private TerrainPatch CreatePatch(
TerrainMaterial terrainMaterial,
HeightMap heightMap,
BlendTileData blendTileData,
Rectangle patchBounds,
GraphicsDevice graphicsDevice,
TerrainPatchIndexBufferCache indexBufferCache)
{
var indexBuffer = indexBufferCache.GetIndexBuffer(
patchBounds.Width,
patchBounds.Height,
out var indices);
var vertexBuffer = AddDisposable(CreateVertexBuffer(
graphicsDevice,
heightMap,
patchBounds,
indices,
out var boundingBox,
out var triangles));
return(new TerrainPatch(
terrainMaterial,
patchBounds,
vertexBuffer,
indexBuffer,
(uint)indices.Length,
triangles,
boundingBox));
}
private TerrainPatchComponent CreatePatch(
TerrainEffect terrainEffect,
EffectPipelineStateHandle pipelineStateHandle,
HeightMap heightMap,
BlendTileData blendTileData,
Int32Rect patchBounds,
GraphicsDevice graphicsDevice,
ResourceUploadBatch uploadBatch,
TerrainPatchIndexBufferCache indexBufferCache)
{
var indexBuffer = indexBufferCache.GetIndexBuffer(
patchBounds.Width,
patchBounds.Height,
uploadBatch,
out var indices);
var vertexBuffer = AddDisposable(CreateVertexBuffer(
graphicsDevice,
uploadBatch,
heightMap,
patchBounds,
indices,
out var boundingBox,
out var triangles));
return(new TerrainPatchComponent(
terrainEffect,
pipelineStateHandle,
patchBounds,
vertexBuffer,
indexBuffer,
triangles,
boundingBox));
}
private void CreatePatches(
GraphicsDevice graphicsDevice,
ResourceUploadBatch uploadBatch,
Entity terrainEntity,
HeightMap heightMap,
BlendTileData blendTileData,
TerrainEffect terrainEffect,
EffectPipelineStateHandle pipelineStateHandle,
TerrainPatchIndexBufferCache indexBufferCache)
{
const int numTilesPerPatch = TerrainComponent.PatchSize - 1;
var numPatchesX = heightMap.Width / numTilesPerPatch;
if (heightMap.Width % numTilesPerPatch != 0)
{
numPatchesX += 1;
}
var numPatchesY = heightMap.Height / numTilesPerPatch;
if (heightMap.Height % numTilesPerPatch != 0)
{
numPatchesY += 1;
}
for (var y = 0; y < numPatchesY; y++)
{
for (var x = 0; x < numPatchesX; x++)
{
var patchX = x * numTilesPerPatch;
var patchY = y * numTilesPerPatch;
var patchBounds = new Int32Rect
{
X = patchX,
Y = patchY,
Width = Math.Min(TerrainComponent.PatchSize, heightMap.Width - patchX),
Height = Math.Min(TerrainComponent.PatchSize, heightMap.Height - patchY)
};
terrainEntity.Components.Add(CreatePatch(
terrainEffect,
pipelineStateHandle,
heightMap,
blendTileData,
patchBounds,
graphicsDevice,
uploadBatch,
indexBufferCache));
}
}
}
private List <TerrainPatch> CreatePatches(
GraphicsDevice graphicsDevice,
HeightMap heightMap,
BlendTileData blendTileData,
TerrainMaterial terrainMaterial,
TerrainPatchIndexBufferCache indexBufferCache)
{
const int numTilesPerPatch = Terrain.Terrain.PatchSize - 1;
var heightMapWidthMinusOne = heightMap.Width - 1;
var numPatchesX = heightMapWidthMinusOne / numTilesPerPatch;
if (heightMapWidthMinusOne % numTilesPerPatch != 0)
{
numPatchesX += 1;
}
var heightMapHeightMinusOne = heightMap.Height - 1;
var numPatchesY = heightMapHeightMinusOne / numTilesPerPatch;
if (heightMapHeightMinusOne % numTilesPerPatch != 0)
{
numPatchesY += 1;
}
var patches = new List <TerrainPatch>();
for (var y = 0; y < numPatchesY; y++)
{
for (var x = 0; x < numPatchesX; x++)
{
var patchX = x * numTilesPerPatch;
var patchY = y * numTilesPerPatch;
var patchBounds = new Rectangle(
patchX,
patchY,
Math.Min(Terrain.Terrain.PatchSize, heightMap.Width - patchX),
Math.Min(Terrain.Terrain.PatchSize, heightMap.Height - patchY));
patches.Add(CreatePatch(
terrainMaterial,
heightMap,
blendTileData,
patchBounds,
graphicsDevice,
indexBufferCache));
}
}
return(patches);
}