blender-archive/source/blender/gpu/shaders/gpu_shader_display_fallback_vert.glsl

vec2 normalize_coordinates()
{
  return (vec2(2.0) * (pos / fullscreen)) - vec2(1.0);
}

void main()
{
  gl_Position = vec4(normalize_coordinates(), 0.0, 1.0);
  texCoord_interp = texCoord;
}