gdshader for rotated pixelart

gdshader

shader_type canvas_item;
render_mode blend_mix;

uniform float global_rotation = 0.0;

mat2 getRotationMatrix(float angle){
        float r = radians(angle);
        float cs = cos(r);
        float sn = sin(r);
        return mat2(
                vec2(cs ,-sn),
                vec2(sn , cs)
        );
}

vec2 getPixelatedUV(vec2 inUV, vec2 texel, float angle){
        mat2 rotCW = getRotationMatrix(-angle);
        mat2 rotCCW = getRotationMatrix(angle);
        return rotCW*floor((rotCCW*inUV)/texel)*texel;
}

void fragment(){
        vec2 newUV = getPixelatedUV(UV, TEXTURE_PIXEL_SIZE, global_rotation);
        COLOR = texture(TEXTURE, newUV);
}