‘IMG_Load’ was not declared in this scope SDL 2 - c++

Question

I'm trying to make an application with SDL and I would like to add an icon on my window but when I compile I get this error :
error: ‘IMG_Load’ was not declared in this scope
SDL_Surface * icon_surface = IMG_Load(icon);
^
I'am using cmake and make for the compilation, here is the CMakeLists.txt
cmake_minimum_required (VERSION 2.6)
set(PROJECT_NAME "Engine")
project (${PROJECT_NAME})
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c++0x")
if( CMAKE_SIZEOF_VOID_P EQUAL 8 )
MESSAGE( "64 bits compiler detected" )
SET( EX_PLATFORM 64 )
SET( EX_PLATFORM_NAME "x64" )
SET( EXECUTABLE_NAME ${PROJECT_NAME}-x64 )
else( CMAKE_SIZEOF_VOID_P EQUAL 8 )
MESSAGE( "32 bits compiler detected" )
SET( EX_PLATFORM 32 )
SET( EX_PLATFORM_NAME "x86" )
SET( EXECUTABLE_NAME ${PROJECT_NAME}-x86 )
endif( CMAKE_SIZEOF_VOID_P EQUAL 8 )
# The executable file will be generate in the bin/ directory
set(EXECUTABLE_OUTPUT_PATH bin/${CMAKE_BUILD_TYPE})
# All .h files are in the include/ directory
include_directories(
../include/
)
# All .cpp files are in the src/ directory
file(
GLOB_RECURSE
SOURCE_FILES
../src/*
)
add_executable(
${EXECUTABLE_NAME}
${HEADER_FILES}
${SOURCE_FILES}
)
target_link_libraries(
${EXECUTABLE_NAME}
GL
GLEW
SDL2
)
and here the main.cpp
#include <stdio.h>
#include <stdlib.h>
#include <GL/glew.h>
#include <SDL2/SDL.h>
#include <glm/glm.hpp>
using namespace glm;
using namespace std;
SDL_Window * CreateWindow(
const char * title,
int x,
int y,
int w,
int h,
Uint32 flags,
const char * icon
);
SDL_Renderer * CreateRenderer(
SDL_Window * window,
Uint32 flags,
int r,
int g,
int b
);
void Init(Uint32 flags);
int main(void)
{
Init(SDL_INIT_EVERYTHING);
SDL_Window * window = CreateWindow("Prism", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 800, 600, /*SDL_WINDOW_FULLSCREEN_DESKTOP*/ SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL, "../../assets/icon.png");
SDL_Renderer * renderer = CreateRenderer(window, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC, 0, 0, 0);
bool end = false;
SDL_Event events;
while(!end) {
SDL_WaitEvent(&events);
if(events.window.event == SDL_WINDOWEVENT_CLOSE)
end = true;
SDL_RenderClear(renderer); // On nettoie l'écran
SDL_RenderPresent(renderer); // Et on effectue le rendu
}
SDL_DestroyWindow(window);
SDL_Quit();
return(EXIT_SUCCESS);
}
void Init(Uint32 flags){
if(SDL_Init(flags) < 0){
printf("Erreur lors de l'initialisation de la SDL : %s\n", SDL_GetError());
exit(EXIT_FAILURE);
}
}
SDL_Window * CreateWindow(const char * title, int x, int y, int w, int h, Uint32 flags, const char * icon)
{
SDL_Window * window = SDL_CreateWindow(title, x, y, w, h, flags);
if(window == NULL){
printf("Erreur lors de la création de la fenêtre : %s\n", SDL_GetError());
exit(EXIT_FAILURE);
}
SDL_Surface * icon_surface = IMG_Load(icon);
if(icon_surface == NULL){
printf("Erreur lors de la récupération de l'icone : %s\n", SDL_GetError());
exit(EXIT_FAILURE);
}
SDL_SetWindowIcon(window, icon_surface);
SDL_FreeSurface(icon_surface);
SDL_ShowCursor(SDL_DISABLE);
return window;
}
SDL_Renderer * CreateRenderer(SDL_Window * window, Uint32 flags, int r, int g, int b)
{
SDL_Renderer * renderer = SDL_CreateRenderer(window, -1, flags);
if(renderer == NULL){
printf("Erreur lors de la création du renderer : %s\n", SDL_GetError());
exit(EXIT_FAILURE);
}
if(SDL_SetRenderDrawColor(renderer, r, g, b, 255) < 0){
printf("Erreur lors de la modification de la couleur de fond du renderer : %s\n", SDL_GetError());
exit(EXIT_FAILURE);
}
return renderer;
}
I tried to add SDL_image.h in the include directory but I get an error because the compiler isn't able to find the SDL.h specified in the SDL_image.h...
Thank you for your helps !

Answer 1

Hmm... not sure, but maybe try this?
#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
Include both headers, in that order.

Answer 2

Aside from include <SDL2/SDL_image.h> as suggested by Justin Time, you would also have to supply the library (SDL2_image) to link against your executable in your cmake file, like so;
target_link_libraries(
${EXECUTABLE_NAME}
GL
GLEW
SDL2
SDL2_image
)
I just tested your code and it runs fine with above modification. Make sure your "../../assets/icon.png" is accessible to your executable. Hope that helps.

Answer 3

Ok
So I'm an idiot because I didn't install libsdl2-image-2.0-0... I looked at what you sent me Gestrong and I changed my CMakeList.txt to the following :
cmake_minimum_required (VERSION 2.6)
SET(PROJECT_NAME "Engine")
PROJECT(${PROJECT_NAME})
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c++0x")
INCLUDE(FindPkgConfig)
INCLUDE(FindOpenGL REQUIRED)
INCLUDE(FindGLEW REQUIRED)
INCLUDE(FindSDL REQUIRED)
PKG_SEARCH_MODULE(SDL2 REQUIRED sdl2)
PKG_SEARCH_MODULE(SDL2IMAGE REQUIRED SDL2_image)
INCLUDE_DIRECTORIES(${OPENGL_INCLUDE_DIR})
INCLUDE_DIRECTORIES(${GLEW_INCLUDE_DIR})
SET(EXECUTABLE_OUTPUT_PATH bin/)
INCLUDE_DIRECTORIES(../include/)
INCLUDE_DIRECTORIES(${SDL2_INCLUDE_DIRS})
INCLUDE_DIRECTORIES(${SDL2IMAGE_INCLUDE_DIRS})
FILE(
GLOB_RECURSE
SOURCE_FILES
../src/*
)
ADD_EXECUTABLE(
${PROJECT_NAME}
${SOURCE_FILES}
)
TARGET_LINK_LIBRARIES(
${PROJECT_NAME}
${SDL2_LIBRARIES}
${SDL2IMAGE_LIBRARIES}
${OPENGL_LIBRARIES}
${GLEW_LIBRARIES}
)
I added #include <SDL2/SDL_image.h> in my code and now it WORKS :) thank you !