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05d8b02b0f
Since GLSL ES does not support the offset= attribute, struct members with explicit @align or @size attributes require adding explicit padding members. This in turn requires rewriting any constructor calls to initialize the new padding to zero, handled in the same transform. Note that this is currently overly-verbose, and will add padding where GLSL doesn't technically need it (e.g., padding a vec3 out to 16 bytes). Bug: tint:1415 Change-Id: Ia9ba513066a0e84f4c43247fcbbe02f5fadd6630 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/101720 Reviewed-by: Ben Clayton <bclayton@google.com> Commit-Queue: Stephen White <senorblanco@chromium.org> Kokoro: Kokoro <noreply+kokoro@google.com>
46 lines
1.6 KiB
C++
46 lines
1.6 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_PAD_STRUCTS_H_
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#define SRC_TINT_TRANSFORM_PAD_STRUCTS_H_
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#include "src/tint/transform/transform.h"
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namespace tint::transform {
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/// This transform turns all explicit alignment and sizing into padding
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/// members of structs. This is required for GLSL ES, since it not support
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/// the offset= decoration.
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class PadStructs final : public Castable<PadStructs, Transform> {
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public:
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/// Constructor
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PadStructs();
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/// Destructor
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~PadStructs() override;
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protected:
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/// Runs the transform using the CloneContext built for transforming a
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/// program. Run() is responsible for calling Clone() on the CloneContext.
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/// @param ctx the CloneContext primed with the input program and
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/// ProgramBuilder
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/// @param inputs optional extra transform-specific input data
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/// @param outputs optional extra transform-specific output data
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void Run(CloneContext& ctx, const DataMap& inputs, DataMap& outputs) const override;
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};
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} // namespace tint::transform
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#endif // SRC_TINT_TRANSFORM_PAD_STRUCTS_H_
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