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      1 /*
      2  * The existing isotropic vertex texture functions are added to the
      3  * built-in functions for fragment shaders.
      4  */
      5 vec4 texture1DLod    (sampler1D sampler, float coord, float lod);
      6 vec4 texture1DProjLod(sampler1D sampler, vec2  coord, float lod);
      7 vec4 texture1DProjLod(sampler1D sampler, vec4  coord, float lod);
      8 vec4 texture2DLod    (sampler2D sampler, vec2 coord, float lod);
      9 vec4 texture2DProjLod(sampler2D sampler, vec3 coord, float lod);
     10 vec4 texture2DProjLod(sampler2D sampler, vec4 coord, float lod);
     11 vec4 texture3DLod    (sampler3D sampler, vec3 coord, float lod);
     12 vec4 texture3DProjLod(sampler3D sampler, vec4 coord, float lod);
     13 vec4 textureCubeLod  (samplerCube sampler, vec3 coord, float lod);
     14 vec4 shadow1DLod    (sampler1DShadow sampler, vec3 coord, float lod);
     15 vec4 shadow2DLod    (sampler2DShadow sampler, vec3 coord, float lod);
     16 vec4 shadow1DProjLod(sampler1DShadow sampler, vec4 coord, float lod);
     17 vec4 shadow2DProjLod(sampler2DShadow sampler, vec4 coord, float lod);
     18