source/blender/gpu/shaders/gpu_shader_cfg_world_clip_lib.glsl


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#ifdef USE_WORLD_CLIP_PLANES
#  if defined(GPU_VERTEX_SHADER) || defined(GPU_GEOMETRY_SHADER)
uniform vec4 WorldClipPlanes[6];
void world_clip_planes_calc_clip_distance(vec3 wpos)
{
  gl_ClipDistance[0] = dot(WorldClipPlanes[0].xyz, wpos) + WorldClipPlanes[0].w;
  gl_ClipDistance[1] = dot(WorldClipPlanes[1].xyz, wpos) + WorldClipPlanes[1].w;
  gl_ClipDistance[2] = dot(WorldClipPlanes[2].xyz, wpos) + WorldClipPlanes[2].w;
  gl_ClipDistance[3] = dot(WorldClipPlanes[3].xyz, wpos) + WorldClipPlanes[3].w;
  gl_ClipDistance[4] = dot(WorldClipPlanes[4].xyz, wpos) + WorldClipPlanes[4].w;
  gl_ClipDistance[5] = dot(WorldClipPlanes[5].xyz, wpos) + WorldClipPlanes[5].w;
}
#  endif

#  define world_clip_planes_set_clip_distance(c) \
    { \
      gl_ClipDistance[0] = (c)[0]; \
      gl_ClipDistance[1] = (c)[1]; \
      gl_ClipDistance[2] = (c)[2]; \
      gl_ClipDistance[3] = (c)[3]; \
      gl_ClipDistance[4] = (c)[4]; \
      gl_ClipDistance[5] = (c)[5]; \
    }

#endif