program StageGuards
variant (base)
  uniform mat4 uProjectionMatrix
  uniform vec2 uVertexOnly
  uniform vec2 uVertexExpr
  texture uTexture unit=0
  attribute vec2 aPosition location=-1
  attribute vec2 aTexCoords location=-1
variant TINT
  define TINT
  uniform mat4 uProjectionMatrix
  uniform vec2 uVertexOnly
  uniform float uTintStrength
  uniform vec2 uTintShift
  uniform vec2 uVertexExpr
  uniform vec4 uTintColor
  uniform vec3 uTintExpr
  texture uTexture unit=0
  attribute vec2 aPosition location=-1
  attribute vec2 aTexCoords location=-1
