caio/glfw
1
0
Fork 0
mirror of https://github.com/glfw/glfw.git synced 2026-08-29 03:04:14 +02:00
Code Issues Packages Projects Releases Wiki Activity

Documentation work.

Browse Source
This commit is contained in:
Camilla Berglund
2014-09-18 15:03:29 +02:00
parent c769061a8a
commit 4591ad2d64
21 changed files with 3186 additions and 882 deletions
Download Patch File Download Diff File Expand all files Collapse all files

625
docs/window.dox
View File

@@ -1,6 +1,6 @@
/*!
@page window Window handling guide
@page window Window guide
@tableofcontents
@@ -8,8 +8,16 @@ The primary purpose of GLFW is to provide a simple interface to window
management and OpenGL and OpenGL ES context creation. GLFW supports multiple
windows, which can be either a normal desktop window or a full screen window.
This guide introduces the window related functions of GLFW. There are also
guides for the other areas of GLFW.
@section window_object Window handles
- @ref intro
- @ref context
- @ref monitor
- @ref input
@section window_object Window objects
The @ref GLFWwindow object encapsulates both a window and a context. They are
created with @ref glfwCreateWindow and destroyed with @ref glfwDestroyWindow (or
@@ -17,30 +25,34 @@ created with @ref glfwCreateWindow and destroyed with @ref glfwDestroyWindow (or
linked, the object pointer is used as both a context and window handle.
@section window_creation Window creation
@subsection window_creation Window creation
The window and its context are created with @ref glfwCreateWindow, which
returns a handle to the created window object. For example, this creates a 640
by 480 windowed mode window:
A window and its OpenGL or OpenGL ES context are created with @ref
glfwCreateWindow, which returns a handle to the created window object. For
example, this creates a 640 by 480 windowed mode window:
@code
GLFWwindow* window = glfwCreateWindow(640, 480, "My Title", NULL, NULL);
@endcode
If window creation fails, `NULL` will be returned, so it is necessary to check
the return value.
@code
if (!window)
{
// Handle window creation failure
}
@endcode
If window creation fails, `NULL` will be returned, so you need to check the
return value. If creation failed, an error will have been reported to the error
callback.
This handle is then passed to all window related functions, and is provided to
you along with input events, so you know which window received the input.
The window handle is passed to all window related functions and is provided to
along with all input events, so event handlers can tell which window received
the event.
To create a full screen window, you need to specify which monitor the window
should use. In most cases, the user's primary monitor is a good choice. For
more information about monitors, see the @ref monitor.
should use. In most cases, the user's primary monitor is a good choice. You
can get this with @ref glfwGetPrimaryMonitor. For more information about
monitors, see the @ref monitor.
@code
GLFWwindow* window = glfwCreateWindow(640, 480, "My Title", glfwGetPrimaryMonitor(), NULL);
@@ -54,28 +66,25 @@ For more control over how the window and its context are created, see @ref
window_hints below.
@section window_destruction Window destruction
@subsection window_destruction Window destruction
When you are done with the window, destroy it with the @ref glfwDestroyWindow
function.
When a window is no longer needed, destroy it with @ref glfwDestroyWindow.
@code
glfwDestroyWindow(window);
@endcode
Once this function is called, no more events will be delivered for that window
and its handle becomes invalid.
Window destruction always succeeds. Before the actual destruction, all
callbacks are removed so no further events will be delivered for the window.
When a full screen window is destroyed, the original video mode of its monitor
is restored, but the gamma ramp is left untouched.
All windows remaining at the time @ref glfwTerminate is called are destroyed as
well.
@section window_userptr Window user pointer
Each window has a user pointer that can be set with @ref
glfwSetWindowUserPointer and fetched with @ref glfwGetWindowUserPointer. This
can be used for any purpose you need and will not be modified by GLFW throughout
the life-time of the window.
@section window_hints Window creation hints
@subsection window_hints Window creation hints
There are a number of hints that can be set before the creation of a window and
context. Some affect the window itself, others affect the framebuffer or
@@ -87,7 +96,7 @@ Note that hints need to be set *before* the creation of the window and context
you wish to have the specified attributes.
@subsection window_hints_hard Hard and soft constraints
@subsubsection window_hints_hard Hard and soft constraints
Some window hints are hard constraints. These must match the available
capabilities *exactly* for window and context creation to succeed. Hints
@@ -107,126 +116,127 @@ context, but are ignored when requesting an OpenGL ES context:
- `GLFW_OPENGL_PROFILE`
@subsection window_hints_wnd Window related hints
@subsubsection window_hints_wnd Window related hints
The `GLFW_RESIZABLE` hint specifies whether the (windowed mode) window will be
resizable *by the user*. The window will still be resizable using the @ref
`GLFW_RESIZABLE` specifies whether the (windowed mode) window will be resizable
*by the user*. The window will still be resizable using the @ref
glfwSetWindowSize function. This hint is ignored for full screen windows.
The `GLFW_VISIBLE` hint specifies whether the (windowed mode) window will be
initially visible. This hint is ignored for full screen windows.
