Godot Tile Repeat Shader

uniform texture tilesheet;
uniform float repeat=16;
uniform float tileOffsetX=0;
uniform float tileOffsetY=0;
uniform float tileWidth=16;
uniform float tileHeight=16;
uniform float tilesheetWidth=101;
uniform float tilesheetHeight=169;

vec2 inverseTextureSize = vec2(1/tilesheetWidth, 1/tilesheetHeight);
vec2 tileSize           = vec2(tileWidth, tileHeight);
vec2 pixelCoord         = UV.xy * 1/TEXTURE_PIXEL_SIZE * repeat;

vec2 spriteOffset = vec2(tileOffsetX, tileOffsetY);
vec2 spriteCoord = mod(pixelCoord, tileSize);
vec2 texCoord = (spriteOffset + spriteCoord) * inverseTextureSize;

COLOR.rgba = tex(tilesheet, texCoord);
// Get rid of empty lines that are due to floating point errors
if (COLOR.a == 0) {
    COLOR.rgba = tex(tilesheet, texCoord-vec2(0.0, -inverseTextureSize.y));
}
COLOR.rgba = COLOR.rgba * SRC_COLOR;