blob: 5bcd3ead7e0e1daba0b5db57fbd3e566e7b2c580 [file] [log] [blame]
// 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"
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> {
public:
/// Constructor
ClampFragDepth();
/// Destructor
~ClampFragDepth() override;
/// @copydoc ast::transform::Transform::Apply
ApplyResult Apply(const Program& program,
const ast::transform::DataMap& inputs,
ast::transform::DataMap& outputs) const override;
private:
struct State;
};
} // namespace tint::ast::transform
#endif // SRC_TINT_LANG_WGSL_AST_TRANSFORM_CLAMP_FRAG_DEPTH_H_