uniform sampler2D atlas_data;
in vec2 v_texCoord;

uniform vec4 uClipUV;
// uniform vec2 uSdfUV;
uniform vec4 uSdfConfig;
uniform int uMode;
uniform vec4 uBorder;
uniform vec4 uStroke;
uniform vec4 uFill;

float getUVScale(vec2 sdfUV) {
    float dx = dFdx(sdfUV.x);
    float dy = dFdy(sdfUV.y);
    return (sqrt(dx * dx + dy * dy) + sqrt(dy * dy + dx * dx)) * 0.5;
}

struct SDF {
    float outer;
    float inner;
};


vec4 getTexture(vec2 uv) {
    return texture(atlas_data, uv);
}

vec4 getMask(vec4 color, vec2 uv, vec2 st) {
    return color; // 默认不修改颜色
}

out vec4 fragColor;

void main() {
    vec4 fillColor = uFill;
    vec4 strokeColor = uStroke;

    float scale = getUVScale(v_texCoord);

    vec4 texture = getTexture(v_texCoord);
    float sdfRaw = 0.0;
    float mark = 0.0;

    float sdf;

    float sdfRadius = uSdfConfig.x;
    float expand = uBorder.x;
    float bleed = uBorder.y;

    float d = (texture.r - 0.75) * sdfRadius;
    float s = (d + expand / uSdfConfig.y) / scale + 0.5 + bleed;
    sdf = s; // Assuming SDF returns a single float, adjust as necessary

    if (uMode == -2) {
        fillColor = vec4(texture.rgb, fillColor.a);
    }

    if (gl_FragCoord.x < uClipUV.x || gl_FragCoord.y < uClipUV.y || gl_FragCoord.x > uClipUV.z || gl_FragCoord.y > uClipUV.w) {
        discard;
    }
    // Compute mask based on SDF
    float mask = clamp(sdf, 0.0, 1.0);
    // Final color blending logic here
    fragColor = vec4(fillColor.rgb + mark, fillColor.a * mask + mark);
}