A recipe for motion blur?

[CrazyDiamond]

Hey folks,

Does anyone have any pointers (or the actual code!) for applying motion blur to a layer?

I have some parallax background layers that are just being moved with the horizontal speed setting in the background layer itself and it would really benefit from some motion blur.

I assume this is achieved with a shader? I googled and found some but I have no idea how they are applied to a specific layer.

 

[rIKmAN]

Hey folks,

Does anyone have any pointers (or the actual code!) for applying motion blur to a layer?

I have some parallax background layers that are just being moved with the horizontal speed setting in the background layer itself and it would really benefit from some motion blur.

I assume this is achieved with a shader? I googled and found some but I have no idea how they are applied to a specific layer.

You can use layer_script_begin() and layer_script_end() to run a shader for a specific layer/layers.

There are extended code examples on the manual pages I linked above which do exactly the process you are after.
Just amend the code to use your own layers/shader/uniforms etc as required.

 

[CrazyDiamond]

You can use layer_script_begin() and layer_script_end() to run a shader for a specific layer/layers.

There are extended code examples on the manual pages I linked above which do exactly the process you are after.
Just amend the code to use your own layers/shader/uniforms etc as required.

Thanks. I found a motion blur shader on this page: https://github.com/GameMakerDiscord/blur-shaders

varying vec2 v_vTexcoord;
varying vec4 v_vColour;
uniform vec2 pos;//x,y
const int Quality = 16;

void main()
{
    vec4 Color;
    for( float i=0.0;i<1.0;i+=1.0/float(Quality) )
    {
        Color += texture2D( gm_BaseTexture, v_vTexcoord+(0.5-pos)*i);
    }

    Color /= float(Quality);
    gl_FragColor =  Color *  v_vColour;
}

I have no idea about shaders! Do you just paste that into a shader? Is that the beginning? I see no mention in the shader tutorial about an end script.

 

[Nocturne]

You should read the entire page where you got that shader from instead of just copy/pasting what you think is appropriate. It does explain everything... Alternatively, check out this wonderful set of shader tutorials from @Xor (the same one user that made that github example you are copying from) then you'll know how that sample works: https://gmshaders.com/tutorials/gamemaker/

 

[CrazyDiamond]

You should read the entire page where you got that shader from instead of just copy/pasting what you think is appropriate. It does explain everything... Alternatively, check out this wonderful set of shader tutorials from @Xor (the same one user that made that github example you are copying from) then you'll know how that sample works: https://gmshaders.com/tutorials/gamemaker/

Thanks for the link. This looks like a really nice explanation. I will read it (all the way through!). Cheers.