private static IEnumerable <VertexPositionTexture> CreateVertices(Texture2D texture, Vector2 position, Rectangle sourceRectangle, TiledMapTileFlipFlags flags = TiledMapTileFlipFlags.None)
{
var reciprocalWidth = 1f / texture.Width;
var reciprocalHeight = 1f / texture.Height;
var texelLeft = (sourceRectangle.X + 0.5f) * reciprocalWidth;
var texelTop = (sourceRectangle.Y + 0.5f) * reciprocalHeight;
var texelRight = (sourceRectangle.X + sourceRectangle.Width) * reciprocalWidth;
var texelBottom = (sourceRectangle.Y + sourceRectangle.Height) * reciprocalHeight;
VertexPositionTexture vertexTopLeft, vertexTopRight, vertexBottomLeft, vertexBottomRight;
vertexTopLeft.Position = new Vector3(position, 0);
vertexTopRight.Position = new Vector3(position + new Vector2(sourceRectangle.Width, 0), 0);
vertexBottomLeft.Position = new Vector3(position + new Vector2(0, sourceRectangle.Height), 0);
vertexBottomRight.Position = new Vector3(position + new Vector2(sourceRectangle.Width, sourceRectangle.Height), 0);
vertexTopLeft.TextureCoordinate.Y = texelTop;
vertexTopLeft.TextureCoordinate.X = texelLeft;
vertexTopRight.TextureCoordinate.Y = texelTop;
vertexTopRight.TextureCoordinate.X = texelRight;
vertexBottomLeft.TextureCoordinate.Y = texelBottom;
vertexBottomLeft.TextureCoordinate.X = texelLeft;
vertexBottomRight.TextureCoordinate.Y = texelBottom;
vertexBottomRight.TextureCoordinate.X = texelRight;
var flipDiagonally = (flags & TiledMapTileFlipFlags.FlipDiagonally) != 0;
var flipHorizontally = (flags & TiledMapTileFlipFlags.FlipHorizontally) != 0;
var flipVertically = (flags & TiledMapTileFlipFlags.FlipVertically) != 0;
if (flipDiagonally)
{
FloatHelper.Swap(ref vertexTopRight.TextureCoordinate.X, ref vertexBottomLeft.TextureCoordinate.X);
FloatHelper.Swap(ref vertexTopRight.TextureCoordinate.Y, ref vertexBottomLeft.TextureCoordinate.Y);
}
if (flipHorizontally)
{
if (flipDiagonally)
{
FloatHelper.Swap(ref vertexTopLeft.TextureCoordinate.Y, ref vertexTopRight.TextureCoordinate.Y);
FloatHelper.Swap(ref vertexBottomLeft.TextureCoordinate.Y, ref vertexBottomRight.TextureCoordinate.Y);
}
else
{
FloatHelper.Swap(ref vertexTopLeft.TextureCoordinate.X, ref vertexTopRight.TextureCoordinate.X);
FloatHelper.Swap(ref vertexBottomLeft.TextureCoordinate.X, ref vertexBottomRight.TextureCoordinate.X);
}
}
if (flipVertically)
{
if (flipDiagonally)
{
FloatHelper.Swap(ref vertexTopLeft.TextureCoordinate.X, ref vertexBottomLeft.TextureCoordinate.X);
FloatHelper.Swap(ref vertexTopRight.TextureCoordinate.X, ref vertexBottomRight.TextureCoordinate.X);
}
else
{
FloatHelper.Swap(ref vertexTopLeft.TextureCoordinate.Y, ref vertexBottomLeft.TextureCoordinate.Y);
FloatHelper.Swap(ref vertexTopRight.TextureCoordinate.Y, ref vertexBottomRight.TextureCoordinate.Y);
}
}
yield return(vertexTopLeft);
yield return(vertexTopRight);
yield return(vertexBottomLeft);
yield return(vertexBottomRight);
}
public void AddTileVertices(Point2 position, Rectangle?sourceRectangle = null, TiledMapTileFlipFlags flags = TiledMapTileFlipFlags.None)
{
float texelLeft, texelTop, texelRight, texelBottom;
var sourceRectangle1 = sourceRectangle ?? new Rectangle(0, 0, (int)ImageSize.Width, (int)ImageSize.Height);
if (sourceRectangle.HasValue)
{
