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dawn-cmake/generator/templates/api_cpp.h

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//* Copyright 2017 The Dawn Authors
//*
//* Licensed under the Apache License, Version 2.0 (the "License");
//* you may not use this file except in compliance with the License.
//* You may obtain a copy of the License at
//*
//* http://www.apache.org/licenses/LICENSE-2.0
//*
//* Unless required by applicable law or agreed to in writing, software
//* distributed under the License is distributed on an "AS IS" BASIS,
//* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//* See the License for the specific language governing permissions and
//* limitations under the License.
{% set API = metadata.api.upper() %}
{% set api = API.lower() %}
{% if 'dawn' not in enabled_tags %}
#ifdef __EMSCRIPTEN__
#error "Do not include this header. Emscripten already provides headers needed for {{metadata.api}}."
#endif
{% endif %}
#ifndef {{API}}_CPP_H_
#define {{API}}_CPP_H_
#include "dawn/{{api}}.h"
#include "dawn/EnumClassBitmasks.h"
#include <cmath>
namespace {{metadata.namespace}} {
namespace detail {
constexpr size_t ConstexprMax(size_t a, size_t b) {
return a > b ? a : b;
}
} // namespace detail
{% set c_prefix = metadata.c_prefix %}
{% for constant in by_category["constant"] %}
{% set type = as_cppType(constant.type.name) %}
{% set value = c_prefix + "_" + constant.name.SNAKE_CASE() %}
static constexpr {{type}} k{{as_cppType(constant.name)}} = {{ value }};
{% endfor %}
{% for type in by_category["enum"] %}
enum class {{as_cppType(type.name)}} : uint32_t {
{% for value in type.values %}
{{as_cppEnum(value.name)}} = 0x{{format(value.value, "08X")}},
{% endfor %}
};
{% endfor %}
{% for type in by_category["bitmask"] %}
enum class {{as_cppType(type.name)}} : uint32_t {
{% for value in type.values %}
{{as_cppEnum(value.name)}} = 0x{{format(value.value, "08X")}},
{% endfor %}
};
{% endfor %}
{% for type in by_category["function pointer"] %}
using {{as_cppType(type.name)}} = {{as_cType(type.name)}};
{% endfor %}
{% for type in by_category["object"] %}
class {{as_cppType(type.name)}};
{% endfor %}
{% for type in by_category["structure"] %}
struct {{as_cppType(type.name)}};
{% endfor %}
{% for typeDef in by_category["typedef"] %}
// {{as_cppType(typeDef.name)}} is deprecated.
// Use {{as_cppType(typeDef.type.name)}} instead.
using {{as_cppType(typeDef.name)}} = {{as_cppType(typeDef.type.name)}};
{% endfor %}
template<typename Derived, typename CType>
class ObjectBase {
public:
ObjectBase() = default;
ObjectBase(CType handle): mHandle(handle) {
if (mHandle) Derived::{{c_prefix}}Reference(mHandle);
}
~ObjectBase() {
if (mHandle) Derived::{{c_prefix}}Release(mHandle);
}
ObjectBase(ObjectBase const& other)
: ObjectBase(other.Get()) {
}
Derived& operator=(ObjectBase const& other) {
if (&other != this) {
if (mHandle) Derived::{{c_prefix}}Release(mHandle);
mHandle = other.mHandle;
if (mHandle) Derived::{{c_prefix}}Reference(mHandle);
}
return static_cast<Derived&>(*this);
}
ObjectBase(ObjectBase&& other) {
mHandle = other.mHandle;
other.mHandle = 0;
}
Derived& operator=(ObjectBase&& other) {
if (&other != this) {
if (mHandle) Derived::{{c_prefix}}Release(mHandle);
mHandle = other.mHandle;
other.mHandle = 0;
}
return static_cast<Derived&>(*this);
}
ObjectBase(std::nullptr_t) {}
Derived& operator=(std::nullptr_t) {
if (mHandle != nullptr) {
Derived::{{c_prefix}}Release(mHandle);
mHandle = nullptr;
}
return static_cast<Derived&>(*this);
}
bool operator==(std::nullptr_t) const {
return mHandle == nullptr;
}
bool operator!=(std::nullptr_t) const {
return mHandle != nullptr;
}
explicit operator bool() const {
return mHandle != nullptr;
}
CType Get() const {
return mHandle;
}
CType Release() {
CType result = mHandle;
mHandle = 0;
return result;
}
static Derived Acquire(CType handle) {
Derived result;
result.mHandle = handle;
return result;
}
protected:
CType mHandle = nullptr;
};
