mirror of
https://github.com/gwm17/glfw.git
synced 2024-11-23 02:38:52 -05:00
baf574494d
This removes the (undocumented) behavior where glfwShowWindow would bring the window to front and set input focus. That function now does what it says.
918 lines
34 KiB
Plaintext
918 lines
34 KiB
Plaintext
/*!
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@page window_guide Window guide
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@tableofcontents
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This guide introduces the window related functions of GLFW. For details on
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a specific function, see the [reference documentation](@ref window). There are
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also guides for the other areas of GLFW.
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- @ref intro_guide
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- @ref context_guide
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- @ref monitor_guide
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- @ref input_guide
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@section window_object Window objects
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The @ref GLFWwindow object encapsulates both a window and a context. They are
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created with @ref glfwCreateWindow and destroyed with @ref glfwDestroyWindow, or
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@ref glfwTerminate, if any remain. As the window and context are inseparably
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linked, the object pointer is used as both a context and window handle.
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To see the event stream provided to the various window related callbacks, run
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the `events` test program.
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@subsection window_creation Window creation
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A window and its OpenGL or OpenGL ES context are created with @ref
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glfwCreateWindow, which returns a handle to the created window object. For
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example, this creates a 640 by 480 windowed mode window:
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@code
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GLFWwindow* window = glfwCreateWindow(640, 480, "My Title", NULL, NULL);
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@endcode
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If window creation fails, `NULL` will be returned, so it is necessary to check
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the return value.
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The window handle is passed to all window related functions and is provided to
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along with all input events, so event handlers can tell which window received
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the event.
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@subsubsection window_full_screen Full screen windows
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To create a full screen window, you need to specify which monitor the window
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should use. In most cases, the user's primary monitor is a good choice.
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For more information about retrieving monitors, see @ref monitor_monitors.
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@code
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GLFWwindow* window = glfwCreateWindow(640, 480, "My Title", glfwGetPrimaryMonitor(), NULL);
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@endcode
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Full screen windows cover the entire display area of a monitor, have no border
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or decorations.
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Each field of the @ref GLFWvidmode structure corresponds to a function parameter
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or window hint and combine to form the _desired video mode_ for that window.
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The supported video mode most closely matching the desired video mode will be
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set for the chosen monitor as long as the window has input focus. For more
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information about retrieving video modes, see @ref monitor_modes.
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Video mode field | Corresponds to
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----------------------- | ------------------------
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GLFWvidmode.width | `width` parameter
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GLFWvidmode.height | `height` parameter
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GLFWvidmode.redBits | `GLFW_RED_BITS` hint
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GLFWvidmode.greenBits | `GLFW_GREEN_BITS` hint
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GLFWvidmode.blueBits | `GLFW_BLUE_BITS` hint
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GLFWvidmode.refreshRate | `GLFW_REFRESH_RATE` hint
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Once you have a full screen window, you can change its resolution with @ref
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glfwSetWindowSize. The new video mode will be selected and set the same way as
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the video mode chosen by @ref glfwCreateWindow.
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By default, the original video mode of the monitor will be restored and the
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window iconified if it loses input focus, to allow the user to switch back to
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the desktop. This behavior can be disabled with the `GLFW_AUTO_ICONIFY` window
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hint, for example if you wish to simultaneously cover multiple windows with full
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screen windows.
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@subsubsection window_windowed_full_screen "Windowed full screen" windows
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If the closest match for the desired video mode is the current one, the video
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mode will not be changed, making window creation faster and application
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switching much smoother. This is sometimes called _windowed full screen_ or
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_borderless full screen_ window and counts as a full screen window. To create
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such a window, simply request the current video mode.
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@code
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const GLFWvidmode* mode = glfwGetVideoMode(monitor);
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glfwWindowHint(GLFW_RED_BITS, mode->redBits);
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glfwWindowHint(GLFW_GREEN_BITS, mode->greenBits);
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glfwWindowHint(GLFW_BLUE_BITS, mode->blueBits);
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glfwWindowHint(GLFW_REFRESH_RATE, mode->refreshRate);
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GLFWwindow* window = glfwCreateWindow(mode->width, mode->height, "My Title", monitor, NULL);
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@endcode
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@subsection window_destruction Window destruction
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When a window is no longer needed, destroy it with @ref glfwDestroyWindow.
