mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-06 12:07:57 +00:00
64 lines
1.6 KiB
C++
64 lines
1.6 KiB
C++
//
|
|
// CRTInputBufferBuilder.hpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 08/03/2016.
|
|
// Copyright © 2016 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#ifndef CRTInputBufferBuilder_hpp
|
|
#define CRTInputBufferBuilder_hpp
|
|
|
|
#include <stdint.h>
|
|
#include <stdarg.h>
|
|
#include <stddef.h>
|
|
#include "CRTConstants.hpp"
|
|
#include "OpenGL.hpp"
|
|
|
|
namespace Outputs {
|
|
namespace CRT {
|
|
|
|
struct CRTInputBufferBuilder {
|
|
CRTInputBufferBuilder(size_t bytes_per_pixel);
|
|
~CRTInputBufferBuilder();
|
|
|
|
void allocate_write_area(size_t required_length);
|
|
void reduce_previous_allocation_to(size_t actual_length, uint8_t *buffer);
|
|
|
|
// a pointer to the section of content buffer currently being
|
|
// returned and to where the next section will begin
|
|
uint16_t _next_write_x_position, _next_write_y_position;
|
|
uint16_t _write_x_position, _write_y_position;
|
|
size_t _write_target_pointer;
|
|
size_t _last_allocation_amount;
|
|
size_t bytes_per_pixel;
|
|
|
|
// Storage for the amount of buffer uploaded so far; initialised correctly by the buffer
|
|
// builder but otherwise entrusted to the CRT to update.
|
|
unsigned int last_uploaded_line;
|
|
|
|
GLsync _wraparound_sync;
|
|
|
|
inline void move_to_new_line()
|
|
{
|
|
_next_write_x_position = 0;
|
|
_next_write_y_position = (_next_write_y_position+1)%InputBufferBuilderHeight;
|
|
// if(!_next_write_y_position)
|
|
// {
|
|
// glClientWaitSync(_wraparound_sync, 0, ~(GLuint64)0);
|
|
// glDeleteSync(_wraparound_sync);
|
|
// _wraparound_sync = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
|
|
// }
|
|
}
|
|
|
|
inline uint8_t *get_write_target(uint8_t *buffer)
|
|
{
|
|
return &buffer[_write_target_pointer * bytes_per_pixel];
|
|
}
|
|
};
|
|
|
|
}
|
|
}
|
|
|
|
#endif /* CRTInputBufferBuilder_hpp */
|