`GLFW_VISIBLE` specifies whether the (windowed mode) window will be initially
visible. This hint is ignored for full screen windows.
The `GLFW_DECORATED` hint specifies whether the (windowed mode) window will have
window decorations such as a border, a close widget, etc. This hint is ignored
for full screen windows. Note that even though a window may lack a close
widget, it is usually still possible for the user to generate close events.
`GLFW_DECORATED` specifies whether the (windowed mode) window will have window
decorations such as a border, a close widget, etc. This hint is ignored for
full screen windows. Note that even though a window may lack a close widget, it
is usually still possible for the user to generate close events.
The `GLFW_FOCUSED` hint specifies whether the (windowed mode) window will be
given input focus when created. This hint is ignored for full screen and
initially hidden windows.
`GLFW_FOCUSED` specifies whether the (windowed mode) window will be given input
focus when created. This hint is ignored for full screen and initially hidden
windows.
The `GLFW_AUTO_ICONIFY` hint specifies whether the (full screen) window
will automatically iconify and restore the previous video mode on focus loss.
This hint is ignored for windowed mode windows.
`GLFW_AUTO_ICONIFY` specifies whether the (full screen) window will
automatically iconify and restore the previous video mode on focus loss. This
hint is ignored for windowed mode windows.
The `GLFW_FLOATING` hint specifies whether the window will be floating above
other regular windows, also called topmost or always-on-top. This is intended
`GLFW_FLOATING` specifies whether the window will be floating above other
regular windows, also called topmost or always-on-top. This is intended
primarily for debugging purposes and cannot be used to implement proper full
screen windows. This hint is ignored for full screen windows.
@subsection window_hints_fb Framebuffer related hints
@subsubsection window_hints_fb Framebuffer related hints
The `GLFW_RED_BITS`, `GLFW_GREEN_BITS`, `GLFW_BLUE_BITS`, `GLFW_ALPHA_BITS`,
`GLFW_DEPTH_BITS` and `GLFW_STENCIL_BITS` hints specify the desired bit
depths of the various components of the default framebuffer. `GLFW_DONT_CARE`
means the application has no preference.
The `GLFW_ACCUM_RED_BITS`, `GLFW_ACCUM_GREEN_BITS`, `GLFW_ACCUM_BLUE_BITS`
and `GLFW_ACCUM_ALPHA_BITS` hints specify the desired bit depths of the
various components of the accumulation buffer. `GLFW_DONT_CARE` means the
`GLFW_RED_BITS`, `GLFW_GREEN_BITS`, `GLFW_BLUE_BITS`, `GLFW_ALPHA_BITS`,
`GLFW_DEPTH_BITS` and `GLFW_STENCIL_BITS` specify the desired bit depths of the
various components of the default framebuffer. `GLFW_DONT_CARE` means the
application has no preference.
`GLFW_ACCUM_RED_BITS`, `GLFW_ACCUM_GREEN_BITS`, `GLFW_ACCUM_BLUE_BITS` and
`GLFW_ACCUM_ALPHA_BITS` specify the desired bit depths of the various components
of the accumulation buffer. `GLFW_DONT_CARE` means the application has no
preference.
@note Accumulation buffers are a legacy OpenGL feature and should not be used in
new code.
The `GLFW_AUX_BUFFERS` hint specifies the desired number of auxiliary
buffers. `GLFW_DONT_CARE` means the application has no preference.
`GLFW_AUX_BUFFERS` specifies the desired number of auxiliary buffers.
`GLFW_DONT_CARE` means the application has no preference.
@note Auxiliary buffers are a legacy OpenGL feature and should not be used in
new code.
The `GLFW_STEREO` hint specifies whether to use stereoscopic rendering. This is
a hard constraint.
The `GLFW_SAMPLES` hint specifies the desired number of samples to use for
multisampling. Zero disables multisampling. `GLFW_DONT_CARE` means the
application has no preference.
The `GLFW_SRGB_CAPABLE` hint specifies whether the framebuffer should be
sRGB capable.
The `GLFW_DOUBLEBUFFER` hint specifies whether the framebuffer should be double
buffered. You nearly always want to use double buffering. This is a hard
`GLFW_STEREO` specifies whether to use stereoscopic rendering. This is a hard
constraint.
The `GLFW_REFRESH_RATE` hint specifies the desired refresh rate for full screen
windows. If set to zero, the highest available refresh rate will be used. This
hint is ignored for windowed mode windows.
`GLFW_SAMPLES` specifies the desired number of samples to use for multisampling.
Zero disables multisampling. `GLFW_DONT_CARE` means the application has no
preference.
`GLFW_SRGB_CAPABLE` specifies whether the framebuffer should be sRGB capable.
`GLFW_DOUBLEBUFFER` specifies whether the framebuffer should be double buffered.
You nearly always want to use double buffering. This is a hard constraint.
@subsection window_hints_ctx Context related hints
@subsubsection window_hints_mtr Monitor related hints
The `GLFW_CLIENT_API` hint specifies which client API to create the context
for. Possible values are `GLFW_OPENGL_API` and `GLFW_OPENGL_ES_API`. This is
a hard constraint.
