src/tint/lang/wgsl/ast/transform/var_for_dynamic_index.h

// Copyright 2022 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
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//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
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#ifndef SRC_TINT_LANG_WGSL_AST_TRANSFORM_VAR_FOR_DYNAMIC_INDEX_H_
#define SRC_TINT_LANG_WGSL_AST_TRANSFORM_VAR_FOR_DYNAMIC_INDEX_H_

#include "src/tint/lang/wgsl/ast/transform/transform.h"

namespace tint::ast::transform {

/// A transform that extracts array and matrix values that are dynamically
/// indexed to a temporary `var` local before performing the index. This
/// transform is used by the SPIR-V writer as there is no SPIR-V instruction
/// that can dynamically index a non-pointer composite.
class VarForDynamicIndex final : public Castable<VarForDynamicIndex, Transform> {
  public:
    /// Constructor
    VarForDynamicIndex();

    /// Destructor
    ~VarForDynamicIndex() override;

    /// @copydoc Transform::Apply
    ApplyResult Apply(const Program* program,
                      const DataMap& inputs,
                      DataMap& outputs) const override;
};

}  // namespace tint::ast::transform

#endif  // SRC_TINT_LANG_WGSL_AST_TRANSFORM_VAR_FOR_DYNAMIC_INDEX_H_