#include "LightArea.h"

LightArea::LightArea(ShadowmapSize size)
{
    LPDIRECT3DDEVICE9 device = static_cast<D3DRenderSystem*>(EngineRoot::GetSingleton()->GetRenderSystem())->GetD3DDevice();

    int baseSize = 2 << (int)size;
    LightAreaSize = Vector2(baseSize, baseSize);
    device->CreateTexture(baseSize, baseSize, 1, D3DUSAGE_RENDERTARGET, D3DFMT_X8B8G8R8, D3DPOOL_DEFAULT, &RenderTarget, NULL);
    D3DXCreateSprite(static_cast<D3DRenderSystem*>(EngineRoot::GetSingleton()->GetRenderSystem())->GetD3DDevice(), &quadRender);
}

Vector2 LightArea::ToRelativePosition(Vector2 worldPosition)
{
    return worldPosition - (LightPosition - LightAreaSize * 0.5f);
}

void LightArea::BeginDrawingShadowCasters()
{
    LPDIRECT3DDEVICE9 device = static_cast<D3DRenderSystem*>(EngineRoot::GetSingleton()->GetRenderSystem())->GetD3DDevice();
    device->GetRenderTarget(0, &originalRenderTarget);

    LPDIRECT3DSURFACE9 rtSurface;
    RenderTarget->GetSurfaceLevel(0, &rtSurface);

    device->SetRenderTarget(0, rtSurface);
    device->Clear(0, 0, D3DCLEAR_TARGET, D3DCOLOR_RGBA(255, 255, 255, 0), 0, 1);
    device->BeginScene();

    quadRender->Begin(D3DXSPRITE_ALPHABLEND);
    //graphicsDevice.SetRenderTarget(RenderTarget);
    //graphicsDevice.Clear(Color.Transparent);
}

void LightArea::EndDrawingShadowCasters()
{
    LPDIRECT3DDEVICE9 device = static_cast<D3DRenderSystem*>(EngineRoot::GetSingleton()->GetRenderSystem())->GetD3DDevice();

    quadRender->End();
    device->EndScene();
    device->SetRenderTarget(0, originalRenderTarget);
}