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// Copyright 2022 The Dawn & Tint Authors
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#ifndef SRC_TINT_LANG_WGSL_AST_TRANSFORM_STD140_H_
#define SRC_TINT_LANG_WGSL_AST_TRANSFORM_STD140_H_
#include "src/tint/lang/wgsl/ast/transform/transform.h"
namespace tint::ast::transform {
/// Std140 is a transform that forks types used in the uniform address space that contain
/// `matNx2<f32>` matrices into `N`x`vec2<f32>` column vectors, and `matNxM<f16>` matrices into
/// `N`x`vecM<f16>` column vectors. Types that transitively use these forked types are also forked.
/// `var<uniform>` variables will use these forked types, and expressions loading from these
/// variables will do appropriate conversions to the regular WGSL types. As `matNx2<f32>` and
/// `matNxM<f16>` matrices are the only type that violate std140-layout, this transformation is
/// sufficient to have any WGSL structure be std140-layout conformant.
///
/// @note This transform requires the PromoteSideEffectsToDecl transform to have been run first.
class Std140 final : public Castable<Std140, Transform> {
public:
/// Constructor
Std140();
/// Destructor
~Std140() override;
/// @copydoc Transform::Apply
ApplyResult Apply(const Program& program,
const DataMap& inputs,
DataMap& outputs) const override;
private:
struct State;
};
} // namespace tint::ast::transform
#endif // SRC_TINT_LANG_WGSL_AST_TRANSFORM_STD140_H_