public SpriteBatch( GraphicsContext graphics, int maxSpriteCount )
{
int maxVertexCount = maxSpriteCount * 4 ;
int maxIndexCount = maxSpriteCount * 6 ;
graphicsContext = graphics ;
#if !RESIZE_VERTEX_BUFFER
vertexBuffer = new VertexBuffer( maxVertexCount, maxIndexCount, vertexFormats ) ;
spriteCapacity = maxSpriteCount ;
#endif // RESIZE_VERTEX_BUFFER
vertexData = new Vertex[ maxVertexCount ] ;
indexData = new ushort[ maxIndexCount ] ;
spriteList = new Sprite[ maxSpriteCount ] ;
sortedList = new Sprite[ maxSpriteCount ] ;
#if ENABLE_SIN_TABLE
if ( sinTable == null ) {
sinTable = new float[ 4096 ] ;
for ( int i = 0 ; i < 4096 ; i ++ ) {
sinTable[ i ] = FMath.Sin( i * ( FMath.PI / 2048.0f ) ) ;
}
}
#endif // ENABLE_SIN_TABLE
}
public void RemoveSprite( Sprite sprite )
{
RemoveFromSpriteList( sprite ) ;
RemoveFromSortedList( sprite ) ;
sprite.batch = null ;
vertexCount -= 4 ;
indexCount -= 6 ;
}
public void AddSprite( Sprite sprite )
{
AddToSpriteList( sprite ) ;
AddToSortedList( sprite ) ;
sprite.batch = this ;
vertexCount += 4 ;
indexCount += 6 ;
}
public void SetSpriteCount( int count )
{
count = Math.Min( Math.Max( count, 1 ), sprites.Length ) ;
if ( count > spriteCount ) {
for ( int i = spriteCount ; i < count ; i ++ ) {
sprites[ i ] = new Sprite( batch, material, 0 ) ;
InitSprite( sprites[ i ] ) ;
}
} else {
for ( int i = count ; i < spriteCount ; i ++ ) {
batch.RemoveSprite( sprites[ i ] ) ;
}
}
spriteCount = count ;
}
public void InitSprite( Sprite s )
{
s.Position.X = 0;
s.Position.Y = 0;
s.Direction.X = 0;
s.Direction.Y = 0;
s.Size = new Vector2( spriteSize, spriteSize ) ;
s.Center = new Vector2( 0.5f, 0.5f ) ;
s.UVOffset = new Vector2( 0.25f, 0.25f ) ;
s.UVSize = new Vector2( 0.25f, 0.25f ) ;
s.Color = new Rgba( 255, 255, 255, 255 ) ;
s.UpdateAll() ;
}
internal int FindSortedList( Sprite sprite )
{
int lower = -1 ;
int upper = sortedCount ;
while ( lower + 1 < upper ) {
int middle = ( lower + upper ) / 2 ;
if ( sortedList[ middle ].sortKey > sprite.sortKey ) {
upper = middle ;
} else {
lower = middle ;
}
}
return lower ;
}
internal void RemoveFromSortedList( Sprite sprite )
{
int index = FindSortedList( sprite ) ;
if ( sortedList[ index ] == sprite ) {
sortedList[ index ] = sprite.sortNext ;
if ( sprite.sortNext == sprite ) {
int count = ( -- sortedCount ) - index ;
if ( count > 0 ) Array.Copy( sortedList, index + 1, sortedList, index, count ) ;
}
}
sprite.sortPrev.sortNext = sprite.sortNext ;
sprite.sortNext.sortPrev = sprite.sortPrev ;
needUpdateIndexData = true ;
}
internal void AddToSortedList( Sprite sprite )
{
int index = FindSortedList( sprite ) ;
if ( index >= 0 && sortedList[ index ].sortKey == sprite.sortKey ) {
var head = sortedList[ index ] ;
var tail = head.sortPrev ;
head.sortPrev = sprite ;
tail.sortNext = sprite ;
sprite.sortPrev = tail ;
sprite.sortNext = head ;
} else {
int count = ( sortedCount ++ ) - ( ++ index ) ;
if ( count > 0 ) Array.Copy( sortedList, index, sortedList, index + 1, count ) ;
sortedList[ index ] = sprite ;
sprite.sortPrev = sprite ;
sprite.sortNext = sprite ;
}
sprite.indexID = -1 ;
needUpdateIndexData = true ;
}
internal void RemoveFromSpriteList( Sprite sprite )
{
var tail = spriteList[ -- spriteCount ] ;
if ( sprite != tail ) {
spriteList[ sprite.spriteID ] = tail ;
for ( int i = 0 ; i < 4 ; i ++ ) {
vertexData[ sprite.vertexID + i ] = vertexData[ tail.vertexID + i ] ;
}
tail.spriteID = sprite.spriteID ;
tail.vertexID = sprite.vertexID ;
}
needUpdateVertexData = true ;
}
// Subroutines
internal void AddToSpriteList( Sprite sprite )
{
sprite.spriteID = spriteCount ;
sprite.vertexID = vertexCount ;
spriteList[ spriteCount ++ ] = sprite ;
needUpdateVertexData = true ;
}