game Programming in C Episode 6 - Learning APIs - YouTube

I finally got GCC to work after messing around trying to get the right flags but now I'm getting a error message:

game.c:10:3: error: unknown type name ‘SDL_Window’
SDL_Window *window;
^
game.c:11:3: error: unknown type name ‘SDL_Renderer’
SDL_Renderer *renderer;

Here is the code...

Code:

#include <stdio.h>
#include <SDL/SDL.h>
//#include "SDl.h"


typedef struct {
  int x;
  int y;
}Bat;


int main(){
  SDL_Window *window;
  SDL_Renderer *renderer;


  SDL_Init(SDL_INIT_VIDEO);


}

Is the tutorial out of date? Or is there something wrong with the way I'm trying to compile it?
I'm using the header <SDL/SDL.h> and not "SDl.h" because I couldn't get the flags to work with "SDl.h".

I managed to get the flags right for GCC and it dosnt matter is I use <SDL.h> or <SDL/SDL.h>. I'm still getting the same errors.

Are you sure you have SDL2 installed (not just SDL1.2)? What OS are you using?

Have you tried the compile line I showed above?
It works for me.

Code:

// gcc -o sdl01 sdl01.c `sdl2-config --cflags --libs`
#include <SDL.h>
int main(){
  SDL_Window *window;
  SDL_Renderer *renderer; 
  SDL_Init(SDL_INIT_VIDEO);
  return 0;
}

Just checked and got this...
libsdl2-dev is already the newest version (2.0.4+dfsg1-2ubuntu2).

That is the correct package right? Your code is not working for me I have no idea why. The SDL example program Uni gave me works just fine. I'm using a make file to compile it... could it be the flags I'm using? I used this to compile....

gcc -std=c99 -Wall game.c -I/usr/include/SDL -lSDL2 -o game

Thanks guys its working now

Im having a new problem now... I thought I might as-well post in here than make a new thread.

So I'm still following the same youtube tutorial. My program complies but when I run it nothing happens. It should create a new window with a white square on a blue background. Code bellow:

Code:

#include <stdio.h>
#include <SDL.h>


int main(){


  SDL_Window *window;
  SDL_Renderer *renderer;


  SDL_Init(SDL_INIT_VIDEO);
  return 0;


  window = SDL_CreateWindow( "Game window",
                              SDL_WINDOWPOS_UNDEFINED,
                              SDL_WINDOWPOS_UNDEFINED,
                              640,
                              480,
                              0
                              );


  renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);




  SDL_SetRenderDrawColor(renderer, 0, 0, 255, 255);


  SDL_RenderClear(renderer);


  SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);


  SDL_Rect rect = {220, 140, 200, 200};
  SDL_RenderFillRect(renderer, &rect);


  SDL_Delay(2000);


  SDL_DestroyWindow(window);
  SDL_DestroyRenderer(renderer);


  SDL_Quit();
  return 0;




}

Haha yeah... stupid mistakes... thanks!

I'm having a problem again... The program bellow, after about 7 seconds, stops responding every-time I run it. I have no idea why...

Code:

#include <stdio.h>
#include <SDL.h>


int main(){


  SDL_Window *window;
  SDL_Renderer *renderer;


  SDL_Init(SDL_INIT_VIDEO);




  window = SDL_CreateWindow( "Keep It UP!",
                              SDL_WINDOWPOS_UNDEFINED,
                              SDL_WINDOWPOS_UNDEFINED,
                              640,
                              480,
                              0
                              );


  renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);




  int x = 0;
  int y = 10;


  while (1) {




    if (x > 439 || x < 0) {
      y = y * -1;
    }
    x = x + y;


    SDL_SetRenderDrawColor(renderer, 0, 0,255, 255);


    SDL_RenderClear(renderer);


    SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);


    SDL_Rect rect = {x, 140, 200, 200};
    SDL_RenderFillRect(renderer, &rect);


    SDL_RenderPresent(renderer);


    SDL_Delay(100);
  }




  SDL_DestroyWindow(window);
  SDL_DestroyRenderer(renderer);


  SDL_Quit();
  return 0;




}

Don't worry about the above post... I worked it out

I could use some help with this program again...

I finally have TTF working. I wrote a simple bit of code to print some test text to the window. It compiles but when I run the program I get a segmentation fault. I have never used TTF before so it might be a stupid mistake.

Here is the code:

Code:

int main(){




  int done = 0;


  Game game;
  game.score = 0;
  game.bbhold = 2;
  game.f1hold = 0;


  Bat bat;
  bat.x = 16;
  bat.y = 16;


  Ball balla;
  balla.x = 100;
  balla.y = 300;
  balla.conx = 7;
  balla.cony = 7;


  Ball ballb;
  ballb.x = 100;
  ballb.y = 10;
  ballb.conx = 2;
  ballb.cony = 3;


  Ball f1;
  f1.x = 0;
  f1.y = 100;
  f1.conx = 4;
  f1.cony = 4;


  Ball f2;
  f2.x = 800;
  f2.y = 100;
  f2.conx = 4;
  f2.cony = 4;




  //setup
  SDL_Window *window;
  SDL_Renderer *renderer;


  SDL_Init(SDL_INIT_VIDEO);


  TTF_Init();


  window = SDL_CreateWindow( "Keep It UP!",
                              SDL_WINDOWPOS_UNDEFINED,
                              SDL_WINDOWPOS_UNDEFINED,
                              800,
                              600,
                              0
                              );


  renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);


  //TTF setup
  TTF_Font *times;
  times = TTF_OpenFont("font.ttf", 20);
  SDL_Color white = {255, 255, 255};


  //end of setup




  //main game loop
  while (!done) {






    done = events(window, &bat);






    //screen setup
    SDL_SetRenderDrawColor(renderer, 0, 0,255, 255);


    SDL_RenderClear(renderer);


    // ball b drop zone
    SDL_SetRenderDrawColor(renderer, 255, 0, 50, 255);


    SDL_Rect rect = {350, 0, 100, 7};
    SDL_RenderFillRect(renderer, &rect);


    // fire ball drop zones
    SDL_SetRenderDrawColor(renderer, 255, 217, 0, 255);


    SDL_Rect rectf1 = {0, 100, 7, 80};
    SDL_RenderFillRect(renderer, &rectf1);


    SDL_Rect rectf2 = {793, 100, 7, 80};
    SDL_RenderFillRect(renderer, &rectf2);


    //set new life zones
    SDL_SetRenderDrawColor(renderer, 0, 255, 0, 255);


    SDL_Rect rectg1 = {0, 250, 7, 50};
    SDL_RenderFillRect(renderer, &rectg1);


    SDL_Rect rectg2 = {793, 250, 7, 50};
    SDL_RenderFillRect(renderer, &rectg2);






    //main function calls
    bat_ren(renderer, &bat);


    mball(renderer, &balla, &bat, &game, &ballb, &f1, &f2);


    // ball b logic
    if (game.bbhold < 2) {
      bball(renderer, &ballb, &bat, &game);
    }


    //f ball logic
    if (game.f1hold > 0) {
      ballf1(renderer, &f1, &bat, &game);
      ballf2(renderer, &f2, &bat, &game);
    }


    //ttf text
    SDL_Surface *message = TTF_RenderText_Solid(times, "test text", white);
    




    //render objects
    SDL_RenderPresent(renderer);


    SDL_Delay(10);


    SDL_FreeSurface(message);
  }




  SDL_DestroyWindow(window);
  SDL_DestroyRenderer(renderer);


  TTF_Quit();
  SDL_Quit();
  return 0;

The TTF code is all written in main and is not interacting with any of my other functions so I left them out.