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przygody-pana-cegly/examples/edge_shader/edge_shader.gdshader

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shader_type canvas_item;
/**
* This shader fixes normal textures looking wrong when used with SmartShape2D.
* See: https://github.com/SirRamEsq/SmartShape2D/blob/master/addons/rmsmartshape/documentation/Normals.md
*/
varying mat2 NORMAL_MATRIX;
void vertex() {
NORMAL_MATRIX = mat2(COLOR.rg, COLOR.ba) * 2.0 - mat2(vec2(1.0), vec2(1.0));
}
void fragment() {
NORMAL.xy = NORMAL_MATRIX * NORMAL.xy;
COLOR = texture(TEXTURE, UV);
}