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@code
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glfwDestroyWindow(window);
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@endcode
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Window destruction always succeeds. Before the actual destruction, all
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callbacks are removed so no further events will be delivered for the window.
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All windows remaining when @ref glfwTerminate is called are destroyed as well.
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When a full screen window is destroyed, the original video mode of its monitor
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is restored, but the gamma ramp is left untouched.
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@subsection window_hints Window creation hints
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There are a number of hints that can be set before the creation of a window and
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context. Some affect the window itself, others affect the framebuffer or
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context. These hints are set to their default values each time the library is
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initialized with @ref glfwInit, can be set individually with @ref glfwWindowHint
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and reset all at once to their defaults with @ref glfwDefaultWindowHints.
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Note that hints need to be set _before_ the creation of the window and context
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you wish to have the specified attributes.
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@subsubsection window_hints_hard Hard and soft constraints
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Some window hints are hard constraints. These must match the available
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capabilities _exactly_ for window and context creation to succeed. Hints
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that are not hard constraints are matched as closely as possible, but the
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resulting context and framebuffer may differ from what these hints requested.
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The following hints are always hard constraints:
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- `GLFW_STEREO`
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- `GLFW_DOUBLEBUFFER`
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- `GLFW_CLIENT_API`
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The following additional hints are hard constraints when requesting an OpenGL
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context, but are ignored when requesting an OpenGL ES context:
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- `GLFW_OPENGL_FORWARD_COMPAT`
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- `GLFW_OPENGL_PROFILE`
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@subsubsection window_hints_wnd Window related hints
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`GLFW_RESIZABLE` specifies whether the windowed mode window will be resizable
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_by the user_. The window will still be resizable using the @ref
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glfwSetWindowSize function. This hint is ignored for full screen windows.
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`GLFW_VISIBLE` specifies whether the windowed mode window will be initially
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visible. This hint is ignored for full screen windows.
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`GLFW_DECORATED` specifies whether the windowed mode window will have window
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decorations such as a border, a close widget, etc. An undecorated window may
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still allow the user to generate close events on some platforms. This hint is
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ignored for full screen windows.
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`GLFW_FOCUSED` specifies whether the windowed mode window will be given input
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focus when created. This hint is ignored for full screen and initially hidden
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windows.
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`GLFW_AUTO_ICONIFY` specifies whether the full screen window will
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automatically iconify and restore the previous video mode on input focus loss.
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This hint is ignored for windowed mode windows.
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`GLFW_FLOATING` specifies whether the windowed mode window will be floating
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above other regular windows, also called topmost or always-on-top. This is
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intended primarily for debugging purposes and cannot be used to implement proper
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full screen windows. This hint is ignored for full screen windows.
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`GLFW_MAXIMIZED` specifies whether the windowed mode window will be maximized
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when created. This hint is ignored for full screen windows.
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@subsubsection window_hints_fb Framebuffer related hints
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`GLFW_RED_BITS`, `GLFW_GREEN_BITS`, `GLFW_BLUE_BITS`, `GLFW_ALPHA_BITS`,
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`GLFW_DEPTH_BITS` and `GLFW_STENCIL_BITS` specify the desired bit depths of the
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various components of the default framebuffer. `GLFW_DONT_CARE` means the
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application has no preference.
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`GLFW_ACCUM_RED_BITS`, `GLFW_ACCUM_GREEN_BITS`, `GLFW_ACCUM_BLUE_BITS` and
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`GLFW_ACCUM_ALPHA_BITS` specify the desired bit depths of the various components
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of the accumulation buffer. `GLFW_DONT_CARE` means the application has no
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preference.
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@par
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Accumulation buffers are a legacy OpenGL feature and should not be used in new
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code.
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`GLFW_AUX_BUFFERS` specifies the desired number of auxiliary buffers.
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`GLFW_DONT_CARE` means the application has no preference.
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@par
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Auxiliary buffers are a legacy OpenGL feature and should not be used in new
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code.
