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Article contents:== Outdated egg! This is an egg for CHICKEN 4, the unsupported old release. You're almost certainly looking for [[/eggref/5/sdl-base|the CHICKEN 5 version of this egg]], if it exists. If it does not exist, there may be equivalent functionality provided by another egg; have a look at the [[https://wiki.call-cc.org/chicken-projects/egg-index-5.html|egg index]]. Otherwise, please consider porting this egg to the current version of CHICKEN. [[tags: egg]] == sdl-base The '''sdl-base''' egg is a successor to the [[sdl]] egg (the latter is expected to become deprecated in the future). Note that bindings to [[http://wiki.call-cc.org/eggref/4/sdl2|sdl2]] also exists. [[toc:]] Unlike '''sdl''', '''sdl-base''' has only the binding for the basic SDL library. This allows for a fine-grained control over what gets linked with your program. For bindings to the complementary libraries see their respective eggs: [[sdl-img]] for SDL_Image, [[sdl-mixer]] for SDL_Mixer and [[sdl-ttf]] for SDL_TTF. === Naming conventions The '''sdl-base''' egg uses roughtly the same naming conventions as the '''sdl''' egg and as the [[http://www.nongnu.org/guile-sdl/|guile-sdl]]: {{SDL_}} prefix is replaced with {{sdl-}}, and hyphens are used to separate words instead of camel-case. === Procedures ==== Related to sdl-version {{sdl-version}} is a structure for holding the version of the SDL library. This is a wrapper for [[http://wiki.libsdl.org/moin.cgi/SDL_version|SDL_version]] structure in the C library. SDL_version consists of 3 fields: major version number, minor version number and patch number. You don’t usually need to create new instances of this structure: you obtain the version of SDL program was compiled with or linked with, and then get individual fields or check if the version is not too old with ``sdl-version-at-least``. <procedure>(make-sdl-version pointer)</procedure> Creates a new wrapper over the C’s SDL_version structure. Usually you won’t need to use this function directly. Instead, use {{(sdl-compiled-version)}} and {{(sdl-linked-version)}} to obtain the version information. <procedure>(sdl-version-major sdl-version)</procedure> Evaluates to the major version number for an SDL version in question. <procedure>(sdl-version-minor sdl-version)</procedure> Evaluates to the minor version number for an SDL version in question. <procedure>(sdl-version-patch sdl-version)</procedure> Evaluates to the patch number for an SDL version in question. <procedure>(sdl-version-at-least sdl-version major minor patch)</procedure> Convenient function to check all the three components at once: evaluates to {{#t}} if the version is newer or equal to the version denoted by the {{major}}, {{minor}} and {{patch}} arguments, or to {{#f}} otherwise. This is analogous to the [[http://wiki.libsdl.org/moin.cgi/SDL_VERSION_ATLEAST|SDL_VERSION_ATLEAST]] in the C interface. <procedure>(sdl-compiled-version)</procedure> Returns the {{sdl-version}} structure describing the SDL version number of the SDL library used during the compilation. This is analogous to the [[http://wiki.libsdl.org/moin.cgi/SDL_COMPILEDVERSION|SDL_COMPILEDVERSION]] macro in the C interface. <procedure>(sdl-linked-version)</procedure> Returns the {{sdl-version}} structure describing the SDL version number of the SDL library used the program is linked against. This is analogous to the [[http://wiki.libsdl.org/moin.cgi/SDL_VERSION|SDL_VERSION]] macro in the C interface. ==== Related to sdl-rect {{sdl-rect}} is a structure for describing a rectangle. It is widely used in the SDL library. It has two fields, {{x}} and {{y}}, denoting its position and two fields, {{w}} and {{h}} denoting width and height respectively. All the values are integers and measured in pixels. <procedure>(make-sdl-rect x y w h)</procedure> Creates a new {{sdl-rect}} structure with the values given in the arguments. <procedure>(sdl-rect-buffer sdl-rect)</procedure> ??? TODO <procedure>(sdl-rect? obj)</procedure> Evaluates to {{#t}} if {{obj}} is {{sdl-rect}}, or {{#f}} otherwise. <procedure>(sdl-rect-x sdl-rect)</procedure> Evaluates