public void ComputeLightMap(SpriteBatch batch, Map map, string Path)
{
Camera cam = new Camera(Vector2.Zero, map.MapBoundaries);
cam.Zoom(-1);
Vector2 viewFieldDiagonal = new Vector2(cam.ViewSpace.Width *0.5f, cam.ViewSpace.Height *0.5f);
cam.SetPos(viewFieldDiagonal);
lightMapTarget = new RenderTarget2D(device, map.MapBoundaries.Width, map.MapBoundaries.Height,false, SurfaceFormat.Color, DepthFormat.Depth24Stencil8);
Matrix baseProjection = cam.ProjectionMatrix;
map.SetUpLightMapPrecomputeLights();
device.SetRenderTarget(lightMapTarget);
//Clear Target first
device.DepthStencilState = clearStencil;
device.RasterizerState = RasterizerState.CullNone;
device.BlendState = BlendState.Opaque;
shadowEffect.Parameters["View"].SetValue(cam.ViewMatrix);
shadowEffect.Parameters["Projection"].SetValue(Matrix.Identity);
shadowEffect.Parameters["shadowDarkness"].SetValue(0.9f - 1);
shadowEffect.Parameters["viewDistance"].SetValue((float)(1 / (0.001f + 0.999 )));
shadowEffect.CurrentTechnique = shadowEffect.Techniques["Clear"];
device.SetVertexBuffer(clearVBuffer);
device.Indices = clearIBuffer;
shadowEffect.CurrentTechnique.Passes[0].Apply();
device.DrawIndexedPrimitives(PrimitiveType.TriangleList, 0, 0, 4, 0, 2);
//Matrix UpperLeftShift = Matrix.CreateTranslation(-1+(float)cam.ViewSpace.Width / (float)map.MapBoundaries.Width, 1-(float)cam.ViewSpace.Height / (float)map.MapBoundaries.Height, 0);
//cam.ProjectionMatrix = baseProjection * Matrix.CreateScale((float)cam.ViewSpace.Width / map.MapBoundaries.Width, (float)cam.ViewSpace.Height / map.MapBoundaries.Height, 1) * UpperLeftShift * Matrix.CreateTranslation(cam.ViewSpace.Left / map.MapBoundaries.Width, cam.ViewSpace.Top / map.MapBoundaries.Height, 0);
DrawLights(1, cam, batch, lightMapTarget);
//cam.Move(new Vector2(0, viewFieldDiagonal.Y * 2));
RenderTarget2D blurTarget = new RenderTarget2D(device,lightMapTarget.Width,lightMapTarget.Height);
shadowEffect.Parameters["xTexelDist"].SetValue(1.0f / (blurTarget.Width / lightMapDownSample));
shadowEffect.Parameters["yTexelDist"].SetValue(1.0f / (blurTarget.Height / lightMapDownSample));
BlurShadowTarget(batch, lightMapTarget, blurTarget);
BlurShadowTarget(batch, lightMapTarget, blurTarget);
shadowEffect.Parameters["xTexelDist"].SetValue(1.0f / (device.PresentationParameters.BackBufferWidth / lightMapDownSample));
shadowEffect.Parameters["yTexelDist"].SetValue(1.0f / (device.PresentationParameters.BackBufferHeight / lightMapDownSample));
device.SetRenderTarget(null);
Clear();
System.IO.FileStream fs = System.IO.File.Open(Path, System.IO.FileMode.Create);
lightMapTarget.SaveAsPng(fs, lightMapTarget.Width, lightMapTarget.Height);
fs.Close();
lightMap = lightMapTarget;
_hasLightmap = true;
}
