#include "IndexBuffer.h"
#include "GraphicsThrowMacros.h"

IndexBuffer::IndexBuffer( Graphics& gfx,const std::vector<unsigned short>& indices )
	:
	count( (UINT)indices.size() )
{
	INFOMAN( gfx );

	D3D11_BUFFER_DESC ibd = {};
	ibd.BindFlags = D3D11_BIND_INDEX_BUFFER;
	ibd.Usage = D3D11_USAGE_DEFAULT;
	ibd.CPUAccessFlags = 0u;
	ibd.MiscFlags = 0u;
	ibd.ByteWidth = UINT( count * sizeof( unsigned short ) );
	ibd.StructureByteStride = sizeof( unsigned short );
	D3D11_SUBRESOURCE_DATA isd = {};
	isd.pSysMem = indices.data();
	GFX_THROW_INFO( GetDevice( gfx )->CreateBuffer( &ibd,&isd,&pIndexBuffer ) );
}

void IndexBuffer::Bind( Graphics& gfx ) noexcept
{
	GetContext( gfx )->IASetIndexBuffer( pIndexBuffer.Get(),DXGI_FORMAT_R16_UINT,0u );
}

UINT IndexBuffer::GetCount() const noexcept
{
	return count;
}