to the horizontal position of the leftmost part of a given {{sdl-rect}} in pixels. <procedure>(sdl-rect-y sdl-rect)</procedure> Evaluates to the vertical position of the topmost part a given {{sdl-rect}} in pixels. Like in many programming libraries, in SDL the {{y}} axis runs from top to bottom. <procedure>(sdl-rect-w sdl-rect)</procedure> Evaluates to the width of a given {{sdl-rect}} in pixels. <procedure>(sdl-rect-h sdl-rect)</procedure> Evaluates to the height of a given {{sdl-rect}} in pixels. ==== Related to sdl-pixel-format The {{sdl-pixel-format}} structure describes the way pixels are stored in the surface. It is a wrapper for the [[http://wiki.libsdl.org/moin.cgi/SDL_PixelFormat|SDL_PixelFormat]] structure in SDL’s C interface. Currently the {{sdl}} egg exposes no function to work with the SDL_Palette structure. <procedure>(make-sdl-pixel-format pointer)</procedure> Creates a new wrapper over the C’s {{SDL_PixelFormat}} structure. Usually you won’t need to use this function directly. <procedure>(sdl-pixel-format? obj)</procedure> Evaluates to {{#t}} if {{obj}} is {{sdl-pixel-format}}, or to {{#f}} otherwise. <procedure>(sdl-pixel-format-bytes-per-pixel sdl-rect)</procedure> Evaluates to the number of bytes used to store one pixel in a given {{sdl-pixel-format}}. The result is always an integer value. <procedure>(sdl-pixel-format-rmask sdl-rect)</procedure> Evaluates to the ''red mask'', 32-bit integer number describing the way red-colour component is stored in a given {{sdl-pixel-format}}. The result is always an integer value. The red mask is an integer value in which the bits set to 1 represent bits used to store the red value. Red mask is not used for 8-bit (1-byte) pixel formats. <procedure>(sdl-pixel-format-gmask sdl-rect)</procedure> Evaluates to the ''green mask'', 32-bit integer value. Green mask is not used for 8-bit (1-byte) pixel formats. <procedure>(sdl-pixel-format-bmask sdl-rect)</procedure> Evaluates to the ''blue mask'', 32-bit integer value. Blue mask is not used for 8-bit (1-byte) pixel formats. <procedure>(sdl-pixel-format-amask sdl-rect)</procedure> Evaluates to the ''alpha mask'', 32-bit integer value. Alpha mask is not used for 8-bit (1-byte) pixel formats. ==== Related to sdl-surface The {{sdl_surface}} structure represents the object used to store image data. It is characterised by width ({{w}}), height ({{h}}), pixel format ({{pixel-format}}), {{flags}} describing additional information, the actual pixel values ({{pixels}}) and some other information. It is a wrapper over [[http://wiki.libsdl.org/moin.cgi/SDL_Surface|SDL_Surface]] structure in SDL’s C interface. Unlike most other objects, surfaces '''must be explicitly disposed of after using''' with the {{sdl-free-surface}} function. <procedure>(make-sdl-surface pointer)</procedure> Creates a new wrapper over the C’s {{SDL_PixelFormat}} structure. Usually you won’t need to use this function directly, its main purpose is interoperability with foreign C code. To create new empty surfaces, use the {{sdl-create-rgb-surface}} function. To create surface from files, use <procedure>(sdl-surface? obj)</procedure> Evaluates to {{#t}} if {{obj}} is {{sdl-surface}}, or to {{#f}} otherwise. <procedure>(sdl-create-rgb-surface flags width height depth rmask gmask bmask amask)</procedure> Creates a RGB(A) surface with the given height, width, rmask, gmask, bmask and amask. This is a wrapper for [[http://wiki.libsdl.org/moin.cgi/SDL_CreateRGBSurface|SDL_CreateRGBSurface]] function. Flags can be: {{SDL_SWSURFACE}} (store surface in general-purpose memory) or {{SDL_HWSURFACE}} (store surface in video memory), {{SDL_SRCCOLORKEY}} (turn on colour-keying; use {{sdl-set-color-key!}} to change the value of this flag after surface creation), {{SDL_SRCALPHA}} (use alpha-channel for surface; this flag is automatically set if {{amask}} is non-zero; {{sdl-set-alpha!