An Introduction to EGL - Praise for OpenGL ES 30 Programming Guide - page 65

EGLContext context = eglCreateContext ( display, config,
EGL_NO_CONTEXT,
contextAttribs);
if ( context == EGL_NO_CONTEXT )
{
return EGL_FALSE;
}

if ( !eglMakeCurrent ( display, window, window, context ) )
{
return EGL_FALSE;
}
return EGL_TRUE;
}

This code would be similar if an application made the call in Example 3-8
to open a 512 × 512 window.

Example 3-8 Creating a Window Using the esUtil Library

ESContext esContext;
const char* title = "OpenGL ES Application Window Title";

if (esCreateWindow(&esContext, title, 512, 512,
ES_WINDOW_RGB | ES_WINDOW_DEPTH))
{
// Window creation failed
}

The last parameter to esCreateWindow specifies the characteristics we
want in our window, and specifies as a bitmask of the following values:

• ES_WINDOW_RGB —Specify an RGB-based color buffer.
• ES_WINDOW_ALPHA —Allocate a destination alpha buffer.
• ES_WINDOW_DEPTH —Allocate a depth buffer.
• ES_WINDOW_STENCIL —Allocate a stencil buffer.
• ES_WINDOW_MULTISAMPLE —Allocate a multisample buffer.