mirror of
https://github.com/glfw/glfw.git
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Documentation work.
This commit is contained in:
Camilla Berglund
parent
ad1f6f0341
commit
1f5f20eeef
@ -1,6 +1,57 @@
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/*!
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@page glext OpenGL extension handling
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@page context Context handling guide
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@tableofcontents
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The primary purpose of GLFW is to provide a simple interface to window
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management and OpenGL and OpenGL ES context creation. GLFW supports
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multiple windows, each of which has its own context.
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@section context_object Context handles
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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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@section context_hints Context creation hints
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There are a number of hints, specified using @ref glfwWindowHint, related to
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what kind of context is created. See
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[context related hints](@ref window_hints_ctx) in the window handling guide.
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@section context_current Current context
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Before you can use the OpenGL or OpenGL ES APIs, you need to have a current
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context of the proper type. The context encapsulates all render state and all
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objects like textures and shaders.
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Note that a context can only be current for a single thread at a time, and
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a thread can only have a single context at a time.
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A context is made current with @ref glfwMakeContextCurrent.
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@code
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glfwMakeContextCurrent(window);
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@endcode
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The current context is returned by @ref glfwGetCurrentContext.
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@code
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GLFWwindow* window = glfwGetCurrentContext();
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@endcode
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@section context_swap Swapping buffers
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See [swapping buffers](@ref window_swap) in the window handling guide.
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@section context_glext OpenGL extension handling
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One of the benefits of OpenGL is its extensibility. Independent hardware
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vendors (IHVs) may include functionality in their OpenGL implementations that
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@ -16,10 +67,9 @@ An extension is defined by:
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Note the `ARB` affix, which stands for Architecture Review Board and is used
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for official extensions. There are many different affixes, depending on who
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wrote the extension. A list of extensions, together with their specifications,
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can be found at the
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[OpenGL Registry](http://www.opengl.org/registry/).
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can be found at the [OpenGL Registry](http://www.opengl.org/registry/).
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To use a certain extension, you must first check whether the context exposes
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To use a certain extension, you must first check whether the context supports
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that extension and then, if it introduces new functions, retrieve the pointers
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to those functions.
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@ -31,7 +81,7 @@ the OpenGL API. GLEW in particular has been extensively tested with and works
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well with GLFW.
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@section glext_header The glext.h header
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@subsection context_glext_header The glext.h header
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The `glext.h` header is a continually updated file that defines the interfaces
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for all OpenGL extensions. The latest version of this can always be found at
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@ -42,30 +92,30 @@ you wish to use.
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The header defines function pointer types for all functions of all extensions it
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supports. These have names like `PFNGLGETDEBUGMESSAGELOGARB` (for
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`glGetDebugMessageLogARB`), i.e. the name is made uppercase, the `gl` prefix is
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removed and `PFN` and `PROC` are added to the ends.
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`glGetDebugMessageLogARB`), i.e. the name is made uppercase and `PFN` and `PROC`
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are added to the ends.
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@section glext_string Checking for extensions
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@subsection context_glext_string Checking for extensions
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A given machine may not actually support the extension (it may have older
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drivers or a graphics card that lacks the necessary hardware features), so it
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is necessary to check whether the context exposes the extension. This is done
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is necessary to check whether the context supports the extension. This is done
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with @ref glfwExtensionSupported.
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@code
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if (glfwExtensionSupported("GL_ARB_debug_output"))
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{
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// The extension is exposed by the current context
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// The extension is supported by the current context
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}
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@endcode
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The argument is a null terminated ASCII string with the extension name. If the
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extension is exposed, @ref glfwExtensionSupported returns non-zero, otherwise it
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returns zero.
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extension is supported, @ref glfwExtensionSupported returns non-zero, otherwise
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it returns zero.
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@section glext_proc Fetching function pointers
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@subsection context_glext_proc Fetching function pointers
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Many extensions, though not all, require the use of new OpenGL functions.