}} allows to change this flag later). Flags can be combined with {{+}}. <procedure>(sdl-surface-flags sdl-surface)</procedure> Evaluates to flags describing the given surface. <procedure>(sdl-surface-pixel-format sdl-surface)</procedure> Evaluates to pixel format describing the given surface. <procedure>(sdl-surface-width sdl-surface)</procedure> Evaluates to the width of a given surface. <procedure>(sdl-surface-height sdl-surface)</procedure> Evaluates to the height of a given surface. <procedure>(sdl-surface-pitch sdl-surface)</procedure> Evaluates to the actual number of bytes describing each row of a given surface. <procedure>(sdl-surface-pixels sdl-surface)</procedure> Evaluates to the pixel data (TODO: ??? how is it mapped to Scheme objects???) a given surface. <procedure>(sdl-surface-pixels-length sdl-surface)</procedure> Evaluates to the size of pixel data in bytes. <procedure>(sdl-free-surface sdl-surface)</procedure> Disposes of the unused surface. Surface should not be used after calling this function. Failing to call this function on used surfaces may result in memory leaks. ==== Related to sdl-video-info {{sdl-video-info}} is a read-only structure that contains information on the video mode. It is returned by {{sdl-get-video-info}} and cointains information either on the best available video mode (if called before {{sdl-set-video-mode}}) or on the current video mode. <procedure>(make-sdl-video-info pointer)</procedure> Creates a new Scheme structure from the C’s structure. This function is usually not neccessary in Scheme programs: just use {{sdl-get-video-mode}} directly instead of calling it from C code. <procedure>(sdl-video-info-pointer)</procedure> ???? TODO <procedure>(sdl-get-video-info)</procedure> Returns a {{sdl-video-info}} structure describing either the 'best' video mode (if called before {{sdl-set-video-mode}}) or the current video mode. <procedure>(sdl-video-info-hw-available sdl-video-info)</procedure> Evaluates to {{1}} if it is possible to create hardware-accelerated surfaces according to the data in the {{sdl-video-info}}, to {{0}} otherwise. <procedure>(sdl-video-info-wm-available sdl-video-info)</procedure> Evaluates to {{1}} if the window manager is available according to the data in the {{sdl-video-info}}, to {{0}} otherwise. <procedure>(sdl-video-info-blit-hw sdl-video-info)</procedure> Evaluates to {{1} if blits from hardware memory to hardware memory are hardware-accelerated, according to the data in the {{sdl-video-info}}, {{0}} otherwise. <procedure>(sdl-video-info-blit-hw-cc sdl-video-info)</procedure> Evaluates to {{1}} its from hardware memory to hardware memory with colour key are hardware-accelerated, according to the data in the {{sdl-video-info}}, {{0}} otherwise. <procedure>(sdl-video-info-blit-hw-a sdl-video-info)</procedure> Evaluates to {{1}} its from hardware memory to hardware memory with alpha channel are hardware-accelerated, according to the data in the {{sdl-video-info}}, to {{0}} otherwise. <procedure>(sdl-video-info-blit-sw sdl-video-info)</procedure> Evaluates to {{1}} if blits from software memory to hardware memory are hardware-accelerated, according to the data in the {{sdl-video-info}}, {{0}} otherwise. <procedure>(sdl-video-info-blit-sw-cc sdl-video-info)</procedure> Evaluates to {{1}} if blits from software memory to hardware memory with colour key are hardware-accelerated, according to the data in the {{sdl-video-info}}, {{0}} otherwise. <procedure>(sdl-video-info-blit-sw-a sdl-video-info)</procedure> Evaluates to {{1}} if blits from software memory to hardware memory with alpha channel are hardware-accelerated, according to the data in the {{sdl-video-info}}, {{0}} otherwise. <procedure>(sdl-video-info-blit-fill sdl-video-info)</procedure> Evaluates to {{1}} if colour fills are hardware-accelerated, according to the data in the {{sdl-video-info}}, or to {{0}} otherwise. <procedure>(sdl-video-info-video-mem sdl-video-info)</procedure> Evaluates to an integer representing the total amount of video memory in kilobytes, according to {{sdl-video-info}}. <procedure>(sdl-video-info-vfmt sdl-video-info)</procedure> Evaluates to {{sdl-pixel-format}} structure describing the pixel format of the video mode described by {{sdl-video-info}}. <procedure>(sdl-video-info-current-w sdl-video-info)</procedure> Evaluates to the width, in pixels, of the video mode