private void Update(Context context, ClipmapUpdate update, ClipmapLevel level, RasterDataDetails details, RasterLevel rasterLevel)
{
ClipmapUpdate[] updates = SplitUpdateToAvoidWrapping(update, details);
foreach (ClipmapUpdate nonWrappingUpdate in updates)
{
RasterTileRegion[] tileRegions = rasterLevel.GetTilesInExtent(nonWrappingUpdate.West, nonWrappingUpdate.South, nonWrappingUpdate.East, nonWrappingUpdate.North);
foreach (RasterTileRegion region in tileRegions)
{
Texture2D tileTexture;
bool loaded = details.LoadedTiles.TryGetValue(region.Tile.Identifier, out tileTexture);
if (loaded)
{
RenderTileToLevelTexture(context, level, details, region, tileTexture);
}
else
{
UpsampleTileData(context, level, details, region);
}
}
}
if (details.Type == RasterType.Terrain)
{
// Normals at edges are incorrect, so include a one-post buffer around the update region
// when updating normals in order to update normals that were previously at the edge.
ClipmapUpdate updateWithBuffer = update.AddBufferWithinLevelNextExtent();
ClipmapUpdate[] normalUpdates = SplitUpdateToAvoidWrapping(updateWithBuffer, details);
foreach (ClipmapUpdate normalUpdate in normalUpdates)
{
UpdateNormals(context, normalUpdate);
}
}
}
private void UpdateImagery(ClipmapLevel level, ClipmapLevel coarserLevel, Context context, SceneState sceneState)
{
int deltaX = level.NextImageryExtent.West - level.CurrentImageryExtent.West;
int deltaY = level.NextImageryExtent.South - level.CurrentImageryExtent.South;
if (deltaX == 0 && deltaY == 0)
{
return;
}
int minLongitude = deltaX > 0 ? level.CurrentImageryExtent.East + 1 : level.NextImageryExtent.West;
int maxLongitude = deltaX > 0 ? level.NextImageryExtent.East : level.CurrentImageryExtent.West - 1;
int minLatitude = deltaY > 0 ? level.CurrentImageryExtent.North + 1 : level.NextImageryExtent.South;
int maxLatitude = deltaY > 0 ? level.NextImageryExtent.North : level.CurrentImageryExtent.South - 1;
int width = maxLongitude - minLongitude + 1;
int height = maxLatitude - minLatitude + 1;
if (level.CurrentImageryExtent.West > level.CurrentImageryExtent.East || // initial update
width >= level.ImageryWidth || height >= level.ImageryHeight) // complete update
{
// Initial or complete update.
width = level.ImageryWidth;
height = level.ImageryHeight;
deltaX = level.ImageryWidth;
deltaY = level.ImageryHeight;
minLongitude = level.NextImageryExtent.West;
maxLongitude = level.NextImageryExtent.East;
minLatitude = level.NextImageryExtent.South;
maxLatitude = level.NextImageryExtent.North;
}
if (height > 0)
{
ClipmapUpdate horizontalUpdate = new ClipmapUpdate(
level,
level.NextImageryExtent.West,
minLatitude,
level.NextImageryExtent.East,
maxLatitude);
_updater.UpdateImagery(context, horizontalUpdate);
}
if (width > 0)
{
ClipmapUpdate verticalUpdate = new ClipmapUpdate(
level,
minLongitude,
level.NextImageryExtent.South,
maxLongitude,
level.NextImageryExtent.North);
_updater.UpdateImagery(context, verticalUpdate);
}
level.CurrentImageryExtent.West = level.NextImageryExtent.West;
level.CurrentImageryExtent.South = level.NextImageryExtent.South;
level.CurrentImageryExtent.East = level.NextImageryExtent.East;
level.CurrentImageryExtent.North = level.NextImageryExtent.North;
}
public void Render(Context context, SceneState sceneState)
{
if (_wireframe)
{
_renderState.RasterizationMode = RasterizationMode.Line;
}
else
{
_renderState.RasterizationMode = RasterizationMode.Fill;
}
Vector3D previousTarget = sceneState.Camera.Target;
Vector3D previousEye = sceneState.Camera.Eye;
Vector3D previousSun = sceneState.SunPosition;
_levelZeroWorldScaleFactor.Value = new Vector2F((float)_clipmapLevels[0].Terrain.PostDeltaLongitude, (float)_clipmapLevels[0].Terrain.PostDeltaLatitude);
int maxLevel = _clipmapLevels.Length - 1;
Vector2D center = new Vector2D(0.0, 0.0);
bool rendered = false;
for (int i = maxLevel; i >= 0; --i)
{
ClipmapLevel thisLevel = _clipmapLevels[i];
ClipmapLevel coarserLevel = _clipmapLevels[i > 0 ? i - 1 : 0];
rendered = RenderLevel(i, thisLevel, coarserLevel, !rendered, center, context, sceneState);
}
sceneState.Camera.Target = previousTarget;
sceneState.Camera.Eye = previousEye;
sceneState.SunPosition = previousSun;
}
private void UpdateImageryOriginInTextures(ClipmapLevel level)
{
int deltaX = level.NextImageryExtent.West - level.CurrentImageryExtent.West;
int deltaY = level.NextImageryExtent.South - level.CurrentImageryExtent.South;
if (deltaX == 0 && deltaY == 0)
{
return;
}
if (level.CurrentImageryExtent.West > level.CurrentImageryExtent.East || // initial update
Math.Abs(deltaX) >= level.ImageryWidth || Math.Abs(deltaY) >= level.ImageryHeight) // complete update
{
level.OriginInImagery = new Vector2I(0, 0);
}
else
{
int newOriginX = (level.OriginInImagery.X + deltaX) % level.ImageryWidth;
if (newOriginX < 0)
{
newOriginX += level.ImageryWidth;
}
int newOriginY = (level.OriginInImagery.Y + deltaY) % level.ImageryHeight;
if (newOriginY < 0)
{
newOriginY += level.ImageryHeight;
}
level.OriginInImagery = new Vector2I(newOriginX, newOriginY);
}
}
private void UpdateOriginInTextures(ClipmapLevel level)
{
int deltaX = level.NextExtent.West - level.CurrentExtent.West;
int deltaY = level.NextExtent.South - level.CurrentExtent.South;
if (deltaX == 0 && deltaY == 0)
{
return;
}
if (level.CurrentExtent.West > level.CurrentExtent.East || // initial update
Math.Abs(deltaX) >= _clipmapPosts || Math.Abs(deltaY) >= _clipmapPosts) // complete update
{
level.OriginInTextures = new Vector2I(0, 0);
}
else
{
int newOriginX = (level.OriginInTextures.X + deltaX) % _clipmapPosts;
if (newOriginX < 0)
{
newOriginX += _clipmapPosts;
}
int newOriginY = (level.OriginInTextures.Y + deltaY) % _clipmapPosts;
if (newOriginY < 0)
{
newOriginY += _clipmapPosts;
}
level.OriginInTextures = new Vector2I(newOriginX, newOriginY);
}
}
private void UpdateNormals(Context context, ClipmapUpdate update)
{
ClipmapLevel level = update.Level;
context.TextureUnits[0].Texture = update.Level.HeightTexture;
context.TextureUnits[0].TextureSampler = Device.TextureSamplers.NearestRepeat;
_framebuffer.ColorAttachments[_normalOutput] = level.NormalTexture;
int clipmapSize = level.NextExtent.East - level.NextExtent.West + 1;
int west = (level.OriginInTextures.X + (update.West - level.NextExtent.West)) % clipmapSize;
int south = (level.OriginInTextures.Y + (update.South - level.NextExtent.South)) % clipmapSize;
_computeNormalsUpdateSize.Value = new Vector2F(update.Width, update.Height);
_computeNormalsOrigin.Value = new Vector2F(west, south);
_computeNormalsOneOverHeightMapSize.Value = new Vector2F(1.0f / update.Level.HeightTexture.Description.Width, 1.0f / update.Level.HeightTexture.Description.Height);
_postDelta.Value = (float)update.Level.Terrain.PostDeltaLongitude;
// Save the current state of the context
Rectangle oldViewport = context.Viewport;
Framebuffer oldFramebuffer = context.Framebuffer;
// Update the context and draw
context.Viewport = new Rectangle(0, 0, level.NormalTexture.Description.Width, level.NormalTexture.Description.Height);
context.Framebuffer = _framebuffer;
context.Draw(_unitQuadPrimitiveType, _computeNormalsDrawState, _sceneState);
// Restore the context to its original state
context.Framebuffer = oldFramebuffer;
context.Viewport = oldViewport;
}
public ClipmapUpdate(ClipmapLevel level, int west, int south, int east, int north)
{
_level = level;
_west = west;
_south = south;
_east = east;
_north = north;
}
public ClipmapUpdate(ClipmapLevel level, int west, int south, int east, int north)
{
_level = level;
_west = west;
_south = south;
_east = east;
_north = north;
}
private void ApplyIfNotLoaded(Context context, RasterDataDetails details, ClipmapLevel level, RasterTile tile)
{
Texture2D texture;
if (!details.LoadedTiles.TryGetValue(tile.Identifier, out texture) || texture == null)
{
ApplyNewTile(context, details, level, tile);
}
}
public ClipmapUpdater(Context context, ClipmapLevel[] clipmapLevels)
{
ShaderVertexAttributeCollection vertexAttributes = new ShaderVertexAttributeCollection();
vertexAttributes.Add(new ShaderVertexAttribute("position", VertexLocations.Position, ShaderVertexAttributeType.FloatVector2, 1));