`GLFW_REFRESH_RATE` specifies the desired refresh rate for full screen windows.
If set to zero, the highest available refresh rate will be used. This hint is
ignored for windowed mode windows.
The `GLFW_CONTEXT_VERSION_MAJOR` and `GLFW_CONTEXT_VERSION_MINOR` hints
specify the client API version that the created context must be compatible
with.
For OpenGL, these hints are *not* hard constraints, as they don't have to
match exactly, but @ref glfwCreateWindow will still fail if the resulting
OpenGL version is less than the one requested. It is therefore perfectly
safe to use the default of version 1.0 for legacy code and you may still
get backwards-compatible contexts of version 3.0 and above when available.
@subsubsection window_hints_ctx Context related hints
`GLFW_CLIENT_API` specifies which client API to create the context for.
Possible values are `GLFW_OPENGL_API` and `GLFW_OPENGL_ES_API`. This is a hard
constraint.
`GLFW_CONTEXT_VERSION_MAJOR` and `GLFW_CONTEXT_VERSION_MINOR` specify the client
API version that the created context must be compatible with.
For OpenGL, `GLFW_CONTEXT_VERSION_MAJOR` and `GLFW_CONTEXT_VERSION_MINOR` are
not hard constraints, as they don't have to match exactly, but @ref
glfwCreateWindow will still fail if the resulting OpenGL version is less than
the one requested. It is therefore perfectly safe to use the default of version
1.0 for legacy code and you may still get backwards-compatible contexts of
version 3.0 and above when available.
While there is no way to ask the driver for a context of the highest supported
version, most drivers provide this when you ask GLFW for a version
1.0 context.
version, most drivers provide this when you ask GLFW for a version 1.0 context.
For OpenGL ES, these hints are hard constraints.
For OpenGL ES, `GLFW_CONTEXT_VERSION_MAJOR` and `GLFW_CONTEXT_VERSION_MINOR` are
hard constraints to the extent that OpenGL ES 1.x cannot be returned if 2.0 or
later was requested, and vice versa. This is because OpenGL ES 3.0 and later
versions are backward compatible, but OpenGL ES 2.0 is not.
If an OpenGL context is requested, the `GLFW_OPENGL_FORWARD_COMPAT` hint
specifies whether the OpenGL context should be forward-compatible, i.e. one
where all functionality deprecated in the requested version of OpenGL is
removed. This may only be used if the requested OpenGL version is 3.0 or
above. If another client API is requested, this hint is ignored.
`GLFW_OPENGL_FORWARD_COMPAT` specifies whether the OpenGL context should be
forward-compatible, i.e. one where all functionality deprecated in the requested
version of OpenGL is removed. This may only be used if the requested OpenGL
version is 3.0 or above. If OpenGL S is requested, this hint is ignored.
@note Forward-compatibility is described in detail in the
Forward-compatibility is described in detail in the
[OpenGL Reference Manual](https://www.opengl.org/registry/).
If an OpenGL context is requested, the `GLFW_OPENGL_DEBUG_CONTEXT` hint
specifies whether to create a debug OpenGL context, which may have
additional error and performance issue reporting functionality. If another
client API is requested, this hint is ignored.
`GLFW_OPENGL_DEBUG_CONTEXT` specifies whether to create a debug OpenGL context,
which may have additional error and performance issue reporting functionality.
If OpenGL ES is requested, this hint is ignored.
If an OpenGL context is requested, the `GLFW_OPENGL_PROFILE` hint specifies
which OpenGL profile to create the context for. Possible values are one of
`GLFW_OPENGL_CORE_PROFILE` or `GLFW_OPENGL_COMPAT_PROFILE`, or
`GLFW_OPENGL_ANY_PROFILE` to not request a specific profile. If requesting
an OpenGL version below 3.2, `GLFW_OPENGL_ANY_PROFILE` must be used. If
another client API is requested, this hint is ignored.
`GLFW_OPENGL_PROFILE` specifies which OpenGL profile to create the context for.
Possible values are one of `GLFW_OPENGL_CORE_PROFILE` or
`GLFW_OPENGL_COMPAT_PROFILE`, or `GLFW_OPENGL_ANY_PROFILE` to not request
a specific profile. If requesting an OpenGL version below 3.2,
`GLFW_OPENGL_ANY_PROFILE` must be used. If another OpenGL ES is requested,
this hint is ignored.
@note OpenGL profiles are described in detail in the
OpenGL profiles are described in detail in the
[OpenGL Reference Manual](https://www.opengl.org/registry/).
The `GLFW_CONTEXT_ROBUSTNESS` hint specifies the robustness strategy to be
used by the context. This can be one of `GLFW_NO_RESET_NOTIFICATION` or
`GLFW_CONTEXT_ROBUSTNESS` specifies the robustness strategy to be used by the
context. This can be one of `GLFW_NO_RESET_NOTIFICATION` or
`GLFW_LOSE_CONTEXT_ON_RESET`, or `GLFW_NO_ROBUSTNESS` to not request
a robustness strategy.