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`GLFW_STEREO` specifies whether to use stereoscopic rendering. This is a hard
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constraint.
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`GLFW_SAMPLES` specifies the desired number of samples to use for multisampling.
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Zero disables multisampling. `GLFW_DONT_CARE` means the application has no
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preference.
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`GLFW_SRGB_CAPABLE` specifies whether the framebuffer should be sRGB capable.
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If supported, a created OpenGL context will support the `GL_FRAMEBUFFER_SRGB`
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enable, also called `GL_FRAMEBUFFER_SRGB_EXT`) for controlling sRGB rendering
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and a created OpenGL ES context will always have sRGB rendering enabled.
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`GLFW_DOUBLEBUFFER` specifies whether the framebuffer should be double buffered.
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You nearly always want to use double buffering. This is a hard constraint.
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@subsubsection window_hints_mtr Monitor related hints
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`GLFW_REFRESH_RATE` specifies the desired refresh rate for full screen windows.
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If set to `GLFW_DONT_CARE`, the highest available refresh rate will be used.
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This hint is ignored for windowed mode windows.
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@subsubsection window_hints_ctx Context related hints
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`GLFW_CLIENT_API` specifies which client API to create the context for.
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Possible values are `GLFW_OPENGL_API`, `GLFW_OPENGL_ES_API` and `GLFW_NO_API`.
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This is a hard constraint.
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`GLFW_CONTEXT_VERSION_MAJOR` and `GLFW_CONTEXT_VERSION_MINOR` specify the client
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API version that the created context must be compatible with. The exact
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behavior of these hints depend on the requested client API.
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@par
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__OpenGL:__ `GLFW_CONTEXT_VERSION_MAJOR` and `GLFW_CONTEXT_VERSION_MINOR` are not hard
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constraints, but creation will fail if the OpenGL version of the created context
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is less than the one requested. It is therefore perfectly safe to use the
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default of version 1.0 for legacy code and you may still get
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backwards-compatible contexts of version 3.0 and above when available.
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@par
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While there is no way to ask the driver for a context of the highest supported
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version, GLFW will attempt to provide this when you ask for a version 1.0
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context, which is the default for these hints.
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@par
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__OpenGL ES:__ `GLFW_CONTEXT_VERSION_MAJOR` and `GLFW_CONTEXT_VERSION_MINOR` are not hard
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constraints, but creation will fail if the OpenGL ES version of the created
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context is less than the one requested. Additionally, OpenGL ES 1.x cannot be
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returned if 2.0 or later was requested, and vice versa. This is because OpenGL
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ES 3.x is backward compatible with 2.0, but OpenGL ES 2.0 is not backward
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compatible with 1.x.
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`GLFW_OPENGL_FORWARD_COMPAT` specifies whether the OpenGL context should be
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forward-compatible, i.e. one where all functionality deprecated in the requested
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version of OpenGL is removed. This must only be used if the requested OpenGL
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version is 3.0 or above. If OpenGL ES is requested, this hint is ignored.
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@par
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Forward-compatibility is described in detail in the
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[OpenGL Reference Manual](https://www.opengl.org/registry/).
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`GLFW_OPENGL_DEBUG_CONTEXT` specifies whether to create a debug OpenGL context,
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which may have additional error and performance issue reporting functionality.
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If OpenGL ES is requested, this hint is ignored.
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`GLFW_OPENGL_PROFILE` specifies which OpenGL profile to create the context for.
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Possible values are one of `GLFW_OPENGL_CORE_PROFILE` or
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`GLFW_OPENGL_COMPAT_PROFILE`, or `GLFW_OPENGL_ANY_PROFILE` to not request
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a specific profile. If requesting an OpenGL version below 3.2,
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`GLFW_OPENGL_ANY_PROFILE` must be used. If OpenGL ES is requested,
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this hint is ignored.
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@par
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OpenGL profiles are described in detail in the
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[OpenGL Reference Manual](https://www.opengl.org/registry/).
