export declare const vs = "#define SHADER_NAME flow-path-layer-vertex-shader\n\nattribute vec3 positions;\nattribute vec3 instanceSourcePositions;\nattribute vec3 instanceTargetPositions;\nattribute vec4 instanceSourceTargetPositions64xyLow;\nattribute vec4 instanceColors;\nattribute vec3 instancePickingColors;\nattribute float instanceWidths;\nattribute float instanceSpeeds;\nattribute float instanceOffsets;\nattribute float instanceTailLengths;\n\nuniform float opacity;\nuniform float widthScale;\nuniform float widthMinPixels;\nuniform float widthMaxPixels;\n\nvarying vec4 vColor;\nvarying float segmentIndex;\nvarying float speed;\nvarying float pathLength;\nvarying float tailLength;\nvarying float offset;\n\n// offset vector by strokeWidth pixels\n// offset_direction is -1 (left) or 1 (right)\nvec2 getExtrusionOffset(vec2 line_clipspace, float offset_direction, float width) {\n  // normalized direction of the line\n  vec2 dir_screenspace = normalize(line_clipspace * project_uViewportSize);\n  // rotate by 90 degrees\n  dir_screenspace = vec2(-dir_screenspace.y, dir_screenspace.x);\n\n  vec2 offset_screenspace = dir_screenspace * offset_direction * width / 2.0;\n  vec2 offset_clipspace = project_pixel_size_to_clipspace(offset_screenspace);\n\n  return offset_clipspace;\n}\n\nvoid main(void) {\n  // Position\n  vec4 source = project_position_to_clipspace(instanceSourcePositions, instanceSourceTargetPositions64xyLow.xy, vec3(0.));\n  vec4 target = project_position_to_clipspace(instanceTargetPositions, instanceSourceTargetPositions64xyLow.zw, vec3(0.));\n\n  // Multiply out width and clamp to limits\n  float widthPixels = clamp(\n    project_size_to_pixel(instanceWidths * widthScale),\n    widthMinPixels, widthMaxPixels\n  );\n\n  // linear interpolation of source & target to pick right coord\n  segmentIndex = positions.x;\n  speed = instanceSpeeds;\n  tailLength = project_size_to_pixel(instanceTailLengths * widthScale);\n  offset = instanceOffsets;\n  pathLength = distance(instanceSourcePositions, instanceTargetPositions);\n  vec4 p = mix(source, target, segmentIndex);\n\n  // extrude\n  vec2 offset = getExtrusionOffset(target.xy - source.xy, positions.y, widthPixels);\n  gl_Position = p + vec4(offset, 0.0, 0.0);\n\n  // Color\n  vColor = vec4(instanceColors.rgb, instanceColors.a * opacity) / 255.;\n\n  // Set color to be rendered to picking fbo (also used to check for selection highlight).\n  picking_setPickingColor(instancePickingColors);\n}\n";
//# sourceMappingURL=flow-path-layer-vertex.glsl.d.ts.map