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4d3ff9711e
This CL makes the builtin argument resolve as a shadowable enumerator expression. Bug: tint:1841 Bug: tint:1845 Change-Id: I2aaa2c63025752f25c113cf2fb38f4d91c2c16c2 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/120680 Kokoro: Ben Clayton <bclayton@google.com> Reviewed-by: Dan Sinclair <dsinclair@chromium.org> Commit-Queue: Ben Clayton <bclayton@google.com> Reviewed-by: James Price <jrprice@google.com>
76 lines
2.1 KiB
C++
76 lines
2.1 KiB
C++
// Copyright 2022 The Tint Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SRC_TINT_TRANSFORM_CLAMP_FRAG_DEPTH_H_
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#define SRC_TINT_TRANSFORM_CLAMP_FRAG_DEPTH_H_
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#include "src/tint/transform/transform.h"
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// Forward declarations
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namespace tint {
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class CloneContext;
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} // namespace tint
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namespace tint::transform {
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/// Add clamping of the `@builtin(frag_depth)` output of fragment shaders using two push constants
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/// provided by the outside environment. For example the following code:
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///
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/// ```
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/// @fragment fn main() -> @builtin(frag_depth) f32 {
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/// return 0.0;
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/// }
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/// ```
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///
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/// Is transformed to:
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///
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/// ```
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/// enable chromium_experimental_push_constant;
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///
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/// struct FragDepthClampArgs {
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/// min : f32,
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/// max : f32,
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/// }
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///
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/// var<push_constant> frag_depth_clamp_args : FragDepthClampArgs;
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///
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/// fn clamp_frag_depth(v : f32) -> f32 {
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/// return clamp(v, frag_depth_clamp_args.min, frag_depth_clamp_args.max);
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/// }
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///
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/// @fragment
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/// fn main() -> @builtin(frag_depth) f32 {
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/// return clamp_frag_depth(0.0);
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/// }
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/// ```
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class ClampFragDepth final : public Castable<ClampFragDepth, Transform> {
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public:
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/// Constructor
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ClampFragDepth();
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/// Destructor
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~ClampFragDepth() override;
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/// @copydoc Transform::Apply
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ApplyResult Apply(const Program* program,
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const DataMap& inputs,
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DataMap& outputs) const override;
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private:
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struct State;
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};
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} // namespace tint::transform
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#endif // SRC_TINT_TRANSFORM_CLAMP_FRAG_DEPTH_H_
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