source/blender/draw/modes/shaders/edit_mesh_overlay_mix_frag.glsl


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out vec4 FragColor;

uniform sampler2D wireColor;
uniform sampler2D wireDepth;
uniform sampler2D sceneDepth;
uniform float alpha;

void main()
{
  ivec2 uv = ivec2(gl_FragCoord.xy);
  float wire_depth = texelFetch(wireDepth, uv, 0).r;
  float scene_depth = texelFetch(sceneDepth, uv, 0).r;
  vec4 wire_color = texelFetch(wireColor, uv, 0).rgba;

  FragColor = wire_color;

  /* Modulate alpha if occluded */
  if (wire_depth > scene_depth) {
    FragColor.a *= alpha;
  }
}