@itwin/core-frontend/lib/cjs/internal/render/webgl/glsl/Polyline.d.ts

iTwin.js frontend components

/** @packageDocumentation
 * @module WebGL
 */
import { FragmentShaderBuilder, ProgramBuilder, VertexShaderBuilder } from "../ShaderBuilder";
import { IsInstanced, PositionType } from "../TechniqueFlags";
/** @internal */
export declare const adjustWidth = "\nvoid adjustWidth(inout float width, vec2 d2, vec2 org) {\n  if (u_aaSamples > 1) {\n    if (width < 5.0)\n      width += (5.0 - width) * 0.125;\n    return;\n  }\n\n  // calculate slope based width adjustment for non-AA lines, widths 1 to 4\n  vec2 d2A = abs(d2);\n  const float s_myFltEpsilon = 0.0001;  // limit test resolution to 4 digits in case 24 bit (s16e7) is used in hardware\n  if (d2A.y > s_myFltEpsilon && width < 4.5) {\n    float len = length(d2A);\n    float tan = d2A.x / d2A.y;\n\n    if (width < 1.5) { // width 1\n      if (tan <= 1.0)\n        width = d2A.y;\n      else\n        width = d2A.x;\n      // width 1 requires additional adjustment plus trimming in frag shader using v_lnInfo\n      width *= 1.01;\n      v_lnInfo.xy = org;\n      v_lnInfo.w = 1.0; // set flag to do trimming\n      // set slope in v_lnInfo.z\n      if (d2A.x - d2A.y > s_myFltEpsilon) {\n        v_lnInfo.z = d2.y / d2.x;\n        v_lnInfo.w += 2.0; // add in x-major flag\n      } else\n        v_lnInfo.z = d2.x / d2.y;\n\n    } else if (width < 2.5) { // width 2\n      if (tan <= 0.5)\n        width = 2.0 * d2A.y;\n      else\n        width = (d2A.y + 2.0 * d2A.x);\n\n    } else if (width < 3.5) { // width 3\n        if (tan <= 1.0)\n            width = (3.0 * d2A.y + d2A.x);\n        else\n            width = (d2A.y + 3.0 * d2A.x);\n\n    } else { // if (width < 4.5) // width 4\n      if (tan <= 0.5)\n        width = (4.0 * d2A.y + d2A.x);\n      else if (tan <= 2.0)\n        width = (3.0 * d2A.y + 3.0 * d2A.x);\n      else\n        width = (d2A.y + 4.0 * d2A.x);\n    }\n    width /= len;\n  }\n}\n";
/** @internal */
export declare function addAdjustWidth(vert: VertexShaderBuilder): void;
/** @internal */
export declare function addLineCodeTexture(frag: FragmentShaderBuilder): void;
/** @internal */
export declare function addLineCode(prog: ProgramBuilder, args: string): void;
/** @internal */
export declare function createPolylineBuilder(isInstanced: IsInstanced, positionType: PositionType): ProgramBuilder;
/** @internal */
export declare function createPolylineHiliter(isInstanced: IsInstanced, positionType: PositionType): ProgramBuilder;
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