Full stack: implement textureQueryLod(*) and textureQueryLevels(*).

Test/400.frag

@@ -138,4 +138,48 @@ void interp()
     float f;
     interpolateAtCentroid(f);           // ERROR, not interpolant
     interpolateAtSample(outp, 0);       // ERROR, not interpolant
-}
+}
+
+uniform sampler1D samp1D;
+uniform isampler2D isamp2D;
+uniform usampler3D usamp3D;
+uniform samplerCube sampCube; 
+uniform isampler1DArray isamp1DA;
+uniform usampler2DArray usamp2DA;
+uniform isamplerCubeArray isampCubeA;
+
+uniform sampler1DShadow samp1Ds;
+uniform sampler2DShadow samp2Ds;
+uniform samplerCubeShadow sampCubes;
+uniform sampler1DArrayShadow samp1DAs;
+uniform sampler2DArrayShadow samp2DAs;
+uniform samplerCubeArrayShadow sampCubeAs;
+
+uniform samplerBuffer sampBuf;
+uniform sampler2DRect sampRect;
+
+void qlod()
+{
+    vec2 lod;
+    float pf;
+    vec2 pf2;
+    vec3 pf3;
+
+    lod = textureQueryLod(samp1D, pf);
+    lod = textureQueryLod(isamp2D, pf2);
+    lod = textureQueryLod(usamp3D, pf3);
+    lod = textureQueryLod(sampCube, pf3);
+    lod = textureQueryLod(isamp1DA, pf);
+    lod = textureQueryLod(usamp2DA, pf2);
+    lod = textureQueryLod(isampCubeA, pf3);
+
+    lod = textureQueryLod(samp1Ds, pf);
+    lod = textureQueryLod(samp2Ds, pf2);
+    lod = textureQueryLod(sampCubes, pf3);
+    lod = textureQueryLod(samp1DAs, pf);
+    lod = textureQueryLod(samp2DAs, pf2);
+    lod = textureQueryLod(sampCubeAs, pf3);
+
+    lod = textureQueryLod(sampBuf, pf);     // ERROR
+    lod = textureQueryLod(sampRect, pf2);   // ERROR
+}