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# schemelib
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SchemeLib is my own swiss knife when coding with scheme, it helps code reuse across my projects.
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Code is tailored to my needs, so from an external point of view it's probably the worst imaginable standard library imaginable (just after the one of PHP 4 and less).
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Of course, there is no documentation.
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(define (g-main-loop-new context is-running)
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((foreign-procedure "g_main_loop_new" (void* boolean) void*) context is-running))
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(define (g-main-loop-run loop)
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((foreign-procedure "g_main_loop_run" (void*) void) loop))
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(define (g-main-loop-quit loop)
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((foreign-procedure "g_main_loop_quit" (void*) void) loop))
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(load-shared-object "libglib-2.0.so"))
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(load-shared-object "libgobject-2.0.so"))
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(define (g-object-set object property value)
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((foreign-procedure "g_object_set" (void* string string void*) void) object property value 0))
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(define (g-signal-connect-data instance detailed-signal handler data destroy-data connect-flag)
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((foreign-procedure "g_signal_connect_data" (void* string void* void* void* int) void)
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instance detailed-signal handler data destroy-data connect-flag))
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(define (g-signal-connect instance detailed-signal handler data)
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(g-signal-connect-data instance detailed-signal handler data 0 0))
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(define (g-object-unref object)
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((foreign-procedure "g_object_unref" (void*) void) object))
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(load-shared-object "libgstreamer-1.0.so.0"))
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; Data structures
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(define (gst-message->symbol int)
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(case int
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((1) 'eos)
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((2) 'error)))
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(define (gst-state->int symbol)
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(case symbol
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((void-pending) 0)
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((null) 1)
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((ready) 2)
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((paused) 3)
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((playing) 4)))
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(define-ftype gst-mini-object
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(struct
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[type unsigned-long]
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[refcount int]
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[lockstate int]
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[flags unsigned-int]
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[copy void*]
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[dispose void*]
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[free void*]
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[n-qdata unsigned-int]
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[qdata void*]))
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(define-ftype gst-message
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(struct
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[mini-object gst-mini-object]
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[type int]
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[timestamp unsigned-64]
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[src void*]
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[seqnum unsigned-32]
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[lock void*]
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[cond void*]))
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(define (gst-init argc argv)
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((foreign-procedure "gst_init" (ptr void*) void) argc argv))
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(define (gst-element-factory-make factory-name name)
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((foreign-procedure "gst_element_factory_make" (string string) void*) factory-name name))
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(define (gst-pipeline-get-bus pipeline)
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((foreign-procedure "gst_pipeline_get_bus" (void*) void*) pipeline))
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(define (gst-bus-add-watch bus func user-data)
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((foreign-procedure "gst_bus_add_watch" (void* void* void*) int) bus func user-data))
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(define (gst-bus-add-signal-watch bus)
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((foreign-procedure "gst_bus_add_signal_watch" (void*) void) bus))
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(define (gst-object-unref object)
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((foreign-procedure "gst_object_unref" (void*) void) object))
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(define (gst-element-set-state element state)
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((foreign-procedure "gst_element_set_state" (void* int) int) element state))
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(define (gst-filename-to-uri filename err)
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((foreign-procedure "gst_filename_to_uri" (string void*) string) filename err))
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(load-shared-object "libgtk-3.so.0"))
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(define (gtk-init argc argv)
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((foreign-procedure "gtk_init" (ptr void*) void) argc argv))
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(define (gtk-builder-new)
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((foreign-procedure "gtk_builder_new" () void*)))
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(define (gtk-builder-add-from-file builder filename err)
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((foreign-procedure "gtk_builder_add_from_file" (void* string void*) void) builder filename err))
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(define (gtk-builder-get-object builder name)
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((foreign-procedure "gtk_builder_get_object" (void* string) void*) builder name))
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(define (gtk-builder-connect-signals builder user-data)
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((foreign-procedure "gtk_builder_connect_signals" (void* void*) void) builder user-data))
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(define (gtk-builder-add-callback-symbol builder cb-name cb-symbol)
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((foreign-procedure "gtk_builder_add_callback_symbol" (void* string void*) void) builder cb-name cb-symbol))
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(define (gtk-widget-show widget)
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((foreign-procedure "gtk_widget_show" (void*) void) widget))
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(define (gtk-widget-set-visible widget visibility)
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((foreign-procedure "gtk_widget_set_visible" (void* boolean) void) widget visibility))
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(define (gtk-main)
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((foreign-procedure "gtk_main" () void)))
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(define (gtk-main-quit)
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((foreign-procedure "gtk_main_quit" () void)))
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(load-shared-object "/usr/lib64/libSDL2-2.0.so.0")
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(load-shared-object "/usr/lib64/libSDL2_image-2.0.so.0")
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; A quick example:
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; https://stackoverflow.com/questions/20579658/how-to-draw-pixels-in-sdl-2-0
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;
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; Header files to write bindings:
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; https://github.com/SDL-mirror/SDL/tree/master/include
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; https://github.com/SDL-mirror/SDL_image/blob/master/SDL_image.h
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;--- binding utils
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(define (check-err out)
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(assert (= 0 out)))
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;--- SDL.h
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(define (SDL_INIT-flag->int flag)
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(case flag
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((VIDEO) #x00000020)
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))
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(define (SDL_Init flag)
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(check-err ((foreign-procedure "SDL_Init" (unsigned-32) int) (SDL_INIT-flag->int flag))))
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(define (SDL_Quit)
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((foreign-procedure "SDL_Quit" () void)))
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;--- SDL_video.h
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(define (SDL_WINDOW-flag->int flag)
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(case flag
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((SHOW) #x00000004)
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((FOREIGN) #x00000800)
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((HIDDEN) #x00000008)
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))
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(define (SDL_CreateWindow name x y w h flags)
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(let*
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[(fx (foreign-procedure
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"SDL_CreateWindow"
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(string int int int int unsigned-32)
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void*))
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(win (fx name x y w h (SDL_WINDOW-flag->int flags)))]
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(assert (> win 0))
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win))
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(define (SDL_SetWindowSize win w h)