Mesh unitQuad = RectangleTessellator.Compute(new RectangleD(new Vector2D(0.0, 0.0), new Vector2D(1.0, 1.0)), 1, 1);
_unitQuad = context.CreateVertexArray(unitQuad, vertexAttributes, BufferHint.StaticDraw);
_unitQuadPrimitiveType = unitQuad.PrimitiveType;
_sceneState = new SceneState();
_framebuffer = context.CreateFramebuffer();
_updateShader = Device.CreateShaderProgram(
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.ClipmapTerrain.ClipmapUpdateVS.glsl"),
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.ClipmapTerrain.ClipmapUpdateFS.glsl"));
_updateTexelOutput = _updateShader.FragmentOutputs["texelOutput"];
_updateDrawState = new DrawState(new RenderState(), _updateShader, _unitQuad);
_updateDrawState.RenderState.FacetCulling.FrontFaceWindingOrder = unitQuad.FrontFaceWindingOrder;
_updateDrawState.RenderState.DepthTest.Enabled = false;
_updateDestinationOffset = (Uniform <Vector2F>)_updateShader.Uniforms["u_destinationOffset"];
_updateUpdateSize = (Uniform <Vector2F>)_updateShader.Uniforms["u_updateSize"];
_updateSourceOrigin = (Uniform <Vector2F>)_updateShader.Uniforms["u_sourceOrigin"];
_upsampleShader = Device.CreateShaderProgram(
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.ClipmapTerrain.ClipmapUpsampleVS.glsl"),
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.ClipmapTerrain.ClipmapUpsampleFS.glsl"));
_upsampleTexelOutput = _upsampleShader.FragmentOutputs["texelOutput"];
_upsampleDrawState = new DrawState(new RenderState(), _upsampleShader, _unitQuad);
_upsampleDrawState.RenderState.FacetCulling.FrontFaceWindingOrder = unitQuad.FrontFaceWindingOrder;
_upsampleDrawState.RenderState.DepthTest.Enabled = false;
_upsampleSourceOrigin = (Uniform <Vector2F>)_upsampleShader.Uniforms["u_sourceOrigin"];
_upsampleUpdateSize = (Uniform <Vector2F>)_upsampleShader.Uniforms["u_updateSize"];
_upsampleDestinationOffset = (Uniform <Vector2F>)_upsampleShader.Uniforms["u_destinationOffset"];
_upsampleOneOverTextureSize = (Uniform <Vector2F>)_upsampleShader.Uniforms["u_oneOverTextureSize"];
_computeNormalsShader = Device.CreateShaderProgram(
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.ClipmapTerrain.ClipmapComputeNormalsVS.glsl"),
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.ClipmapTerrain.ClipmapComputeNormalsFS.glsl"));
_normalOutput = _computeNormalsShader.FragmentOutputs["normalOutput"];
_computeNormalsDrawState = new DrawState(new RenderState(), _computeNormalsShader, _unitQuad);
_computeNormalsDrawState.RenderState.FacetCulling.FrontFaceWindingOrder = unitQuad.FrontFaceWindingOrder;
_computeNormalsDrawState.RenderState.DepthTest.Enabled = false;
_computeNormalsOrigin = (Uniform <Vector2F>)_computeNormalsShader.Uniforms["u_origin"];
_computeNormalsUpdateSize = (Uniform <Vector2F>)_computeNormalsShader.Uniforms["u_updateSize"];
_computeNormalsOneOverHeightMapSize = (Uniform <Vector2F>)_computeNormalsShader.Uniforms["u_oneOverHeightMapSize"];
_heightExaggeration = (Uniform <float>)_computeNormalsShader.Uniforms["u_heightExaggeration"];
_postDelta = (Uniform <float>)_computeNormalsShader.Uniforms["u_postDelta"];
HeightExaggeration = 1.0f;
ClipmapLevel levelZero = clipmapLevels[0];
InitializeRequestThreads(context, _terrain, levelZero, levelZero.Terrain);
InitializeRequestThreads(context, _imagery, levelZero, levelZero.Imagery);
}
private void DrawBlock(VertexArray block, ClipmapLevel level, ClipmapLevel coarserLevel, int overallWest, int overallSouth, int blockWest, int blockSouth, Context context, SceneState sceneState)
{
int textureWest = blockWest - overallWest;
int textureSouth = blockSouth - overallSouth;
_patchOriginInClippedLevel.Value = new Vector2F(textureWest, textureSouth);
DrawState drawState = new DrawState(_renderState, _shaderProgram, block);
context.Draw(_primitiveType, drawState, sceneState);
}
private void RequestTileResidency(Context context, ClipmapLevel level, RasterDataDetails details, RasterLevel rasterLevel, ClipmapLevel.Extent nextExtent)
{
RasterTileRegion[] tileRegions = rasterLevel.GetTilesInExtent(nextExtent.West, nextExtent.South, nextExtent.East, nextExtent.North);
foreach (RasterTileRegion region in tileRegions)
{
if (!details.LoadedTiles.ContainsKey(region.Tile.Identifier))
{
RequestTileLoad(details, level, region.Tile);
}
}
}
public ClipmapUpdater(Context context, ClipmapLevel[] clipmapLevels)
{
ShaderVertexAttributeCollection vertexAttributes = new ShaderVertexAttributeCollection();
vertexAttributes.Add(new ShaderVertexAttribute("position", VertexLocations.Position, ShaderVertexAttributeType.FloatVector2, 1));
Mesh unitQuad = RectangleTessellator.Compute(new RectangleD(new Vector2D(0.0, 0.0), new Vector2D(1.0, 1.0)), 1, 1);
_unitQuad = context.CreateVertexArray(unitQuad, vertexAttributes, BufferHint.StaticDraw);
_unitQuadPrimitiveType = unitQuad.PrimitiveType;
_sceneState = new SceneState();
_framebuffer = context.CreateFramebuffer();
_updateShader = Device.CreateShaderProgram(
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.ClipmapTerrain.ClipmapUpdateVS.glsl"),
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.ClipmapTerrain.ClipmapUpdateFS.glsl"));
_updateTexelOutput = _updateShader.FragmentOutputs["texelOutput"];
_updateDrawState = new DrawState(new RenderState(), _updateShader, _unitQuad);
_updateDrawState.RenderState.FacetCulling.FrontFaceWindingOrder = unitQuad.FrontFaceWindingOrder;
_updateDrawState.RenderState.DepthTest.Enabled = false;
_updateDestinationOffset = (Uniform<Vector2F>)_updateShader.Uniforms["u_destinationOffset"];
_updateUpdateSize = (Uniform<Vector2F>)_updateShader.Uniforms["u_updateSize"];
_updateSourceOrigin = (Uniform<Vector2F>)_updateShader.Uniforms["u_sourceOrigin"];
_upsampleShader = Device.CreateShaderProgram(
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.ClipmapTerrain.ClipmapUpsampleVS.glsl"),
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.ClipmapTerrain.ClipmapUpsampleFS.glsl"));
_upsampleTexelOutput = _upsampleShader.FragmentOutputs["texelOutput"];
_upsampleDrawState = new DrawState(new RenderState(), _upsampleShader, _unitQuad);
_upsampleDrawState.RenderState.FacetCulling.FrontFaceWindingOrder = unitQuad.FrontFaceWindingOrder;
_upsampleDrawState.RenderState.DepthTest.Enabled = false;
_upsampleSourceOrigin = (Uniform<Vector2F>)_upsampleShader.Uniforms["u_sourceOrigin"];
_upsampleUpdateSize = (Uniform<Vector2F>)_upsampleShader.Uniforms["u_updateSize"];
_upsampleDestinationOffset = (Uniform<Vector2F>)_upsampleShader.Uniforms["u_destinationOffset"];
_upsampleOneOverTextureSize = (Uniform<Vector2F>)_upsampleShader.Uniforms["u_oneOverTextureSize"];
_computeNormalsShader = Device.CreateShaderProgram(
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.ClipmapTerrain.ClipmapComputeNormalsVS.glsl"),
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.ClipmapTerrain.ClipmapComputeNormalsFS.glsl"));
_normalOutput = _computeNormalsShader.FragmentOutputs["normalOutput"];
_computeNormalsDrawState = new DrawState(new RenderState(), _computeNormalsShader, _unitQuad);
_computeNormalsDrawState.RenderState.FacetCulling.FrontFaceWindingOrder = unitQuad.FrontFaceWindingOrder;
_computeNormalsDrawState.RenderState.DepthTest.Enabled = false;
_computeNormalsOrigin = (Uniform<Vector2F>)_computeNormalsShader.Uniforms["u_origin"];
_computeNormalsUpdateSize = (Uniform<Vector2F>)_computeNormalsShader.Uniforms["u_updateSize"];
_computeNormalsOneOverHeightMapSize = (Uniform<Vector2F>)_computeNormalsShader.Uniforms["u_oneOverHeightMapSize"];
_heightExaggeration = (Uniform<float>)_computeNormalsShader.Uniforms["u_heightExaggeration"];
_postDelta = (Uniform<float>)_computeNormalsShader.Uniforms["u_postDelta"];
HeightExaggeration = 1.0f;
ClipmapLevel levelZero = clipmapLevels[0];
InitializeRequestThreads(context, _terrain, levelZero, levelZero.Terrain);
InitializeRequestThreads(context, _imagery, levelZero, levelZero.Imagery);
}
private void RequestTileLoad(RasterDataDetails details, ClipmapLevel level, RasterTile tile)
{
LinkedListNode <TileLoadRequest> requestNode;
bool exists = details.LoadingTiles.TryGetValue(tile.Identifier, out requestNode);
if (!exists)
{
// Create a new request.
