blob: 49e663daf0e339d75bc31d0882557c0577800843 [file] [log] [blame] [edit]
// 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.
// You may obtain a copy of the License at
//
// 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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef SRC_TINT_TRANSFORM_STD140_H_
#define SRC_TINT_TRANSFORM_STD140_H_
#include "src/tint/transform/transform.h"
namespace tint::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. 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>` 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::transform
#endif // SRC_TINT_TRANSFORM_STD140_H_