/// <summary>
/// Constructor to set up mesh
/// </summary>
public TerrainMesh(GraphicsDevice graphicsDevice, TerrainPatch patch, int level)
{
terrainPatch = patch;
mipLevel = level;
int scale = 1;
for (int i = mipLevel; i > 0; i--)
{
scale *= 2;
}
meshSize = (short)(TerrainPatch.patchSize / scale + 1);
// Create vertex buffer for this mipmap
vertices = new VertexPositionNormal[meshSize * meshSize];
patchVertexBuffer = new DynamicVertexBuffer(graphicsDevice,
VertexPositionNormal.vertexDeclaration, vertices.Length, BufferUsage.WriteOnly);
}
/*
* public void BuildMeshData(GraphicsDevice graphicsDevice)
* {
* // Iterate backwards because we need to grab neighboring edges for normals
* for (int i = (int)(gridSize.X * gridSize.Y) - 1; i >= 0; i--)
* {
* int x = i % (int)gridSize.X;
* int y = i / (int)gridSize.Y;
*
* Vector2 offset = new Vector2(x, y);
* TerrainPatch currentPatch = new TerrainPatch(graphicsDevice, offset);
*
* // find south and east neighbors
* if (y < gridSize.Y - 1) currentPatch.neighbors[1] = terrainPatches[y + 1, x];
* if (x < gridSize.X - 1) currentPatch.neighbors[3] = terrainPatches[y, x + 1];
*
* currentPatch.UpdateMap(heightData, scale, heightScale, mapPosition, indices);
*
* terrainPatches[y, x] = currentPatch;
* visiblePatches.Add(terrainPatches[y, x]);
* }
*
* // Second pass, find its other neighbors
* /*
* for (int y = 0; y < gridSize.Y; y++)
* {
* for (int x = 0; x < gridSize.X; x++)
* {
* TerrainPatch currentPatch = terrainPatches[x, y];
*
* // Find north and west neighbors
* if (y > 0) currentPatch.neighbors[0] = terrainPatches[y - 1, x];
* if (x > 0) currentPatch.neighbors[2] = terrainPatches[y, x - 1];
* }
* }
* }
*/
/// <summary>
/// Build the array of terrain patches to draw with
/// </summary>
public bool BuildMeshData(GraphicsDevice graphicsDevice)
{
// Iterate backwards because we need to grab neighboring edges for normals
for (int i = 0; i < tilesToBuild; i++)
{
int x = nextPatch % (int)gridSize.X;
int y = nextPatch / (int)gridSize.Y;
Vector2 offset = new Vector2(x, y);
TerrainPatch currentPatch = new TerrainPatch(graphicsDevice, offset);
// find south and east neighbors
if (y < gridSize.Y - 1)
{
currentPatch.neighbors[1] = terrainPatches[y + 1, x];
}
if (x < gridSize.X - 1)
{
currentPatch.neighbors[3] = terrainPatches[y, x + 1];
}
currentPatch.UpdateMap(heightData, scale, heightScale, mapPosition, indices);
terrainPatches[y, x] = currentPatch;
visiblePatches.Add(terrainPatches[y, x]);
nextPatch--;
patchesBuilt++;
// Finish updating this frame
if (patchesBuilt == (gridSize.X * gridSize.Y))
{
// All patches have been built
return(true);
}
}
return(false);
}
