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Simple DirectMedia Layer

CI TagBot Coverage Status pkgeval version deps Genie Downloads

Bindings for the Simple DirectMedia Layer library. The bindings were generated using Clang.jl. Documentation can be found on the SDL wiki.

Installation

pkg> add SimpleDirectMediaLayer

For Linux users, you probably need to manually config the environment variable ALSA_CONFIG_PATH. If the path is empty, the default value /usr/share/alsa/alsa.conf will be used. Please refer to JuliaPackaging/Yggdrasil#1432 for more details.

Quick start

using SimpleDirectMediaLayer
using SimpleDirectMediaLayer.LibSDL2

SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 16)
SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, 16)

@assert SDL_Init(SDL_INIT_EVERYTHING) == 0 "error initializing SDL: $(unsafe_string(SDL_GetError()))"

win = SDL_CreateWindow("Game", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1000, 1000, SDL_WINDOW_SHOWN)
SDL_SetWindowResizable(win, SDL_TRUE)

renderer = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC)

surface = IMG_Load(joinpath(dirname(pathof(SimpleDirectMediaLayer)), "..", "assets", "cat.png"))
tex = SDL_CreateTextureFromSurface(renderer, surface)
SDL_FreeSurface(surface)

w_ref, h_ref = Ref{Cint}(0), Ref{Cint}(0)
SDL_QueryTexture(tex, C_NULL, C_NULL, w_ref, h_ref)

try
    w, h = w_ref[], h_ref[]
    x = (1000 - w) ÷ 2
    y = (1000 - h) ÷ 2
    dest_ref = Ref(SDL_Rect(x, y, w, h))
    close = false
    speed = 300
    while !close
        event_ref = Ref{SDL_Event}()
        while Bool(SDL_PollEvent(event_ref))
            evt = event_ref[]
            evt_ty = evt.type
            if evt_ty == SDL_QUIT
                close = true
                break
            elseif evt_ty == SDL_KEYDOWN
                scan_code = evt.key.keysym.scancode
                if scan_code == SDL_SCANCODE_W || scan_code == SDL_SCANCODE_UP
                    y -= speed / 30
                    break
                elseif scan_code == SDL_SCANCODE_A || scan_code == SDL_SCANCODE_LEFT
                    x -= speed / 30
                    break
                elseif scan_code == SDL_SCANCODE_S || scan_code == SDL_SCANCODE_DOWN
                    y += speed / 30
                    break
                elseif scan_code == SDL_SCANCODE_D || scan_code == SDL_SCANCODE_RIGHT
                    x += speed / 30
                    break
                else
                    break
                end
            end
        end

        x + w > 1000 && (x = 1000 - w;)
        x < 0 && (x = 0;)
        y + h > 1000 && (y = 1000 - h;)
        y < 0 && (y = 0;)

        dest_ref[] = SDL_Rect(x, y, w, h)
        SDL_RenderClear(renderer)
        SDL_RenderCopy(renderer, tex, C_NULL, dest_ref)
        dest = dest_ref[]
        x, y, w, h = dest.x, dest.y, dest.w, dest.h
        SDL_RenderPresent(renderer)

        SDL_Delay(1000 ÷ 60)
    end
finally
    SDL_DestroyTexture(tex)
    SDL_DestroyRenderer(renderer)
    SDL_DestroyWindow(win)
    SDL_Quit()
end