text: import {WEBGL_INFO} from "../../webglInfo.js";
  
  /**
   * @private
   */
  class EmphasisFillShaderSource {
      constructor(mesh) {
          this.vertex = buildVertex(mesh);
          this.fragment = buildFragment(mesh);
      }
  }
  
  function buildVertex(mesh) {
  
      const scene = mesh.scene;
      const lightsState = scene._lightsState;
      const normals = hasNormals(mesh);
      const clipping = scene._sectionPlanesState.sectionPlanes.length > 0;
      const quantizedGeometry = !!mesh._geometry._state.compressGeometry;
      const billboard = mesh._state.billboard;
      const stationary = mesh._state.stationary;
      const src = [];
  
      src.push("// EmphasisFillShaderSource vertex shader");
      if (scene.logarithmicDepthBufferEnabled && WEBGL_INFO.SUPPORTED_EXTENSIONS["EXT_frag_depth"]) {
          src.push("#extension GL_EXT_frag_depth : enable");
      }
      src.push("attribute vec3 position;");
      src.push("uniform mat4 modelMatrix;");
      src.push("uniform mat4 viewMatrix;");
      src.push("uniform mat4 projMatrix;");
      src.push("uniform vec4 colorize;");
      src.push("uniform vec3 offset;");
      if (quantizedGeometry) {
          src.push("uniform mat4 positionsDecodeMatrix;");
      }
      if (scene.logarithmicDepthBufferEnabled) {
          src.push("uniform float logDepthBufFC;");
          if (WEBGL_INFO.SUPPORTED_EXTENSIONS["EXT_frag_depth"]) {
              src.push("varying float vFragDepth;");
          }
      }
      if (clipping) {
          src.push("varying vec4 vWorldPosition;");
      }
      src.push("uniform vec4   lightAmbient;");
      src.push("uniform vec4   fillColor;");
      if (normals) {
          src.push("attribute vec3 normal;");
          src.push("uniform mat4 modelNormalMatrix;");
          src.push("uniform mat4 viewNormalMatrix;");
          for (let i = 0, len = lightsState.lights.length; i < len; i++) {
              const light = lightsState.lights[i];
              if (light.type === "ambient") {
                  continue;
              }
              src.push("uniform vec4 lightColor" + i + ";");
              if (light.type === "dir") {
                  src.push("uniform vec3 lightDir" + i + ";");
              }
              if (light.type === "point") {
                  src.push("uniform vec3 lightPos" + i + ";");
              }
              if (light.type === "spot") {
                  src.push("uniform vec3 lightPos" + i + ";");
              }
          }
          if (quantizedGeometry) {
              src.push("vec3 octDecode(vec2 oct) {");
              src.push("    vec3 v = vec3(oct.xy, 1.0 - abs(oct.x) - abs(oct.y));");
              src.push("    if (v.z < 0.0) {");
              src.push("        v.xy = (1.0 - abs(v.yx)) * vec2(v.x >= 0.0 ? 1.0 : -1.0, v.y >= 0.0 ? 1.0 : -1.0);");
              src.push("    }");
              src.push("    return normalize(v);");
              src.push("}");
          }
      }
      src.push("varying vec4 vColor;");
      if (billboard === "spherical" || billboard === "cylindrical") {
          src.push("void billboard(inout mat4 mat) {");
          src.push("   mat[0][0] = 1.0;");
          src.push("   mat[0][1] = 0.0;");
          src.push("   mat[0][2] = 0.0;");
          if (billboard === "spherical") {
              src.push("   mat[1][0] = 0.0;");
              src.push("   mat[1][1] = 1.0;");
              src.push("   mat[1][2] = 0.0;");
          }
          src.push("   mat[2][0] = 0.0;");
          src.push("   mat[2][1] = 0.0;");
          src.push("   mat[2][2] =1.0;");
          src.push("}");
      }
      src.push("void main(void) {");
      src.push("vec4 localPosition = vec4(position, 1.0); ");
      src.push("vec4 worldPosition;");
      if (quantizedGeometry) {
          src.push("localPosition = positionsDecodeMatrix * localPosition;");
      }
      if (normals) {
          if (quantizedGeometry) {
              src.push("vec4 localNormal = vec4(octDecode(normal.xy), 0.0); ");
