Picom sharder to round specific corners

[carlosfmesilva]

I would like to round just the top-right and top-left corners using picom.

However, when I set corner-radius all corners are rounded.

Is there a way to differenciate between corners?

Thanks

[ikz87]

Interesting idea, will get to do it when I get the chance

[carlosfmesilva]

Thanks! I just do not have the knowlegde to do it :(.

[quantenzitrone]

this should do it
haven't tested it tho

#version 330
in vec2 texcoord;             // texture coordinate of the fragment

uniform float opacity;        // opacity of the window (0.0 - 1.0)
// don't use the picom provided value or default window shader will round all corners
// uniform float corner_radius;  // corner radius of the window (pixels)
uniform sampler2D tex;        // texture of the window
uniform float time;           // time in milliseconds, counting from an unspecified starting point

// tweakable variable (not the picom provided value)
uniform float corner_radius2;  // corner radius of the window (pixels)

// Default window post-processing:
// 1) invert color
// 2) opacity / transparency
// 3) max-brightness clamping
// 4) rounded corners
vec4 default_post_processing(vec4 c);

// get window size
ivec2 window_size = textureSize(tex, 0);

// Define useful functios
bool corner(bool left, bool top, float cx, float cy) {
    return (
        ((left   && texcoord.x < cx) || (!left && texcoord.x > cx))
        && ((top && texcoord.y < cy) || (!top  && texcoord.y > cy))
        && pow(cx-texcoord.x, 2)
            + pow(cy-texcoord.y, 2) 
            > pow(corner_radius2, 2)
    );
}
// Default window shader:
// 1) fetch the specified pixel
// 2) apply default post-processing
vec4 window_shader() {
    vec4 c = texelFetch(tex, ivec2(texcoord), 0);
    // Apply default_post_processing before doing any changes
    // to "paint" over the original window border
    c = default_post_processing(c);

    if (
        // top left
        corner(true,  true,  corner_radius2,               corner_radius2)
        // top right
        || corner(false, true,  window_size.x-corner_radius2, corner_radius2)
    )
        c.a = 0;
    
    return c;
}

i basically just deleted a lof of stuff from https://github.com/ikz87/picom-shaders/blob/main/Artistic/window_borders.glsl

edit: using custom variable for corner_radius as the picom config provided one will round all corners in default_post_processing

[quantenzitrone]

maybe one could try not using the default_post_processor and instead use https://github.com/yshui/picom/blob/c97008cd3af9fabeca2276156763fe21e12f3e58/src/backend/gl/shaders.c#L145-L191 as a reference to implement a custom one that doesn't round all corners

[carlosfmesilva]

I've tested the solution provided by @quantenzitrone using the glsl file, but it did not properly worked. The bottom is squared as expected, but the top is not properly antialised.

Moreover I've changed uniform float corner_radius2; to uniform float corner_radius2=6;.

[quantenzitrone]

yap the shader does not do antialiasing

Moreover I've changed uniform float corner_radius2; to uniform float corner_radius2=6;.

yeah i forgot to add that