The `GLFW_CONTEXT_RELEASE_BEHAVIOR` hint specifies the release behavior to be
`GLFW_CONTEXT_RELEASE_BEHAVIOR` specifies the release behavior to be
used by the context. Possible values are one of `GLFW_ANY_RELEASE_BEHAVIOR`,
`GLFW_RELEASE_BEHAVIOR_FLUSH` or `GLFW_RELEASE_BEHAVIOR_NONE`. If the
behavior is `GLFW_ANY_RELEASE_BEHAVIOR`, the default behavior of the context
@@ -235,48 +245,65 @@ the pipeline will be flushed whenever the context is released from being the
current one. If the behavior is `GLFW_RELEASE_BEHAVIOR_NONE`, the pipeline will
not be flushed on release.
@note Context release behaviors are described in detail by the
Context release behaviors are described in detail by the
[GL_KHR_context_flush_control](https://www.opengl.org/registry/specs/KHR/context_flush_control.txt)
extension.
@subsection window_hints_values Supported and default values
@subsubsection window_hints_values Supported and default values
| Name | Default value | Supported values |
| ------------------------------- | --------------------------- | ----------------------- |
| `GLFW_RESIZABLE` | `GL_TRUE` | `GL_TRUE` or `GL_FALSE` |
| `GLFW_VISIBLE` | `GL_TRUE` | `GL_TRUE` or `GL_FALSE` |
| `GLFW_DECORATED` | `GL_TRUE` | `GL_TRUE` or `GL_FALSE` |
| `GLFW_FOCUSED` | `GL_TRUE` | `GL_TRUE` or `GL_FALSE` |
| `GLFW_AUTO_ICONIFY` | `GL_TRUE` | `GL_TRUE` or `GL_FALSE` |
| `GLFW_FLOATING` | `GL_FALSE` | `GL_TRUE` or `GL_FALSE` |
| `GLFW_RED_BITS` | 8 | 0 to `INT_MAX` or `GLFW_DONT_CARE` |
| `GLFW_GREEN_BITS` | 8 | 0 to `INT_MAX` or `GLFW_DONT_CARE` |
| `GLFW_BLUE_BITS` | 8 | 0 to `INT_MAX` or `GLFW_DONT_CARE` |
| `GLFW_ALPHA_BITS` | 8 | 0 to `INT_MAX` or `GLFW_DONT_CARE` |
| `GLFW_DEPTH_BITS` | 24 | 0 to `INT_MAX` or `GLFW_DONT_CARE` |
| `GLFW_STENCIL_BITS` | 8 | 0 to `INT_MAX` or `GLFW_DONT_CARE` |
| `GLFW_ACCUM_RED_BITS` | 0 | 0 to `INT_MAX` or `GLFW_DONT_CARE` |
| `GLFW_ACCUM_GREEN_BITS` | 0 | 0 to `INT_MAX` or `GLFW_DONT_CARE` |
| `GLFW_ACCUM_BLUE_BITS` | 0 | 0 to `INT_MAX` or `GLFW_DONT_CARE` |
| `GLFW_ACCUM_ALPHA_BITS` | 0 | 0 to `INT_MAX` or `GLFW_DONT_CARE` |
| `GLFW_AUX_BUFFERS` | 0 | 0 to `INT_MAX` or `GLFW_DONT_CARE` |
| `GLFW_SAMPLES` | 0 | 0 to `INT_MAX` or `GLFW_DONT_CARE` |
| `GLFW_REFRESH_RATE` | 0 | 0 to `INT_MAX` or `GLFW_DONT_CARE` |
| `GLFW_STEREO` | `GL_FALSE` | `GL_TRUE` or `GL_FALSE` |
| `GLFW_SRGB_CAPABLE` | `GL_FALSE` | `GL_TRUE` or `GL_FALSE` |
| `GLFW_DOUBLEBUFFER` | `GL_TRUE` | `GL_TRUE` or `GL_FALSE` |
| `GLFW_CLIENT_API` | `GLFW_OPENGL_API` | `GLFW_OPENGL_API` or `GLFW_OPENGL_ES_API` |
| `GLFW_CONTEXT_VERSION_MAJOR` | 1 | Any valid major version number of the chosen client API |
| `GLFW_CONTEXT_VERSION_MINOR` | 0 | Any valid minor version number of the chosen client API |
| `GLFW_CONTEXT_ROBUSTNESS` | `GLFW_NO_ROBUSTNESS` | `GLFW_NO_ROBUSTNESS`, `GLFW_NO_RESET_NOTIFICATION` or `GLFW_LOSE_CONTEXT_ON_RESET` |
| `GLFW_CONTEXT_RELEASE_BEHAVIOR` | `GLFW_ANY_RELEASE_BEHAVIOR` | `GLFW_ANY_RELEASE_BEHAVIOR`, `GLFW_RELEASE_BEHAVIOR_FLUSH` or `GLFW_RELEASE_BEHAVIOR_NONE` |
| `GLFW_OPENGL_FORWARD_COMPAT` | `GL_FALSE` | `GL_TRUE` or `GL_FALSE` |
| `GLFW_OPENGL_DEBUG_CONTEXT` | `GL_FALSE` | `GL_TRUE` or `GL_FALSE` |
| `GLFW_OPENGL_PROFILE` | `GLFW_OPENGL_ANY_PROFILE` | `GLFW_OPENGL_ANY_PROFILE`, `GLFW_OPENGL_COMPAT_PROFILE` or `GLFW_OPENGL_CORE_PROFILE` |
Window hint | Default value | Supported values
------------------------------- | --------------------------- | ----------------