TileLoadRequest request = new TileLoadRequest();
request.Level = level;
request.Tile = tile;
requestNode = new LinkedListNode <TileLoadRequest>(request);
}
lock (details.RequestList)
{
if (exists)
{
// Remove the existing request from the queue so we can re-insert it
// in its new location.
if (requestNode.List == null)
{
// Request was in the queue at one point, but it's not anymore.
// That means it's been loaded, so we don't need to do anything.
return;
}
details.RequestList.Remove(requestNode);
}
if (details.RequestInsertionPoint == null || details.RequestInsertionPoint.List == null)
{
details.RequestList.AddLast(requestNode);
}
else
{
details.RequestList.AddBefore(details.RequestInsertionPoint, requestNode);
}
details.RequestInsertionPoint = requestNode;
// If the request list has too many entries, delete from the beginning
const int MaxRequests = 500;
while (details.RequestList.Count > MaxRequests)
{
LinkedListNode <TileLoadRequest> nodeToRemove = details.RequestList.First;
details.RequestList.RemoveFirst();
details.LoadingTiles.Remove(nodeToRemove.Value.Tile.Identifier);
}
Monitor.Pulse(details.RequestList);
}
details.LoadingTiles[tile.Identifier] = requestNode;
}
private void RenderTileToLevelTexture(Context context, ClipmapLevel level, RasterDataDetails details, RasterTileRegion region, Texture2D tileTexture)
{
Texture2D levelTexture;
Vector2I originInTextures;
ClipmapLevel.Extent nextExtent;
if (details.Type == RasterType.Terrain)
{
levelTexture = level.HeightTexture;
originInTextures = level.OriginInTextures;
nextExtent = level.NextExtent;
}
else
{
levelTexture = level.ImageryTexture;
originInTextures = level.OriginInImagery;
nextExtent = level.NextImageryExtent;
}
context.TextureUnits[0].Texture = tileTexture;
context.TextureUnits[0].TextureSampler = Device.TextureSamplers.NearestClamp;
_framebuffer.ColorAttachments[_updateTexelOutput] = levelTexture;
int clipmapSize = nextExtent.East - nextExtent.West + 1;
int destWest = (originInTextures.X + (region.Tile.West + region.West - nextExtent.West)) % clipmapSize;
int destSouth = (originInTextures.Y + (region.Tile.South + region.South - nextExtent.South)) % clipmapSize;
int width = region.East - region.West + 1;
int height = region.North - region.South + 1;
_updateSourceOrigin.Value = new Vector2F(region.West, region.South);
_updateUpdateSize.Value = new Vector2F(width, height);
_updateDestinationOffset.Value = new Vector2F(destWest, destSouth);
// Save the current state of the context
Rectangle oldViewport = context.Viewport;
Framebuffer oldFramebuffer = context.Framebuffer;
// Update the context and draw
context.Viewport = new Rectangle(0, 0, levelTexture.Description.Width, levelTexture.Description.Height);
context.Framebuffer = _framebuffer;
context.Draw(_unitQuadPrimitiveType, _updateDrawState, _sceneState);
// Restore the context to its original state
context.Framebuffer = oldFramebuffer;
context.Viewport = oldViewport;
}
private void InitializeRequestThreads(Context context, RasterDataDetails details, ClipmapLevel clipmapLevelZero, RasterLevel rasterLevelZero)
{
details.WorkerWindow = Device.CreateWindow(1, 1);
context.MakeCurrent();
#if !SingleThreaded
Thread requestThread = new Thread(RequestThreadEntryPoint);
requestThread.IsBackground = true;
requestThread.Start(details);
#endif
// Preload the entire world at level 0
RasterTileRegion[] regions = rasterLevelZero.GetTilesInExtent(0, 0, rasterLevelZero.LongitudePosts - 1, rasterLevelZero.LatitudePosts - 1);
foreach (RasterTileRegion region in regions)
{
RequestTileLoad(details, clipmapLevelZero, region.Tile);
}
}
private void ApplyNewTile(Context context, RasterDataDetails details, ClipmapLevel level, RasterTile tile)
{
ClipmapLevel.Extent nextExtent = details.Type == RasterType.Terrain ? level.NextExtent : level.NextImageryExtent;
RasterLevel rasterLevel = details.Type == RasterType.Terrain ? level.Terrain : level.Imagery;
ClipmapUpdate entireLevel = new ClipmapUpdate(
level,
nextExtent.West,
nextExtent.South,
nextExtent.East,
nextExtent.North);
ClipmapUpdate thisTile = new ClipmapUpdate(
level,
tile.West - 1,
tile.South - 1,
tile.East + 1,
tile.North + 1);
ClipmapUpdate intersection = IntersectUpdates(entireLevel, thisTile);
if (intersection.Width > 0 && intersection.Height > 0)
{
Update(context, intersection, level, details, rasterLevel);
// Recurse on child tiles if they're NOT loaded. Unloaded children will use data from this tile.
ClipmapLevel finer = level.FinerLevel;
if (finer != null)
{
ApplyIfNotLoaded(context, details, finer, tile.SouthwestChild);
ApplyIfNotLoaded(context, details, finer, tile.SoutheastChild);
ApplyIfNotLoaded(context, details, finer, tile.NorthwestChild);
ApplyIfNotLoaded(context, details, finer, tile.NortheastChild);
}
}
}
private ClipmapUpdate[] SplitUpdateToAvoidWrapping(ClipmapUpdate update, RasterDataDetails details)
{
ClipmapLevel level = update.Level;
Vector2I origin = details.Type == RasterType.Terrain ? level.OriginInTextures : level.OriginInImagery;
ClipmapLevel.Extent extent = details.Type == RasterType.Terrain ? level.NextExtent : level.NextImageryExtent;
int clipmapSizeX = extent.East - extent.West + 1;
int clipmapSizeY = extent.North - extent.South + 1;
int west = (origin.X + (update.West - extent.West)) % clipmapSizeX;
int east = (origin.X + (update.East - extent.West)) % clipmapSizeX;
int south = (origin.Y + (update.South - extent.South)) % clipmapSizeY;
int north = (origin.Y + (update.North - extent.South)) % clipmapSizeY;
if (east < west && north < south)
{
// Horizontal AND vertical wrap
ClipmapUpdate bottomLeftUpdate = new ClipmapUpdate(
level,
update.West,
update.South,
extent.West + (clipmapSizeX - origin.X - 1),
extent.South + (clipmapSizeY - origin.Y - 1));
ClipmapUpdate bottomRightUpdate = new ClipmapUpdate(
level,
extent.West + clipmapSizeX - origin.X,
update.South,
update.East,
extent.South + (clipmapSizeY - origin.Y - 1));
ClipmapUpdate topLeftUpdate = new ClipmapUpdate(
level,
update.West,
extent.South + clipmapSizeY - origin.Y,
extent.West + (clipmapSizeX - origin.X - 1),
update.North);
ClipmapUpdate topRightUpdate = new ClipmapUpdate(
level,
extent.West + clipmapSizeX - origin.X,
extent.South + clipmapSizeY - origin.Y,
update.East,
update.North);
ClipmapUpdate[] result = new ClipmapUpdate[4];
result[0] = bottomLeftUpdate;
result[1] = bottomRightUpdate;
result[2] = topLeftUpdate;
result[3] = topRightUpdate;
return(result);
}
else if (east < west)
{
// Horizontal wrap
ClipmapUpdate leftUpdate = new ClipmapUpdate(
level,
update.West,
update.South,
extent.West + (clipmapSizeX - origin.X - 1),
update.North);
ClipmapUpdate rightUpdate = new ClipmapUpdate(
level,
extent.West + clipmapSizeX - origin.X,
update.South,
update.East,
update.North);
ClipmapUpdate[] result = new ClipmapUpdate[2];
result[0] = leftUpdate;
result[1] = rightUpdate;
return(result);
}
else if (north < south)
{
// Vertical wrap
ClipmapUpdate bottomUpdate = new ClipmapUpdate(
level,
update.West,
update.South,
update.East,
extent.South + (clipmapSizeY - origin.Y - 1));
ClipmapUpdate topUpdate = new ClipmapUpdate(
level,
update.West,
extent.South + clipmapSizeY - origin.Y,
update.East,
update.North);
ClipmapUpdate[] result = new ClipmapUpdate[2];
result[0] = bottomUpdate;
result[1] = topUpdate;
return(result);
}
else
{
// No wrap
ClipmapUpdate[] result = new ClipmapUpdate[1];
result[0] = update;
return(result);
}
}
public void RequestTileResidency(Context context, ClipmapLevel level)
{
RequestTileResidency(context, level, _terrain, level.Terrain, level.NextExtent);
RequestTileResidency(context, level, _imagery, level.Imagery, level.NextImageryExtent);
}
public void UpdateImagery(Context context, ClipmapUpdate update)
{
ClipmapLevel level = update.Level;
Update(context, update, level, _imagery, level.Imagery);
}
private bool RenderLevel(int levelIndex, ClipmapLevel level, ClipmapLevel coarserLevel, bool fillRing, Vector2D center, Context context, SceneState sceneState)
{
context.TextureUnits[0].Texture = level.HeightTexture;
context.TextureUnits[0].TextureSampler = Device.TextureSamplers.NearestRepeat;
context.TextureUnits[1].Texture = coarserLevel.HeightTexture;
