写一段godot的shader代码

shader_type canvas_item;//左右偏移
uniform float offsetX;//上下偏移
uniform float offsetY;//颜色偏移
uniform vec4 colorOffset;//混合模式
uniform int blendMode;//混合因子
uniform float blendFactor;//滤镜
uniform sampler2D tex_filter;//输入纹理
uniform sampler2D tex;//纹理尺寸
uniform vec2 texSize;void fragment(){
//获取当前像素位置
vec2 uv = UV;
//计算偏移后的uv
uv.x = uv.x + offsetX / texSize.x;
uv.y = uv.y + offsetY / texSize.y;
//获取纹理颜色
vec4 color = texture(tex, uv);
//获取滤镜颜色
vec4 filterColor = texture(tex_filter, uv);
//混合颜色
vec4 blendedColor = color * (1.0 - blendFactor) + filterColor * blendFactor;
//颜色偏移
blendedColor = blendedColor + colorOffset;
//混合模式
blendedColor = blend_mode_process(blendMode, color, blendedColor);
//设置颜色
COLOR = blendedColor;
}