`GLFW_RESIZABLE` | `GL_TRUE` | `GL_TRUE` or `GL_FALSE`
`GLFW_VISIBLE` | `GL_TRUE` | `GL_TRUE` or `GL_FALSE`
`GLFW_DECORATED` | `GL_TRUE` | `GL_TRUE` or `GL_FALSE`
`GLFW_FOCUSED` | `GL_TRUE` | `GL_TRUE` or `GL_FALSE`
`GLFW_AUTO_ICONIFY` | `GL_TRUE` | `GL_TRUE` or `GL_FALSE`
`GLFW_FLOATING` | `GL_FALSE` | `GL_TRUE` or `GL_FALSE`
`GLFW_RED_BITS` | 8 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
`GLFW_GREEN_BITS` | 8 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
`GLFW_BLUE_BITS` | 8 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
`GLFW_ALPHA_BITS` | 8 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
`GLFW_DEPTH_BITS` | 24 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
`GLFW_STENCIL_BITS` | 8 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
`GLFW_ACCUM_RED_BITS` | 0 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
`GLFW_ACCUM_GREEN_BITS` | 0 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
`GLFW_ACCUM_BLUE_BITS` | 0 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
`GLFW_ACCUM_ALPHA_BITS` | 0 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
`GLFW_AUX_BUFFERS` | 0 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
`GLFW_SAMPLES` | 0 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
`GLFW_REFRESH_RATE` | 0 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
`GLFW_STEREO` | `GL_FALSE` | `GL_TRUE` or `GL_FALSE`
`GLFW_SRGB_CAPABLE` | `GL_FALSE` | `GL_TRUE` or `GL_FALSE`
`GLFW_DOUBLEBUFFER` | `GL_TRUE` | `GL_TRUE` or `GL_FALSE`
`GLFW_CLIENT_API` | `GLFW_OPENGL_API` | `GLFW_OPENGL_API` or `GLFW_OPENGL_ES_API`
`GLFW_CONTEXT_VERSION_MAJOR` | 1 | Any valid major version number of the chosen client API
`GLFW_CONTEXT_VERSION_MINOR` | 0 | Any valid minor version number of the chosen client API
`GLFW_CONTEXT_ROBUSTNESS` | `GLFW_NO_ROBUSTNESS` | `GLFW_NO_ROBUSTNESS`, `GLFW_NO_RESET_NOTIFICATION` or `GLFW_LOSE_CONTEXT_ON_RESET`
`GLFW_CONTEXT_RELEASE_BEHAVIOR` | `GLFW_ANY_RELEASE_BEHAVIOR` | `GLFW_ANY_RELEASE_BEHAVIOR`, `GLFW_RELEASE_BEHAVIOR_FLUSH` or `GLFW_RELEASE_BEHAVIOR_NONE`
`GLFW_OPENGL_FORWARD_COMPAT` | `GL_FALSE` | `GL_TRUE` or `GL_FALSE`
`GLFW_OPENGL_DEBUG_CONTEXT` | `GL_FALSE` | `GL_TRUE` or `GL_FALSE`
`GLFW_OPENGL_PROFILE` | `GLFW_OPENGL_ANY_PROFILE` | `GLFW_OPENGL_ANY_PROFILE`, `GLFW_OPENGL_COMPAT_PROFILE` or `GLFW_OPENGL_CORE_PROFILE`
@section window_close Window close flag
@section window_events Window event processing
See @ref input_event in the @ref input.
@section window_properties Window properties and events
@subsection window_userptr User pointer
Each window has a user pointer that can be set with @ref
glfwSetWindowUserPointer and fetched with @ref glfwGetWindowUserPointer. This
can be used for any purpose you need and will not be modified by GLFW throughout
the life-time of the window.
The initial value of the pointer is `NULL`.
@subsection window_close Closing and close flag
When the user attempts to close the window, for example by clicking the close
widget or using a key chord like Alt+F4, the *close flag* of the window is set.
@@ -297,16 +324,16 @@ while (!glfwWindowShouldClose(window))
}
@endcode
If you wish to be notified when the user attempts to close a window, you can set
the close callback with @ref glfwSetWindowCloseCallback. This callback is
called directly *after* the close flag has been set.
If you wish to be notified when the user attempts to close a window, set a close
callback with @ref glfwSetWindowCloseCallback.
