declare const _default: "\nprecision highp float;\n\n// Varyings from the vertex shader\nin vec2 v_uv;\nin vec2 v_worldPos;\n\n// Uniforms\nuniform float u_majorLineWidth, u_minorLineWidth, u_axisLineWidth;\nuniform vec3 u_majorLineColor, u_minorLineColor, u_baseColor;\nuniform vec3 u_xAxisColor, u_zAxisColor;\nuniform float u_majorGridDiv, u_baseAlpha;\nuniform vec2 u_resolution;\n\n// Output color\nout vec4 gColor;\n\nfloat saturate(float value) {\nreturn clamp(value, 0.0, 1.0);\n}\n\nvoid main() {\n    // Calculate derivatives for anti-aliasing\nvec4 uvDDXY = vec4(dFdx(v_uv), dFdy(v_uv));\nvec2 uvDeriv = vec2(length(uvDDXY.xz), length(uvDDXY.yw));\n\nvec4 worldPosDDXY = vec4(dFdx(v_worldPos), dFdy(v_worldPos));\nvec2 worldPosDeriv = vec2(length(worldPosDDXY.xz), length(worldPosDDXY.yw));\n\n    // Axis lines calculation\nfloat axisLineWidth = max(u_majorLineWidth, u_axisLineWidth);\n\nvec2 axisDrawWidth = vec2(axisLineWidth) + worldPosDeriv * 0.5; // Adjust for AA\nvec2 axisLineAA = worldPosDeriv * 1.5;\nvec2 axisLines2 = smoothstep(axisDrawWidth + axisLineAA, axisDrawWidth - axisLineAA, abs(v_worldPos.xy * 2.0));\naxisLines2 *= (axisLineWidth / axisDrawWidth);\n\n    // Major grid lines\nfloat div = max(2.0, round(u_majorGridDiv));\nvec2 majorUVDeriv = worldPosDeriv / div;\nfloat majorLineWidth = u_majorLineWidth / div;\nvec2 majorDrawWidth = clamp(vec2(majorLineWidth), majorUVDeriv, vec2(0.5));\nvec2 majorLineAA = majorUVDeriv * 1.5;\nvec2 majorGridUV = 1.0 - abs(fract(v_worldPos.xy / div) * 2.0 - 1.0);\nvec2 majorGrid2 = smoothstep(majorDrawWidth + majorLineAA, majorDrawWidth - majorLineAA, majorGridUV);\nmajorGrid2 *= (majorLineWidth / majorDrawWidth);\n\n    // Minor grid lines\nfloat minorLineWidth = u_minorLineWidth;\nbool minorInvertLine = minorLineWidth > 0.5;\nfloat minorTargetWidth = minorInvertLine ? 1.0 - minorLineWidth : minorLineWidth;\nvec2 minorDrawWidth = clamp(vec2(minorTargetWidth), uvDeriv, vec2(0.5));\nvec2 minorLineAA = uvDeriv * 1.5;\nvec2 minorGridUV = abs(fract(v_uv) * 2.0 - 1.0);\nminorGridUV = minorInvertLine ? minorGridUV : 1.0 - minorGridUV;\nvec2 minorGrid2 = smoothstep(minorDrawWidth + minorLineAA, minorDrawWidth - minorLineAA, minorGridUV);\nminorGrid2 *= (minorTargetWidth / minorDrawWidth);\n\nif(max(axisLines2.x, axisLines2.y) > 0.) {\n        // If we're drawing axis lines, don't draw grid lines on axis\nmajorGrid2 = vec2(0.);\nminorGrid2 = vec2(0.);\n}\n\n // Combine minor and major grid lines\nfloat minorGrid = mix(minorGrid2.x, 1.0, minorGrid2.y);\nfloat majorGrid = mix(majorGrid2.x, 1.0, majorGrid2.y);\n\n    // Final color calculations for grid\nvec3 gridColor = mix(u_baseColor, u_minorLineColor, minorGrid);\ngridColor = mix(gridColor, u_majorLineColor, majorGrid);\nfloat gridAlpha = u_baseAlpha;\n\n    // Apply base alpha to the grid lines\nif(minorGrid > 0.0) {\ngridAlpha = saturate(mix(gridAlpha, 1.0, minorGrid));\n}\nif(majorGrid > 0.0) {\ngridAlpha = saturate(mix(gridAlpha, 1.0, majorGrid));\n}\n\n    // Apply axis color to the axis lines\nvec3 axisColor = mix(vec3(1.), u_xAxisColor, step(0.5, abs(v_worldPos.x)));\naxisColor = mix(axisColor, u_zAxisColor, step(0.5, abs(v_worldPos.y)));\n\nvec3 finalColor = mix(gridColor, axisColor, max(axisLines2.x, axisLines2.y));\n\nif(max(axisLines2.x, axisLines2.y) > 0.) {\ngridAlpha = saturate(mix(gridAlpha, 1.0, max(axisLines2.x, axisLines2.y)));\n}\n\n    // Set the final fragment color\ngColor = vec4(finalColor, gridAlpha);\n}\n";
export default _default;