How to apply a filter (or shader) to the entire screen?

k-storm-studio-ltd

How to apply a filter (or shader) to the entire screen and post-process the entire window?

Cause I tried just creating a Canvas with a sprite but it does process the sprite but not the entire content behind

TwistedTwigleg

I would suggest using a ColorRect node or a TextureRect node, set the layout to full rect, and then write a CanvasItem shader on top of that. You will want to use SCREEN_TEXTURE and SCREEN_UV instead of TEXTURE and UV though.

A super simple shader that makes the screen always have a red tint:

shader_type canvas_item
void fragment() {
	vec3 screen_pixel = texture(SCREEN_TEXTURE, SCREEN_UV).rgb
	screen_pixel.r = 1
	COLOR = screen_pixel
}

k-storm-studio-ltd

shader_type canvas_item;

void fragment() { vec3 screen_pixel = texture(SCREEN_TEXTURE, SCREEN_UV).rgb; screen_pixel.r = 1; COLOR = screen_pixel; }

Error: invalid argment float or int at line (screen_pixel.r = 1;)

k-storm-studio-ltd

however I've tried with another simple shader algo but it doesnt produce any result, the TextureRectangle still remain transparent, invisible

TwistedTwigleg

@"K-Storm-Studio Ltd" said: shader_type canvas_item;

void fragment() { vec3 screen_pixel = texture(SCREEN_TEXTURE, SCREEN_UV).rgb; screen_pixel.r = 1; COLOR = screen_pixel; }

Error: invalid argment float or int at line (screen_pixel.r = 1;)

Try changing screen_pixel.r = 1; to screen_pixel.r = 1.0; and that should fix the error about the invalid argument (I think).