无法加载.bmp SDL2 IMG_LoadTexture

Question

so I was following this tutorial, and everything was going all smooth and dandy, until I encountered a problem, namely that I couldn't load a .bmp.

#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
#include <stdio.h>
#include <iostream>
#include <SDL2/SDL_main.h>

using namespace std;



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

bool quit = false;

SDL_Init(SDL_INIT_VIDEO);

SDL_Window* window;

window = SDL_CreateWindow("window", 100, 100, 1280, 720, SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE);

if(window == NULL){

    cout << "Disn't work, here is why: " << SDL_GetError()<< endl;
    return 0;
}


SDL_Renderer* renderer = NULL;

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

SDL_Event* mainEvent = new SDL_Event();

SDL_Texture* grass_image = NULL;
grass_image = IMG_LoadTexture(renderer, "grass.bmp");

SDL_Rect grass_rect;
grass_rect.x = 10;
grass_rect.y = 50;
grass_rect.w = 250;
grass_rect.h = 250;

while(!quit && mainEvent->type != SDL_QUIT){
    SDL_PollEvent(mainEvent);
    SDL_RenderClear(renderer);

    SDL_RenderCopy(renderer, grass_image, NULL, &grass_rect);

    SDL_RenderPresent(renderer);

}

SDL_DestroyWindow(window);
SDL_DestroyRenderer(renderer);
delete mainEvent;

return 0;
}

When I try to compile the code (in Code::Blocks) it gives me the error of

Undefined reference to "IMG_LoadTexture"

Well, I tried to change IMG_LoadTexture(renderer, "grass.bmp"); to IMG_LoadTexture(renderer, "/the/full/path/of/grass.bmp"); but this didn't work either. Same error. Have I written something wrong, or missed some part? Also, grass.bmp is in the same folder as main.cpp (the code above).

Answer 1

The error here says that you have declared a function but have not defined it - undefined reference .

Most probably it happened because you forgot to link against library SDL_image to which function IMG_LoadTexture belongs.