// 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_CLAMP_FRAG_DEPTH_H_ #define SRC_TINT_TRANSFORM_CLAMP_FRAG_DEPTH_H_ #include "src/tint/transform/transform.h" // Forward declarations namespace tint { class CloneContext; } // namespace tint namespace tint::transform { /// Add clamping of the `@builtin(frag_depth)` output of fragment shaders using two push constants /// provided by the outside environment. For example the following code: /// /// ``` /// @fragment fn main() -> @builtin(frag_depth) f32 { /// return 0.0; /// } /// ``` /// /// Is transformed to: /// /// ``` /// enable chromium_experimental_push_constant; /// /// struct FragDepthClampArgs { /// min : f32, /// max : f32, /// } /// /// var frag_depth_clamp_args : FragDepthClampArgs; /// /// fn clamp_frag_depth(v : f32) -> f32 { /// return clamp(v, frag_depth_clamp_args.min, frag_depth_clamp_args.max); /// } /// /// @fragment /// fn main() -> @builtin(frag_depth) f32 { /// return clamp_frag_depth(0.0); /// } /// ``` class ClampFragDepth final : public Castable { public: /// Constructor ClampFragDepth(); /// Destructor ~ClampFragDepth() 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_CLAMP_FRAG_DEPTH_H_