described by {{sdl-video-info}}. <procedure>(sdl-video-info-current-h sdl-video-info)</procedure> Evaluates to the height, in pixels, of the video mode described by {{sdl-video-info}}. ==== Related to sdl-color {{sdl-color}} structure describes a colour in a format-independent way. It has 3 fields, {{r}}, {{g}} and {{b}} describing the red, green and blue components of colour according to the RGB model respectively. Corresponds to {{SDL_Color}} structure in C API. <procedure>(make-sdl-color r g b)</procedure> Accepts the reg, green and blue components of colour respectively and return a new {{sdl-color}} value. <procedure>(sdl-color-buffer sdl-color)</procedure> ??? TODO <procedure>(sdl-color? obj)</procedure> Evaluates to {{#t}} if {{obj}} is of type {{sdl-color}}, or to {{#f}} otherwise. <procedure>(sdl-color-r sdl-color)</procedure> Returns the red component of the colour denoted by its argument. <procedure>(sdl-color-g sdl-color)</procedure> Returns the green component of the colour denoted by its argument. <procedure>(sdl-color-b sdl-color)</procedure> Returns the blue component of the colour denoted by its argument. ==== Related to sdl-event (TODO) {{sdl-event}} is a structure describing the events that occur in an SDL program. These can be of different types, and different fields are applicable for different types. To get the type of event, use {{sdl-event-type}} procedure. This structure corresponds to {{SDL_Event}} in C API. <procedure>(make-sdl-event)</procedure> Returns a new {{sdl-event}} structure. <procedure>(sdl-event-buffer sdl-event-buffer-set! ...)</procedure> TODO ???? <procedure>(sdl-event-type sdl-event)</procedure> Returns an integer number denoting the type of event. This number will be equal to one of the following constants: * {{SDL_ACTIVEEVENT}} (activation event; occurs when application has gained or recieved focus; {{gain}} and {{state}} fields are applicable), * {{SDL_KEYDOWN}} and {{SDL_KEYUP}} (keypress event; occurs when a key has been pressed or released; {{state}}, {{sym}}, {{mod}}, {{scancode}} and {{unicode}} fields are available), * {{SDL_MOUSEMOTION}}, {{SDL_MOUSEBUTTONDOWN}} and {{SDL_MOUSEBUTTONUP}} (occurs when mouse is moved or mouse button in clicked or released; {{state}}, {{x}}, {{y}}, {{xrel}} and {{yrel}} fields are available), * {{SDL_JOYAXISMOTION}}, * {{SDL_JOYBALLMOTION}}, * {{SDL_JOYHATMOTION}}, * {{SDL_JOYBUTTONDOWN}} and {{SDL_JOYBUTTONUP}}, * {{SDL_QUIT}}, * {{SDL_SYSWMEVENT}}, * {{SDL_VIDEORESIZE}}, * {{SDL_VIDEOEXPOSE}}, * {{SDL_USEREVENT}} or higher. <procedure>(sdl-event? ...)</procedure> <procedure>(sdl-event-gain ...)</procedure> <procedure>(set-sdl-event-gain! ...)</procedure> <procedure>(sdl-event-which ...)</procedure> <procedure>(set-sdl-event-which! ...)</procedure> <procedure>(sdl-event-state ...)</procedure> <procedure>(set-sdl-event-state! ...)</procedure> <procedure>(sdl-event-scancode ...)</procedure> <procedure>(set-sdl-event-scancode! ...)</procedure> <procedure>(sdl-event-sym ...)</procedure> <procedure>(set-sdl-event-sym! ...)</procedure> <procedure>(sdl-event-mod ...)</procedure> <procedure>(set-sdl-event-mod! ...)</procedure> <procedure>(sdl-event-unicode ...)</procedure> <procedure>(set-sdl-event-unicode! ...)</procedure> <procedure>(sdl-event-x ...)</procedure> <procedure>(set-sdl-event-x! ...)</procedure> <procedure>(sdl-event-y ...)</procedure> <procedure>(set-sdl-event-y! ...)</procedure> <procedure>(sdl-event-xrel ...)</procedure> <procedure>(set-sdl-event-xrel! ...)</procedure> <procedure>(sdl-event-yrel ...)</procedure> <procedure>(set-sdl-event-yrel! ...)</procedure> <procedure>(sdl-event-axis ...)</procedure> <procedure>(set-sdl-event-axis! ...)</procedure> <procedure>(sdl-event-ball ...)</procedure> <procedure>(set-sdl-event-ball! ...)</procedure> <procedure>(sdl-event-hat ...)</procedure> <procedure>(set-sdl-event-hat! ...)</procedure> <procedure>(sdl-event-value ...)</procedure> <procedure>(set-sdl-event-value! ...)</procedure> <procedure>(sdl-event-button ...)</procedure> <procedure>(set-sdl-event-button! ...)</procedure> <procedure>(sdl-event-w ...)</procedure> <procedure>(set-sdl-event-w! ...)