File: FragmentTexture.cg

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// don't reference TEXCOORD0, it's and alias for POSITION
void fragment_program( in float2 tcoord : TEXCOORD0,
                       in float4 pos    : TEXCOORD1,
                       in float4 normal : TEXCOORD2,
                       in float4 col    : COLOR0,

                       uniform float3 opacity,
                       uniform sampler2D decal,

                       out float4 color  : COLOR
                       )
{
#if 0
  color.rg = tcoord.rg;
  color.b = 1.0;
#else
  color.rgb = tex2D(decal, tcoord);
#endif
  color.a = opacity;
}