mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-02 01:04:54 +00:00
53 lines
2.0 KiB
C++
53 lines
2.0 KiB
C++
//
|
|
// CRTContants.hpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 19/03/2016.
|
|
// Copyright © 2016 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#ifndef CRTConstants_h
|
|
#define CRTConstants_h
|
|
|
|
#include "OpenGL.hpp"
|
|
#include <cstddef>
|
|
|
|
namespace Outputs {
|
|
namespace CRT {
|
|
|
|
// Output vertices are those used to copy from an input buffer — whether it describes data that maps directly to RGB
|
|
// or is one of the intermediate buffers that we've used to convert from composite towards RGB.
|
|
const GLsizei OutputVertexOffsetOfHorizontal = 0;
|
|
const GLsizei OutputVertexOffsetOfVertical = 4;
|
|
|
|
const GLsizei OutputVertexSize = 8;
|
|
|
|
// Input vertices, used only in composite mode, map from the input buffer to temporary buffer locations; such
|
|
// remapping occurs to ensure a continous stream of data for each scan, giving correct out-of-bounds behaviour
|
|
const GLsizei SourceVertexOffsetOfInputStart = 0;
|
|
const GLsizei SourceVertexOffsetOfOutputStart = 4;
|
|
const GLsizei SourceVertexOffsetOfEnds = 8;
|
|
const GLsizei SourceVertexOffsetOfPhaseTimeAndAmplitude = 12;
|
|
|
|
const GLsizei SourceVertexSize = 16;
|
|
|
|
// These constants hold the size of the rolling buffer to which the CPU writes
|
|
const GLsizei InputBufferBuilderWidth = 2048;
|
|
const GLsizei InputBufferBuilderHeight = 512;
|
|
|
|
// This is the size of the intermediate buffers used during composite to RGB conversion
|
|
const GLsizei IntermediateBufferWidth = 2048;
|
|
const GLsizei IntermediateBufferHeight = 512;
|
|
|
|
// Some internal buffer sizes
|
|
const GLsizeiptr OutputVertexBufferDataSize = OutputVertexSize * IntermediateBufferHeight; // i.e. the maximum number of scans of output that can be created between draws
|
|
const GLsizeiptr SourceVertexBufferDataSize = SourceVertexSize * IntermediateBufferHeight * 10; // (the maximum number of scans) * conservative, high guess at a maximumum number of events likely to occur within a scan
|
|
|
|
// TODO: when SourceVertexBufferDataSize is exhausted, the CRT keeps filling OutputVertexBufferDataSize regardless,
|
|
// leading to empty scanlines that nevertheless clear old contents.
|
|
|
|
}
|
|
}
|
|
|
|
#endif /* CRTContants_h */
|