{% macro render_cpp_default_value(member, is_struct=True) -%}
{%- if member.json_data.get("no_default", false) -%}
{%- elif member.annotation in ["*", "const*"] and member.optional or member.default_value == "nullptr" -%}
{{" "}}= nullptr
{%- elif member.type.category == "object" and member.optional and is_struct -%}
{{" "}}= nullptr
{%- elif member.type.category in ["enum", "bitmask"] and member.default_value != None -%}
{{" "}}= {{as_cppType(member.type.name)}}::{{as_cppEnum(Name(member.default_value))}}
{%- elif member.type.category == "native" and member.default_value != None -%}
{{" "}}= {{member.default_value}}
{%- elif member.default_value != None -%}
{{" "}}= {{member.default_value}}
{%- else -%}
{{assert(member.default_value == None)}}
{%- endif -%}
{%- endmacro %}
{% macro render_cpp_method_declaration(type, method) %}
{% set CppType = as_cppType(type.name) %}
{{as_cppType(method.return_type.name)}} {{method.name.CamelCase()}}(
{%- for arg in method.arguments -%}
{%- if not loop.first %}, {% endif -%}
{%- if arg.type.category == "object" and arg.annotation == "value" -%}
{{as_cppType(arg.type.name)}} const& {{as_varName(arg.name)}}
{%- else -%}
{{as_annotated_cppType(arg)}}
{%- endif -%}
{{render_cpp_default_value(arg, False)}}
{%- endfor -%}
) const
{%- endmacro %}
{% for type in by_category["object"] %}
{% set CppType = as_cppType(type.name) %}
{% set CType = as_cType(type.name) %}
class {{CppType}} : public ObjectBase<{{CppType}}, {{CType}}> {
public:
using ObjectBase::ObjectBase;
using ObjectBase::operator=;
{% for method in type.methods %}
{{render_cpp_method_declaration(type, method)}};
{% endfor %}
private:
friend ObjectBase<{{CppType}}, {{CType}}>;
static void {{c_prefix}}Reference({{CType}} handle);
static void {{c_prefix}}Release({{CType}} handle);
};
{% endfor %}
{% for function in by_category["function"] %}
{{as_cppType(function.return_type.name)}} {{as_cppType(function.name)}}(
{%- for arg in function.arguments -%}
{%- if not loop.first %}, {% endif -%}
{{as_annotated_cppType(arg)}}{{render_cpp_default_value(arg, False)}}
{%- endfor -%}
);
{% endfor %}
struct ChainedStruct {
ChainedStruct const * nextInChain = nullptr;
SType sType = SType::Invalid;
};
struct ChainedStructOut {
ChainedStruct * nextInChain = nullptr;
SType sType = SType::Invalid;
};
{% for type in by_category["structure"] %}
{% set Out = "Out" if type.output else "" %}
{% set const = "const" if not type.output else "" %}
{% if type.chained %}
{% for root in type.chain_roots %}
// Can be chained in {{as_cppType(root.name)}}
{% endfor %}
struct {{as_cppType(type.name)}} : ChainedStruct{{Out}} {
{{as_cppType(type.name)}}() {
sType = SType::{{type.name.CamelCase()}};
}
{% else %}
struct {{as_cppType(type.name)}} {
{% endif %}
{% if type.extensible %}
ChainedStruct{{Out}} {{const}} * nextInChain = nullptr;
{% endif %}
{% for member in type.members %}
{% set member_declaration = as_annotated_cppType(member) + render_cpp_default_value(member) %}
{% if type.chained and loop.first %}
//* Align the first member after ChainedStruct to match the C struct layout.
//* It has to be aligned both to its natural and ChainedStruct's alignment.
static constexpr size_t kFirstMemberAlignment = detail::ConstexprMax(alignof(ChainedStruct{{out}}), alignof({{decorate("", as_cppType(member.type.name), member)}}));
alignas(kFirstMemberAlignment) {{member_declaration}};
{% else %}
{{member_declaration}};
{% endif %}
{% endfor %}
};
{% endfor %}
// The operators of EnumClassBitmmasks in the dawn:: namespace need to be imported
// in the {{metadata.namespace}} namespace for Argument Dependent Lookup.
DAWN_IMPORT_BITMASK_OPERATORS
} // namespace {{metadata.namespace}}
namespace dawn {
{% for type in by_category["bitmask"] %}
template<>
struct IsDawnBitmask<{{metadata.namespace}}::{{as_cppType(type.name)}}> {
static constexpr bool enable = true;
};
{% endfor %}
} // namespace dawn
#endif // {{API}}_CPP_H_
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