declare const _default: "\nuniform sampler2D texture_msdfMap;\n\n#ifdef GL_OES_standard_derivatives\n#define USE_FWIDTH\n#endif\n\n#ifdef GL2\n#define USE_FWIDTH\n#endif\n\nfloat median(float r, float g, float b) {\n    return max(min(r, g), min(max(r, g), b));\n}\n\nfloat map (float min, float max, float v) {\n    return (v - min) / (max - min);\n}\n\nuniform float font_sdfIntensity; // intensity is used to boost the value read from the SDF, 0 is no boost, 1.0 is max boost\nuniform float font_pxrange;      // the number of pixels between inside and outside the font in SDF\nuniform float font_textureWidth; // the width of the texture atlas\n\n#ifdef UNIFORM_TEXT_PARAMETERS\nuniform vec4 outline_color;\nuniform float outline_thickness;\nuniform vec4 shadow_color;\nuniform vec2 shadow_offset;\n#else\nvarying vec4 outline_color;\nvarying float outline_thickness;\nvarying vec4 shadow_color;\nvarying vec2 shadow_offset;\n#endif\n\nvec4 applyMsdf(vec4 color) {\n    // sample the field\n    vec3 tsample = texture2D(texture_msdfMap, vUv0).rgb;\n    vec2 uvShdw = vUv0 - shadow_offset;\n    vec3 ssample = texture2D(texture_msdfMap, uvShdw).rgb;\n    // get the signed distance value\n    float sigDist = median(tsample.r, tsample.g, tsample.b);\n    float sigDistShdw = median(ssample.r, ssample.g, ssample.b);\n\n    // smoothing limit - smaller value makes for sharper but more aliased text, especially on angles\n    // too large value (0.5) creates a dark glow around the letters\n    float smoothingMax = 0.2;\n\n    #ifdef USE_FWIDTH\n    // smoothing depends on size of texture on screen\n    vec2 w = fwidth(vUv0);\n    float smoothing = clamp(w.x * font_textureWidth / font_pxrange, 0.0, smoothingMax);\n    #else\n    float font_size = 16.0; // TODO fix this\n    // smoothing gets smaller as the font size gets bigger\n    // don't have fwidth we can approximate from font size, this doesn't account for scaling\n    // so a big font scaled down will be wrong...\n    float smoothing = clamp(font_pxrange / font_size, 0.0, smoothingMax);\n    #endif\n\n    float mapMin = 0.05;\n    float mapMax = clamp(1.0 - font_sdfIntensity, mapMin, 1.0);\n\n    // remap to a smaller range (used on smaller font sizes)\n    float sigDistInner = map(mapMin, mapMax, sigDist);\n    float sigDistOutline = map(mapMin, mapMax, sigDist + outline_thickness);\n    sigDistShdw = map(mapMin, mapMax, sigDistShdw + outline_thickness);\n\n    float center = 0.5;\n    // calculate smoothing and use to generate opacity\n    float inside = smoothstep(center-smoothing, center+smoothing, sigDistInner);\n    float outline = smoothstep(center-smoothing, center+smoothing, sigDistOutline);\n    float shadow = smoothstep(center-smoothing, center+smoothing, sigDistShdw);\n\n    vec4 tcolor = (outline > inside) ? outline * vec4(outline_color.a * outline_color.rgb, outline_color.a) : vec4(0.0);\n    tcolor = mix(tcolor, color, inside);\n\n    vec4 scolor = (shadow > outline) ? shadow * vec4(shadow_color.a * shadow_color.rgb, shadow_color.a) : tcolor;\n    tcolor = mix(scolor, tcolor, outline);\n    \n    return tcolor;\n}\n";
export default _default;