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102 lines
3.6 KiB
C++
102 lines
3.6 KiB
C++
//
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// ArrayBuilder.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 17/11/2016.
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// Copyright 2016 Thomas Harte. All rights reserved.
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//
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#ifndef ArrayBuilder_hpp
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#define ArrayBuilder_hpp
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#include <functional>
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#include <memory>
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#include <vector>
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#include "OpenGL.hpp"
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namespace Outputs {
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namespace CRT {
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/*!
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Owns two array buffers, an 'input' and an 'output' and vends pointers to allow an owner to write provisional data into those
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plus a flush function to lock provisional data into place. Also supplies a submit method to transfer all currently locked
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data to the GPU and bind_input/output methods to bind the internal buffers.
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It is safe for one thread to communicate via the get_*_storage and flush inputs asynchronously from another that is making
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use of the bind and submit outputs.
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*/
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class ArrayBuilder {
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public:
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/// Creates an instance of ArrayBuilder with @c output_size bytes of storage for the output buffer and
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/// @c input_size bytes of storage for the input buffer.
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ArrayBuilder(std::size_t input_size, std::size_t output_size);
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/// Creates an instance of ArrayBuilder with @c output_size bytes of storage for the output buffer and
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/// @c input_size bytes of storage for the input buffer that, rather than using OpenGL, will submit data
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/// to the @c submission_function. [Teleological: this is provided as a testing hook.]
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ArrayBuilder(std::size_t input_size, std::size_t output_size, std::function<void(bool is_input, uint8_t *, std::size_t)> submission_function);
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/// Attempts to add @c size bytes to the input set.
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/// @returns a pointer to the allocated area if allocation was possible; @c nullptr otherwise.
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uint8_t *get_input_storage(std::size_t size);
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/// Attempts to add @c size bytes to the output set.
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/// @returns a pointer to the allocated area if allocation was possible; @c nullptr otherwise.
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uint8_t *get_output_storage(std::size_t size);
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/// @returns @c true if either of the input or output storage areas is currently exhausted; @c false otherwise.
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bool is_full();
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/// If neither input nor output was exhausted since the last flush, atomically commits both input and output
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/// up to the currently allocated size for use upon the next @c submit, giving the supplied function a
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/// chance to perform last-minute processing. Otherwise acts as a no-op.
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void flush(const std::function<void(uint8_t *input, std::size_t input_size, uint8_t *output, std::size_t output_size)> &);
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/// Binds the input array to GL_ARRAY_BUFFER.
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void bind_input();
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/// Binds the output array to GL_ARRAY_BUFFER.
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void bind_output();
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struct Submission {
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std::size_t input_size, output_size;
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};
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/// Submits all flushed input and output data to the corresponding arrays.
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/// @returns A @c Submission record, indicating how much data of each type was submitted.
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Submission submit();
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private:
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class Buffer {
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public:
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Buffer(std::size_t size, std::function<void(bool is_input, uint8_t *, std::size_t)> submission_function);
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~Buffer();
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uint8_t *get_storage(std::size_t size);
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uint8_t *get_unflushed(std::size_t &size);
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void flush();
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std::size_t submit(bool is_input);
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void bind();
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void reset();
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private:
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bool is_full = false;
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GLuint buffer = 0;
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std::function<void(bool is_input, uint8_t *, std::size_t)> submission_function_;
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std::vector<uint8_t> data;
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std::size_t allocated_data = 0;
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std::size_t flushed_data = 0;
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std::size_t submitted_data = 0;
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} output_, input_;
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uint8_t *get_storage(std::size_t size, Buffer &buffer);
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bool is_full_ = false;
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};
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}
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}
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#endif /* ArrayBuilder_hpp */
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