@code
glfwSetWindowCloseCallback(window, window_close_callback);
@endcode
The callback function can be used for example to filter close requests and clear
the close flag again unless certain conditions are met.
The callback function is called directly *after* the close flag has been set.
It can be used for example to filter close requests and clear the close flag
again unless certain conditions are met.
@code
void window_close_callback(GLFWwindow* window)
@@ -317,26 +344,27 @@ void window_close_callback(GLFWwindow* window)
@endcode
@section window_size Window size
@subsection window_size Client area size
The size of a window can be changed with @ref glfwSetWindowSize. For windowed
mode windows, this resizes the specified window so that its *client area* has
the specified size. Note that the window system may put limitations on size.
For full screen windows, it selects and sets the video mode most closely
matching the specified size.
mode windows, this resizes the window so that its *client area* has the
specified size. The window system may impose limits on window size. For full
screen windows, it selects and sets the video mode most closely matching the
specified size and the color bit depth and refresh rate hints set at creation.
@code
void glfwSetWindowSize(window, 640, 480);
@endcode
If you wish to be notified when a window is resized, whether by the user or
the system, you can set the size callback with @ref glfwSetWindowSizeCallback.
the system, set a size callback with @ref glfwSetWindowSizeCallback.
@code
glfwSetWindowSizeCallback(window, window_size_callback);
@endcode
The callback function receives the new size of the client area of the window.
The callback function receives the new size of the client area of the window
when it is resized.
@code
void window_size_callback(GLFWwindow* window, int width, int height)
@@ -354,10 +382,24 @@ glfwGetWindowSize(window, &width, &height);
@note Do not pass the window size to `glViewport` or other pixel-based OpenGL
calls. The window size is in screen coordinates, not pixels. Use the
framebuffer size, which is in pixels, for pixel-based calls.
[framebuffer size](@ref window_fbsize), which is in pixels, for pixel-based
calls.
The above functions work with the size of the client area, but decorated windows
typically have title bars and window frames around this rectangle. You can
retrieve the extents of these with @ref glfwGetWindowFrameSize.
@code
int left, top, right, bottom;
glfwGetWindowFrameSize(window, &left, &top, &right, &bottom);
@endcode
The returned values are the distances, in screen coordinates, from the edges of
the client area to the corresponding edges of the full window. As they are
distances and not coordinates, they are always zero or positive.
@section window_fbsize Window framebuffer size
@subsection window_fbsize Framebuffer size
While the size of a window is measured in screen coordinates, OpenGL works with
pixels. The size you pass into `glViewport`, for example, should be in pixels
@@ -367,15 +409,15 @@ a second set of functions to retrieve the size in pixels of the framebuffer of
a window.
If you wish to be notified when the framebuffer of a window is resized, whether
by the user or the system, you can set the size callback with @ref
by the user or the system, set a size callback with @ref
glfwSetFramebufferSizeCallback.
@code
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
@endcode
The callback function receives the new size of the client area of the window,
which can for example be used to update the OpenGL viewport.
The callback function receives the new size of the framebuffer when it is
resized, which can for example be used to update the OpenGL viewport.
@code
void framebuffer_size_callback(GLFWwindow* window, int width, int height)
@@ -398,26 +440,26 @@ a window, for example if the window is dragged between a regular monitor and
a high-DPI one.
@section window_pos Window position
@subsection window_pos Position
The position of a windowed-mode window can be changed with @ref
glfwSetWindowPos. This moves the window so that the upper-left corner of its
client area has the specified screen coordinates. Note that the window system
may put limitations on placement.
client area has the specified screen coordinates. The window system may put
limitats on window placement.
@code
glfwSetWindowPos(window, 100, 100);
@endcode
If you wish to be notified when a window is moved, whether by the user or
the system, you can set the position callback with @ref glfwSetWindowPosCallback.
If you wish to be notified when a window is moved, whether by the user, system
or your own code, set a position callback with @ref glfwSetWindowPosCallback.
@code
glfwSetWindowPosCallback(window, window_pos_callback);
@endcode
The callback function receives the new position of the upper-left corner of its
client area.
The callback function receives the new position of the upper-left corner of the
client area when the window is moved.
@code
void window_pos_callback(GLFWwindow* window, int xpos, int ypos)
@@ -434,31 +476,190 @@ glfwGetWindowPos(window, &xpos, &ypos);
@endcode
@section window_title Window title
@subsection window_title Title
All GLFW windows have a title, although undecorated or full screen windows may
not display it or only display it in a task bar or similar interface. To change
the title of a window, use @ref glfwSetWindowTitle.
not display it or only display it in a task bar or similar interface. You can
set a UTF-8 encoded window title with @ref glfwSetWindowTitle.
@code
glfwSetWindowTitle(window, "My Window");
@endcode
The window title is a regular C string using the UTF-8 encoding. This means
for example that, as long as your source file is encoded as UTF-8, you can use
any Unicode characters.
The specified string is copied before the function returns, so there is no need
to keep it around.
As long as your source file is encoded as UTF-8, you can use any Unicode
characters directly in the source.
