Need help converting basic Shader to Godot 4

ElfBoy

Hey Friends!

I'm currently trying to convert this really basic blur shader to Godot 4.
I've been scratching my head on why it's wrong, but I'm also pretty terrible at shaders.

If anyone has any thoughts, it would be much apricated!

shader_type canvas_item;

uniform float blur_amount : hint_range(0, 5);

void fragment() {
	COLOR = textureLod(SCREEN_TEXTURE, SCREEN_UV, blur_amount);
}

Gowydot

ElfBoy
Found this similar code
https://docs.godotengine.org/en/stable/tutorials/shaders/screen-reading_shaders.html

Most of the time it's just syntax change. What I normally do is open a tab for version 3 and version 4 each, find the same description and plug in the new name.

cybereality

Look in the error console, it should tell you how to fix it.

ElfBoy

cybereality

Thanks for the recommendation. I must of had an error somewhere else at first because the error console didn't tell me anything right away.
But I just did it and here was the solution, just in-case anyone wants to know!

Thanks everyone!

shader_type canvas_item;

uniform sampler2D SCREEN_TEXTURE : hint_screen_texture, filter_linear_mipmap;
uniform float blur_amount = 2;

void fragment() {
	COLOR = textureLod(SCREEN_TEXTURE, SCREEN_UV, blur_amount);
}

SuperDoomKing

shader_type canvas_item;

uniform float blur_amount : hint_range(0, 5);
uniform sampler2D SCREEN_TEXTURE : hint_screen_texture, filter_linear_mipmap;

void fragment() {
	COLOR = textureLod(SCREEN_TEXTURE, SCREEN_UV, blur_amount);
}

Basically SCREEN_TEXTURE doesn't exist in Godot 4.0, so you have make a workaround for it.

felipefacundes

ElfBoy Thanks! It was the only code that worked in Godot 4.1.3

Zslotty

ElfBoy Legend