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`GLFW_CONTEXT_ROBUSTNESS` specifies the robustness strategy to be used by the
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context. This can be one of `GLFW_NO_RESET_NOTIFICATION` or
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`GLFW_LOSE_CONTEXT_ON_RESET`, or `GLFW_NO_ROBUSTNESS` to not request
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a robustness strategy.
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`GLFW_CONTEXT_RELEASE_BEHAVIOR` specifies the release behavior to be
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used by the context. Possible values are one of `GLFW_ANY_RELEASE_BEHAVIOR`,
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`GLFW_RELEASE_BEHAVIOR_FLUSH` or `GLFW_RELEASE_BEHAVIOR_NONE`. If the
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behavior is `GLFW_ANY_RELEASE_BEHAVIOR`, the default behavior of the context
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creation API will be used. If the behavior is `GLFW_RELEASE_BEHAVIOR_FLUSH`,
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the pipeline will be flushed whenever the context is released from being the
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current one. If the behavior is `GLFW_RELEASE_BEHAVIOR_NONE`, the pipeline will
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not be flushed on release.
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@par
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Context release behaviors are described in detail by the
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[GL_KHR_context_flush_control](https://www.opengl.org/registry/specs/KHR/context_flush_control.txt)
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extension.
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`GLFW_CONTEXT_NO_ERROR` specifies whether errors should be generated by the
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context. If enabled, situations that would have generated errors instead cause
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undefined behavior.
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@par
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The no error mode for OpenGL and OpenGL ES is described in detail by the
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[GL_KHR_no_error](https://www.opengl.org/registry/specs/KHR/no_error.txt)
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extension.
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@note This hint is experimental in its current state. There are currently
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(October 2015) no corresponding WGL or GLX extensions. That makes this hint
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a [hard constraint](@ref window_hints_hard) for those backends, as creation will
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fail if unsupported context flags are requested. Once the extensions are
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available, they will be required and creation of `GL_KHR_no_error` contexts may
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fail on early drivers where this flag is supported without those extensions
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being listed.
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@subsubsection window_hints_values Supported and default values
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Window hint | Default value | Supported values
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------------------------------- | --------------------------- | ----------------
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`GLFW_RESIZABLE` | `GLFW_TRUE` | `GLFW_TRUE` or `GLFW_FALSE`
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`GLFW_VISIBLE` | `GLFW_TRUE` | `GLFW_TRUE` or `GLFW_FALSE`
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`GLFW_DECORATED` | `GLFW_TRUE` | `GLFW_TRUE` or `GLFW_FALSE`
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`GLFW_FOCUSED` | `GLFW_TRUE` | `GLFW_TRUE` or `GLFW_FALSE`
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`GLFW_AUTO_ICONIFY` | `GLFW_TRUE` | `GLFW_TRUE` or `GLFW_FALSE`
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`GLFW_FLOATING` | `GLFW_FALSE` | `GLFW_TRUE` or `GLFW_FALSE`
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`GLFW_MAXIMIZED` | `GLFW_FALSE` | `GLFW_TRUE` or `GLFW_FALSE`
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`GLFW_RED_BITS` | 8 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
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`GLFW_GREEN_BITS` | 8 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
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`GLFW_BLUE_BITS` | 8 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
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`GLFW_ALPHA_BITS` | 8 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
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`GLFW_DEPTH_BITS` | 24 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
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`GLFW_STENCIL_BITS` | 8 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
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`GLFW_ACCUM_RED_BITS` | 0 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
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`GLFW_ACCUM_GREEN_BITS` | 0 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
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`GLFW_ACCUM_BLUE_BITS` | 0 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
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`GLFW_ACCUM_ALPHA_BITS` | 0 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
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`GLFW_AUX_BUFFERS` | 0 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
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`GLFW_SAMPLES` | 0 | 0 to `INT_MAX` or `GLFW_DONT_CARE`
