const GLchar *vertSource = \
        "#version 110\n"
        "\n"
        "attribute vec3 Vert;\n"
        "attribute vec2 TexCoords;\n"
        "attribute vec2 LMCoords;\n"
        "\n"
        "varying float FogFragCoord;\n"
        "varying vec2 tc_tex; varying vec2 tc_lm;"
        "\n"
        "void main()\n"
        "{\n"
        "   tc_tex = TexCoords;\n"
        "   tc_lm = LMCoords;\n"
        "   gl_Position = gl_ModelViewProjectionMatrix * vec4(Vert, 1.0);\n"
        "   FogFragCoord = gl_Position.w;\n"
        "}\n";

    const GLchar *fragSource = \
        "#version 110\n"
        "\n"
        "uniform sampler2D Tex;\n"
        "uniform sampler2D LMTex;\n"
        "uniform sampler2D FullbrightTex;\n"
        "uniform bool UseFullbrightTex;\n"
        "uniform bool UseOverbright;\n"
        "uniform bool UseAlphaTest;\n"
        "uniform float Alpha;\n"
        "\n"
        "varying float FogFragCoord;\n"
        "varying vec2 tc_tex; varying vec2 tc_lm;"
        "\n"
        "void main()\n"
        "{\n"
        "   vec4 result = texture2D(Tex, tc_tex.xy);\n"
        "   if (UseAlphaTest && (result.a < 0.666))\n"
        "       discard;\n"
        "   result *= texture2D(LMTex, tc_lm.xy);\n"
        "   if (UseOverbright)\n"
        "       result.rgb *= 2.0;\n"
        "   if (UseFullbrightTex)\n"
        "       result += texture2D(FullbrightTex, tc_tex.xy);\n"
        "   result = clamp(result, 0.0, 1.0);\n"
        "   float fog = exp(-gl_Fog.density * gl_Fog.density * FogFragCoord * FogFragCoord);\n"
        "   fog = clamp(fog, 0.0, 1.0);\n"
        "   result = mix(gl_Fog.color, result, fog);\n"
        "   result.a = Alpha;\n" // FIXME: This will make almost transparent things cut holes though heavy fog
        "   gl_FragColor = result;\n"
        "}\n";