You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and dots ('.'), can be up to 35 characters long. Letters must be lowercase.
127 lines
6.5 KiB
127 lines
6.5 KiB
/*! |
|
|
|
@page compat Standards conformance |
|
|
|
This chapter describes the various API extensions used by this version of GLFW. |
|
It lists what are essentially implementation details, but which are nonetheless |
|
vital knowledge for developers wishing to deploy their applications on machines |
|
with varied specifications. |
|
|
|
Note that the information in this appendix is not a part of the API |
|
specification but merely list some of the preconditions for certain parts of the |
|
API to function on a given machine. As such, any part of it may change in |
|
future versions without this being considered a breaking API change. |
|
|
|
@section compat_wm ICCCM and EWMH conformance |
|
|
|
As GLFW uses Xlib, directly, without any intervening toolkit |
|
library, it has sole responsibility for interacting well with the many and |
|
varied window managers in use on Unix-like systems. In order for applications |
|
and window managers to work well together, a number of standards and |
|
conventions have been developed that regulate behavior outside the scope of the |
|
X11 API; most importantly the |
|
<a href="http://www.tronche.com/gui/x/icccm/">Inter-Client Communication Conventions Manual</a> |
|
(ICCCM) and |
|
<a href="http://standards.freedesktop.org/wm-spec/wm-spec-latest.html">Extended Window Manager Hints</a> |
|
(EWMH) standards. |
|
|
|
GLFW uses the ICCCM @c WM_DELETE_WINDOW protocol to intercept the user |
|
attempting to close the GLFW window. If the running window manager does not |
|
support this protocol, the close callback will never be called. |
|
|
|
GLFW uses the EWMH @c _NET_WM_PING protocol, allowing the window manager notify |
|
the user when the application has stopped responding, i.e. when it has ceased to |
|
process events. If the running window manager does not support this protocol, |
|
the user will not be notified if the application locks up. |
|
|
|
GLFW uses the EWMH @c _NET_WM_STATE protocol to tell the window manager to make |
|
the GLFW window fullscreen. If the running window manager does not support this |
|
protocol, fullscreen windows may not work properly. GLFW has a fallback code |
|
path in case this protocol is unavailable, but every window manager behaves |
|
slightly differently in this regard. |
|
|
|
@section compat_glx GLX extensions |
|
|
|
The GLX API is the default API used to create OpenGL contexts on Unix-like |
|
systems using the X Window System. |
|
|
|
GLFW uses the @c GLXFBConfig API to enumerate and select framebuffer pixel |
|
formats. This requires either GLX 1.3 or greater, or the @c GLX_SGIX_fbconfig |
|
extension. Where both are available, the SGIX extension is preferred. If |
|
neither is available, GLFW will be unable to create windows. |
|
|
|
GLFW uses the @c GLX_MESA_swap_control, @c GLX_EXT_swap_control and @c |
|
GLX_SGI_swap_control extensions to provide vertical retrace synchronization (or |
|
"vsync"), in that order of preference. Where none of these extension are |
|
available, calling @ref glfwSwapInterval will have no effect. |
|
|
|
GLFW uses the @c GLX_ARB_multisample extension to create contexts with |
|
multisampling anti-aliasing. Where this extension is unavailable, the @c |
|
GLFW_SAMPLES hint will have no effect. |
|
|
|
GLFW uses the @c GLX_ARB_create_context extension when available, even when |
|
creating OpenGL contexts of version 2.1 and below. Where this extension is |
|