@code
glfwSetWindowTitle(window, "さよなら絶望先生");
glfwSetWindowTitle(window, "ヒカルの碁");
@endcode
@section window_attribs Window attributes
@subsection window_monitor Monitor
Full screen windows are associated with a specific monitor. You can get the
handle for this monitor with @ref glfwGetWindowMonitor.
@code
GLFWmonitor* monitor = glfwGetWindowMonitor(window);
@endcode
This monitor handle is one of those returned by @ref glfwGetMonitors.
For windowed mode windows, this function returns `NULL`. This is the
recommended way to tell full screen windows from windowed mode windows.
@subsection window_iconify Iconification
Windows can be iconified (i.e. minimized) with @ref glfwIconifyWindow.
@code
glfwIconifyWindow(window);
@endcode
When a full screen window is iconified, the original video mode of its monitor
is restored until the user or application restores the window.
Iconified windows can be restored with @ref glfwRestoreWindow.
@code
glfwRestoreWindow(window);
@endcode
When a full screen window is restored, the desired video mode is restored to its
monitor as well.
If you wish to be notified when a window is iconified or restored, whether by
the user, system or your own code, set a iconify callback with @ref
glfwSetWindowIconifyCallback.
@code
glfwSetWindowIconifyCallback(window, window_iconify_callback);
@endcode
The callback function receives changes in the iconification state of the window.
@code
void window_iconify_callback(GLFWwindow* window, int iconified)
{
if (iconified)
{
// The window was iconified
}
else
{
// The window was restored
}
}
@endcode
You can also get the iconification state with @ref glfwGetWindowAttrib.
@code
int iconified = glfwGetWindowAttrib(window, GLFW_ICONIFIED);
@endcode
@subsection window_hide Visibility
Windowed mode windows can be hidden with @ref glfwHideWindow.
@code
glfwHideWindow(window);
@endcode
This makes the window completely invisible to the user, including removing it
from the task bar, dock or window list. Full screen windows cannot be hidden
and calling @ref glfwHideWindow on a full screen window does nothing.
Hidden windows can be shown with @ref glfwShowWindow.
@code
glfwShowWindow(window);
@endcode
Windowed mode windows can be created initially hidden with the `GLFW_VISIBLE`
[window hint](@ref window_hints_wnd). Windows created hidden are completely
invisible to the user until shown. This can be useful if you need to set up
your window further before showing it, for example moving it to a specific
location.
You can also get the visibility state with @ref glfwGetWindowAttrib.
@code
int visible = glfwGetWindowAttrib(window, GLFW_VISIBLE);
@endcode
@subsection window_focus Input focus
If you wish to be notified when a window gains or loses focus, whether by
the user, system or your own code, set a focus callback with @ref
glfwSetWindowFocusCallback.
@code
glfwSetWindowFocusCallback(window, window_focus_callback);
@endcode
The callback function receives changes in the focus state of the window.
@code
void window_focus_callback(GLFWwindow* window, int focused)
{
if (focused)
{
// The window gained focus
}
else
{
// The window lost focus
}
}
@endcode
You can also get the focus state with @ref glfwGetWindowAttrib.
@code
int focused = glfwGetWindowAttrib(window, GLFW_FOCUSED);
@endcode
@subsection window_refresh Damage and refresh
If you wish to be notified when the contents of a window is damaged and needs
to be refreshed, set a window refresh callback with @ref
glfwSetWindowRefreshCallback.
@code
glfwSetWindowRefreshCallback(m_handle, window_refresh_callback);
@endcode
The callback function is called when the contents of the window needs to be
refreshed.
@code
void window_refresh_callback(GLFWwindow* window)
{
draw_editor_ui(window);
glfwSwapBuffers(window);
}
@endcode
@note On compositing window systems such as Aero, Compiz or Aqua, where the
window contents are saved off-screen, this callback may be called only very
infrequently or never at all.
@subsection window_attribs Attributes
Windows have a number of attributes that can be returned using @ref
glfwGetWindowAttrib. Some reflect state that may change during the lifetime of
the window, while others reflect the corresponding hints and are fixed at the
time of creation.
time of creation. Some are related to the actual window and others to its
context.
@code
if (glfwGetWindowAttrib(window, GLFW_FOCUSED))
@@ -468,61 +669,58 @@ if (glfwGetWindowAttrib(window, GLFW_FOCUSED))
@endcode
@subsection window_attribs_window Window attributes
@subsubsection window_attribs_window Window related attributes
The `GLFW_FOCUSED` attribute indicates whether the specified window currently
has input focus.
`GLFW_FOCUSED` indicates whether the specified window has input focus.
The `GLFW_ICONIFIED` attribute indicates whether the specified window is
currently iconified, whether by the user or with @ref glfwIconifyWindow.
`GLFW_ICONIFIED` indicates whether the specified window is iconified, whether by
the user or with @ref glfwIconifyWindow.
The `GLFW_VISIBLE` attribute indicates whether the specified window is currently
visible. Window visibility can be controlled with @ref glfwShowWindow and @ref
glfwHideWindow and initial visibility is controlled by the
[window hint](@ref window_hints) with the same name.
