Add an option to set the base uniform location

This will be used to generate uniform locations with --aml

glslang/MachineIndependent/ShaderLang.cpp

@@ -1763,6 +1763,10 @@ void TShader::addUniformLocationOverride(const char* name, int loc)
 {
     intermediate->addUniformLocationOverride(name, loc);
 }
+void TShader::setUniformLocationBase(int base)
+{
+    intermediate->setUniformLocationBase(base);
+}
 // See comment above TDefaultHlslIoMapper in iomapper.cpp:
 void TShader::setHlslIoMapping(bool hlslIoMap)          { intermediate->setHlslIoMapping(hlslIoMap); }
 void TShader::setFlattenUniformArrays(bool flatten)     { intermediate->setFlattenUniformArrays(flatten); }

glslang/MachineIndependent/iomapper.cpp

@@ -359,7 +359,7 @@ struct TDefaultIoResolverBase : public glslang::TIoMapResolver
 {
     TDefaultIoResolverBase(const TIntermediate &intermediate) :
         intermediate(intermediate),
-        nextUniformLocation(0),
+        nextUniformLocation(intermediate.getUniformLocationBase()),
         nextInputLocation(0),
         nextOutputLocation(0)
     { }

glslang/MachineIndependent/localintermediate.h

@@ -252,7 +252,8 @@ public:
         hlslIoMapping(false),
         textureSamplerTransformMode(EShTexSampTransKeep),
         needToLegalize(false),
-        binaryDoubleOutput(false)
+        binaryDoubleOutput(false),
+        uniformLocationBase(0)
     {
         localSize[0] = 1;
         localSize[1] = 1;
@@ -685,6 +686,9 @@ public:
                     return pos->second;
     }
 
+    void setUniformLocationBase(int base) { uniformLocationBase = base; }
+    int getUniformLocationBase() const { return uniformLocationBase; }
+
     void setNeedsLegalization() { needToLegalize = true; }
     bool needsLegalization() const { return needToLegalize; }
 
@@ -811,6 +815,7 @@ protected:
     bool binaryDoubleOutput;
 
     std::unordered_map<TString, int> uniformLocationOverrides;
+    int uniformLocationBase;
 
 private:
     void operator=(TIntermediate&); // prevent assignments