context.TextureUnits[1].TextureSampler = Device.TextureSamplers.LinearRepeat;
context.TextureUnits[2].Texture = level.NormalTexture;
context.TextureUnits[2].TextureSampler = Device.TextureSamplers.LinearRepeat;
context.TextureUnits[3].Texture = coarserLevel.NormalTexture;
context.TextureUnits[3].TextureSampler = Device.TextureSamplers.LinearRepeat;
context.TextureUnits[4].Texture = level.ImageryTexture;
context.TextureUnits[4].TextureSampler = Device.TextureSamplers.LinearRepeat;
if (_colorClipmapLevels)
{
_color.Value = _colors[levelIndex];
_blendRegionColor.Value = levelIndex == 0 ? _colors[levelIndex] : _colors[levelIndex - 1];
}
else
{
_color.Value = new Vector3F(0.0f, 1.0f, 0.0f);
_blendRegionColor.Value = new Vector3F(0.0f, 0.0f, 1.0f);
}
int west = level.CurrentExtent.West;
int south = level.CurrentExtent.South;
int east = level.CurrentExtent.East;
int north = level.CurrentExtent.North;
float levelScaleFactor = (float)Math.Pow(2.0, -levelIndex);
_levelScaleFactor.Value = new Vector2F(levelScaleFactor, levelScaleFactor);
_levelOffsetFromWorldOrigin.Value = new Vector2F((float)((double)level.CurrentExtent.West - level.Terrain.LongitudeToIndex(0.0)),
(float)((double)level.CurrentExtent.South - level.Terrain.LatitudeToIndex(0.0)));
int coarserWest = coarserLevel.CurrentExtent.West;
int coarserSouth = coarserLevel.CurrentExtent.South;
_fineLevelOriginInCoarse.Value = coarserLevel.OriginInTextures.ToVector2F() +
new Vector2F(west / 2 - coarserWest + 0.5f,
south / 2 - coarserSouth + 0.5f);
_viewPosInClippedLevel.Value = new Vector2F((float)(level.Terrain.LongitudeToIndex(Trig.ToDegrees(_clipmapCenter.Longitude)) - level.CurrentExtent.West),
(float)(level.Terrain.LatitudeToIndex(Trig.ToDegrees(_clipmapCenter.Latitude)) - level.CurrentExtent.South));
_fineTextureOrigin.Value = level.OriginInTextures.ToVector2F() + new Vector2F(0.5f, 0.5f);
_useBlendRegions.Value = _blendRegionsEnabled && level != coarserLevel;
_terrainToImageryResolutionRatio.Value = new Vector2F((float)(level.Terrain.PostDeltaLongitude / level.Imagery.PostDeltaLongitude),
(float)(level.Terrain.PostDeltaLatitude / level.Imagery.PostDeltaLatitude));
double terrainWest = level.Terrain.IndexToLongitude(level.CurrentExtent.West);
double terrainSouth = level.Terrain.IndexToLatitude(level.CurrentExtent.South);
double imageryWestIndex = level.Imagery.LongitudeToIndex(terrainWest);
double imagerySouthIndex = level.Imagery.LatitudeToIndex(terrainSouth);
Vector2D terrainOffsetInImagery = level.OriginInImagery.ToVector2D() +
new Vector2D(imageryWestIndex - level.CurrentImageryExtent.West,
imagerySouthIndex - level.CurrentImageryExtent.South);
_terrainOffsetInImagery.Value = terrainOffsetInImagery.ToVector2F();
_oneOverImagerySize.Value = new Vector2F((float)(1.0 / level.ImageryWidth), (float)(1.0 / level.ImageryHeight));
DrawBlock(_fillPatch, level, coarserLevel, west, south, west, south, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, west + _fillPatchSegments, south, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, east - 2 * _fillPatchSegments, south, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, east - _fillPatchSegments, south, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, west, south + _fillPatchSegments, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, east - _fillPatchSegments, south + _fillPatchSegments, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, west, north - 2 * _fillPatchSegments, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, east - _fillPatchSegments, north - 2 * _fillPatchSegments, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, west, north - _fillPatchSegments, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, west + _fillPatchSegments, north - _fillPatchSegments, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, east - 2 * _fillPatchSegments, north - _fillPatchSegments, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, east - _fillPatchSegments, north - _fillPatchSegments, context, sceneState);
DrawBlock(_horizontalFixupPatch, level, coarserLevel, west, south, west, south + 2 * _fillPatchSegments, context, sceneState);
DrawBlock(_horizontalFixupPatch, level, coarserLevel, west, south, east - _fillPatchSegments, south + 2 * _fillPatchSegments, context, sceneState);
DrawBlock(_verticalFixupPatch, level, coarserLevel, west, south, west + 2 * _fillPatchSegments, south, context, sceneState);
DrawBlock(_verticalFixupPatch, level, coarserLevel, west, south, west + 2 * _fillPatchSegments, north - _fillPatchSegments, context, sceneState);
DrawBlock(_degenerateTrianglePatch, level, coarserLevel, west, south, west, south, context, sceneState);
// Fill the center of the highest-detail ring
if (fillRing)
{
DrawBlock(_fillPatch, level, coarserLevel, west, south, west + _fillPatchSegments, south + _fillPatchSegments, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, west + 2 * _fillPatchPosts, south + _fillPatchSegments, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, west + _fillPatchSegments, south + 2 * _fillPatchPosts, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, west + 2 * _fillPatchPosts, south + 2 * _fillPatchPosts, context, sceneState);
DrawBlock(_horizontalFixupPatch, level, coarserLevel, west, south, west + _fillPatchSegments, south + 2 * _fillPatchSegments, context, sceneState);
DrawBlock(_horizontalFixupPatch, level, coarserLevel, west, south, west + 2 * _fillPatchPosts, south + 2 * _fillPatchSegments, context, sceneState);
DrawBlock(_verticalFixupPatch, level, coarserLevel, west, south, west + 2 * _fillPatchSegments, south + _fillPatchSegments, context, sceneState);
DrawBlock(_verticalFixupPatch, level, coarserLevel, west, south, west + 2 * _fillPatchSegments, south + 2 * _fillPatchPosts, context, sceneState);
DrawBlock(_centerPatch, level, coarserLevel, west, south, west + 2 * _fillPatchSegments, south + 2 * _fillPatchSegments, context, sceneState);
}
else
{
int offset = level.OffsetStripOnNorth
? north - _fillPatchPosts
: south + _fillPatchSegments;
DrawBlock(_horizontalOffsetPatch, level, coarserLevel, west, south, west + _fillPatchSegments, offset, context, sceneState);
int southOffset = level.OffsetStripOnNorth ? 0 : 1;
offset = level.OffsetStripOnEast
? east - _fillPatchPosts
: west + _fillPatchSegments;
DrawBlock(_verticalOffsetPatch, level, coarserLevel, west, south, offset, south + _fillPatchSegments + southOffset, context, sceneState);
}
return(true);
}
private void UpdateImageryOriginInTextures(ClipmapLevel level)
{
int deltaX = level.NextImageryExtent.West - level.CurrentImageryExtent.West;
int deltaY = level.NextImageryExtent.South - level.CurrentImageryExtent.South;
if (deltaX == 0 && deltaY == 0)
return;
if (level.CurrentImageryExtent.West > level.CurrentImageryExtent.East || // initial update
Math.Abs(deltaX) >= level.ImageryWidth || Math.Abs(deltaY) >= level.ImageryHeight) // complete update
{
level.OriginInImagery = new Vector2I(0, 0);
}
else
{
int newOriginX = (level.OriginInImagery.X + deltaX) % level.ImageryWidth;
if (newOriginX < 0)
newOriginX += level.ImageryWidth;
int newOriginY = (level.OriginInImagery.Y + deltaY) % level.ImageryHeight;
if (newOriginY < 0)
newOriginY += level.ImageryHeight;
level.OriginInImagery = new Vector2I(newOriginX, newOriginY);
}
}
private void Update(Context context, ClipmapUpdate update, ClipmapLevel level, RasterDataDetails details, RasterLevel rasterLevel)
{
ClipmapUpdate[] updates = SplitUpdateToAvoidWrapping(update, details);
foreach (ClipmapUpdate nonWrappingUpdate in updates)
{
RasterTileRegion[] tileRegions = rasterLevel.GetTilesInExtent(nonWrappingUpdate.West, nonWrappingUpdate.South, nonWrappingUpdate.East, nonWrappingUpdate.North);
foreach (RasterTileRegion region in tileRegions)
{
Texture2D tileTexture;
bool loaded = details.LoadedTiles.TryGetValue(region.Tile.Identifier, out tileTexture);
if (loaded)
{
RenderTileToLevelTexture(context, level, details, region, tileTexture);
}
else
{
UpsampleTileData(context, level, details, region);
}
}
}
if (details.Type == RasterType.Terrain)
{
// Normals at edges are incorrect, so include a one-post buffer around the update region
// when updating normals in order to update normals that were previously at the edge.
