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// Copyright 2023 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.
#include "src/tint/lang/spirv/writer/helpers/ast_generate_bindings.h"
#include <algorithm>
#include <unordered_map>
#include <unordered_set>
#include <vector>
#include "src/tint/api/common/binding_point.h"
#include "src/tint/lang/core/type/external_texture.h"
#include "src/tint/lang/core/type/storage_texture.h"
#include "src/tint/lang/wgsl/ast/module.h"
#include "src/tint/lang/wgsl/program/program.h"
#include "src/tint/lang/wgsl/sem/variable.h"
#include "src/tint/utils/containers/hashmap.h"
#include "src/tint/utils/containers/vector.h"
#include "src/tint/utils/rtti/switch.h"
namespace tint::spirv::writer {
Bindings GenerateBindings(const Program& program) {
// TODO(tint:1491): Use Inspector once we can get binding info for all
// variables, not just those referenced by entry points.
Bindings bindings{};
// Collect next valid binding number per group
Hashmap<uint32_t, uint32_t, 4> group_to_next_binding_number;
Vector<tint::BindingPoint, 4> ext_tex_bps;
for (auto* var : program.AST().GlobalVariables()) {
if (auto* sem_var = program.Sem().Get(var)->As<sem::GlobalVariable>()) {
if (auto bp = sem_var->Attributes().binding_point) {
if (auto val = group_to_next_binding_number.Get(bp->group)) {
*val = std::max(*val, bp->binding + 1);
} else {
group_to_next_binding_number.Add(bp->group, bp->binding + 1);
}
// Store up the external textures, we'll add them in the next step
if (sem_var->Type()->UnwrapRef()->Is<core::type::ExternalTexture>()) {
ext_tex_bps.Push(*bp);
continue;
}
binding::BindingInfo info{bp->group, bp->binding};
switch (sem_var->AddressSpace()) {
case core::AddressSpace::kHandle:
Switch(
sem_var->Type()->UnwrapRef(), //
[&](const core::type::Sampler*) {
bindings.sampler.emplace(*bp, info);
},
[&](const core::type::StorageTexture*) {
bindings.storage_texture.emplace(*bp, info);
},
[&](const core::type::Texture*) {
bindings.texture.emplace(*bp, info);
});
break;
case core::AddressSpace::kStorage:
bindings.storage.emplace(*bp, info);
break;
case core::AddressSpace::kUniform:
bindings.uniform.emplace(*bp, info);
break;
case core::AddressSpace::kUndefined:
case core::AddressSpace::kPixelLocal:
case core::AddressSpace::kPrivate:
case core::AddressSpace::kPushConstant:
case core::AddressSpace::kIn:
case core::AddressSpace::kOut:
case core::AddressSpace::kFunction:
case core::AddressSpace::kWorkgroup:
break;
}
}
}
}
for (auto bp : ext_tex_bps) {
uint32_t g = bp.group;
uint32_t& next_num = group_to_next_binding_number.GetOrAddZero(g);
binding::BindingInfo plane0{bp.group, bp.binding};
binding::BindingInfo plane1{g, next_num++};
binding::BindingInfo metadata{g, next_num++};
bindings.external_texture.emplace(bp, binding::ExternalTexture{metadata, plane0, plane1});
}
return bindings;
}
} // namespace tint::spirv::writer