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These entry points are often not exposed by your link libraries, making
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@ -89,7 +139,7 @@ when used together.
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#define glGetDebugMessageLogARB pfnGetDebugMessageLog
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PFNGLGETDEBUGMESSAGELOGARB pfnGetDebugMessageLog;
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// Flag indicating whether the extension is present
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// Flag indicating whether the extension is supported
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int has_debug_output = 0;
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void load_extensions(void)
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31
docs/monitor.dox
Normal file
31
docs/monitor.dox
Normal file
@ -0,0 +1,31 @@
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/*!
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@page monitor Multi-monitor guide
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@section monitor_objects Monitor objects
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@section monitor_modes Querying video modes
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Although GLFW generally does a good job at selecting a suitable video
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mode for you when you open a fullscreen window, it is sometimes useful to
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know exactly which modes are available on a certain system. For example,
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you may want to present the user with a list of video modes to select
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from. To get a list of available video modes, you can use the function
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@ref glfwGetVideoModes.
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@code
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int count;
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GLFWvidmode* modes = glfwGetVideoModes(monitor, &count);
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@endcode
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To get the current video mode of a monitor call @ref glfwGetVideoMode.
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@code
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const GLFWvidmode* mode = glfwGetVideoMode(monitor);
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@endcode
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@section monitor_gamma Gamma ramps
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*/
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@ -188,6 +188,15 @@ glfwMakeContextCurrent after creating a window before you can call any OpenGL
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functions.
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@subsection moving_repeat Key repeat
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The `GLFW_KEY_REPEAT` enable has been removed and key repeat is always enabled
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for both keys and characters. A new key action, `GLFW_REPEAT`, has been added
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to allow the [key callback](@ref GLFWkeyfun) to distinguish an initial key press
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from a repeat. Note that @ref glfwGetKey still returns only `GLFW_PRESS` or
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`GLFW_RELEASE`.
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@subsection moving_keys Physical key input
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GLFW 3 key tokens map to physical keys, unlike in GLFW 2 where they mapped to
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@ -208,6 +217,16 @@ having to remember whether to check for `'a'` or `'A'`, you now check for
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`GLFW_KEY_A`.
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@subsection moving_joystick Joystick input
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The `glfwGetJoystickPos` function has been renamed to @ref glfwGetJoystickAxes.
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The `glfwGetJoystickParam` function and the `GLFW_PRESENT`, `GLFW_AXES` and
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`GLFW_BUTTONS` tokens have been replaced by the @ref glfwJoystickPresent
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function as well as axis and button counts returned by the @ref
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glfwGetJoystickAxes and @ref glfwGetJoystickButtons functions.
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@subsection moving_video_modes Video mode enumeration
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Video mode enumeration is now per-monitor. The @ref glfwGetVideoModes function
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@ -260,6 +279,7 @@ Unix-like systems, where it uses the
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| `glfwGetWindowParam` | @ref glfwGetWindowAttrib | |
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| `glfwGetGLVersion` | @ref glfwGetWindowAttrib | Use `GLFW_OPENGL_VERSION_MAJOR`, `GLFW_OPENGL_VERSION_MINOR` and `GLFW_OPENGL_REVISION` |
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| `glfwGetDesktopMode` | @ref glfwGetVideoMode | Returns the current mode of a monitor |
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| `glfwGetJoystickParam` | @ref glfwJoystickPresent | The axis and button counts are provided by @ref glfwGetJoystickAxes and @ref glfwGetJoystickButtons |
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@subsection moving_renamed_tokens Tokens
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@ -128,4 +128,9 @@ Windowed mode windows can now be created without decorations, i.e. things like
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a frame, a title bar, with the `GLFW_DECORATED` window hint. This allows for
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the creation of things like splash screens.
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@subsection news_30_jsname Joystick names
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The name of a joystick can now be retrieved using @ref glfwGetJoystickName.
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*/
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294
docs/window.dox
294
docs/window.dox
@ -1,31 +1,32 @@
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/*! @page window Window handling
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/*!