</procedure> <procedure>(sdl-event-h ...)</procedure> <procedure>(set-sdl-event-h! ...)</procedure> ==== TODO: undocumented functions <procedure>(sdl-get-clip-rect! sdl-surface sdl-rect)</procedure> Retrieves the clipping rectangle for the surface ({{sdl-surface}}) and saves it into the object {{sdl-rect}}. When something is blitted on the surface, the area outside the blitting rectangle is ignored. <procedure>(sdl-set-clip-rect! sdl-surface sdl-rect)</procedure> Sets the clipping rectangle ({{sdl-rect}}) for the surface ({{sdl-surface}}). When something is blitted on the surface, the area outside the blitting rectangle is ignored. If the clipping rectangle is larger than surface, it is cropped to surface size. If area is NULL (TODO: how to pass null rect in Scheme?), the clipping rectangle is set to the surface size. <procedure>(sdl-set-color-key! sdl-surface flags key)</procedure> Sets the colour key for the given {{sdl-surface) and/or turns its RLE acceleration settings on or off. {{flags}} is an integer that can be {{SDL_SRCCOLORKEY}} (if set, {{key}} is the new colour key), {{SDL_RLEACCEL}} (if set, surface will be stored with RLE acceleration), or a sum of both. {{key}} is an integer value representing the colour that will be considered transparent when drawing (you can obtain this value via {{sdl-map-rgb}}). <procedure>(sdl-set-alpha! ...)</procedure> TODO <procedure>(sdl-display-format sdl-surface)</procedure> Creates a new surface with the same format as the display format and width and height same as {{sdl-surface}} and copies {{sdl-surface}}'s content into the new surface. If colour key or alpha value are needed, they should be set before calling this procedure. If alpha channel is needed, {{sdl-display-format-alpha}} should be used. <procedure>(sdl-display-format-alpha sdl-display-format-alpha)</procedure> Creates a new surface with the same format as the display format, with alpha channel, and with width and height same as {{sdl-surface}}, and then copies {{sdl-surface}}'s content into the new surface. If colour key or alpha value are needed, they should be set before calling this procedure. If colour key is set, it will be converted into alpha channel. <procedure>(sdl-convert-surface sdl-surface pixel-format flags)</procedure> Creates a new the surface with the pixel format given ({{pixel-format}}) and copies contents of {{sdl-surface}} into it. Flags are the same as for the sdl-create-rgb-surface procedure: {{SDL_SWSURFACE}}, {{SDL_HWSURFACE}} (surface resides in software or hardware memory respectively), {{SDL_SRCCOLORKEY}} (surface has colour key), {{SDL_SRCALPHA}} (surface has alpha-channel transparency); flags can be combined with {{+}}. <procedure>(sdl-init ...)</procedure> <procedure>(sdl-init-sub-system ...)</procedure> <procedure>(sdl-quit-sub-system ...)</procedure> <procedure>(sdl-quit ...)</procedure> <procedure>(sdl-was-init ...)</procedure> <procedure>(sdl-get-error ...)</procedure> <procedure>(sdl-clear-error! ...)</procedure> <procedure>(sdl-wm-set-caption title icon)</procedure> Sets the title and icon caption of the window to the strings passed as its arguments. (TODO: what exactly is icon caption???) <procedure>(sdl-wm-get-caption-title)</procedure> Evaluates to the string representing the current title caption of a window. <procedure>(sdl-wm-get-caption-icon)</procedure> Evaluates to the string representing the current icon caption of a window. <procedure>(sdl-wm-get-caption)</procedure> Returns two string values: the current title and icon caption of a window. <procedure>(sdl-wm-set-icon icon mask)</procedure> TODO <procedure>(sdl-wm-iconify-window ...)</procedure> <procedure>(sdl-wm-toggle-full-screen ...)</procedure> <procedure>(sdl-wm-grab-input ...)</procedure> <procedure>(sdl-get-ticks ...)</procedure> <procedure>(sdl-delay ...)</procedure> <procedure>(timer? ...)</procedure> This is a type predicate for timers. Since there's no way ATM for you to get a reference to a timer, this will always return #f. <procedure>(get-time-of-day ...)</procedure> <procedure>(get-time-of-day ...)