GL_ARB_FRAGMENT_PROGRAM vs CG_PROFILE_FP30

Hello Guy

I tested arb_fragment program and CG fragment program, and the results are 
not the same. I kept the rest of the code. CG looks darker. Any clue?. I am 
using pre-integration volume rendering with 3D textures. Texture0 and 1 are 
the same source 3D texture... texture2 is the dependent 2D texture.

Thanks


const char program[] =
"!!ARBfp1.0\n\
TEMP texel0, texel1, tc2;\n\
OUTPUT texel2 = result.color;\n\
TEX texel0, fragment.texcoord[0], texture[0], 3D;\n\
TEX texel1, fragment.texcoord[1], texture[1], 3D;\n\
MOV tc2.x, texel0.r;\n\
MOV tc2.y, texel1.r;\n\
TEX texel2, tc2, texture[2], 2D;\n\
END\n\
";


const char PCG_CODE[] =
"float4 main(float3 FrontCoords : TEXCOORD0, float3 BackCoords : TEXCOORD1, 
uniform sampler3D FrontTexture : TEXUNIT0, uniform sampler3D BackTexture : 
TEXUNIT1, uniform sampler2D DependentTexture : TEXUNIT2): COLOR\n\
{\n\
 float4 OUT;\n\
  float fc,bc;\n\
  fc = tex3D(FrontTexture, FrontCoords).r;\n\
  bc = tex3D(BackTexture, BackCoords).r;\n\
  float2 dependcoor = (fc,bc);\n\
  OUT = f4tex2D(DependentTexture, dependcoor);\n\
 return OUT;\n\
}";

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