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58 lines
1.4 KiB
C++
58 lines
1.4 KiB
C++
//
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// CRTInputBufferBuilder.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 08/03/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#ifndef CRTInputBufferBuilder_hpp
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#define CRTInputBufferBuilder_hpp
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#include <stdint.h>
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#include <stdarg.h>
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#include <stddef.h>
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#include "CRTConstants.hpp"
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#include "OpenGL.hpp"
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namespace Outputs {
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namespace CRT {
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struct CRTInputBufferBuilder {
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CRTInputBufferBuilder(size_t bytes_per_pixel);
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~CRTInputBufferBuilder();
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void allocate_write_area(size_t required_length);
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void reduce_previous_allocation_to(size_t actual_length, uint8_t *buffer);
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// a pointer to the section of content buffer currently being
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// returned and to where the next section will begin
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uint16_t _next_write_x_position, _next_write_y_position;
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uint16_t _write_x_position, _write_y_position;
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size_t _write_target_pointer;
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size_t _last_allocation_amount;
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size_t bytes_per_pixel;
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// Storage for the amount of buffer uploaded so far; initialised correctly by the buffer
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// builder but otherwise entrusted to the CRT to update.
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unsigned int last_uploaded_line;
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GLsync _wraparound_sync;
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inline void move_to_new_line()
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{
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_next_write_x_position = 0;
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_next_write_y_position = (_next_write_y_position+1)%InputBufferBuilderHeight;
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}
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inline uint8_t *get_write_target(uint8_t *buffer)
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{
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return &buffer[_write_target_pointer * bytes_per_pixel];
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}
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};
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}
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}
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#endif /* CRTInputBufferBuilder_hpp */
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