{
   GLuint i, j;
    
   memset(key, 0, sizeof(*key));

   for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
      const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[i];
      GLenum format;

      if (!texUnit->_ReallyEnabled || !texUnit->Enabled)
         continue;

      format = texUnit->_Current->Image[0][texUnit->_Current->BaseLevel]->_BaseFormat;

      key->unit[i].enabled = 1;
      key->enabled_units |= (1<<i);

      key->unit[i].source_index = 
     translate_tex_src_bit(texUnit->_ReallyEnabled);        
      key->unit[i].shadow = ((texUnit->_Current->CompareMode == GL_COMPARE_R_TO_TEXTURE) && 
                             ((format == GL_DEPTH_COMPONENT) || 
                              (format == GL_DEPTH_STENCIL_EXT)));

      key->unit[i].NumArgsRGB = texUnit->_CurrentCombine->_NumArgsRGB;
      key->unit[i].NumArgsA = texUnit->_CurrentCombine->_NumArgsA;

      key->unit[i].ModeRGB =
     translate_mode(texUnit->_CurrentCombine->ModeRGB);
      key->unit[i].ModeA =
     translate_mode(texUnit->_CurrentCombine->ModeA);
        
      key->unit[i].ScaleShiftRGB = texUnit->_CurrentCombine->ScaleShiftRGB;
      key->unit[i].ScaleShiftA = texUnit->_CurrentCombine->ScaleShiftA;

      for (j=0;j<3;j++) {
         key->unit[i].OptRGB[j].Operand =
        translate_operand(texUnit->_CurrentCombine->OperandRGB[j]);
         key->unit[i].OptA[j].Operand =
        translate_operand(texUnit->_CurrentCombine->OperandA[j]);
         key->unit[i].OptRGB[j].Source =
        translate_source(texUnit->_CurrentCombine->SourceRGB[j]);
         key->unit[i].OptA[j].Source =
        translate_source(texUnit->_CurrentCombine->SourceA[j]);
      }
   }
    
   if (ctx->_TriangleCaps & DD_SEPARATE_SPECULAR)
      key->separate_specular = 1;

   if (ctx->Fog.Enabled) {
      key->fog_enabled = 1;
      key->fog_mode = translate_fog_mode(ctx->Fog.Mode);
   }
}

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