          } else {
              src.push("vec4 localNormal = vec4(normal, 0.0); ");
          }
          src.push("mat4 modelNormalMatrix2 = modelNormalMatrix;");
          src.push("mat4 viewNormalMatrix2 = viewNormalMatrix;");
      }
      src.push("mat4 viewMatrix2 = viewMatrix;");
      src.push("mat4 modelMatrix2 = modelMatrix;");
      if (stationary) {
          src.push("viewMatrix2[3][0] = viewMatrix2[3][1] = viewMatrix2[3][2] = 0.0;")
      }
      if (billboard === "spherical" || billboard === "cylindrical") {
          src.push("mat4 modelViewMatrix = viewMatrix2 * modelMatrix2;");
          src.push("billboard(modelMatrix2);");
          src.push("billboard(viewMatrix2);");
          src.push("billboard(modelViewMatrix);");
          if (normals) {
              src.push("mat4 modelViewNormalMatrix =  viewNormalMatrix2 * modelNormalMatrix2;");
              src.push("billboard(modelNormalMatrix2);");
              src.push("billboard(viewNormalMatrix2);");
              src.push("billboard(modelViewNormalMatrix);");
          }
          src.push("worldPosition = modelMatrix2 * localPosition;");
          src.push("vec4 viewPosition = modelViewMatrix * localPosition;");
      } else {
          src.push("worldPosition = modelMatrix2 * localPosition;");
          src.push("worldPosition.xyz = worldPosition.xyz + offset;");
          src.push("vec4 viewPosition  = viewMatrix2 * worldPosition; ");
      }
      if (normals) {
          src.push("vec3 viewNormal = normalize((viewNormalMatrix2 * modelNormalMatrix2 * localNormal).xyz);");
      }
      src.push("vec3 reflectedColor = vec3(0.0, 0.0, 0.0);");
      src.push("vec3 viewLightDir = vec3(0.0, 0.0, -1.0);");
      src.push("float lambertian = 1.0;");
      if (normals) {
          for (let i = 0, len = lightsState.lights.length; i < len; i++) {
              const light = lightsState.lights[i];
              if (light.type === "ambient") {
                  continue;
              }
              if (light.type === "dir") {
                  if (light.space === "view") {
                      src.push("viewLightDir = normalize(lightDir" + i + ");");
                  } else {
                      src.push("viewLightDir = normalize((viewMatrix2 * vec4(lightDir" + i + ", 0.0)).xyz);");
                  }
              } else if (light.type === "point") {
                  if (light.space === "view") {
                      src.push("viewLightDir = normalize(lightPos" + i + " - viewPosition.xyz);");
                  } else {
                      src.push("viewLightDir = normalize((viewMatrix2 * vec4(lightPos" + i + ", 0.0)).xyz);");
                  }
              } else {
                  continue;
              }
              src.push("lambertian = max(dot(-viewNormal, viewLightDir), 0.0);");
              src.push("reflectedColor += lambertian * (lightColor" + i + ".rgb * lightColor" + i + ".a);");
          }
      }
      // TODO: A blending mode for emphasis materials, to select add/multiply/mix
      //src.push("vColor = vec4((mix(reflectedColor, fillColor.rgb, 0.7)), fillColor.a);");
      src.push("vColor = vec4(reflectedColor * fillColor.rgb, fillColor.a);");
      //src.push("vColor = vec4(reflectedColor + fillColor.rgb, fillColor.a);");
      if (clipping) {
          src.push("vWorldPosition = worldPosition;");
      }
      if (mesh._geometry._state.primitiveName === "points") {
          src.push("gl_PointSize = pointSize;");
      }
      src.push("vec4 clipPos = projMatrix * viewPosition;");
      if (scene.logarithmicDepthBufferEnabled) {
          if (WEBGL_INFO.SUPPORTED_EXTENSIONS["EXT_frag_depth"]) {
              src.push("vFragDepth = 1.0 + clipPos.w;");
          } else {
              src.push("clipPos.z = log2( max( 1e-6, clipPos.w + 1.0 ) ) * logDepthBufFC - 1.0;");
              src.push("clipPos.z *= clipPos.w;");
          }
      }
      src.push("gl_Position = clipPos;");
      src.push("}");
      return src;
  }
  
