// Copyright 2022 The Dawn & Tint Authors // // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are met: // // 1. Redistributions of source code must retain the above copyright notice, this // list of conditions and the following disclaimer. // // 2. Redistributions in binary form must reproduce the above copyright notice, // this list of conditions and the following disclaimer in the documentation // and/or other materials provided with the distribution. // // 3. Neither the name of the copyright holder nor the names of its // contributors may be used to endorse or promote products derived from // this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. #ifndef SRC_TINT_LANG_WGSL_AST_TRANSFORM_CLAMP_FRAG_DEPTH_H_ #define SRC_TINT_LANG_WGSL_AST_TRANSFORM_CLAMP_FRAG_DEPTH_H_ #include "src/tint/lang/wgsl/ast/transform/transform.h" #include "src/tint/utils/reflection/reflection.h" namespace tint::ast::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<push_constant> 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<ClampFragDepth, ast::transform::Transform> { … }; } // namespace tint::ast::transform #endif // SRC_TINT_LANG_WGSL_AST_TRANSFORM_CLAMP_FRAG_DEPTH_H_