/// <summary>
/// Draw a single texture from grid.
/// </summary>
/// <param name="batch">Spritebatch to draw on. Expected to be after 'Begin' was called.</param>
/// <param name="texture">The grid texture itself.</param>
/// <param name="offset">Optional drawing offset.</param>
protected void DrawGridTexture(SpriteBatch batch, StaticBatchTexture texture, Point?offset)
{
// draw with offset
if (offset.HasValue)
{
var dest = texture.DestRect;
dest.Location += offset.Value;
batch.Draw(texture.Texture, dest, Color.White);
}
// draw without offset
else
{
batch.Draw(texture.Texture, texture.DestRect, Color.White);
}
// count draw calls
LastDrawCallsCount++;
}
/// <summary>
/// Build the static batch from the list of sprites previously added to it.
/// </summary>
/// <param name="batch">Spritebatch to use for rendering.</param>
/// <param name="clear">If true, will clear previous textures first. If false, will redraw on them.</param>
/// <param name="releaseSpritesList">If true, will clear the current list of sprites after done building batch.</param>
/// <param name="beginBatchHandler">If provided, this function will be called every time we need to begin a drawing batch.
/// This provides the ability to choose how to begin the drawing batch, and add your own params and flags to it.</param>
public void Build(SpriteBatch batch, bool clear = true, bool releaseSpritesList = true, BeginBatchHandler beginBatchHandler = null)
{
// clear previous textures if set to clear.
if (clear)
{
Clear();
}
// dictionary to sort static sprites into cells, before rendering them
Dictionary <Point, List <StaticSprite> > sortedSprites = new Dictionary <Point, List <StaticSprite> >();
// used internally
Point pointOne = new Point(1, 1);
// arrange static sprites in grid
foreach (var sprite in _spritesPending)
{
// calc the indexes this sprite is a part of
Point startIndex = (sprite.BoundingRect.Location / _chunkSize);
Point endIndex = startIndex + (sprite.BoundingRect.Size / _chunkSize) + pointOne;
// add to sorted sprites dictionary
Point currIndex = new Point();
for (currIndex.X = startIndex.X; currIndex.X <= endIndex.X; ++currIndex.X)
{
for (currIndex.Y = startIndex.Y; currIndex.Y <= endIndex.Y; ++currIndex.Y)
{
sortedSprites.GetOrCreate(currIndex).Add(sprite);
}
}
}
// now that we got sprites arranged into cells, draw them
foreach (var indexAndSprite in sortedSprites)
{
// get current grid texture
StaticBatchTexture currTexture;
if (!_textures.TryGetValue(indexAndSprite.Key, out currTexture))
{
_textures[indexAndSprite.Key] = currTexture = new StaticBatchTexture(_device, indexAndSprite.Key, _chunkSize);
}
// begin drawing batch
if (beginBatchHandler != null)
{
beginBatchHandler(batch);
}
else
{
batch.Begin(DefaultSortMode, DefaultBlend, DefaultSamplerState);
}
// set rendering target
_device.SetRenderTarget(currTexture.Texture);
_device.Clear(Color.Transparent);
// draw all sprites on it
foreach (var sprite in indexAndSprite.Value)
{
// set relative dest rect
var dest = sprite.DestRect;
dest.Location -= currTexture.DestRect.Location;
// draw sprite on texture
batch.Draw(sprite.Texture,
dest,
sprite.SourceRect,
sprite.Color,
sprite.Rotation,
sprite.Origin,
sprite.SpriteEffect,
sprite.ZIndex);
}
// end drawing current texture
batch.End();
_device.SetRenderTarget(null);
}
// release previous list
if (releaseSpritesList)
{
_spritesPending.Clear();
}
}