  function hasNormals(mesh) {
      const primitive = mesh._geometry._state.primitiveName;
      if ((mesh._geometry._state.autoVertexNormals || mesh._geometry._state.normalsBuf) && (primitive === "triangles" || primitive === "triangle-strip" || primitive === "triangle-fan")) {
          return true;
      }
      return false;
  }
  
  function buildFragment(mesh) {
  
      const scene = mesh.scene;
      const sectionPlanesState = mesh.scene._sectionPlanesState;
      const gammaOutput = mesh.scene.gammaOutput;
      const clipping = sectionPlanesState.sectionPlanes.length > 0;
      const src = [];
  
      src.push("// Lambertian drawing fragment shader");
  
      if (scene.logarithmicDepthBufferEnabled && WEBGL_INFO.SUPPORTED_EXTENSIONS["EXT_frag_depth"]) {
          src.push("#extension GL_EXT_frag_depth : enable");
      }
  
      src.push("#ifdef GL_FRAGMENT_PRECISION_HIGH");
      src.push("precision highp float;");
      src.push("precision highp int;");
      src.push("#else");
      src.push("precision mediump float;");
      src.push("precision mediump int;");
      src.push("#endif");
  
      if (scene.logarithmicDepthBufferEnabled && WEBGL_INFO.SUPPORTED_EXTENSIONS["EXT_frag_depth"]) {
          src.push("uniform float logDepthBufFC;");
          src.push("varying float vFragDepth;");
      }
  
      if (gammaOutput) {
          src.push("uniform float gammaFactor;");
          src.push("vec4 linearToGamma( in vec4 value, in float gammaFactor ) {");
          src.push("  return vec4( pow( value.xyz, vec3( 1.0 / gammaFactor ) ), value.w );");
          src.push("}");
      }
      if (clipping) {
          src.push("varying vec4 vWorldPosition;");
          src.push("uniform bool clippable;");
          for (let i = 0, len = sectionPlanesState.sectionPlanes.length; i < len; i++) {
              src.push("uniform bool sectionPlaneActive" + i + ";");
              src.push("uniform vec3 sectionPlanePos" + i + ";");
              src.push("uniform vec3 sectionPlaneDir" + i + ";");
          }
      }
      src.push("varying vec4 vColor;");
      src.push("void main(void) {");
      if (clipping) {
          src.push("if (clippable) {");
          src.push("  float dist = 0.0;");
          for (let i = 0, len = sectionPlanesState.sectionPlanes.length; i < len; i++) {
              src.push("if (sectionPlaneActive" + i + ") {");
              src.push("   dist += clamp(dot(-sectionPlaneDir" + i + ".xyz, vWorldPosition.xyz - sectionPlanePos" + i + ".xyz), 0.0, 1000.0);");
              src.push("}");
          }
          src.push("  if (dist > 0.0) { discard; }");
          src.push("}");
      }
      if (mesh._geometry._state.primitiveName === "points") {
          src.push("vec2 cxy = 2.0 * gl_PointCoord - 1.0;");
          src.push("float r = dot(cxy, cxy);");
          src.push("if (r > 1.0) {");
          src.push("   discard;");
          src.push("}");
      }
      if (scene.logarithmicDepthBufferEnabled && WEBGL_INFO.SUPPORTED_EXTENSIONS["EXT_frag_depth"]) {
          src.push("gl_FragDepthEXT = log2( vFragDepth ) * logDepthBufFC * 0.5;");
      }
      if (gammaOutput) {
          src.push("gl_FragColor = linearToGamma(vColor, gammaFactor);");
      } else {
          src.push("gl_FragColor = vColor;");
      }
      src.push("}");
      return src;
  }
  
  export {EmphasisFillShaderSource};