The padding is implemented by adding CSS styles
.paddingLeft/Right/Top/Bottom on the canvas.
you can try querying them e.g. with
double paddingLeft = EM_ASM_DOUBLE(return
parseFloat(document.querySelector('canvas').style.paddingLeft));
those values will be in CSS pixel units, so scale with
window.devicePixelRatio if you are computing in WebGL native pixel units.
ti 19. toukok. 2020 klo 15.56 Scott Newby ([email protected]) kirjoitti:
> Hello
>
> I've hit a problem with my game and fullscreen on browsers and mobiles.
> I'm using SDL and sdl-gpu and everything works fine in the browser normally
> but when I go soft fullscreen using...
>
> EMSCRIPTEN_FULLSCREEN_SCALE_ASPECT
> EMSCRIPTEN_FULLSCREEN_CANVAS_SCALE_NONE
> EMSCRIPTEN_FULLSCREEN_FILTERING_DEFAULT
>
> It looks ok but mouse coords are all off. My game has a virtual
> resolution of 768x1024, I create my SDL window at 50% of that and sdl-gpu
> will scale coordinates to fit. I've output the html5.h callback for
> mousemove and I can see the coords look correct normally - if I move the
> mouse to the top left of the canvas I get 0,0. If I move off the canvas to
> the left I get -100,0, etc. This is great.
>
> When I go full screen my aspect ratio is preserved but the x coordinate
> comes back with 0 being the left edge of the browser window even though my
> game window now starts centered. The end result is the X coordinate of the
> mouse is offset by a certain amount. I can adjust for that but I can't
> figure out how to calculate that value. I'm drowning in coordinates and
> pixels.
>
>
> [image: Capture.JPG]
>
>
> In the above screenshot my mouse is at the top left of the game window but
> the coordinate I get back via SDL is 123,0. The other params on the page
> are...
>
> MainWindow = my virtual resolution
> CSSWindow = the result of emscripten_get_element_css_size in the html5.h
> callback for canvasResizedCallback.
> CanvasWindow = the result of emscripten_get_canvas_element_size
>
> the ones starting me... are the results from the html5.h mousemove
> callback.
>
> The last two are from doing the same bit of code as the SDL_MouseMove
> messaage stuff.
>
> Basically, is there anyway to get my mouse coord back so 0,0 is always the
> top left of the game window?
>
> Thanks!
>
> Scott
>
>
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