Implement textureSize.

src/compiler/Initialize.cpp

@@ -22,6 +22,7 @@ void InsertBuiltInFunctions(ShShaderType type, ShShaderSpec spec, const ShBuiltI
     TType *float3 = new TType(EbtFloat, EbpUndefined, EvqGlobal, 3);
     TType *float4 = new TType(EbtFloat, EbpUndefined, EvqGlobal, 4);
 
+    TType *int1 = new TType(EbtInt, EbpUndefined, EvqGlobal, 1);
     TType *int2 = new TType(EbtInt, EbpUndefined, EvqGlobal, 2);
     TType *int3 = new TType(EbtInt, EbpUndefined, EvqGlobal, 3);
     TType *int4 = new TType(EbtInt, EbpUndefined, EvqGlobal, 4);
@@ -459,6 +460,19 @@ void InsertBuiltInFunctions(ShShaderType type, ShShaderSpec spec, const ShBuiltI
         symbolTable.insertBuiltIn(ESSL3_BUILTINS, uint4, "textureProj", usampler3D, "sampler", float4, "coord", float1, "bias");
     }
 
+    symbolTable.insertBuiltIn(ESSL3_BUILTINS, int2, "textureSize", sampler2D, "sampler", int1, "lod");
+    symbolTable.insertBuiltIn(ESSL3_BUILTINS, int2, "textureSize", isampler2D, "sampler", int1, "lod");
+    symbolTable.insertBuiltIn(ESSL3_BUILTINS, int2, "textureSize", usampler2D, "sampler", int1, "lod");
+    symbolTable.insertBuiltIn(ESSL3_BUILTINS, int3, "textureSize", sampler3D, "sampler", int1, "lod");
+    symbolTable.insertBuiltIn(ESSL3_BUILTINS, int3, "textureSize", isampler3D, "sampler", int1, "lod");
+    symbolTable.insertBuiltIn(ESSL3_BUILTINS, int3, "textureSize", usampler3D, "sampler", int1, "lod");
+    symbolTable.insertBuiltIn(ESSL3_BUILTINS, int2, "textureSize", samplerCube, "sampler", int1, "lod");
+    symbolTable.insertBuiltIn(ESSL3_BUILTINS, int2, "textureSize", isamplerCube, "sampler", int1, "lod");
+    symbolTable.insertBuiltIn(ESSL3_BUILTINS, int2, "textureSize", usamplerCube, "sampler", int1, "lod");
+    symbolTable.insertBuiltIn(ESSL3_BUILTINS, int3, "textureSize", sampler2DArray, "sampler", int1, "lod");
+    symbolTable.insertBuiltIn(ESSL3_BUILTINS, int3, "textureSize", isampler2DArray, "sampler", int1, "lod");
+    symbolTable.insertBuiltIn(ESSL3_BUILTINS, int3, "textureSize", usampler2DArray, "sampler", int1, "lod");
+
     if(type == SH_FRAGMENT_SHADER)
     {
         symbolTable.insertBuiltIn(ESSL3_BUILTINS, float1, "dFdx", float1, "p");

src/compiler/OutputHLSL.h

@@ -96,18 +96,19 @@ class OutputHLSL : public TIntermTraverser
 
     struct TextureFunction
     {
-        enum Mipmap
+        enum Method
         {
-            IMPLICIT,
+            IMPLICIT,   // Mipmap LOD determined implicitly (standard lookup)
             BIAS,
             LOD,
-            LOD0
+            LOD0,
+            SIZE   // textureSize()
         };
 
         TBasicType sampler;
         int coords;
         bool proj;
-        Mipmap mipmap;
+        Method method;
 
         TString name() const;