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