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`GLFW_REFRESH_RATE` | `GLFW_DONT_CARE` | 0 to `INT_MAX` or `GLFW_DONT_CARE`
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`GLFW_STEREO` | `GLFW_FALSE` | `GLFW_TRUE` or `GLFW_FALSE`
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`GLFW_SRGB_CAPABLE` | `GLFW_FALSE` | `GLFW_TRUE` or `GLFW_FALSE`
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`GLFW_DOUBLEBUFFER` | `GLFW_TRUE` | `GLFW_TRUE` or `GLFW_FALSE`
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`GLFW_CLIENT_API` | `GLFW_OPENGL_API` | `GLFW_OPENGL_API`, `GLFW_OPENGL_ES_API` or `GLFW_NO_API`
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`GLFW_CONTEXT_VERSION_MAJOR` | 1 | Any valid major version number of the chosen client API
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`GLFW_CONTEXT_VERSION_MINOR` | 0 | Any valid minor version number of the chosen client API
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`GLFW_CONTEXT_ROBUSTNESS` | `GLFW_NO_ROBUSTNESS` | `GLFW_NO_ROBUSTNESS`, `GLFW_NO_RESET_NOTIFICATION` or `GLFW_LOSE_CONTEXT_ON_RESET`
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`GLFW_CONTEXT_RELEASE_BEHAVIOR` | `GLFW_ANY_RELEASE_BEHAVIOR` | `GLFW_ANY_RELEASE_BEHAVIOR`, `GLFW_RELEASE_BEHAVIOR_FLUSH` or `GLFW_RELEASE_BEHAVIOR_NONE`
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`GLFW_OPENGL_FORWARD_COMPAT` | `GLFW_FALSE` | `GLFW_TRUE` or `GLFW_FALSE`
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`GLFW_OPENGL_DEBUG_CONTEXT` | `GLFW_FALSE` | `GLFW_TRUE` or `GLFW_FALSE`
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`GLFW_OPENGL_PROFILE` | `GLFW_OPENGL_ANY_PROFILE` | `GLFW_OPENGL_ANY_PROFILE`, `GLFW_OPENGL_COMPAT_PROFILE` or `GLFW_OPENGL_CORE_PROFILE`
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@section window_events Window event processing
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See @ref events.
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@section window_properties Window properties and events
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@subsection window_userptr User pointer
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Each window has a user pointer that can be set with @ref
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glfwSetWindowUserPointer and fetched with @ref glfwGetWindowUserPointer. This
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can be used for any purpose you need and will not be modified by GLFW throughout
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the life-time of the window.
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The initial value of the pointer is `NULL`.
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@subsection window_close Window closing and close flag
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When the user attempts to close the window, for example by clicking the close
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widget or using a key chord like Alt+F4, the _close flag_ of the window is set.
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The window is however not actually destroyed and, unless you watch for this
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state change, nothing further happens.
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The current state of the close flag is returned by @ref glfwWindowShouldClose
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and can be set or cleared directly with @ref glfwSetWindowShouldClose. A common
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pattern is to use the close flag as a main loop condition.
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@code
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while (!glfwWindowShouldClose(window))
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{
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render(window);
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glfwSwapBuffers(window);
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glfwPollEvents();
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}
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@endcode
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If you wish to be notified when the user attempts to close a window, set a close
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callback.
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@code
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glfwSetWindowCloseCallback(window, window_close_callback);
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@endcode
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The callback function is called directly _after_ the close flag has been set.
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It can be used for example to filter close requests and clear the close flag
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again unless certain conditions are met.
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@code
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void window_close_callback(GLFWwindow* window)
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{
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if (!time_to_close)
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glfwSetWindowShouldClose(window, GLFW_FALSE);
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}
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@endcode
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@subsection window_size Window size
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The size of a window can be changed with @ref glfwSetWindowSize. For windowed
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mode windows, this sets the size, in
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[screen coordinates](@ref coordinate_systems) of the _client area_ or _content
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area_ of the window. The window system may impose limits on window size.
