How to get a SRGB default framebuffer in egl

Hello again!

I'm following a tutorial on (desktop) OpenGL 3.3 about gamma correction.

Basically to gain automatic gamma-corrected colors on the DESKTOP opengl we have to do:

1) Use the SRGBA texture format.

2) Use glEnable(GL_FRAMEBUFFER_SRGB) + at window gl context creation use a SRGB default framebuffer (e.g. GLFW_SRGB or equivalent depending on the library we're using).

Now I've read that this feature is available in OpenGLES3 too. However I got some problem with point 2 above.

-> glEnable(GL_FRAMEBUFFER_SRGB) does not seem to be present (well, this is more an OpenGLES3 question, rather then something related to the emulator).

-> To get a SRGB default framebuffer I've tried using the following code:

/* EGL Configuration */



EGLint aEGLAttributes[] = {


    
EGL_RED_SIZE, 8,


    
EGL_GREEN_SIZE, 8,


    
EGL_BLUE_SIZE, 8,


    
//EGL_DEPTH_SIZE, 24,


    
EGL_SURFACE_TYPE, EGL_WINDOW_BIT,


    
EGL_COLORSPACE,  EGL_COLORSPACE_sRGB,   





 // New, but crashes the application...


    
//EGL_GL_COLORSPACE_KHR, EGL_KHR_gl_colorspace,   





 // New, but crashes the application...


    
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT | EGL_OPENGL_ES3_BIT_KHR,


    
EGL_NONE



};








EGLint aEGLContextAttributes[] = {


    
EGL_CONTEXT_CLIENT_VERSION, 3,  // 2 = ES2, 3 = ES3


    
EGL_NONE



};








EGLConfig    aEGLConfigs[1];



EGLint   
 cEGLConfigs;




#ifdef _WIN32




MSG sMessage;



#else




Colormap colormap;



XVisualInfo *pVisual;



XEvent e;



#endif






/* EGL Init */




#ifdef _WIN32




hDisplay = EGL_DEFAULT_DISPLAY;



#else




hDisplay = XOpenDisplay(NULL);








if (!hDisplay) {


    
printf("Could not open display\n");


    
exit(-1);



}



#endif





sEGLDisplay = EGL_CHECK(eglGetDisplay(hDisplay));








EGL_CHECK(eglInitialize(sEGLDisplay, NULL, NULL));



EGL_CHECK(eglChooseConfig(sEGLDisplay, aEGLAttributes, aEGLConfigs, 1, &cEGLConfigs));    // (*)








if (cEGLConfigs == 0) {


    
printf("No EGL configurations were returned.\n");


    
exit(-1);



}




#ifdef _WIN32




hWindow = create_window(uiWidth, uiHeight);



#else




hWindow = create_window("OpenGL ES 3.0 Texture Array Example", uiWidth,


    
uiHeight, hDisplay, sEGLDisplay, aEGLConfigs[0], &colormap, &pVisual);



#endif





sEGLSurface = EGL_CHECK(eglCreateWindowSurface(sEGLDisplay, aEGLConfigs[0], (EGLNativeWindowType)hWindow, NULL));








if (sEGLSurface == EGL_NO_SURFACE) {


    
printf("Failed to create EGL surface.\n");


    
exit(-1);



}








sEGLContext = EGL_CHECK(eglCreateContext(sEGLDisplay, aEGLConfigs[0], EGL_NO_CONTEXT, aEGLContextAttributes));








if (sEGLContext == EGL_NO_CONTEXT) {


    
printf("Failed to create EGL context.\n");


    
exit(-1);



}








EGL_CHECK(eglMakeCurrent(sEGLDisplay, sEGLSurface, sEGLSurface, sEGLContext));

When I do so the program crashes with a:

eglGetError() = 12292 (0x00003004) at line (maked with (*) above):

EGL_CHECK(eglChooseConfig(sEGLDisplay, aEGLAttributes, aEGLConfigs, 1, &cEGLConfigs));    // (*)

Any hint ?