Method Jitter

trinity/Eve/EveSpaceScene.cpp:1250–1288

}

void EveSpaceScene::Jitter( Tr2RenderContext& renderContext )
{
	m_projection = Tr2Renderer::GetProjectionTransform();

	auto upscalingInfo = renderContext.GetPrimaryRenderContext().GetUpscalingInfo( Tr2Renderer::GetUpscalingContextID() );
	if( upscalingInfo.technique != Tr2UpscalingAL::NONE && upscalingInfo.temporal )
	{
		m_jitter.x = upscalingInfo.jitterX;
		m_jitter.y = upscalingInfo.jitterY;
		m_jitterMatrix = TranslationMatrix( Vector3( m_jitter.x, m_jitter.y, 0 ) );
		m_jitteredProjection = m_projection * m_jitterMatrix;
	}
	else if( m_sceneDefaultPostProcess && m_sceneDefaultPostProcess->GetTaaIfAvailable() != nullptr )
	{
		auto rtWidth = renderContext.m_esm.GetRenderTargetWidth();
		auto rtHeight = renderContext.m_esm.GetRenderTargetHeight();
		const Vector2 samplingPatterns[] = { Vector2( .125f, -.375f ),
											 Vector2( -.125f, .375f ),
											 Vector2( .375f, .125f ),
											 Vector2( -.375f, -.125f ) };

		auto frame = renderContext.GetPrimaryRenderContext().GetRecordingFrameNumber();
		auto samplingIndex = frame % ( sizeof( samplingPatterns ) / sizeof( samplingPatterns[0] ) );

		m_jitter.x = 2.0f * samplingPatterns[samplingIndex].x / float( rtWidth );
		m_jitter.y = 2.0f * samplingPatterns[samplingIndex].y / float( rtHeight );

		auto currJitterOffset = Vector3( m_jitter.x, m_jitter.y, 0 );

		m_jitterMatrix = TranslationMatrix( currJitterOffset );
		m_jitteredProjection = m_projection * m_jitterMatrix;
	}
	else
	{
		m_jitterMatrix = IdentityMatrix();
		m_jitteredProjection = m_projection;
		m_jitter.x = m_jitter.y = 0.0f;
	}
}


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