ClipmapUpdate updateWithBuffer = update.AddBufferWithinLevelNextExtent();
ClipmapUpdate[] normalUpdates = SplitUpdateToAvoidWrapping(updateWithBuffer, details);
foreach (ClipmapUpdate normalUpdate in normalUpdates)
{
UpdateNormals(context, normalUpdate);
}
}
}
private void RenderTileToLevelTexture(Context context, ClipmapLevel level, RasterDataDetails details, RasterTileRegion region, Texture2D tileTexture)
{
Texture2D levelTexture;
Vector2I originInTextures;
ClipmapLevel.Extent nextExtent;
if (details.Type == RasterType.Terrain)
{
levelTexture = level.HeightTexture;
originInTextures = level.OriginInTextures;
nextExtent = level.NextExtent;
}
else
{
levelTexture = level.ImageryTexture;
originInTextures = level.OriginInImagery;
nextExtent = level.NextImageryExtent;
}
context.TextureUnits[0].Texture = tileTexture;
context.TextureUnits[0].TextureSampler = Device.TextureSamplers.NearestClamp;
_framebuffer.ColorAttachments[_updateTexelOutput] = levelTexture;
int clipmapSize = nextExtent.East - nextExtent.West + 1;
int destWest = (originInTextures.X + (region.Tile.West + region.West - nextExtent.West)) % clipmapSize;
int destSouth = (originInTextures.Y + (region.Tile.South + region.South - nextExtent.South)) % clipmapSize;
int width = region.East - region.West + 1;
int height = region.North - region.South + 1;
_updateSourceOrigin.Value = new Vector2F(region.West, region.South);
_updateUpdateSize.Value = new Vector2F(width, height);
_updateDestinationOffset.Value = new Vector2F(destWest, destSouth);
// Save the current state of the context
Rectangle oldViewport = context.Viewport;
Framebuffer oldFramebuffer = context.Framebuffer;
// Update the context and draw
context.Viewport = new Rectangle(0, 0, levelTexture.Description.Width, levelTexture.Description.Height);
context.Framebuffer = _framebuffer;
context.Draw(_unitQuadPrimitiveType, _updateDrawState, _sceneState);
// Restore the context to its original state
context.Framebuffer = oldFramebuffer;
context.Viewport = oldViewport;
}
public GlobeClipmapTerrain(Context context, RasterSource terrainSource, EsriRestImagery imagery, Ellipsoid ellipsoid, int clipmapPosts)
{
_terrainSource = terrainSource;
_ellipsoid = ellipsoid;
_clipmapPosts = clipmapPosts;
_clipmapSegments = _clipmapPosts - 1;
int clipmapLevels = _terrainSource.Levels.Count;
_clipmapLevels = new ClipmapLevel[clipmapLevels];
for (int i = 0; i < _clipmapLevels.Length; ++i)
{
_clipmapLevels[i] = new ClipmapLevel();
}
for (int i = 0; i < _clipmapLevels.Length; ++i)
{
RasterLevel terrainLevel = _terrainSource.Levels[i];
_clipmapLevels[i].Terrain = terrainLevel;
_clipmapLevels[i].HeightTexture = Device.CreateTexture2D(new Texture2DDescription(_clipmapPosts, _clipmapPosts, TextureFormat.Red32f));
_clipmapLevels[i].NormalTexture = Device.CreateTexture2D(new Texture2DDescription(_clipmapPosts, _clipmapPosts, TextureFormat.RedGreenBlue32f));
_clipmapLevels[i].CoarserLevel = i == 0 ? null : _clipmapLevels[i - 1];
_clipmapLevels[i].FinerLevel = i == _clipmapLevels.Length - 1 ? null : _clipmapLevels[i + 1];
// Aim for roughly one imagery texel per geometry texel.
// Find the first imagery level that meets our resolution needs.
double longitudeResRequired = terrainLevel.PostDeltaLongitude;
double latitudeResRequired = terrainLevel.PostDeltaLatitude;
RasterLevel imageryLevel = null;
for (int j = 0; j < imagery.Levels.Count; ++j)
{
imageryLevel = imagery.Levels[j];
if (imageryLevel.PostDeltaLongitude <= longitudeResRequired &&
imageryLevel.PostDeltaLatitude <= latitudeResRequired)
{
break;
}
}
_clipmapLevels[i].Imagery = imageryLevel;
_clipmapLevels[i].ImageryWidth = (int)Math.Ceiling(_clipmapPosts * terrainLevel.PostDeltaLongitude / imageryLevel.PostDeltaLongitude);
_clipmapLevels[i].ImageryHeight = (int)Math.Ceiling(_clipmapPosts * terrainLevel.PostDeltaLatitude / imageryLevel.PostDeltaLatitude);
_clipmapLevels[i].ImageryTexture = Device.CreateTexture2D(new Texture2DDescription(_clipmapLevels[i].ImageryWidth, _clipmapLevels[i].ImageryHeight, TextureFormat.RedGreenBlue8, false));
}
_shaderProgram = Device.CreateShaderProgram(
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.ClipmapTerrain.GlobeClipmapVS.glsl"),
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.ClipmapTerrain.GlobeClipmapFS.glsl"));
_fillPatchPosts = (clipmapPosts + 1) / 4; // M
_fillPatchSegments = _fillPatchPosts - 1;
// Create the MxM block used to fill the ring and the field.
Mesh fieldBlockMesh = RectangleTessellator.Compute(
new RectangleD(new Vector2D(0.0, 0.0), new Vector2D(_fillPatchSegments, _fillPatchSegments)),
_fillPatchSegments, _fillPatchSegments);
_fillPatch = context.CreateVertexArray(fieldBlockMesh, _shaderProgram.VertexAttributes, BufferHint.StaticDraw);
// Create the Mx3 block used to fill the space between the MxM blocks in the ring
Mesh ringFixupHorizontalMesh = RectangleTessellator.Compute(
new RectangleD(new Vector2D(0.0, 0.0), new Vector2D(_fillPatchSegments, 2.0)),
_fillPatchSegments, 2);
_horizontalFixupPatch = context.CreateVertexArray(ringFixupHorizontalMesh, _shaderProgram.VertexAttributes, BufferHint.StaticDraw);
// Create the 3xM block used to fill the space between the MxM blocks in the ring
Mesh ringFixupVerticalMesh = RectangleTessellator.Compute(
new RectangleD(new Vector2D(0.0, 0.0), new Vector2D(2.0, _fillPatchSegments)),
2, _fillPatchSegments);
_verticalFixupPatch = context.CreateVertexArray(ringFixupVerticalMesh, _shaderProgram.VertexAttributes, BufferHint.StaticDraw);
Mesh offsetStripHorizontalMesh = RectangleTessellator.Compute(
new RectangleD(new Vector2D(0.0, 0.0), new Vector2D(2 * _fillPatchPosts, 1.0)),
2 * _fillPatchPosts, 1);
_horizontalOffsetPatch = context.CreateVertexArray(offsetStripHorizontalMesh, _shaderProgram.VertexAttributes, BufferHint.StaticDraw);
Mesh offsetStripVerticalMesh = RectangleTessellator.Compute(
new RectangleD(new Vector2D(0.0, 0.0), new Vector2D(1.0, 2 * _fillPatchPosts - 1)),
1, 2 * _fillPatchPosts - 1);
_verticalOffsetPatch = context.CreateVertexArray(offsetStripVerticalMesh, _shaderProgram.VertexAttributes, BufferHint.StaticDraw);
Mesh centerMesh = RectangleTessellator.Compute(new RectangleD(new Vector2D(0.0, 0.0), new Vector2D(2.0, 2.0)), 2, 2);
_centerPatch = context.CreateVertexArray(centerMesh, _shaderProgram.VertexAttributes, BufferHint.StaticDraw);
Mesh degenerateTriangleMesh = CreateDegenerateTriangleMesh();
_degenerateTrianglePatch = context.CreateVertexArray(degenerateTriangleMesh, _shaderProgram.VertexAttributes, BufferHint.StaticDraw);
_patchOriginInClippedLevel = (Uniform<Vector2F>)_shaderProgram.Uniforms["u_patchOriginInClippedLevel"];
_levelScaleFactor = (Uniform<Vector2F>)_shaderProgram.Uniforms["u_levelScaleFactor"];
_levelZeroWorldScaleFactor = (Uniform<Vector2F>)_shaderProgram.Uniforms["u_levelZeroWorldScaleFactor"];
_levelOffsetFromWorldOrigin = (Uniform<Vector2F>)_shaderProgram.Uniforms["u_levelOffsetFromWorldOrigin"];
_heightExaggeration = (Uniform<float>)_shaderProgram.Uniforms["u_heightExaggeration"];
_viewPosInClippedLevel = (Uniform<Vector2F>)_shaderProgram.Uniforms["u_viewPosInClippedLevel"];
_fineLevelOriginInCoarse = (Uniform<Vector2F>)_shaderProgram.Uniforms["u_fineLevelOriginInCoarse"];
