Shader_IR: Implement Injectable Custom Variables to the IR.

src/video_core/renderer_opengl/gl_shader_decompiler.cpp

@@ -391,6 +391,7 @@ public:
         DeclareVertex();
         DeclareGeometry();
         DeclareRegisters();
+        DeclareCustomVariables();
         DeclarePredicates();
         DeclareLocalMemory();
         DeclareInternalFlags();
@@ -503,6 +504,16 @@ private:
         }
     }
 
+    void DeclareCustomVariables() {
+        const u32 cv_num = ir.GetCustomVariablesAmount();
+        for (u32 i = 0; i < cv_num; ++i) {
+            code.AddLine("float {} = 0.0f;", GetCustomVariable(i));
+        }
+        if (cv_num > 0) {
+            code.AddNewLine();
+        }
+    }
+
     void DeclarePredicates() {
         const auto& predicates = ir.GetPredicates();
         for (const auto pred : predicates) {
@@ -780,6 +791,11 @@ private:
             return {GetRegister(index), Type::Float};
         }
 
+        if (const auto cv = std::get_if<CustomVarNode>(&*node)) {
+            const u32 index = cv->GetIndex();
+            return {GetCustomVariable(index), Type::Float};
+        }
+
         if (const auto immediate = std::get_if<ImmediateNode>(&*node)) {
             const u32 value = immediate->GetValue();
             if (value < 10) {
@@ -2250,6 +2266,10 @@ private:
         return GetDeclarationWithSuffix(index, "gpr");
     }
 
+    std::string GetCustomVariable(u32 index) const {
+        return GetDeclarationWithSuffix(index, "custom_var");
+    }
+
     std::string GetPredicate(Tegra::Shader::Pred pred) const {
         return GetDeclarationWithSuffix(static_cast<u32>(pred), "pred");
     }