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// Copyright 2019 The Amber 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.
#ifndef SRC_TYPE_PARSER_H_
#define SRC_TYPE_PARSER_H_
#include <memory>
#include <string>
#include <vector>
#include "src/type.h"
namespace amber {
/// Parses a Vulkan image string into a type object.
class TypeParser {
public:
static FormatType NameToFormatType(const std::string& data);
TypeParser();
~TypeParser();
/// Parses the |fmt| string and returns the associated type, nullptr if the
/// conversion is not possible.
///
/// The format string can come in two different forms, it can be a vulkan
/// style format string (e.g. R32G32B32A32_SFLOAT) or it can be in the type
/// format (gl_type/glsl_type) specified by VkScript (e.g. byte/vec4).
std::unique_ptr<type::Type> Parse(const std::string& fmt);
private:
std::unique_ptr<type::Type> ParseGlslFormat(const std::string& fmt);
bool ProcessChunk(const std::string&);
void AddPiece(FormatComponentType type, FormatMode mode, uint8_t bits);
void FlushPieces(type::Type* type, FormatMode mode);
struct Pieces {
Pieces(FormatComponentType t, FormatMode m, uint8_t bits)
: type(t), mode(m), num_bits(bits) {}
FormatComponentType type;
FormatMode mode;
uint8_t num_bits;
};
FormatMode mode_ = FormatMode::kSInt;
uint32_t pack_size_ = 0;
std::vector<Pieces> pieces_;
};
} // namespace amber
#endif // SRC_TYPE_PARSER_H_
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