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@page window Window handling guide
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@tableofcontents
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The primary purpose of GLFW is to provide a simple interface to window
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management and OpenGL and OpenGL ES context creation. GLFW supports
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multiple windows, which can be either a normal desktop window or
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a fullscreen window.
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management and OpenGL and OpenGL ES context creation. GLFW supports multiple
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windows, which can be either a normal desktop window or a fullscreen window.
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@section window_object Window objects
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@section window_object Window handles
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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 window handle (i.e. window object pointer) is used as a context
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handle as well, for example when calling @ref glfwMakeContextCurrent.
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linked, the object pointer is used as both a context and window handle.
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@section window_hints Window hints
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@section 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.
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Some affect the window itself, others its framebuffer or context. These hints
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are set to their default values each time the library is initialized with @ref
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glfwInit, can be individually set with @ref glfwWindowHint and reset all at once
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to their defaults with @ref glfwDefaultWindowHints.
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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 again that they need to be set *before* the creation of the window you wish
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to have the specified attributes.
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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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@subsection window_hints_hard Hard and soft constraints
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@ -49,6 +50,21 @@ context:
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Hints that do not apply to a given type of window or context are ignored.
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@subsection window_hints_wnd Window related hints
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The `GLFW_RESIZABLE` hint specifies whether the window will be resizable *by the
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user*. The window will still be resizable using the @ref glfwSetWindowSize
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function. This hint is ignored for fullscreen windows.
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The `GLFW_VISIBLE` hint specifies whether the window will be initially
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visible. This hint is ignored for fullscreen windows.
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The `GLFW_DECORATED` hint specifies whether the window will have window
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decorations such as a border, a close widget, etc. This hint is ignored for
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fullscreen windows. Note that even though a window may lack a close widget, it
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is usually still possible for the user to generate close events.
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@subsection window_hints_fb Framebuffer related hints
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The `GLFW_RED_BITS`, `GLFW_GREEN_BITS`, `GLFW_BLUE_BITS`, `GLFW_ALPHA_BITS`,
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@ -116,21 +132,6 @@ used by the context. This can be one of `GLFW_NO_RESET_NOTIFICATION` or
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a robustness strategy.
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@subsection window_hints_wnd Window related hints
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The `GLFW_RESIZABLE` hint specifies whether the window will be resizable *by the
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user*. The window will still be resizable using the @ref glfwSetWindowSize
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function. This hint is ignored for fullscreen windows.
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The `GLFW_VISIBLE` hint specifies whether the window will be initially
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visible. This hint is ignored for fullscreen windows.
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The `GLFW_DECORATED` hint specifies whether the window will have window
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decorations such as a border, a close widget, etc. This hint is ignored for
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fullscreen windows. Note that even though a window may lack a close widget, it
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is usually still possible for the user to generate close events.
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@subsection window_hints_values Supported and default values
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| Name | Default value | Supported values |
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@ -161,20 +162,235 @@ is usually still possible for the user to generate close events.
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| `GLFW_OPENGL_PROFILE` | `GLFW_OPENGL_NO_PROFILE` | `GLFW_OPENGL_NO_PROFILE`, `GLFW_OPENGL_COMPAT_PROFILE` or `GLFW_OPENGL_CORE_PROFILE` |
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@section window_closing Window closing
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@section window_close Window 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 window's close flag is set and then
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its close callback is called. The window is not actually destroyed and, unless
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you are monitoring the close flag, nothing further happens.
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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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If you do not want the close flag to be set, it can be cleared again from the
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close callback (or from any other point in your program) with @ref
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glfwSetWindowShouldClose.
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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, you can set
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the close callback with @ref glfwSetWindowCloseCallback. This callback is
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called directly *after* the close flag has been set.
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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 can be used for example to filter close requests and clear
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the close flag 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, GL_FALSE);
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}
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@endcode
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@section window_dims Window dimensions
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@section window_size Window size
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Text here.
