Transparency not working when custom-shader is defined

[ryanfelder]

It seems that when I enable a custom-shader, my terminal is no longer transparent.
I can toggle this behavior with a single # character.
I am on Fedora 41, with Nvidia proprietary drivers and a Geforce RTX 3060.

Here is my ghostty config

window-decoration=true  
gtk-titlebar=false  
window-padding-x=8  
window-padding-y=8  
background=#22190B  
foreground=#E1CBA6  
background-opacity=0.7  
#custom-shader=/home/ryan/Programs/ghostty/shaders/bloom075.glsl  

[rhodes-b]

The shader needs to support transparency, shaders draw on top of the background and if they override the background then it will no longer be transparent

[GlitchedCode]

I kind of fixed it for me by screwing around with glBlendFunc params. Don't know the exact ramifications of my edits but i will leave them here @mitchellh

GlitchedCode@0252db6

[soanvig]

@GlitchedCode looks nice!

Could you test if given shader still works? Its purpose is to make all color changes "fading". Probably without accumulating colors it simplywon't work. It's not a problem by any means, to me if a "bug" is fixed then it's much better situation anyway.

void mainImage(out vec4 fragColor, in vec2 fragCoord) {
    fragColor = vec4(0.15*fragColor.rgb, 0.15);
}

[Uzaaft]

I kind of fixed it for me by screwing around with glBlendFunc params. Don't know the exact ramifications of my edits but i will leave them here @mitchellh GlitchedCode@0252db6

As a general rule of courtesy, dont ping the maintainer.

[d-itu]

I think maybe it's because the buffer is not cleared with a transparent color (for example glClear(...)) before rendering a frame.

[soanvig]

@00-KAMIDUKI
In my shader I have animation running a scan line from top to bottom, and that scan line seems to fix some of the issues related to that (like ghost images from previous renders etc), so you might be right