cocos-creator-template/assets/chunks/legacy/main-functions/outline-vs.chunk

precision highp float;
#include <legacy/input-standard>
#include <builtin/uniforms/cc-global>
#include <legacy/local-batch>

out vec2 v_uv;

uniform OutlineVert {
  vec4 outlineParams; // x: line width, y: depth hack
};

vec4 vert () {
  StandardVertInput In;
  CCVertInput(In);

  mat4 matWorld;
  CCGetWorldMatrix(matWorld);

  float width = outlineParams.x * 0.001;

  #if USE_POSITION_SCALING
    vec3 dir = normalize(In.position.xyz);
    float flip = dot(dir, normalize(In.normal)) < 0.0 ? -1.0 : 1.0;
    In.position.xyz += flip * dir * width * 2.0;
    vec4 pos = cc_matProj * (cc_matView * matWorld) * In.position;
  #else
    In.position.xyz += normalize(In.normal) * width;
    vec4 pos = cc_matProj * (cc_matView * matWorld) * In.position;
  #endif

  float scaleZ = cc_nearFar.z == 0.0 ? 0.5 : 1.0;
  pos.z -= outlineParams.y * 0.002 * scaleZ;

  v_uv = a_texCoord;

  return pos;
}