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The size of a window can be changed with @ref glfwSetWindowSize. For windowed
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mode windows, this resizes the specified window so that its *client area* has
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the specified size. Note that the window system may put limitations on size.
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For full screen windows, it selects and sets the video mode most closely
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matching the specified size.
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@code
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void glfwSetWindowSize(window, 640, 480);
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@endcode
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If you wish to be notified when a window is resized, whether by the user or
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the system, you can set the size callback with @ref glfwSetWindowSizeCallback.
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@code
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glfwSetWindowSizeCallback(window, window_size_callback);
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@endcode
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The callback function receives the new size of the client area of the window,
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which can for example be used to update the viewport.
|
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@code
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void window_size_callback(GLFWwindow* window, int width, int height)
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{
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glViewport(0, 0, width, height);
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}
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@endcode
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There is also @ref glfwGetWindowSize for directly retrieving the current size of
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a window.
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@code
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int width, height;
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glfwGetWindowSize(window, &width, &height);
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glViewport(0, 0, width, height);
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@endcode
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@section window_pos Window position
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The position of a windowed-mode window can be changed with @ref
|
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glfwSetWindowPos. This moves the window so that the upper-left corner of its
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client area has the specified screen coordinates. Note that the window system
|
||||
may put limitations on placement.
|
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@code
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glfwSetWindowPos(window, 100, 100);
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@endcode
|
||||
|
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If you wish to be notified when a window is moved, whether by the user or
|
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the system, you can set the position callback with @ref glfwSetWindowPosCallback.
|
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@code
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glfwSetWindowPosCallback(window, window_pos_callback);
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@endcode
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The callback function receives the new position of the upper-left corner of its
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client area.
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@code
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void window_size_callback(GLFWwindow* window, int xpos, int ypos)
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{
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}
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@endcode
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There is also @ref glfwGetWindowPos for directly retrieving the current position
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of the client area of the window.
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||||
@code
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int xpos, ypos;
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glfwGetWindowPos(window, &xpos, &ypos);
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@endcode
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@section window_title Window title
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All GLFW windows have a title, although undecorated or full screen windows may
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not display it or only display it in a task bar or similar interface. To change
|
||||
the title of a window, use @ref glfwSetWindowTitle.
|
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@code
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glfwSetWindowTitle(window, "My Window");
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@endcode
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The window title is a regular C string using the UTF-8 encoding. This means
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for example that, as long as your source file is encoded as UTF-8, you can use
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any Unicode characters.
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@code
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glfwSetWindowTitle(window, "さよなら絶望先生");
|
||||
@endcode
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@section window_attribs Window attributes
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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.
|
||||
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||||
@code
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||||
if (glfwGetWindowAttrib(window, GLFW_FOCUSED))
|
||||
{
|
||||
// window has input focus
|
||||
}
|
||||
@endcode
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@subsection window_attribs_window Window attributes
|
||||
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||||
The `GLFW_FOCUSED` attribute indicates whether the specified window currently
|
||||
has input focus.
|
||||
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||||
The `GLFW_ICONIFIED` attribute indicates whether the specified window is
|
||||
currently 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.
|
||||
|
||||
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.
|
||||
|
||||
The `GLFW_DECORATED` attribute 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.
|
||||
|
||||
|
||||
@subsection window_attribs_context Context 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`.
|
||||
|
||||
The `GLFW_CONTEXT_VERSION_MAJOR`, `GLFW_CONTEXT_VERSION_MINOR` and
|
||||
`GLFW_CONTEXT_REVISION` attributes 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.
|
||||
|
||||
The `GLFW_OPENGL_DEBUG_CONTEXT` attribute 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_NO_PROFILE` if the
|
||||
OpenGL profile is unknown or the context is for another client API.
|
||||
|
||||
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.
|
||||
|
||||
|
||||
@section window_swap Swapping buffers
|
||||
|
||||
GLFW windows are always 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 should wait 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 not all OpenGL implementations properly implement this function, in
|
||||
which case @ref glfwSwapInterval will have no effect. Some drivers also have
|
||||
user settings that override requests by GLFW.
