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123 lines
2.8 KiB
C++
123 lines
2.8 KiB
C++
//
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// ArrayBuilder.cpp
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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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#include "ArrayBuilder.hpp"
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using namespace Outputs::CRT;
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ArrayBuilder::ArrayBuilder(size_t input_size, size_t output_size) :
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output_(output_size),
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input_(input_size)
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{}
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ArrayBuilder::Buffer::Buffer(size_t size) :
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allocated_data(0), completed_data(0)
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{
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glGenBuffers(1, &buffer);
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glBindBuffer(GL_ARRAY_BUFFER, buffer);
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glBufferData(GL_ARRAY_BUFFER, (GLsizeiptr)size, NULL, GL_STREAM_DRAW);
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data.resize(size);
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}
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ArrayBuilder::Buffer::~Buffer()
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{
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glDeleteBuffers(1, &buffer);
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}
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uint8_t *ArrayBuilder::get_input_storage(size_t size)
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{
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return input_.get_storage(size);
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}
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uint8_t *ArrayBuilder::get_output_storage(size_t size)
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{
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return output_.get_storage(size);
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}
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void ArrayBuilder::flush()
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{
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// TODO: don't flush anything if either buffer was exhausted
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buffer_mutex_.lock();
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input_.flush();
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output_.flush();
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buffer_mutex_.unlock();
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}
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void ArrayBuilder::bind_input()
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{
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input_.bind();
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}
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void ArrayBuilder::bind_output()
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{
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output_.bind();
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}
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ArrayBuilder::Submission ArrayBuilder::submit()
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{
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ArrayBuilder::Submission submission;
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buffer_mutex_.lock();
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submission.input_size = input_.submit();
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submission.output_size = output_.submit();
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buffer_mutex_.unlock();
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// TODO: if either buffer was exhausted, reset both
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return submission;
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}
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uint8_t *ArrayBuilder::Buffer::get_storage(size_t size)
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{
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if(allocated_data + size > data.size()) return nullptr;
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uint8_t *pointer = &data[allocated_data];
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vended_pointer = allocated_data;
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allocated_data += size;
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return pointer;
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}
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void ArrayBuilder::Buffer::flush()
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{
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// Ordinarily this just requires the completed data count to be bumped up
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// to the current allocated data value. However if the amount of allocated
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// data is now less than the completed data then that implies a submission
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// occurred while the pointer previously vended by get_storage was in use.
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// So copy whatever is danging back to the start and make amends.
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if(completed_data < allocated_data)
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completed_data = allocated_data;
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else
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{
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completed_data = allocated_data - vended_pointer;
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allocated_data = completed_data;
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memcpy(data.data(), &data[vended_pointer], completed_data);
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}
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}
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size_t ArrayBuilder::Buffer::submit()
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{
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size_t length = completed_data;
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glBindBuffer(GL_ARRAY_BUFFER, buffer);
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uint8_t *destination = (uint8_t *)glMapBufferRange(GL_ARRAY_BUFFER, 0, (GLsizeiptr)length, GL_MAP_WRITE_BIT | GL_MAP_UNSYNCHRONIZED_BIT | GL_MAP_FLUSH_EXPLICIT_BIT);
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memcpy(destination, data.data(), length);
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glFlushMappedBufferRange(GL_ARRAY_BUFFER, 0, (GLsizeiptr)length);
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glUnmapBuffer(GL_ARRAY_BUFFER);
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completed_data = 0;
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return length;
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}
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void ArrayBuilder::Buffer::bind()
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{
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glBindBuffer(GL_ARRAY_BUFFER, buffer);
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}
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void ArrayBuilder::Buffer::reset()
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{
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completed_data = allocated_data = 0;
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}
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