void DrawDebugGarbage(GameTime gameTime)
{
var fps = 1.0 / gameTime.ElapsedGameTime.TotalSeconds;
var dbgi = GardenChunk.Index(dbgi_x, dbgi_y);
var dbg = garden.Chunks[0].Vertices[dbgi];
var cat = (squareEffect.World * squareEffect.View * squareEffect.Projection);
var p2 = Vector4.Transform(new Vector4(dbg.Position, 1), cat);
var pp = GraphicsDevice.Viewport.Project(
dbg.Position,
squareEffect.Projection,
squareEffect.View,
squareEffect.World);
var spriteBatch = new SpriteBatch(GraphicsDevice);
spriteBatch.Begin();
spriteBatch.DrawString(
font,
$"{fps:0.00} {zoom:0.00} {yaw:0.00} {dv(dbg.Position)} " +
$"{dv(p2)} {dv(pp)}",
new Vector2(10, 10),
Color.White);
Vector2 xp = new Vector2(pp.X - 6, pp.Y - 6);
spriteBatch.DrawString(font, "X", xp, Color.White);
spriteBatch.End();
}
static IndexBuffer BuildChunkIndexBuffer(GraphicsDevice device, GardenChunk chunk)
{
int cursor = 0;
int indexCount =
(GardenChunk.Width - 1) * (GardenChunk.Height - 1) * 6;
short[] indices = new short[indexCount];
for (int y = 0; y < GardenChunk.Height - 1; y++)
{
for (int x = 0; x < GardenChunk.Width - 1; x++)
{
indices[cursor + 0] = (short)GardenChunk.Index(x + 0, y + 1);
indices[cursor + 1] = (short)GardenChunk.Index(x + 0, y + 0);
indices[cursor + 2] = (short)GardenChunk.Index(x + 1, y + 1);
indices[cursor + 3] = (short)GardenChunk.Index(x + 1, y + 1);
indices[cursor + 4] = (short)GardenChunk.Index(x + 0, y + 0);
indices[cursor + 5] = (short)GardenChunk.Index(x + 1, y + 0);
cursor += 6;
}
}
var gardenIndices = new IndexBuffer(
device,
typeof(short),
indices.Length,
BufferUsage.WriteOnly);
gardenIndices.SetData(indices);
return(gardenIndices);
}
void DrawChunk(int wx, int wy)
{
int ci = Garden.Index(wx, wy);
IndexBuffer indexBuffer = gardenIndices[ci];
if (indexBuffer == null)
{
indexBuffer = gardenIndices[ci] = BuildChunkIndexBuffer(
GraphicsDevice, garden.Chunks[ci]);
}
GraphicsDevice.Indices = indexBuffer;
VertexBuffer vertexBuffer = gardenVertices[ci];
if (vertexBuffer == null)
{
GardenChunk chunk = garden.Chunks[ci];
VertexPositionColor[] vertices = chunk.Vertices;
vertexBuffer = gardenVertices[ci] = new VertexBuffer(
GraphicsDevice,
typeof(VertexPositionColor),
vertices.Length,
BufferUsage.WriteOnly);
gardenVertices[ci].SetData(vertices);
}
GraphicsDevice.SetVertexBuffer(vertexBuffer);
squareEffect.World = Matrix.CreateTranslation(
wx * (GardenChunk.Width - 1),
0,
wy * (GardenChunk.Height - 1));
foreach (EffectPass pass in squareEffect.CurrentTechnique.Passes)
{
pass.Apply();
GraphicsDevice.DrawIndexedPrimitives(
primitiveType: PrimitiveType.TriangleList,
baseVertex: 0,
startIndex: 0,
primitiveCount: indexBuffer.IndexCount / 3);
}
}