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@code
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glfwSetWindowSize(window, 640, 480);
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@endcode
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For full screen windows, the specified size becomes the new resolution of the
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window's *desired video mode*. The video mode most closely matching the new
|
|
desired video mode is set immediately. The window is resized to fit the
|
|
resolution of the set video mode.
|
|
|
|
If you wish to be notified when a window is resized, whether by the user or
|
|
the system, set a size callback.
|
|
|
|
@code
|
|
glfwSetWindowSizeCallback(window, window_size_callback);
|
|
@endcode
|
|
|
|
The callback function receives the new size, in screen coordinates, of the
|
|
client area of the window when it is resized.
|
|
|
|
@code
|
|
void window_size_callback(GLFWwindow* window, int width, int height)
|
|
{
|
|
}
|
|
@endcode
|
|
|
|
There is also @ref glfwGetWindowSize for directly retrieving the current size of
|
|
a window.
|
|
|
|
@code
|
|
int width, height;
|
|
glfwGetWindowSize(window, &width, &height);
|
|
@endcode
|
|
|
|
@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](@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.
|
|
|
|
|
|
@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.
|
|
On some machines screen coordinates and pixels are the same, but on others they
|
|
will not be. There is 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, set a size callback.
|
|
|
|
@code
|
|
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
|
|
@endcode
|
|
|
|
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)
|
|
{
|
|
glViewport(0, 0, width, height);
|
|
}
|
|
@endcode
|
|
|
|
There is also @ref glfwGetFramebufferSize for directly retrieving the current
|
|
size of the framebuffer of a window.
|
|
|
|
@code
|
|
int width, height;
|
|
glfwGetFramebufferSize(window, &width, &height);
|
|
glViewport(0, 0, width, height);
|
|
@endcode
|
|
|
|
The size of a framebuffer may change independently of the size of a window, for
|
|
example if the window is dragged between a regular monitor and a high-DPI one.
|
|
|
|
|
|
@subsection window_sizelimits Window size limits
|
|
|
|
The minimum and maximum size of the client area of a windowed mode window can be
|
|
enforced with @ref glfwSetWindowSizeLimits. The user may resize the window to
|
|
any size and aspect ratio within the specified limits, unless the aspect ratio
|
|
is also set.
|
|
|
|
@code
|
|
glfwSetWindowSizeLimits(window, 200, 200, 400, 400);
|
|
@endcode
|
|
|
|
To specify only a minimum size or only a maximum one, set the other pair to
|
|
`GLFW_DONT_CARE`.
|
|
|
|
@code
|
|
glfwSetWindowSizeLimits(window, 640, 480, GLFW_DONT_CARE, GLFW_DONT_CARE);
|
|
@endcode
|
|
|
|
To disable size limits for a window, set them all to `GLFW_DONT_CARE`.
|
|
|
|
The aspect ratio of the client area of a windowed mode window can be enforced
|
|
with @ref glfwSetWindowAspectRatio. The user may resize the window freely
|
|
unless size limits are also set, but the size will be constrained to maintain
|
|
the aspect ratio.
|
|
|
|
@code
|
|
glfwSetWindowAspectRatio(window, 16, 9);
|
|
@endcode
|
|
|
|
The aspect ratio is specified as a numerator and denominator, corresponding to
|
|
the width and height, respectively. If you want a window to maintain its
|
|
current aspect ratio, simply use its current size as the ratio.
|
|
|
|
@code
|
|
int width, height;
|
|
glfwGetWindowSize(window, &width, &height);
|
|
glfwSetWindowAspectRatio(window, width, height);
|
|
@endcode
|
|
|
|
To disable the aspect ratio limit for a window, set both terms to
|
|
`GLFW_DONT_CARE`.
|
|
|
|
You can have both size limits and aspect ratio set for a window, but the results
|
|
are undefined if they conflict.
|
|
|
|
|
|
@subsection window_pos Window 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](@ref coordinate_systems).
|
|
The window system may put limitations on window placement.
|
|
|
|
@code
|
|
glfwSetWindowPos(window, 100, 100);
|
|
@endcode
|
|
|
|
If you wish to be notified when a window is moved, whether by the user, system
|
|
or your own code, set a position callback.
|
|
|
|
@code
|
|
glfwSetWindowPosCallback(window, window_pos_callback);
|
|
@endcode
|
|
|
|
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)
|
|
{
|
|
}
|
|
@endcode
|
|
|
|
There is also @ref glfwGetWindowPos for directly retrieving the current position
|
|
of the client area of the window.
