#pragma once

#pragma bss_seg(".syncbss")
static ID3D11Buffer* SyncBuffer;
static SyncStruct_audio* Sync;

#pragma data_seg(".syncBufferDesc")
static D3D11_BUFFER_DESC syncBufferDesc =
{
	sizeof(SyncStruct_audio),
	D3D11_USAGE_DEFAULT,
	D3D11_BIND_CONSTANT_BUFFER,
	0,
	0,
	0
};

#pragma code_seg(".SyncInit")
INLINE void SyncInit()
{
	device->CreateBuffer(&syncBufferDesc, nullptr, &SyncBuffer);
	Sync = (SyncStruct_audio*)(syncDataAudio + 1);
}

#pragma code_seg(".SyncUpdate")
INLINE void SyncUpdate(float t)
{
	auto fRow = (t * SOUND_TICKS_PER_SCENE);
	auto iChannelCount = syncDataAudio[0];
	auto pTarget = (float*)&syncDataAudio[1];
	auto pChannels = (char*)(pTarget + iChannelCount);
	for (int iChannel = 0; iChannel < iChannelCount; ++iChannel)
	{
		auto iValueCount = *(unsigned short*)(pChannels);
		auto pChannelRows = (unsigned short*)(pChannels + 2);
		auto pChannelModes = (char*)(pChannelRows + iValueCount);
		auto pChannelValues = (float*)(pChannelModes + iValueCount);
		pChannels = (char*)(pChannelValues + iValueCount);
		for (int iIndex = 0; iIndex < iValueCount;)
		{
			int iRow = pChannelRows[iIndex];
			int iNextRow = pChannelRows[iIndex + 1];
			if (iRow <= fRow && iNextRow + 1 > fRow)
			{
				float t = (fRow - iRow) / (iNextRow - iRow + 1);
				switch (pChannelModes[iIndex])
				{
				case 0: // Step
					t = 0.0f;
					break;
				case 1: // Linear
					break;
				case 2: // Cubic
					t *= t * (3 - 2 * t);
					break;
				case 3: // EaseIn
					t *= t;
					break;
				case 4: // EaseOut
					t *= -t + 2;
					break;
				}
				pTarget[iChannel] = (1 - t) * pChannelValues[iIndex] + t * pChannelValues[iIndex + 1];
				break;
			}
			else
			{
				if (pChannelModes[iIndex] != 0)
					++iIndex;

				pTarget[iChannel] = pChannelValues[iIndex];

				++iIndex;
			}
		}
	}

#ifdef AUTHORING
	Sync = (SyncStruct_audio*)pTarget;
	if (SyncBuffer != NULL)
		SyncBuffer->Release();

	syncBufferDesc.ByteWidth = iChannelCount * sizeof(float);
	device->CreateBuffer(&syncBufferDesc, nullptr, &SyncBuffer);

	if (iChannelCount != 0)
#endif

	context->UpdateSubresource(SyncBuffer, 0, NULL, pTarget, iChannelCount * sizeof(float), sizeof(float));
}