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((foreign-procedure
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"SDL_SetWindowSize"
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(void* int int)
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void) win w h))
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(define (SDL_DestroyWindow window)
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((foreign-procedure
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"SDL_DestroyWindow"
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(void*)
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void) window))
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;--- SDL_render.h
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(define-ftype
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[SdlRect
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(struct
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(x int) (y int)
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(w int) (h int)
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)])
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(define (SDL_Rect x y w h)
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(let [
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(rect
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(make-ftype-pointer
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SdlRect
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(foreign-alloc (ftype-sizeof SdlRect))))]
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(ftype-set! SdlRect (x) rect x)
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(ftype-set! SdlRect (y) rect y)
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(ftype-set! SdlRect (w) rect w)
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(ftype-set! SdlRect (h) rect h)
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rect
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))
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(define (SDL_RenderSetLogicalSize rend w h)
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(check-err
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((foreign-procedure
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"SDL_RenderSetLogicalSize"
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(void* int int)
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int) rend w h)))
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(define (SDL_RenderSetScale rend scaleX scaleY)
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(check-err
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((foreign-procedure
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"SDL_RenderSetScale"
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(void* float float)
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int) rend scaleX scaleY)))
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(define (SDL_RENDERER-flag->int flag)
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(case flag
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((SOFTWARE) #x00000001)
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((ACCELERATED) #x00000002)
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))
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(define (SDL_CreateRenderer window index flags)
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(let*
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[(fx (foreign-procedure
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"SDL_CreateRenderer"
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(void* int unsigned-32)
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void*))
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(rend (fx window index (SDL_RENDERER-flag->int flags)))]
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(assert (> rend 0))
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rend))
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(define (SDL_RenderReadPixels rend rect format pix pitch)
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(check-err
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((foreign-procedure
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"SDL_RenderReadPixels"
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(void* (* SdlRect) unsigned-32 void* int)
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int) rend rect format pix pitch)))
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(define (SDL_SetRenderDrawColor rend r g b a)
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(check-err
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((foreign-procedure
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"SDL_SetRenderDrawColor"
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(void* unsigned-8 unsigned-8 unsigned-8 unsigned-8)
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int) rend r g b a)))
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(define (SDL_RenderGetViewport rend rect)
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((foreign-procedure
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"SDL_RenderGetViewport"
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(void* (* SdlRect))
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void) rend rect))
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(define (SDL_RenderClear rend)
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(check-err
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((foreign-procedure
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"SDL_RenderClear"
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(void*)
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int) rend)))
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(define (SDL_RenderDrawPoint rend x y)
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(check-err
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((foreign-procedure
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"SDL_RenderDrawPoint"
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(void* int int)
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int) rend x y)))
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(define (SDL_RenderPresent rend)
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((foreign-procedure
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"SDL_RenderPresent"
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(void*)
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void) rend))
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(define (SDL_DestroyRenderer rend)
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((foreign-procedure
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"SDL_DestroyRenderer"
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(void*)
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void) rend))
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;--- SDL_surface.h
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(define-ftype
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[SdlPixelFormat
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(struct
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(format unsigned-32)
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;-- not safe to allocate, missing fields
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)]
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[SdlSurface
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(struct
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(flags unsigned-32)
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(format (* SdlPixelFormat))
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(w int)
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(h int)
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(pitch int)
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(pixels void*)
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;-- not safe to allocate, missing fields
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)])
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(define (SDL_CreateRGBSurface flags w h depth Rm Gm Bm Am)
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((foreign-procedure
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"SDL_CreateRGBSurface"
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(unsigned-32 int int int unsigned-32 unsigned-32 unsigned-32 unsigned-32)
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(* SdlSurface)) flags w h depth Rm Gm Bm Am))
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; inspired by https://stackoverflow.com/a/20070273
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(define (SDLb_SetPixel surface x y r g b a)
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(map
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(lambda (e)
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(let [(color (car e)) (intensity (cadr e))]
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(foreign-set!
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'unsigned-8
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(ftype-ref SdlSurface (pixels) surface)
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(+
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(* y (ftype-ref SdlSurface (pitch) surface))
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(* x (ftype-sizeof unsigned-32))
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color)
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intensity
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)))
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`((0 ,b) (1 ,g) (2 ,r) (3 ,a))
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))
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;--- SDL_events.h
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(define-ftype
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[SdlEvent
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(union
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(type unsigned-32)
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(padding (array 56 unsigned-8)))]
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)
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(define (SDL_Event)
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(make-ftype-pointer
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SdlEvent
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(foreign-alloc (ftype-sizeof SdlEvent))))
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(define (SDL_PollEvent event)
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((foreign-procedure
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"SDL_PollEvent"
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((* SdlEvent))
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int) event))
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(define (SDL_EVENT-int->flag i)
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(case i
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((#x100) 'QUIT)
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))
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;--- SDL_image.h
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(define (IMG_SavePNG surface file)
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(check-err
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((foreign-procedure
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"IMG_SavePNG"
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((* SdlSurface) string)
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int) surface file)))
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