Scaling the effects of a shader

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1

Godot Version

4.3

Question

Hello,
I’ve made a compute shader that works on a pixel by pixel basis, and does effects based on a given pixel’s neighbors.
The problem is when I scale up the resolution the effect appears much smaller.

Is there a recommended way to approach this? I was thinking maybe downscaling the texture just for shader calculations, but I think it would just look low resolution…

Thank you!

2

Could you provide more information, what are you computing? Can you share screenshots of the effect? Is this part of 2D, 3D, or Control nodes?

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3

Here’s the basic glsl code, I’m trying to create a texture that holds the gradient change of color in the red and green channels

vec4 u_color_image = imageLoad(color_image, uv+ ivec2(0,1));
float u_color =  u_color_image.r + u_color_image.g + u_color_image.b;

vec4 b_color_image = imageLoad(color_image, uv+ ivec2(0,-1));
float b_color =  b_color_image.r + b_color_image.g + b_color_image.b;

vec4 l_color_image = imageLoad(color_image, uv+ ivec2(-1,0));
float l_color =  l_color_image.r + l_color_image.g + l_color_image.b;

vec4 r_color_image = imageLoad(color_image, uv+ ivec2(1,0));
float r_color =  r_color_image.r + r_color_image.g + r_color_image.b;

float up_down = u_color - b_color;
float left_right = l_color - r_color;

color = vec4(up_down, left_right, 0.0,0.0);
imageStore(setter_image, uv, color);

The problem is it looks directly at the 4 pixels neighboring the given pixel it’s running on - it looks good on low resolutions, but on high resolutions that relative gradient is much less as compared to the whole screen.

I’m using it as a CompositorEffect attached to a Camera3D

Thanks

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