_unblendedRegionSize = (Uniform<Vector2F>)_shaderProgram.Uniforms["u_unblendedRegionSize"];
_oneOverBlendedRegionSize = (Uniform<Vector2F>)_shaderProgram.Uniforms["u_oneOverBlendedRegionSize"];
_fineTextureOrigin = (Uniform<Vector2F>)_shaderProgram.Uniforms["u_fineTextureOrigin"];
_showBlendRegions = (Uniform<bool>)_shaderProgram.Uniforms["u_showBlendRegions"];
_useBlendRegions = (Uniform<bool>)_shaderProgram.Uniforms["u_useBlendRegions"];
_oneOverClipmapSize = (Uniform<float>)_shaderProgram.Uniforms["u_oneOverClipmapSize"];
_color = (Uniform<Vector3F>)_shaderProgram.Uniforms["u_color"];
_blendRegionColor = (Uniform<Vector3F>)_shaderProgram.Uniforms["u_blendRegionColor"];
_terrainToImageryResolutionRatio = (Uniform<Vector2F>)_shaderProgram.Uniforms["u_terrainToImageryResolutionRatio"];
_terrainOffsetInImagery = (Uniform<Vector2F>)_shaderProgram.Uniforms["u_terrainOffsetInImagery"];
_oneOverImagerySize = (Uniform<Vector2F>)_shaderProgram.Uniforms["u_oneOverImagerySize"];
_showImagery = (Uniform<bool>)_shaderProgram.Uniforms["u_showImagery"];
_lighting = (Uniform<bool>)_shaderProgram.Uniforms["u_shade"];
((Uniform<Vector3F>)_shaderProgram.Uniforms["u_globeRadiiSquared"]).Value =
ellipsoid.RadiiSquared.ToVector3F();
_renderState = new RenderState();
_renderState.FacetCulling.FrontFaceWindingOrder = fieldBlockMesh.FrontFaceWindingOrder;
_primitiveType = fieldBlockMesh.PrimitiveType;
float oneOverBlendedRegionSize = (float)(10.0 / _clipmapPosts);
_oneOverBlendedRegionSize.Value = new Vector2F(oneOverBlendedRegionSize, oneOverBlendedRegionSize);
float unblendedRegionSize = (float)(_clipmapSegments / 2 - _clipmapPosts / 10.0 - 1);
_unblendedRegionSize.Value = new Vector2F(unblendedRegionSize, unblendedRegionSize);
_useBlendRegions.Value = true;
_showImagery.Value = true;
_oneOverClipmapSize.Value = 1.0f / clipmapPosts;
_updater = new ClipmapUpdater(context, _clipmapLevels);
HeightExaggeration = 0.00001f;
}
private void UpsampleTileData(Context context, ClipmapLevel level, RasterDataDetails details, RasterTileRegion region)
{
ClipmapLevel coarserLevel = level.CoarserLevel;
if (coarserLevel == null)
{
return;
}
Texture2D levelTexture;
Texture2D coarserLevelTexture;
Vector2I originInTextures;
Vector2I coarserOriginInTextures;
ClipmapLevel.Extent nextExtent;
ClipmapLevel.Extent coarserNextExtent;
if (details.Type == RasterType.Terrain)
{
levelTexture = level.HeightTexture;
coarserLevelTexture = coarserLevel.HeightTexture;
originInTextures = level.OriginInTextures;
coarserOriginInTextures = coarserLevel.OriginInTextures;
nextExtent = level.NextExtent;
coarserNextExtent = coarserLevel.NextExtent;
}
else
{
levelTexture = level.ImageryTexture;
coarserLevelTexture = coarserLevel.ImageryTexture;
originInTextures = level.OriginInImagery;
coarserOriginInTextures = coarserLevel.OriginInImagery;
nextExtent = level.NextImageryExtent;
coarserNextExtent = coarserLevel.NextImageryExtent;
}
context.TextureUnits[0].Texture = coarserLevelTexture;
context.TextureUnits[0].TextureSampler = Device.TextureSamplers.LinearRepeat;
_framebuffer.ColorAttachments[_upsampleTexelOutput] = levelTexture;
int fineClipmapSize = nextExtent.East - nextExtent.West + 1;
int destWest = (originInTextures.X + (region.Tile.West + region.West - nextExtent.West)) % fineClipmapSize;
int destSouth = (originInTextures.Y + (region.Tile.South + region.South - nextExtent.South)) % fineClipmapSize;
int coarseClipmapSize = coarserNextExtent.East - coarserNextExtent.West + 1;
double sourceWest = (coarserOriginInTextures.X + ((region.Tile.West + region.West) / 2.0 - coarserNextExtent.West)) % coarseClipmapSize;
double sourceSouth = (coarserOriginInTextures.Y + ((region.Tile.South + region.South) / 2.0 - coarserNextExtent.South)) % coarseClipmapSize;
int width = region.East - region.West + 1;
int height = region.North - region.South + 1;
_upsampleSourceOrigin.Value = new Vector2F((float)sourceWest, (float)sourceSouth);
_upsampleUpdateSize.Value = new Vector2F(width, height);
_upsampleDestinationOffset.Value = new Vector2F(destWest, destSouth);
_upsampleOneOverTextureSize.Value = new Vector2F(1.0f / coarserLevelTexture.Description.Width, 1.0f / coarserLevelTexture.Description.Height);
// Save the current state of the context
Rectangle oldViewport = context.Viewport;
Framebuffer oldFramebuffer = context.Framebuffer;
// Update the context and draw
context.Viewport = new Rectangle(0, 0, levelTexture.Description.Width, levelTexture.Description.Height);
context.Framebuffer = _framebuffer;
context.Draw(_unitQuadPrimitiveType, _upsampleDrawState, _sceneState);
// Restore the context to its original state
context.Framebuffer = oldFramebuffer;
context.Viewport = oldViewport;
}
public GlobeClipmapTerrain(Context context, RasterSource terrainSource, EsriRestImagery imagery, Ellipsoid ellipsoid, int clipmapPosts)
{
_terrainSource = terrainSource;
_ellipsoid = ellipsoid;
_clipmapPosts = clipmapPosts;
_clipmapSegments = _clipmapPosts - 1;
int clipmapLevels = _terrainSource.Levels.Count;
_clipmapLevels = new ClipmapLevel[clipmapLevels];
for (int i = 0; i < _clipmapLevels.Length; ++i)
{
_clipmapLevels[i] = new ClipmapLevel();
}
for (int i = 0; i < _clipmapLevels.Length; ++i)
{
RasterLevel terrainLevel = _terrainSource.Levels[i];
_clipmapLevels[i].Terrain = terrainLevel;
_clipmapLevels[i].HeightTexture = Device.CreateTexture2D(new Texture2DDescription(_clipmapPosts, _clipmapPosts, TextureFormat.Red32f));
_clipmapLevels[i].NormalTexture = Device.CreateTexture2D(new Texture2DDescription(_clipmapPosts, _clipmapPosts, TextureFormat.RedGreenBlue32f));
_clipmapLevels[i].CoarserLevel = i == 0 ? null : _clipmapLevels[i - 1];
_clipmapLevels[i].FinerLevel = i == _clipmapLevels.Length - 1 ? null : _clipmapLevels[i + 1];
// Aim for roughly one imagery texel per geometry texel.
// Find the first imagery level that meets our resolution needs.
double longitudeResRequired = terrainLevel.PostDeltaLongitude;
double latitudeResRequired = terrainLevel.PostDeltaLatitude;
RasterLevel imageryLevel = null;
for (int j = 0; j < imagery.Levels.Count; ++j)
{
imageryLevel = imagery.Levels[j];
if (imageryLevel.PostDeltaLongitude <= longitudeResRequired &&
imageryLevel.PostDeltaLatitude <= latitudeResRequired)
{
break;
}
}
_clipmapLevels[i].Imagery = imageryLevel;
_clipmapLevels[i].ImageryWidth = (int)Math.Ceiling(_clipmapPosts * terrainLevel.PostDeltaLongitude / imageryLevel.PostDeltaLongitude);
_clipmapLevels[i].ImageryHeight = (int)Math.Ceiling(_clipmapPosts * terrainLevel.PostDeltaLatitude / imageryLevel.PostDeltaLatitude);
_clipmapLevels[i].ImageryTexture = Device.CreateTexture2D(new Texture2DDescription(_clipmapLevels[i].ImageryWidth, _clipmapLevels[i].ImageryHeight, TextureFormat.RedGreenBlue8, false));
}
_shaderProgram = Device.CreateShaderProgram(
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.ClipmapTerrain.GlobeClipmapVS.glsl"),
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.ClipmapTerrain.GlobeClipmapFS.glsl"));
_fillPatchPosts = (clipmapPosts + 1) / 4; // M
_fillPatchSegments = _fillPatchPosts - 1;
// Create the MxM block used to fill the ring and the field.
