GLboolean _glfwRefreshContextParams(void)
{
_GLFWwindow* window = _glfwLibrary.currentWindow;
if (!parseGLVersion(&window->glMajor,
&window->glMinor,
&window->glRevision))
{
return GL_FALSE;
}
if (window->glMajor > 2)
{
// OpenGL 3.0+ uses a different function for extension string retrieval
// We cache it here instead of in glfwExtensionSupported mostly to alert
// users as early as possible that their build may be broken
window->GetStringi = (PFNGLGETSTRINGIPROC) glfwGetProcAddress("glGetStringi");
if (!window->GetStringi)
{
_glfwSetError(GLFW_PLATFORM_ERROR,
"glfwCreateWindow: Entry point retrieval is broken");
return GL_FALSE;
}
}
// Read back forward-compatibility flag
{
window->glForward = GL_FALSE;
if (window->glMajor >= 3)
{
GLint flags;
glGetIntegerv(GL_CONTEXT_FLAGS, &flags);
if (flags & GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT)
window->glForward = GL_TRUE;
if (flags & 0)
window->glDebug = GL_TRUE;
}
}
// Read back OpenGL context profile
{
window->glProfile = 0;
if (window->glMajor > 3 || (window->glMajor == 3 && window->glMinor >= 2))
{
GLint mask;
glGetIntegerv(GL_CONTEXT_PROFILE_MASK, &mask);
if (mask & GL_CONTEXT_COMPATIBILITY_PROFILE_BIT)
window->glProfile = GLFW_OPENGL_COMPAT_PROFILE;
else if (mask & GL_CONTEXT_CORE_PROFILE_BIT)
window->glProfile = GLFW_OPENGL_CORE_PROFILE;
}
}
return GL_TRUE;
}
GLboolean _glfwRefreshContextAttribs(const _GLFWctxconfig* ctxconfig)
{
_GLFWwindow* window = _glfwPlatformGetCurrentContext();
if (!parseGLVersion(&window->context.api,
&window->context.major,
&window->context.minor,
&window->context.revision))
{
return GL_FALSE;
}
#if defined(_GLFW_USE_OPENGL)
if (window->context.major > 2)
{
// OpenGL 3.0+ uses a different function for extension string retrieval
// We cache it here instead of in glfwExtensionSupported mostly to alert
// users as early as possible that their build may be broken
window->GetStringi = (PFNGLGETSTRINGIPROC) glfwGetProcAddress("glGetStringi");
if (!window->GetStringi)
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"Entry point retrieval is broken");
return GL_FALSE;
}
}
if (window->context.api == GLFW_OPENGL_API)
{
// Read back context flags (OpenGL 3.0 and above)
if (window->context.major >= 3)
{
GLint flags;
glGetIntegerv(GL_CONTEXT_FLAGS, &flags);
if (flags & GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT)
window->context.forward = GL_TRUE;
if (flags & GL_CONTEXT_FLAG_DEBUG_BIT)
window->context.debug = GL_TRUE;
else if (glfwExtensionSupported("GL_ARB_debug_output") &&
ctxconfig->debug)
{
// HACK: This is a workaround for older drivers (pre KHR_debug)
// not setting the debug bit in the context flags for
// debug contexts
window->context.debug = GL_TRUE;
}
}
// Read back OpenGL context profile (OpenGL 3.2 and above)
if (window->context.major > 3 ||
(window->context.major == 3 && window->context.minor >= 2))
{
GLint mask;
glGetIntegerv(GL_CONTEXT_PROFILE_MASK, &mask);
if (mask & GL_CONTEXT_COMPATIBILITY_PROFILE_BIT)
window->context.profile = GLFW_OPENGL_COMPAT_PROFILE;
else if (mask & GL_CONTEXT_CORE_PROFILE_BIT)
window->context.profile = GLFW_OPENGL_CORE_PROFILE;
else if (glfwExtensionSupported("GL_ARB_compatibility"))
{
// HACK: This is a workaround for the compatibility profile bit
// not being set in the context flags if an OpenGL 3.2+
// context was created without having requested a specific
// version
window->context.profile = GLFW_OPENGL_COMPAT_PROFILE;
}
}
// Read back robustness strategy
if (glfwExtensionSupported("GL_ARB_robustness"))
{
// NOTE: We avoid using the context flags for detection, as they are
// only present from 3.0 while the extension applies from 1.1
GLint strategy;
glGetIntegerv(GL_RESET_NOTIFICATION_STRATEGY_ARB, &strategy);
if (strategy == GL_LOSE_CONTEXT_ON_RESET_ARB)
window->context.robustness = GLFW_LOSE_CONTEXT_ON_RESET;
else if (strategy == GL_NO_RESET_NOTIFICATION_ARB)
window->context.robustness = GLFW_NO_RESET_NOTIFICATION;
}
}
else
{
// Read back robustness strategy
if (glfwExtensionSupported("GL_EXT_robustness"))
{
// NOTE: The values of these constants match those of the OpenGL ARB
// one, so we can reuse them here
GLint strategy;
glGetIntegerv(GL_RESET_NOTIFICATION_STRATEGY_ARB, &strategy);
if (strategy == GL_LOSE_CONTEXT_ON_RESET_ARB)
window->context.robustness = GLFW_LOSE_CONTEXT_ON_RESET;
else if (strategy == GL_NO_RESET_NOTIFICATION_ARB)
window->context.robustness = GLFW_NO_RESET_NOTIFICATION;
}
}
#endif // _GLFW_USE_OPENGL
return GL_TRUE;
}