unavailable, the @c GLFW_CONTEXT_VERSION_MAJOR and @c GLFW_CONTEXT_VERSION_MINOR |
|
hints will only be partially supported, the @c GLFW_OPENGL_DEBUG_CONTEXT hint |
|
will have no effect, and setting the @c GLFW_OPENGL_PROFILE or @c |
|
GLFW_OPENGL_FORWARD_COMPAT hints to a non-zero value will cause @ref |
|
glfwCreateWindow to fail. |
|
|
|
GLFW uses the @c GLX_ARB_create_context_profile extension to provide support for |
|
context profiles. Where this extension is unavailable, setting the @c |
|
GLFW_OPENGL_PROFILE hint to anything but zero, or setting @c GLFW_CLIENT_API to |
|
anything but @c GLFW_OPENGL_API will cause @ref glfwCreateWindow to fail. |
|
|
|
@section compat_wgl WGL extensions |
|
|
|
The WGL API is used to create OpenGL contexts on Microsoft Windows and other |
|
implementations of the Win32 API, such as Wine. |
|
|
|
GLFW uses either the @c WGL_EXT_extension_string or the @c |
|
WGL_ARB_extension_string extension to check for the presence of all other WGL |
|
extensions listed below. If both are available, the EXT one is preferred. If |
|
neither is available, no other extensions are used and many GLFW features |
|
related to context creation will have no effect or cause errors when used. |
|
|
|
GLFW uses the @c WGL_EXT_swap_control extension to provide vertical retrace |
|
synchronization (or "vsync"). Where this extension is unavailable, calling @ref |
|
glfwSwapInterval will have no effect. |
|
|
|
GLFW uses the @c WGL_ARB_pixel_format and @c WGL_ARB_multisample extensions to |
|
create contexts with multisampling anti-aliasing. Where these extensions are |
|
unavailable, the @c GLFW_SAMPLES hint will have no effect. |
|
|
|
GLFW uses the @c WGL_ARB_create_context extension when available, even when |
|
creating OpenGL contexts of version 2.1 and below. Where this extension is |
|
unavailable, the @c GLFW_CONTEXT_VERSION_MAJOR and @c GLFW_CONTEXT_VERSION_MINOR |
|
hints will only be partially supported, the @c GLFW_OPENGL_DEBUG_CONTEXT hint |
|
will have no effect, and setting the @c GLFW_OPENGL_PROFILE or @c |
|
GLFW_OPENGL_FORWARD_COMPAT hints to a non-zero value will cause @ref |
|
glfwCreateWindow to fail. |
|
|
|
GLFW uses the @c WGL_ARB_create_context_profile extension to provide support for |
|
context profiles. Where this extension is unavailable, setting the @c |
|
GLFW_OPENGL_PROFILE hint to anything but zero will cause @ref glfwCreateWindow |
|
to fail. |
|
|
|
@section cmopat_osx OpenGL 3.2 on Mac OS X |
|
|
|
Support for OpenGL 3.0 and above was introduced with Mac OS X 10.7, and even |
|
then only forward-compatible OpenGL 3.2 core profile contexts are supported. |
|
There is also still no mechanism for requesting debug contexts. Versions of |
|
Mac OS X earlier than 10.7 support at most OpenGL version 2.1. |
|
|
|
Because of this, on Mac OS X 10.7, the @c GLFW_CONTEXT_VERSION_MAJOR and |
|
@c GLFW_CONTEXT_VERSION_MINOR hints will fail if given a version above 3.2, the |
|
@c GLFW_OPENGL_FORWARD_COMPAT is required for creating OpenGL 3.2 contexts, the |
|
@c GLFW_OPENGL_DEBUG_CONTEXT hint is ignored and setting the @c |
|
GLFW_OPENGL_PROFILE hint to anything except @c GLFW_OPENGL_CORE_PROFILE will |
|
cause @ref glfwCreateWindow to fail. |
|
|
|
Also, on Mac OS X 10.6 and below, the @c GLFW_CONTEXT_VERSION_MAJOR and @c |
|
GLFW_CONTEXT_VERSION_MINOR hints will fail if given a version above 2.1, the @c |
|
GLFW_OPENGL_DEBUG_CONTEXT hint will have no effect, and setting the @c |
|
GLFW_OPENGL_PROFILE or @c GLFW_OPENGL_FORWARD_COMPAT hints to a non-zero value |
|
will cause @ref glfwCreateWindow to fail. |
|
|
|
*/
|
|
|