Utils.cpp

#include "Utils.hpp"

void Utils::StartTimer()
{
	LARGE_INTEGER frequencyCount;
	QueryPerformanceFrequency(&frequencyCount);

	g_countsPerSecond = double(frequencyCount.QuadPart);

	QueryPerformanceCounter(&frequencyCount);
	g_counterStart = frequencyCount.QuadPart;
}

double Utils::GetTime()
{
	LARGE_INTEGER currentTime;
	QueryPerformanceCounter(&currentTime);
	return double(currentTime.QuadPart - g_counterStart) / g_countsPerSecond;
}

double Utils::GetFrameTime()
{
	LARGE_INTEGER currentTime;
	__int64 tickCount;
	QueryPerformanceCounter(&currentTime);

	tickCount = currentTime.QuadPart - g_frameTimeOld;
	g_frameTimeOld = currentTime.QuadPart;

	if (tickCount < 0.0f)
		tickCount = 0.0f;

	return float(tickCount) / g_countsPerSecond;
}

HRESULT Utils::CompileShaderFromFile(LPCWSTR szFileName, LPCSTR szEntryPoint, LPCSTR szShaderModel, ID3DBlob** ppBlobOut)
{
	HRESULT hr;
	DWORD dwShaderFlags = D3DCOMPILE_ENABLE_STRICTNESS;

	hr = D3DCompileFromFile(szFileName, NULL, NULL, szEntryPoint, szShaderModel,
		dwShaderFlags, 0, ppBlobOut, NULL);

	if (FAILED(hr))
		printf("Error: cannot compile shader\n");

	return hr;
}