1 files changed, 22 insertions, 0 deletions
diff --git a/src/addons/GifMaker/godot-gdgifexporter/gdgifexporter/lookup_similar.shader b/src/addons/GifMaker/godot-gdgifexporter/gdgifexporter/lookup_similar.shader
new file mode 100644
index 0000000..0614661
--- /dev/null
+++ b/src/addons/GifMaker/godot-gdgifexporter/gdgifexporter/lookup_similar.shader
@@ -0,0 +1,22 @@
+shader_type canvas_item;
+render_mode unshaded;
+
+uniform sampler2D lut;
+
+void fragment() {
+	vec4 color = texture(TEXTURE, UV);
+	vec4 similar = texture(lut, vec2(0.5 / 256.0, 0.5));
+	float index = 0.0;
+	if (color.a > 0.0) {
+		float dist = distance(color.xyz, similar.xyz);
+		for (int i = 1; i < 256; i++) {
+			vec4 c = texture(lut, vec2((float(i) + 0.5) / 256.0, 0.5));
+			float d = distance(color.xyz, c.xyz);
+			if (d < dist) {
+				dist = d;
+				index = float(i) / 255.0;
+			}
+		}
+	}
+	COLOR = vec4(vec3(index), 1.0);
+}
+\ No newline at end of file