|
||||
|
||||
*/
|
||||
|
||||
@ -1268,7 +1268,7 @@ GLFWAPI void glfwSetWindowTitle(GLFWwindow* window, const char* title);
|
||||
* @param[out] xpos The x-coordinate of the upper-left corner of the client area.
|
||||
* @param[out] ypos The y-coordinate of the upper-left corner of the client area.
|
||||
*
|
||||
* @remarks Either or both coordinate parameters may be `NULL`.
|
||||
* @remarks Either or both coordinate arguments may be `NULL`.
|
||||
*
|
||||
* @bug **Mac OS X:** The screen coordinate system is inverted.
|
||||
*
|
||||
@ -1441,47 +1441,10 @@ GLFWAPI GLFWmonitor* glfwGetWindowMonitor(GLFWwindow* window);
|
||||
* attributes, some related to the window and others to its context.
|
||||
*
|
||||
* @param[in] window The window to query.
|
||||
* @param[in] attrib The attribute whose value to return.
|
||||
* @param[in] attrib The [window attribute](@ref window_attribs) whose value to
|
||||
* return.
|
||||
* @return The value of the attribute, or zero if an error occurred.
|
||||
*
|
||||
* @par Window attributes
|
||||
*
|
||||
* The `GLFW_FOCUSED` attribute indicates whether the window is focused.
|
||||
*
|
||||
* The `GLFW_ICONIFIED` attribute indicates whether the window is iconified.
|
||||
*
|
||||
* The `GLFW_VISIBLE` attribute indicates whether the window is visible.
|
||||
*
|
||||
* The `GLFW_RESIZABLE` attribute indicates whether the window is resizable
|
||||
* by the user.
|
||||
*
|
||||
* The `GLFW_DECORATED` attribute indicates whether the window is decorated.
|
||||
*
|
||||
* @par Context 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`.
|
||||
*
|
||||
* The `GLFW_CONTEXT_VERSION_MAJOR`, `GLFW_CONTEXT_VERSION_MINOR` and
|
||||
* `GLFW_CONTEXT_REVISION` attributes 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.
|
||||
*
|
||||
* The `GLFW_OPENGL_DEBUG_CONTEXT` attribute 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_NO_PROFILE` if the
|
||||
* OpenGL profile is unknown or the context is for another client API.
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
* @ingroup window
|
||||
*/
|
||||
GLFWAPI int glfwGetWindowAttrib(GLFWwindow* window, int attrib);
|
||||
@ -2138,9 +2101,9 @@ GLFWAPI void glfwSwapInterval(int interval);
|
||||
/*! @brief Returns whether the specified extension is available.
|
||||
*
|
||||
* This function returns whether the specified
|
||||
* [OpenGL or context creation API extension](@ref glext) is supported by the
|
||||
* current context. For example, on Windows both the OpenGL and WGL extension
|
||||
* strings are checked.
|
||||
* [OpenGL or context creation API extension](@ref context_glext) is supported
|
||||
* by the current context. For example, on Windows both the OpenGL and WGL
|
||||
* extension strings are checked.
|
||||
*
|
||||
* @param[in] extension The ASCII encoded name of the extension.
|
||||
* @return `GL_TRUE` if the extension is available, or `GL_FALSE` otherwise.
|
||||
@ -2160,8 +2123,8 @@ GLFWAPI int glfwExtensionSupported(const char* extension);
|
||||
* context.
|
||||
*
|
||||
* This function returns the address of the specified
|
||||
* [client API or extension function](@ref glext), if it is supported by the
|
||||
* current context.
|
||||
* [client API or extension function](@ref context_glext), if it is supported
|
||||
* by the current context.
|
||||
*
|
||||
* @param[in] procname The ASCII encoded name of the function.
|
||||
* @return The address of the function, or `NULL` if the function is
|
||||
|
||||
Loading…
Reference in New Issue
Block a user