/**
 * Copyright (c) 2019-2026 mol* contributors, licensed under MIT, See LICENSE file for more info.
 *
 * @author Alexander Rose <alexander.rose@weirdbyte.de>
 * @author Gianluca Tomasello <giagitom@gmail.com>
 */
export declare const text_frag = "\nprecision highp float;\nprecision highp int;\n\n#include common\n#include common_frag_params\n#include color_frag_params\n#include common_clip\n\nuniform sampler2D tFont;\n\nuniform vec3 uBorderColor;\nuniform float uBorderWidth;\nuniform vec3 uBackgroundColor;\nuniform float uBackgroundOpacity;\n\nvarying vec2 vTexCoord;\n\nvoid main(){\n    #include fade_lod\n    #include clip_pixel\n\n    float fragmentDepth = gl_FragCoord.z;\n\n    // determine if this is a background or glyph fragment\n    bool isBackground = vTexCoord.x > 1.0;\n\n    // discard background for non-visual variants (depth, pick, marking, emissive)\n    #if !defined(dRenderVariant_color) && !defined(dRenderVariant_tracing)\n        if (isBackground) discard;\n    #endif\n\n    // SDF test for glyph fragments \u2014 discard pixels outside glyph+border\n    float rawSdf = 0.0;\n    if (!isBackground) {\n        rawSdf = texture2D(tFont, vTexCoord).a;\n        float sdf = rawSdf + min(uBorderWidth, 0.49); // clamp to avoid exceeding max SDF range\n        if (sdf < 0.5) discard;\n    }\n\n    #ifdef enabledFragDepth\n        gl_FragDepthEXT = fragmentDepth;\n    #endif\n\n    #include assign_material_color\n\n    if (isBackground) {\n        #if defined(dRenderVariant_color) || defined(dRenderVariant_tracing)\n            material = vec4(uBackgroundColor, uBackgroundOpacity * material.a);\n        #endif\n    } else {\n        #if defined(dRenderVariant_color) || defined(dRenderVariant_tracing)\n            if (uBorderWidth > 0.0 && rawSdf < 0.5) {\n                material.xyz = uBorderColor;\n            } else {\n                // push text fragments forward in depth so they render in front of border\n                #ifdef enabledFragDepth\n                    gl_FragDepthEXT = fragmentDepth - 0.0001;\n                #endif\n            }\n        #endif\n    }\n\n    #include check_transparency\n\n    #if defined(dRenderVariant_pick)\n        #include check_picking_alpha\n        #ifdef requiredDrawBuffers\n            gl_FragColor = vObject;\n            gl_FragData[1] = vInstance;\n            gl_FragData[2] = vGroup;\n            gl_FragData[3] = packDepthToRGBA(fragmentDepth);\n        #else\n            gl_FragColor = vColor;\n        #endif\n    #elif defined(dRenderVariant_depth)\n        gl_FragColor = material;\n    #elif defined(dRenderVariant_marking)\n        gl_FragColor = material;\n    #elif defined(dRenderVariant_emissive)\n        gl_FragColor = material;\n    #elif defined(dRenderVariant_color) || defined(dRenderVariant_tracing)\n        gl_FragColor = material;\n        #include apply_marker_color\n\n        #if defined(dRenderVariant_color)\n            #include apply_fog\n            #include wboit_write\n            #include dpoit_write\n        #elif defined(dRenderVariant_tracing)\n            gl_FragData[1] = vec4(-normalize(vViewPosition), emissive);\n            gl_FragData[2] = vec4(material.rgb, uDensity);\n        #endif\n    #endif\n}\n";