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Attention | Topic was automatically imported from the old Question2Answer platform. |
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Asked By | Whom |
I’m trying to create a shader to replace colors anywhere on the screen. As a starting point, I made a shader that should replace the color A with color B but I can’t make it work. The shader is attached to a ColorRect that is a child of a CanvasLayer. The only thing that happens is that the ColorRect becomes invisible. The scene tree looks like this:
Main
- Game
- CanvasLayer
-- ColorRect
This is my shader:
shader_type canvas_item;
uniform vec4 a: hint_color;
uniform vec4 b: hint_color;
void fragment() {
vec4 c = texture(SCREEN_TEXTURE, SCREEN_UV);
if (c == a) {
COLOR = b;
} else {
COLOR = c;
}
}
I’ve used similar shader for individual sprites without any problems. Only difference is that I replaced vec4 c = texture(TEXTURE, UV) with vec4 c = texture(SCREEN_TEXTURE, SCREEN_UV) so that it would work as a “full screen” shader. What am I missing here?
Edit: Weirdly enough, this hacky solution seems to work (?) but I still don’t understand why if (c == a) doesn’t work?
shader_type canvas_item;
uniform vec4 a: hint_color;
uniform vec4 b: hint_color;
void fragment() {
vec4 c = texture(SCREEN_TEXTURE, SCREEN_UV);
if (distance(c, a) <= 0.0001) {
c = b;
}
COLOR = c;
}