dawn-cmake/src/transform/emit_vertex_point_size.h

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// Copyright 2020 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_TRANSFORM_EMIT_VERTEX_POINT_SIZE_H_
#define SRC_TRANSFORM_EMIT_VERTEX_POINT_SIZE_H_
#include "src/transform/transform.h"
namespace tint {
namespace transform {
/// EmitVertexPointSize is a Transform that adds a PointSize builtin global
/// output variable to the module which is assigned 1.0 as the new first
/// statement for all vertex stage entry points.
/// If the module does not contain a vertex pipeline stage entry point then then
/// this transform is a no-op.
class EmitVertexPointSize : public Transform {
public:
/// Constructor
EmitVertexPointSize();
/// Destructor
~EmitVertexPointSize() override;
/// Runs the transform on `module`, returning the transformation result.
/// @note Users of Tint should register the transform with transform manager
/// and invoke its Run(), instead of directly calling the transform's Run().
/// Calling Run() directly does not perform module state cleanup operations.
/// @param module the source module to transform
/// @returns the transformation result
Output Run(ast::Module* module) override;
};
} // namespace transform
} // namespace tint
#endif // SRC_TRANSFORM_EMIT_VERTEX_POINT_SIZE_H_