|
|
|
|
@code
|
|
int xpos, ypos;
|
|
glfwGetWindowPos(window, &xpos, &ypos);
|
|
@endcode
|
|
|
|
|
|
@subsection window_title Window 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. You can
|
|
set a UTF-8 encoded window title with @ref glfwSetWindowTitle.
|
|
|
|
@code
|
|
glfwSetWindowTitle(window, "My Window");
|
|
@endcode
|
|
|
|
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, "星を追う子ども");
|
|
@endcode
|
|
|
|
If you are using C++11 or C11, you can use a UTF-8 string literal.
|
|
|
|
@code
|
|
glfwSetWindowTitle(window, u8"This is always a UTF-8 string");
|
|
@endcode
|
|
|
|
|
|
@subsection window_monitor Window 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 Window 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.
|
|
|
|
@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 current iconification state with @ref glfwGetWindowAttrib.
|
|
|
|
@code
|
|
int iconified = glfwGetWindowAttrib(window, GLFW_ICONIFIED);
|
|
@endcode
|
|
|
|
|
|
@subsection window_hide Window 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 current visibility state with @ref glfwGetWindowAttrib.
|
|
|
|
@code
|
|
int visible = glfwGetWindowAttrib(window, GLFW_VISIBLE);
|
|
@endcode
|
|
|
|
|
|
@subsection window_focus Window input focus
|
|
|
|
Windows can be given input focus and brought to the front with @ref
|
|
glfwFocusWindow.
|
|
|
|
@code
|
|
glfwFocusWindow(window);
|
|
@endcode
|
|
|
|
If you wish to be notified when a window gains or loses input focus, whether by
|
|
the user, system or your own code, set a focus callback.
|
|
|
|
@code
|
|
glfwSetWindowFocusCallback(window, window_focus_callback);
|
|
@endcode
|
|
|
|
The callback function receives changes in the input focus state of the window.
|
|
|
|
@code
|
|
void window_focus_callback(GLFWwindow* window, int focused)
|
|
{
|
|
if (focused)
|
|
{
|
|
// The window gained input focus
|
|
}
|
|
else
|
|
{
|
|
// The window lost input focus
|
|
}
|
|
}
|
|
@endcode
|
|
|
|
You can also get the current input focus state with @ref glfwGetWindowAttrib.
|
|
|
|
@code
|
|
int focused = glfwGetWindowAttrib(window, GLFW_FOCUSED);
|
|
@endcode
|
|
|
|
|
|
@subsection window_refresh Window 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.
|
|
|
|
@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 might only be called when
|
|
the window or framebuffer is resized.
|
|
|
|
|
|
@subsection window_attribs Window 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. Some are related to the actual window and others to its
|
|
context.
|
|
|
|
@code
|
|
if (glfwGetWindowAttrib(window, GLFW_FOCUSED))
|
|
{
|
|
// window has input focus
|
|
}
|
|
@endcode
|
|
|
|
|
|
@subsubsection window_attribs_wnd Window related attributes
|
|
|
|
`GLFW_FOCUSED` indicates whether the specified window has input focus. Initial
|
|
input focus is controlled by the [window hint](@ref window_hints_wnd) with the
|
|
same name.
|
|
|
|
`GLFW_ICONIFIED` indicates whether the specified window is iconified, whether by
|
|
the user or with @ref glfwIconifyWindow.
|
|
|
|
`GLFW_MAXIMIZED` indicates whether the specified window is maximized, whether by
|
|
the user or with @ref glfwMaximizeWindow.
|
|
|
|
`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_wnd)
|
|
with the same name.
|
|
|
|
`GLFW_RESIZABLE` indicates whether the specified window is resizable _by the
|
|
user_. This is set on creation with the [window hint](@ref window_hints_wnd)
|
|
with the same name.
|
|
|
|
`GLFW_DECORATED` indicates whether the specified window has decorations such as
|
|
a border, a close widget, etc. This is set on creation with the
|
|
[window hint](@ref window_hints_wnd) with the same name.
|
|
|
|
`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_wnd) with the same name.