`GLFW_VISIBLE` indicates whether the specified window is visible. Window
visibility can be controlled with @ref glfwShowWindow and @ref glfwHideWindow
and initial visibility is controlled by the [window hint](@ref window_hints)
with the same name.
The `GLFW_RESIZABLE` attribute indicates whether the specified window is
resizable *by the user*. This is controlled by the
[window hint](@ref window_hints) with the same name.
`GLFW_RESIZABLE` indicates whether the specified window is resizable *by the
user*. This is controlled by the [window hint](@ref window_hints) with the same
name.
The `GLFW_DECORATED` attribute indicates whether the specified window has
decorations such as a border, a close widget, etc. This is controlled by the
`GLFW_DECORATED` indicates whether the specified window has decorations such as
a border, a close widget, etc. This is controlled by the
[window hint](@ref window_hints) with the same name.
The `GLFW_FLOATING` attribute indicates whether the specified window is
floating, also called topmost or always-on-top. This is controlled by the
`GLFW_FLOATING` indicates whether the specified window is floating, also called
topmost or always-on-top. This is controlled by the
[window hint](@ref window_hints) with the same name.
@subsection window_attribs_context Context attributes
@subsubsection window_attribs_context Context related attributes
The `GLFW_CLIENT_API` attribute indicates the client API provided by the
window's context; either `GLFW_OPENGL_API` or `GLFW_OPENGL_ES_API`.
`GLFW_CLIENT_API` indicates the client API provided by the window's context;
either `GLFW_OPENGL_API` or `GLFW_OPENGL_ES_API`.
The `GLFW_CONTEXT_VERSION_MAJOR`, `GLFW_CONTEXT_VERSION_MINOR` and
`GLFW_CONTEXT_REVISION` attributes indicate the client API version of the
window's context.
`GLFW_CONTEXT_VERSION_MAJOR`, `GLFW_CONTEXT_VERSION_MINOR` and
`GLFW_CONTEXT_REVISION` indicate the client API version of the window's context.
The `GLFW_OPENGL_FORWARD_COMPAT` attribute is `GL_TRUE` if the window's
context is an OpenGL forward-compatible one, or `GL_FALSE` otherwise.
`GLFW_OPENGL_FORWARD_COMPAT` is `GL_TRUE` if the window's context is an OpenGL
forward-compatible one, or `GL_FALSE` otherwise.
The `GLFW_OPENGL_DEBUG_CONTEXT` attribute is `GL_TRUE` if the window's
context is an OpenGL debug context, or `GL_FALSE` otherwise.
`GLFW_OPENGL_DEBUG_CONTEXT` is `GL_TRUE` if the window's context is an OpenGL
debug context, or `GL_FALSE` otherwise.
The `GLFW_OPENGL_PROFILE` attribute indicates the OpenGL profile used by the
context. This is `GLFW_OPENGL_CORE_PROFILE` or `GLFW_OPENGL_COMPAT_PROFILE`
if the context uses a known profile, or `GLFW_OPENGL_ANY_PROFILE` if the
OpenGL profile is unknown or the context is for another client API. Note that
the returned profile may not match the profile bits of the context flags, as
GLFW will try other means of detecting the profile when no bits are set.
`GLFW_OPENGL_PROFILE` indicates the OpenGL profile used by the context. This is
`GLFW_OPENGL_CORE_PROFILE` or `GLFW_OPENGL_COMPAT_PROFILE` if the context uses
a known profile, or `GLFW_OPENGL_ANY_PROFILE` if the OpenGL profile is unknown
or the context is an OpenGL ES context. Note that the returned profile may not
match the profile bits of the context flags, as GLFW will try other means of
detecting the profile when no bits are set.
The `GLFW_CONTEXT_ROBUSTNESS` attribute indicates the robustness strategy
used by the context. This is `GLFW_LOSE_CONTEXT_ON_RESET` or
`GLFW_NO_RESET_NOTIFICATION` if the window's context supports robustness, or
`GLFW_NO_ROBUSTNESS` otherwise.
`GLFW_CONTEXT_ROBUSTNESS` indicates the robustness strategy used by the context.
This is `GLFW_LOSE_CONTEXT_ON_RESET` or `GLFW_NO_RESET_NOTIFICATION` if the
window's context supports robustness, or `GLFW_NO_ROBUSTNESS` otherwise.
@section window_swap Swapping buffers
@section window_swap Buffer swapping
GLFW windows are by default double buffered. That means that you have two
rendering buffers; a front buffer and a back buffer. The front buffer is
@@ -538,7 +736,8 @@ glfwSwapBuffers(window);
Sometimes it can be useful to select when the buffer swap will occur. With the
function @ref glfwSwapInterval it is possible to select the minimum number of
monitor refreshes the driver should wait before swapping the buffers:
monitor refreshes the driver wait should from the time @ref glfwSwapBuffers was
called before swapping the buffers:
@code
glfwSwapInterval(1);