Re: Inverting draw mode?

Does GLSL ES have bitwise operators?  I would think you could invert in a
shader.

Jonny D

On Thu, Dec 8, 2016 at 7:12 AM, rtrussell <[email protected]> wrote:

>
>
>
> joymaker wrote:
>
> Is this at all supported? If not, I would urge its adoption as an
> additional "Blending mode".
>
>
> I rely on it. The solution I use is to force OpenGL (or GLES 1.0) when
> it's not the default:
>
>
>
>
> Code:
>
> SDL_SetHint (SDL_HINT_RENDER_DRIVER, "opengl") ;
> window = SDL_CreateWindow(..., SDL_WINDOW_OPENGL...) ;
>
>
> then you can enable the wanted drawing mode using:
>
>
>
>
> Code:
>
>    glEnable (GL_COLOR_LOGIC_OP) ;
>    glLogicOp (GL_XOR) ;
>
>
>
> Works perfectly for me on Windows, Linux, Mac OS and Android. It's
> unfortunate that support for glLogicOp was dropped from GLES 2.0 so on
> platforms which can't run full OpenGL you are forced to use the legacy GLES
> 1.0.
>
> Richard.
>
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>
>

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