|
|
|
|
|
|
@subsubsection window_attribs_ctx Context related attributes
|
|
|
|
`GLFW_CLIENT_API` indicates the client API provided by the window's context;
|
|
either `GLFW_OPENGL_API`, `GLFW_OPENGL_ES_API` or `GLFW_NO_API`.
|
|
|
|
`GLFW_CONTEXT_VERSION_MAJOR`, `GLFW_CONTEXT_VERSION_MINOR` and
|
|
`GLFW_CONTEXT_REVISION` indicate the client API version of the window's context.
|
|
|
|
`GLFW_OPENGL_FORWARD_COMPAT` is `GLFW_TRUE` if the window's context is an OpenGL
|
|
forward-compatible one, or `GLFW_FALSE` otherwise.
|
|
|
|
`GLFW_OPENGL_DEBUG_CONTEXT` is `GLFW_TRUE` if the window's context is an OpenGL
|
|
debug context, or `GLFW_FALSE` otherwise.
|
|
|
|
`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.
|
|
|
|
`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.
|
|
|
|
|
|
@subsubsection window_attribs_fb Framebuffer related attributes
|
|
|
|
The attributes of the default framebuffer (i.e. the framebuffer attached to the
|
|
window) are not provided by this function but can be queried with both OpenGL
|
|
and OpenGL ES.
|
|
|
|
If you are using version 3.0 or later of OpenGL or OpenGL ES, the
|
|
`glGetFramebufferAttachmentParameteriv` function can be used to retrieve the
|
|
number of bits for the red, green, blue, alpha, depth and stencil buffer
|
|
channels. Otherwise, the `glGetIntegerv` function can be used.
|
|
|
|
The number of MSAA samples are always retrieved with `glGetIntegerv`. For
|
|
contexts supporting framebuffer objects, the number of samples of the currently
|
|
bound framebuffer is returned.
|
|
|
|
Attribute | glGetIntegerv | glGetFramebufferAttachmentParameteriv
|
|
------------ | ----------------- | -------------------------------------
|
|
Red bits | `GL_RED_BITS` | `GL_FRAMEBUFFER_ATTACHMENT_RED_SIZE`
|
|
Green bits | `GL_GREEN_BITS` | `GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE`
|
|
Blue bits | `GL_BLUE_BITS` | `GL_FRAMEBUFFER_ATTACHMENT_BLUE_SIZE`
|
|
Alpha bits | `GL_ALPHA_BITS` | `GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE`
|
|
Depth bits | `GL_DEPTH_BITS` | `GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE`
|
|
Stencil bits | `GL_STENCIL_BITS` | `GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE`
|
|
MSAA samples | `GL_SAMPLES` | _Not provided by this function_
|
|
|
|
When calling `glGetFramebufferAttachmentParameteriv`, the red, green, blue and
|
|
alpha sizes can be queried from the `GL_BACK_LEFT`, while the depth and stencil
|
|
sizes can be queried from the `GL_DEPTH` and `GL_STENCIL` attachments,
|
|
respectively.
|
|
|
|
|
|
@section buffer_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
|
|
the one being displayed and the back buffer the one you render to.
|
|
|
|
When the entire frame has been rendered, it is time to swap the back and the
|
|
front buffers in order to display what has been rendered and begin rendering
|
|
a new frame. This is done with @ref glfwSwapBuffers.
|
|
|
|
@code
|
|
glfwSwapBuffers(window);
|
|
@endcode
|
|
|
|
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 wait should from the time @ref glfwSwapBuffers was
|
|
called before swapping the buffers:
|
|
|
|
@code
|
|
glfwSwapInterval(1);
|
|
@endcode
|
|
|
|
If the interval is zero, the swap will take place immediately when @ref
|
|
glfwSwapBuffers is called without waiting for a refresh. Otherwise at least
|
|
interval retraces will pass between each buffer swap. Using a swap interval of
|
|
zero can be useful for benchmarking purposes, when it is not desirable to
|
|
measure the time it takes to wait for the vertical retrace. However, a swap
|
|
interval of one lets you avoid tearing.
|
|
|
|
Note that this may not work on all machines, as some drivers have
|
|
user-controlled settings that override any swap interval the application
|
|
requests.
|
|
|
|
*/
|