//
//  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 size_t OutputVertexOffsetOfPosition = 0;
const size_t OutputVertexOffsetOfTexCoord = 4;
const size_t OutputVertexOffsetOfTimestamp = 8;
const size_t OutputVertexOffsetOfLateral = 12;

const size_t OutputVertexSize = 16;

// 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 size_t InputVertexOffsetOfInputPosition = 0;
const size_t InputVertexOffsetOfOutputPosition = 4;
const size_t InputVertexOffsetOfPhaseAndAmplitude = 8;
const size_t InputVertexOffsetOfPhaseTime = 12;

const size_t InputVertexSize = 16;

// These constants hold the size of the rolling buffer to which the CPU writes
const int InputBufferBuilderWidth = 2048;
const int InputBufferBuilderHeight = 1024;

// This is the size of the intermediate buffers used during composite to RGB conversion
const int IntermediateBufferWidth = 2048;
const int IntermediateBufferHeight = 2048;

// Some internal
const GLsizeiptr InputVertexBufferDataSize = 262080;	// a multiple of 6 * OutputVertexSize


// Runs are divided discretely by vertical syncs in order to put a usable bounds on the uniform used to track
// run age; that therefore creates a discrete number of fields that are stored. This number should be the
// number of historic fields that are required fully to 
const int NumberOfFields = 3;

}
}

#endif /* CRTContants_h */