bgfx/examples/39-assao/varying.def.sc

vec4 a_position  : POSITION;
vec2 a_texcoord0 : TEXCOORD0;
vec3 a_normal    : NORMAL;

vec2  v_texcoord0 : TEXCOORD0;
vec3 v_normal    : NORMAL    = vec3(0.0, 0.0, 1.0);