I’ve installed SDL2 on my arch linux system. Here’s my CMakeLists.txt setup:
cmake_minimum_required(VERSION 3.12)
project(ChessEngine)
set(CMAKE_CXX_STANDARD 11)
# Add your source files
file(GLOB SOURCE_FILES "src/*.cpp" "src/*.h")
# Add the executable
add_executable(ChessEngine ${SOURCE_FILES})
# SDL2
find_package(SDL2 REQUIRED)
include_directories(${SDL2_INCLUDE_DIRS})
target_link_libraries(ChessEngine ${SDL2_LIBRARIES})
And here’s my main.cpp file:
/**
* @file main.cpp
* @author Hashem A. Damrah
* @brief Main file for the chess engine.
* @copyright
*/
#include "./headers/renderWindow.h"
#include <iostream>
#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
int main(int argc, char* args[]) {
// Initialize SDL
if (SDL_Init(SDL_INIT_EVERYTHING) > 0) {
std::cerr
<< "SDL could not initialize! SDL_Error: "
<< SDL_GetError()
<< std::endl;
}
// Initialize SDL_image
if (!(IMG_Init(IMG_INIT_PNG))) {
std::cerr
<< "SDL_image could not initialize! SDL_image Error: "
<< SDL_GetError()
<< std::endl;
}
/**
* @brief The window that the game is rendered in.
*/
RenderWindow window("Chess", 700, 700);
/**
* @brief The event that is used to handle user input.
*/
SDL_Event event;
/**
* @brief Variable that controls the main loop.
*/
bool isRunning = true;
// Main game loop
while (isRunning) {
// Check for user input
while (SDL_PollEvent(&event)) {
// Check if the user wants to quit
if (event.type == SDL_QUIT) {
// If so, exit the main loop
isRunning = false;
}
}
}
window.cleanUp();
SDL_Quit();
return 0;
}
And here’s the renderWindow.cpp:
/**
* @file renderWindow.cpp
* @author Hashem A. Damrah
* @brief Implementation file for the RenderWindow class.
* @copyright
*/
#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
#include <iostream>
#include "./headers/renderWindow.h"
RenderWindow::RenderWindow(const char *title, int p, int h)
: window(NULL), renderer(NULL) {
window = SDL_CreateWindow(title, SDL_WINDOWPOS_UNDEFINED,
SDL_WINDOWPOS_UNDEFINED, p, h, SDL_WINDOW_SHOWN);
if (window == NULL) {
std::cerr << "Window failed to init. Error: " << SDL_GetError()
<< std::endl;
}
renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
}
SDL_Texture *RenderWindow::loadTexture(const char *filePath) {
SDL_Texture *texture = NULL;
texture = IMG_LoadTexture(renderer, filePath);
if (texture == NULL) {
std::cerr << "Failed to load texture. Error: " << SDL_GetError()
<< std::endl;
}
return texture;
}
void RenderWindow::cleanUp() {
SDL_DestroyWindow(window);
}
Lastly, here’s the renderWindow.h:
/**
* @file renderWindow.h
* @author Hashem A. Damrah
* @brief Header file for the RenderWindow class.
* @copyright
*/
#pragma once
#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
/**
* @class RenderWindow
* @brief A class that represents the window that the game is rendered in.
*
*/
class RenderWindow {
public:
/**
* @brief Construct a new Render Window object.
*
* @param title The title of the window.
* @param w Width of the window.
* @param h Height of the window.
*/
RenderWindow(const char* title, int w, int h);
/**
* @brief Render the game.
*
* @param filePath The path to the image that is to be rendered.
* @return SDL_Texture* The texture that is to be rendered.
*/
SDL_Texture* loadTexture(const char* filePath);
/**
* @brief Destroy the Render Window object.
*/
void cleanUp();
private:
/**
* @brief The window that the game is rendered in.
*/
SDL_Window* window;
/**
* @brief The renderer that renders the game.
*/
SDL_Renderer* renderer;
};
But when I run mkdir build; cd build; cmake ..; make, I get the following errors:
/usr/bin/ld: CMakeFiles/ChessEngine.dir/src/main.cpp.o: in function `main':
main.cpp:(.text+0x7f): undefined reference to `IMG_Init'
/usr/bin/ld: CMakeFiles/ChessEngine.dir/src/renderWindow.cpp.o: in function `RenderWindow::loadTexture(char const*)':
renderWindow.cpp:(.text+0xfa): undefined reference to `IMG_LoadTexture'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/ChessEngine.dir/build.make:131: ChessEngine] Error 1
make[1]: *** [CMakeFiles/Makefile2:83: CMakeFiles/ChessEngine.dir/all] Error 2
make: *** [Makefile:91: all] Error 2
Here’s the link to the repo if you need more info.