Mesh fieldBlockMesh = RectangleTessellator.Compute(
new RectangleD(new Vector2D(0.0, 0.0), new Vector2D(_fillPatchSegments, _fillPatchSegments)),
_fillPatchSegments, _fillPatchSegments);
_fillPatch = context.CreateVertexArray(fieldBlockMesh, _shaderProgram.VertexAttributes, BufferHint.StaticDraw);
// Create the Mx3 block used to fill the space between the MxM blocks in the ring
Mesh ringFixupHorizontalMesh = RectangleTessellator.Compute(
new RectangleD(new Vector2D(0.0, 0.0), new Vector2D(_fillPatchSegments, 2.0)),
_fillPatchSegments, 2);
_horizontalFixupPatch = context.CreateVertexArray(ringFixupHorizontalMesh, _shaderProgram.VertexAttributes, BufferHint.StaticDraw);
// Create the 3xM block used to fill the space between the MxM blocks in the ring
Mesh ringFixupVerticalMesh = RectangleTessellator.Compute(
new RectangleD(new Vector2D(0.0, 0.0), new Vector2D(2.0, _fillPatchSegments)),
2, _fillPatchSegments);
_verticalFixupPatch = context.CreateVertexArray(ringFixupVerticalMesh, _shaderProgram.VertexAttributes, BufferHint.StaticDraw);
Mesh offsetStripHorizontalMesh = RectangleTessellator.Compute(
new RectangleD(new Vector2D(0.0, 0.0), new Vector2D(2 * _fillPatchPosts, 1.0)),
2 * _fillPatchPosts, 1);
_horizontalOffsetPatch = context.CreateVertexArray(offsetStripHorizontalMesh, _shaderProgram.VertexAttributes, BufferHint.StaticDraw);
Mesh offsetStripVerticalMesh = RectangleTessellator.Compute(
new RectangleD(new Vector2D(0.0, 0.0), new Vector2D(1.0, 2 * _fillPatchPosts - 1)),
1, 2 * _fillPatchPosts - 1);
_verticalOffsetPatch = context.CreateVertexArray(offsetStripVerticalMesh, _shaderProgram.VertexAttributes, BufferHint.StaticDraw);
Mesh centerMesh = RectangleTessellator.Compute(new RectangleD(new Vector2D(0.0, 0.0), new Vector2D(2.0, 2.0)), 2, 2);
_centerPatch = context.CreateVertexArray(centerMesh, _shaderProgram.VertexAttributes, BufferHint.StaticDraw);
Mesh degenerateTriangleMesh = CreateDegenerateTriangleMesh();
_degenerateTrianglePatch = context.CreateVertexArray(degenerateTriangleMesh, _shaderProgram.VertexAttributes, BufferHint.StaticDraw);
_patchOriginInClippedLevel = (Uniform <Vector2F>)_shaderProgram.Uniforms["u_patchOriginInClippedLevel"];
_levelScaleFactor = (Uniform <Vector2F>)_shaderProgram.Uniforms["u_levelScaleFactor"];
_levelZeroWorldScaleFactor = (Uniform <Vector2F>)_shaderProgram.Uniforms["u_levelZeroWorldScaleFactor"];
_levelOffsetFromWorldOrigin = (Uniform <Vector2F>)_shaderProgram.Uniforms["u_levelOffsetFromWorldOrigin"];
_heightExaggeration = (Uniform <float>)_shaderProgram.Uniforms["u_heightExaggeration"];
_viewPosInClippedLevel = (Uniform <Vector2F>)_shaderProgram.Uniforms["u_viewPosInClippedLevel"];
_fineLevelOriginInCoarse = (Uniform <Vector2F>)_shaderProgram.Uniforms["u_fineLevelOriginInCoarse"];
_unblendedRegionSize = (Uniform <Vector2F>)_shaderProgram.Uniforms["u_unblendedRegionSize"];
_oneOverBlendedRegionSize = (Uniform <Vector2F>)_shaderProgram.Uniforms["u_oneOverBlendedRegionSize"];
_fineTextureOrigin = (Uniform <Vector2F>)_shaderProgram.Uniforms["u_fineTextureOrigin"];
_showBlendRegions = (Uniform <bool>)_shaderProgram.Uniforms["u_showBlendRegions"];
_useBlendRegions = (Uniform <bool>)_shaderProgram.Uniforms["u_useBlendRegions"];
_oneOverClipmapSize = (Uniform <float>)_shaderProgram.Uniforms["u_oneOverClipmapSize"];
_color = (Uniform <Vector3F>)_shaderProgram.Uniforms["u_color"];
_blendRegionColor = (Uniform <Vector3F>)_shaderProgram.Uniforms["u_blendRegionColor"];
_terrainToImageryResolutionRatio = (Uniform <Vector2F>)_shaderProgram.Uniforms["u_terrainToImageryResolutionRatio"];
_terrainOffsetInImagery = (Uniform <Vector2F>)_shaderProgram.Uniforms["u_terrainOffsetInImagery"];
_oneOverImagerySize = (Uniform <Vector2F>)_shaderProgram.Uniforms["u_oneOverImagerySize"];
_showImagery = (Uniform <bool>)_shaderProgram.Uniforms["u_showImagery"];
_lighting = (Uniform <bool>)_shaderProgram.Uniforms["u_shade"];
((Uniform <Vector3F>)_shaderProgram.Uniforms["u_globeRadiiSquared"]).Value =
ellipsoid.RadiiSquared.ToVector3F();
_renderState = new RenderState();
_renderState.FacetCulling.FrontFaceWindingOrder = fieldBlockMesh.FrontFaceWindingOrder;
_primitiveType = fieldBlockMesh.PrimitiveType;
float oneOverBlendedRegionSize = (float)(10.0 / _clipmapPosts);
_oneOverBlendedRegionSize.Value = new Vector2F(oneOverBlendedRegionSize, oneOverBlendedRegionSize);
float unblendedRegionSize = (float)(_clipmapSegments / 2 - _clipmapPosts / 10.0 - 1);
_unblendedRegionSize.Value = new Vector2F(unblendedRegionSize, unblendedRegionSize);
_useBlendRegions.Value = true;
_showImagery.Value = true;
_oneOverClipmapSize.Value = 1.0f / clipmapPosts;
_updater = new ClipmapUpdater(context, _clipmapLevels);
HeightExaggeration = 0.00001f;
}
private void ApplyNewTile(Context context, RasterDataDetails details, ClipmapLevel level, RasterTile tile)
{
ClipmapLevel.Extent nextExtent = details.Type == RasterType.Terrain ? level.NextExtent : level.NextImageryExtent;
RasterLevel rasterLevel = details.Type == RasterType.Terrain ? level.Terrain : level.Imagery;
ClipmapUpdate entireLevel = new ClipmapUpdate(
level,
nextExtent.West,
nextExtent.South,
nextExtent.East,
nextExtent.North);
ClipmapUpdate thisTile = new ClipmapUpdate(
level,
tile.West - 1,
tile.South - 1,
tile.East + 1,
tile.North + 1);
ClipmapUpdate intersection = IntersectUpdates(entireLevel, thisTile);
if (intersection.Width > 0 && intersection.Height > 0)
{
Update(context, intersection, level, details, rasterLevel);
// Recurse on child tiles if they're NOT loaded. Unloaded children will use data from this tile.
ClipmapLevel finer = level.FinerLevel;
if (finer != null)
{
ApplyIfNotLoaded(context, details, finer, tile.SouthwestChild);
ApplyIfNotLoaded(context, details, finer, tile.SoutheastChild);
ApplyIfNotLoaded(context, details, finer, tile.NorthwestChild);
ApplyIfNotLoaded(context, details, finer, tile.NortheastChild);
}
}
}
private void UpsampleTileData(Context context, ClipmapLevel level, RasterDataDetails details, RasterTileRegion region)
{
ClipmapLevel coarserLevel = level.CoarserLevel;
if (coarserLevel == null)
return;
Texture2D levelTexture;
Texture2D coarserLevelTexture;
Vector2I originInTextures;
Vector2I coarserOriginInTextures;
ClipmapLevel.Extent nextExtent;
ClipmapLevel.Extent coarserNextExtent;
if (details.Type == RasterType.Terrain)
{
levelTexture = level.HeightTexture;
coarserLevelTexture = coarserLevel.HeightTexture;
originInTextures = level.OriginInTextures;
coarserOriginInTextures = coarserLevel.OriginInTextures;
nextExtent = level.NextExtent;
coarserNextExtent = coarserLevel.NextExtent;
}
else
{
levelTexture = level.ImageryTexture;
coarserLevelTexture = coarserLevel.ImageryTexture;
originInTextures = level.OriginInImagery;
coarserOriginInTextures = coarserLevel.OriginInImagery;
nextExtent = level.NextImageryExtent;
coarserNextExtent = coarserLevel.NextImageryExtent;
}
context.TextureUnits[0].Texture = coarserLevelTexture;
context.TextureUnits[0].TextureSampler = Device.TextureSamplers.LinearRepeat;
_framebuffer.ColorAttachments[_upsampleTexelOutput] = levelTexture;
int fineClipmapSize = nextExtent.East - nextExtent.West + 1;
int destWest = (originInTextures.X + (region.Tile.West + region.West - nextExtent.West)) % fineClipmapSize;
int destSouth = (originInTextures.Y + (region.Tile.South + region.South - nextExtent.South)) % fineClipmapSize;
int coarseClipmapSize = coarserNextExtent.East - coarserNextExtent.West + 1;
double sourceWest = (coarserOriginInTextures.X + ((region.Tile.West + region.West) / 2.0 - coarserNextExtent.West)) % coarseClipmapSize;
double sourceSouth = (coarserOriginInTextures.Y + ((region.Tile.South + region.South) / 2.0 - coarserNextExtent.South)) % coarseClipmapSize;
int width = region.East - region.West + 1;
int height = region.North - region.South + 1;
_upsampleSourceOrigin.Value = new Vector2F((float)sourceWest, (float)sourceSouth);
_upsampleUpdateSize.Value = new Vector2F(width, height);
_upsampleDestinationOffset.Value = new Vector2F(destWest, destSouth);
_upsampleOneOverTextureSize.Value = new Vector2F(1.0f / coarserLevelTexture.Description.Width, 1.0f / coarserLevelTexture.Description.Height);
// Save the current state of the context
Rectangle oldViewport = context.Viewport;
Framebuffer oldFramebuffer = context.Framebuffer;
// Update the context and draw
context.Viewport = new Rectangle(0, 0, levelTexture.Description.Width, levelTexture.Description.Height);
context.Framebuffer = _framebuffer;
context.Draw(_unitQuadPrimitiveType, _upsampleDrawState, _sceneState);
// Restore the context to its original state
context.Framebuffer = oldFramebuffer;
context.Viewport = oldViewport;
}
private void RequestTileLoad(RasterDataDetails details, ClipmapLevel level, RasterTile tile)
{
LinkedListNode<TileLoadRequest> requestNode;
bool exists = details.LoadingTiles.TryGetValue(tile.Identifier, out requestNode);
if (!exists)
{
// Create a new request.
TileLoadRequest request = new TileLoadRequest();
request.Level = level;
request.Tile = tile;
requestNode = new LinkedListNode<TileLoadRequest>(request);
}
lock (details.RequestList)
{
if (exists)
{
// Remove the existing request from the queue so we can re-insert it
// in its new location.
if (requestNode.List == null)
{
// Request was in the queue at one point, but it's not anymore.
