OpenGL failing to init properly on iOS

[grimaldini]

Could not load necessary function to initialize OpenGL context

Seems like OpenGL is not initializing properly on iOS, crashing on line 298 of EaglContext.mm
glGenFramebuffersOESFunc(1, &m_framebuffer); with null glGenFramebuffersOESFunc and null m_framebuffer.

Your environment

• os: iOS (simulator: iOS 13.6 (17G64), Model: iPhone SE (2nd generation))
• version: master
• Xcode Version 11.6 (11E708)
• No special compiler flags used

Steps to reproduce

Just running the code below, will crash on line 1 of the main function
Output:

Could not load necessary function to initialize OpenGL context
2020-07-23 03:57:18.405916-0700 MyApp[20222:452887] [Assert] -[UIApplication setStatusBarOrientation:] and -[UIApplication setStatusBarOrientation:animated:] API have been deprecated on iOS 8.0 and are no-ops on iOS 13.0

#ifdef __APPLE__
    #include "TargetConditionals.h"
    #if TARGET_OS_IPHONE
        #include <SFML/Main.hpp>
    #endif
#endif

#include <SFML/Graphics.hpp>

int main() {
	sf::RenderWindow window(sf::VideoMode(), "Hello world!");
	while(window.isOpen()) {
		sf::Event event;
		while (window.pollEvent(event))
		{
			if (event.key.code == sf::Keyboard::Escape) {
				window.close();
			}
			
			if (event.type == sf::Event::Closed)
				window.close();
		}
		
		window.clear();
		window.display();
	}
	
	return EXIT_SUCCESS;
}

Expected behavior

Should show an empty black screen

Actual behavior

Crash

[eXpl0it3r]

Not sure if the crash happened because of the OpenGL issue or the deprecated function.
Can you try and target something earlier than iOS 13 to see if it's because of the no-oped function in iOS 13?

[grimaldini]

I doubt it, I think it might be a regression in master. I downloaded v2.5.1 and it worked correctly there, well semi-correctly, I needed to add window->setActive(); after initializing the window for some reason, but that seems to be a different issue.

[JonnyPtn]

Have you got a device to test on? I know the simulator was updated not so long ago (with xcode 11 I think) to make Metal available, which may have had some sort of impact on other stuff. If not (or if the same thing happens on the device) then I should be able to take a look

[grimaldini]

Unfortunately I don't have a test device...

[MoVoDesign]

Same issue today (2020-12-30) with

OSX 10.14.6
XCode 11.2.1
Simulator - iOS 13.2 SDK
SFML 2.5.1 (built arm64 + x86_64, made fat libs, code-signed)

[JonnyPtn]

So this is failing because it's not able to load libGLESv1_CM.dylib anymore. Why that is, I don't know. I can't really find any explanation for it online.

[eXpl0it3r]

@MoVoDesign / @grimaldini can you give #1804 a try? 🙂