Fragmented/examples/channel_offset.gdshader

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shader_type canvas_item;
//!load ./swamp.jpg
const vec2 offset_r = vec2(-0.002, -0.002);
const vec2 offset_g = vec2(0., 0.);
const vec2 offset_b = vec2(0.002, 0.002);
void fragment() {
COLOR.r = texture(TEXTURE , UV + offset_r).r;
COLOR.g = texture(TEXTURE , UV + offset_g).g;
COLOR.b = texture(TEXTURE , UV + offset_b).b;
COLOR.a = COLOR.a;
}