var reciprocalWidth = 1f / ImageSize.Width;
var reciprocalHeight = 1f / ImageSize.Height;
texelLeft = (sourceRectangle1.X + 0.5f) * reciprocalWidth;
texelTop = (sourceRectangle1.Y + 0.5f) * reciprocalHeight;
texelRight = (sourceRectangle1.X + sourceRectangle1.Width) * reciprocalWidth;
texelBottom = (sourceRectangle1.Y + sourceRectangle1.Height) * reciprocalHeight;
}
else
{
texelLeft = 0;
texelTop = 0;
texelBottom = 1;
texelRight = 1;
}
VertexPositionTexture vertexTopLeft, vertexTopRight, vertexBottomLeft, vertexBottomRight;
vertexTopLeft.Position = new Vector3(position, 0);
vertexTopRight.Position = new Vector3(position + new Vector2(sourceRectangle1.Width, 0), 0);
vertexBottomLeft.Position = new Vector3(position + new Vector2(0, sourceRectangle1.Height), 0);
vertexBottomRight.Position =
new Vector3(position + new Vector2(sourceRectangle1.Width, sourceRectangle1.Height), 0);
vertexTopLeft.TextureCoordinate.Y = texelTop;
vertexTopLeft.TextureCoordinate.X = texelLeft;
vertexTopRight.TextureCoordinate.Y = texelTop;
vertexTopRight.TextureCoordinate.X = texelRight;
vertexBottomLeft.TextureCoordinate.Y = texelBottom;
vertexBottomLeft.TextureCoordinate.X = texelLeft;
vertexBottomRight.TextureCoordinate.Y = texelBottom;
vertexBottomRight.TextureCoordinate.X = texelRight;
var flipDiagonally = (flags & TiledMapTileFlipFlags.FlipDiagonally) != 0;
var flipHorizontally = (flags & TiledMapTileFlipFlags.FlipHorizontally) != 0;
var flipVertically = (flags & TiledMapTileFlipFlags.FlipVertically) != 0;
if (flipDiagonally)
{
FloatHelper.Swap(ref vertexTopRight.TextureCoordinate.X, ref vertexBottomLeft.TextureCoordinate.X);
FloatHelper.Swap(ref vertexTopRight.TextureCoordinate.Y, ref vertexBottomLeft.TextureCoordinate.Y);
}
if (flipHorizontally)
{
if (flipDiagonally)
{
FloatHelper.Swap(ref vertexTopLeft.TextureCoordinate.Y, ref vertexTopRight.TextureCoordinate.Y);
FloatHelper.Swap(ref vertexBottomLeft.TextureCoordinate.Y, ref vertexBottomRight.TextureCoordinate.Y);
}
else
{
FloatHelper.Swap(ref vertexTopLeft.TextureCoordinate.X, ref vertexTopRight.TextureCoordinate.X);
FloatHelper.Swap(ref vertexBottomLeft.TextureCoordinate.X, ref vertexBottomRight.TextureCoordinate.X);
}
}
if (flipVertically)
{
if (flipDiagonally)
{
FloatHelper.Swap(ref vertexTopLeft.TextureCoordinate.X, ref vertexBottomLeft.TextureCoordinate.X);
FloatHelper.Swap(ref vertexTopRight.TextureCoordinate.X, ref vertexBottomRight.TextureCoordinate.X);
}
else
{
FloatHelper.Swap(ref vertexTopLeft.TextureCoordinate.Y, ref vertexBottomLeft.TextureCoordinate.Y);
FloatHelper.Swap(ref vertexTopRight.TextureCoordinate.Y, ref vertexBottomRight.TextureCoordinate.Y);
}
}
_vertices.Add(vertexTopLeft);
_vertices.Add(vertexTopRight);
_vertices.Add(vertexBottomLeft);
_vertices.Add(vertexBottomRight);
Debug.Assert(Vertices.Count <= TiledMapHelper.MaximumVerticesPerModel);
}
public void AddSprite(Texture2D texture, Point2 position, Rectangle sourceRectangle, TiledMapTileFlipFlags flipFlags)
{
Indices.AddRange(CreateTileIndices(Vertices.Count));
Debug.Assert(Indices.Count <= TiledMapHelper.MaximumIndicesPerModel);
Vertices.AddRange(CreateVertices(texture, position, sourceRectangle, flipFlags));
Debug.Assert(Vertices.Count <= TiledMapHelper.MaximumVerticesPerModel);
}