</procedure> <procedure>(sdl-add-relative-timer! time callback)</procedure> Register {{callback}} to be called {{time}} seconds in the future. The callback will be called as a side effect of {{sdl-wait-event!*}}, so if you don't use {{sdl-wait-event!*}} or {{sdl-wait-event!}} (e.g. because you use {{sdl-poll-event!}} instead) your callbacks will never be invoked. This doesn't use the SDL timer functionality, so the C {{SDL_*Timer}} documentation doesn't apply. In particular, you shouldn't worry about threading issues. <procedure>(sdl-pump-events ...)</procedure> <procedure>(sdl-poll-event! ...)</procedure> <procedure>(sdl-wait-event!* delay-function [sdl-event])</procedure> Wait for a new SDL Event. {{delay-function}} is expected to take a single number and sleep that many milliseconds (call {{sdl-wait-event!}} instead if you're unsure what to use). If {{sdl-event}} is provided, it will be populated with the event data. Note that {{sdl-event}} blocks other srfi-18 threads. You can use {{(lambda (ms) (thread-sleep! (/ ms 1000)))}} as the delay-function for sdl-event processing in a separate srfi-18 thread. <procedure>(sdl-wait-event! [sdl-event])</procedure> Same as {{(sdl-wait-event!* sdl-delay [sdl-event])}}. <procedure>(sdl-push-event ...)</procedure> <procedure>(sdl-event-state! ...)</procedure> <procedure>(sdl-get-mouse-state ...)</procedure> <procedure>(sdl-warp-mouse ...)</procedure> <procedure>(sdl-enable-unicode ...)</procedure> <procedure>(sdl-get-video-surface ...)</procedure> <procedure>(sdl-video-driver-name ...)</procedure> <procedure>(sdl-set-video-mode ...)</procedure> <procedure>(sdl-video-mode-ok ...)</procedure> <procedure>(sdl-show-cursor ...)</procedure> <procedure>(sdl-map-rgb sdl-pixel-format r g b)</procedure> Returns a 32-bit integer representing the colour with the corresponding values of red ({{r}}), green ({{g}}) and blue ({{b}}) components according to the given {{sdl-pixel-format}}. Arguments {{r}}, {{g}} and {{b}} must be integers from 0 to 255 (#xFF). If the colour cannot be represented, the closest match is returned. If the surface supports transparency, fully opaque colour is returned. <procedure>(sdl-map-rgba sdl-pixel-format r g b a)</procedure> Returns a 32-bit integer representing the colour with the corresponding values of red ({{r}}), green ({{g}}), blue ({{b}}) and alpha ({{a}}) components according to the given {{sdl-pixel-format}}. Arguments {{r}}, {{g}}, {{b}} and {{a}} must be integers from 0 to 255 (#xFF). If the colour cannot be represented, the closest match is returned. If the surface doesn't support transparency, {{a}} is ignored (it's the same as #xFF). <procedure>(sdl-fill-rect ...)</procedure> <procedure>(sdl-flip ...)</procedure> <procedure>(sdl-free-surface ...)</procedure> <procedure>(sdl-blit-surface ...)</procedure> <procedure>(sdl-with-clip-rect ...)</procedure> <procedure>(make-sdl-joystick ...)</procedure> <procedure>(sdl-joystick-pointer ...)</procedure> <procedure>(sdl-joystick? ...)</procedure> <procedure>(sdl-joystick-event-state ...)</procedure> <procedure>(sdl-joystick-update ...)</procedure> <procedure>(sdl-num-joysticks ...)</procedure> <procedure>(sdl-joystick-name ...)</procedure> <procedure>(sdl-joystick-open ...)</procedure> <procedure>(sdl-joystick-opened ...)</procedure> <procedure>(sdl-joystick-index ...)</procedure> <procedure>(sdl-joystick-num-axes ...)</procedure> <procedure>(sdl-joystick-num-balls ...)</procedure> <procedure>(sdl-joystick-num-hats ...)</procedure> <procedure>(sdl-joystick-num-buttons ...)</procedure> <procedure>(sdl-joystick-update ...)</procedure> <procedure>(sdl-joystick-get-axis ...)</procedure> <procedure>(sdl-joystick-get-hat ...)</procedure> <procedure>(sdl-joystick-get-button ...)</procedure> <procedure>(sdl-joystick-close ...)</procedure> <procedure>(sdl-gl-swap-buffers ...)</procedure> <procedure>(sdl-gl-set-attribute ...)</procedure> <procedure>(sdl-gl-get-attribute ...)</procedure> <procedure>(heap? ...)</procedure> === Links * SDL homepage: [[http://www.libsdl.org/]] * SDL documentation: [[http://www.libsdl.org/intro.en/toc.html]] Description of your changes:

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