// That means it's been loaded, so we don't need to do anything.
return;
}
details.RequestList.Remove(requestNode);
}
if (details.RequestInsertionPoint == null || details.RequestInsertionPoint.List == null)
{
details.RequestList.AddLast(requestNode);
}
else
{
details.RequestList.AddBefore(details.RequestInsertionPoint, requestNode);
}
details.RequestInsertionPoint = requestNode;
// If the request list has too many entries, delete from the beginning
const int MaxRequests = 500;
while (details.RequestList.Count > MaxRequests)
{
LinkedListNode<TileLoadRequest> nodeToRemove = details.RequestList.First;
details.RequestList.RemoveFirst();
details.LoadingTiles.Remove(nodeToRemove.Value.Tile.Identifier);
}
Monitor.Pulse(details.RequestList);
}
details.LoadingTiles[tile.Identifier] = requestNode;
}
public void PreRender(Context context, SceneState sceneState)
{
if (!_lodUpdateEnabled)
{
return;
}
_clipmapCenter = _ellipsoid.ToGeodetic3D(sceneState.Camera.Eye);
//Geodetic2D center = Ellipsoid.ScaledWgs84.ToGeodetic2D(sceneState.Camera.Target / Ellipsoid.Wgs84.MaximumRadius);
Geodetic2D center = new Geodetic2D(_clipmapCenter.Longitude, _clipmapCenter.Latitude);
double centerLongitude = Trig.ToDegrees(center.Longitude);
double centerLatitude = Trig.ToDegrees(center.Latitude);
ClipmapLevel level = _clipmapLevels[_clipmapLevels.Length - 1];
double longitudeIndex = level.Terrain.LongitudeToIndex(centerLongitude);
double latitudeIndex = level.Terrain.LatitudeToIndex(centerLatitude);
double imageryLongitudeIndex = level.Imagery.LongitudeToIndex(centerLongitude);
double imageryLatitudeIndex = level.Imagery.LatitudeToIndex(centerLatitude);
int west = (int)(longitudeIndex - _clipmapPosts / 2);
if ((west % 2) != 0)
{
++west;
}
int south = (int)(latitudeIndex - _clipmapPosts / 2);
if ((south % 2) != 0)
{
++south;
}
int imageryWest = (int)(imageryLongitudeIndex - level.ImageryWidth / 2);
int imagerySouth = (int)(imageryLatitudeIndex - level.ImageryHeight / 2);
level.NextExtent.West = west;
level.NextExtent.East = west + _clipmapSegments;
level.NextExtent.South = south;
level.NextExtent.North = south + _clipmapSegments;
level.NextImageryExtent.West = imageryWest;
level.NextImageryExtent.East = imageryWest + level.ImageryWidth;
level.NextImageryExtent.South = imagerySouth;
level.NextImageryExtent.North = imagerySouth + level.ImageryHeight;
UpdateOriginInTextures(level);
UpdateImageryOriginInTextures(level);
for (int i = _clipmapLevels.Length - 2; i >= 0; --i)
{
level = _clipmapLevels[i];
ClipmapLevel finerLevel = _clipmapLevels[i + 1];
// Terrain
level.NextExtent.West = finerLevel.NextExtent.West / 2 - _fillPatchSegments;
level.OffsetStripOnEast = (level.NextExtent.West % 2) == 0;
if (!level.OffsetStripOnEast)
{
--level.NextExtent.West;
}
level.NextExtent.East = level.NextExtent.West + _clipmapSegments;
level.NextExtent.South = finerLevel.NextExtent.South / 2 - _fillPatchSegments;
level.OffsetStripOnNorth = (level.NextExtent.South % 2) == 0;
if (!level.OffsetStripOnNorth)
{
--level.NextExtent.South;
}
level.NextExtent.North = level.NextExtent.South + _clipmapSegments;
// Imagery
imageryWest = (int)level.Imagery.LongitudeToIndex(level.Terrain.IndexToLongitude(level.NextExtent.West));
imagerySouth = (int)level.Imagery.LatitudeToIndex(level.Terrain.IndexToLatitude(level.NextExtent.South));
level.NextImageryExtent.West = imageryWest;
level.NextImageryExtent.East = imageryWest + level.ImageryWidth - 1;
level.NextImageryExtent.South = imagerySouth;
level.NextImageryExtent.North = imagerySouth + level.ImageryHeight - 1;
UpdateOriginInTextures(level);
UpdateImageryOriginInTextures(level);
}
_updater.ApplyNewData(context);
for (int i = 0; i < _clipmapLevels.Length; ++i)
{
ClipmapLevel thisLevel = _clipmapLevels[i];
ClipmapLevel coarserLevel = _clipmapLevels[i > 0 ? i - 1 : 0];
_updater.RequestTileResidency(context, thisLevel);
UpdateTerrain(thisLevel, coarserLevel, context, sceneState);
UpdateImagery(thisLevel, coarserLevel, context, sceneState);
}
}
public void RequestTileResidency(Context context, ClipmapLevel level)
{
RequestTileResidency(context, level, _terrain, level.Terrain, level.NextExtent);
RequestTileResidency(context, level, _imagery, level.Imagery, level.NextImageryExtent);
}
private void InitializeRequestThreads(Context context, RasterDataDetails details, ClipmapLevel clipmapLevelZero, RasterLevel rasterLevelZero)
{
details.WorkerWindow = Device.CreateWindow(1, 1);
context.MakeCurrent();
#if !SingleThreaded
Thread requestThread = new Thread(RequestThreadEntryPoint);
requestThread.IsBackground = true;
requestThread.Start(details);
#endif
// Preload the entire world at level 0
RasterTileRegion[] regions = rasterLevelZero.GetTilesInExtent(0, 0, rasterLevelZero.LongitudePosts - 1, rasterLevelZero.LatitudePosts - 1);
foreach (RasterTileRegion region in regions)
{
RequestTileLoad(details, clipmapLevelZero, region.Tile);
}
}
private bool RenderLevel(int levelIndex, ClipmapLevel level, ClipmapLevel coarserLevel, bool fillRing, Vector2D center, Context context, SceneState sceneState)
{
context.TextureUnits[0].Texture = level.HeightTexture;
context.TextureUnits[0].TextureSampler = Device.TextureSamplers.NearestRepeat;
context.TextureUnits[1].Texture = coarserLevel.HeightTexture;
context.TextureUnits[1].TextureSampler = Device.TextureSamplers.LinearRepeat;
context.TextureUnits[2].Texture = level.NormalTexture;
context.TextureUnits[2].TextureSampler = Device.TextureSamplers.LinearRepeat;
context.TextureUnits[3].Texture = coarserLevel.NormalTexture;
context.TextureUnits[3].TextureSampler = Device.TextureSamplers.LinearRepeat;
context.TextureUnits[4].Texture = level.ImageryTexture;
context.TextureUnits[4].TextureSampler = Device.TextureSamplers.LinearRepeat;
if (_colorClipmapLevels)
{
_color.Value = _colors[levelIndex];
_blendRegionColor.Value = levelIndex == 0 ? _colors[levelIndex] : _colors[levelIndex - 1];
}
else
{
_color.Value = new Vector3F(0.0f, 1.0f, 0.0f);
_blendRegionColor.Value = new Vector3F(0.0f, 0.0f, 1.0f);
}
int west = level.CurrentExtent.West;
int south = level.CurrentExtent.South;
int east = level.CurrentExtent.East;
int north = level.CurrentExtent.North;
float levelScaleFactor = (float)Math.Pow(2.0, -levelIndex);
_levelScaleFactor.Value = new Vector2F(levelScaleFactor, levelScaleFactor);
_levelOffsetFromWorldOrigin.Value = new Vector2F((float)((double)level.CurrentExtent.West - level.Terrain.LongitudeToIndex(0.0)),
(float)((double)level.CurrentExtent.South - level.Terrain.LatitudeToIndex(0.0)));
int coarserWest = coarserLevel.CurrentExtent.West;
int coarserSouth = coarserLevel.CurrentExtent.South;
_fineLevelOriginInCoarse.Value = coarserLevel.OriginInTextures.ToVector2F() +
new Vector2F(west / 2 - coarserWest + 0.5f,
south / 2 - coarserSouth + 0.5f);
_viewPosInClippedLevel.Value = new Vector2F((float)(level.Terrain.LongitudeToIndex(Trig.ToDegrees(_clipmapCenter.Longitude)) - level.CurrentExtent.West),
(float)(level.Terrain.LatitudeToIndex(Trig.ToDegrees(_clipmapCenter.Latitude)) - level.CurrentExtent.South));
_fineTextureOrigin.Value = level.OriginInTextures.ToVector2F() + new Vector2F(0.5f, 0.5f);
_useBlendRegions.Value = _blendRegionsEnabled && level != coarserLevel;
_terrainToImageryResolutionRatio.Value = new Vector2F((float)(level.Terrain.PostDeltaLongitude / level.Imagery.PostDeltaLongitude),
(float)(level.Terrain.PostDeltaLatitude / level.Imagery.PostDeltaLatitude));
double terrainWest = level.Terrain.IndexToLongitude(level.CurrentExtent.West);
double terrainSouth = level.Terrain.IndexToLatitude(level.CurrentExtent.South);
double imageryWestIndex = level.Imagery.LongitudeToIndex(terrainWest);
double imagerySouthIndex = level.Imagery.LatitudeToIndex(terrainSouth);
Vector2D terrainOffsetInImagery = level.OriginInImagery.ToVector2D() +
new Vector2D(imageryWestIndex - level.CurrentImageryExtent.West,
imagerySouthIndex - level.CurrentImageryExtent.South);
_terrainOffsetInImagery.Value = terrainOffsetInImagery.ToVector2F();
_oneOverImagerySize.Value = new Vector2F((float)(1.0 / level.ImageryWidth), (float)(1.0 / level.ImageryHeight));
DrawBlock(_fillPatch, level, coarserLevel, west, south, west, south, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, west + _fillPatchSegments, south, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, east - 2 * _fillPatchSegments, south, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, east - _fillPatchSegments, south, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, west, south + _fillPatchSegments, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, east - _fillPatchSegments, south + _fillPatchSegments, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, west, north - 2 * _fillPatchSegments, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, east - _fillPatchSegments, north - 2 * _fillPatchSegments, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, west, north - _fillPatchSegments, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, west + _fillPatchSegments, north - _fillPatchSegments, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, east - 2 * _fillPatchSegments, north - _fillPatchSegments, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, east - _fillPatchSegments, north - _fillPatchSegments, context, sceneState);
DrawBlock(_horizontalFixupPatch, level, coarserLevel, west, south, west, south + 2 * _fillPatchSegments, context, sceneState);
DrawBlock(_horizontalFixupPatch, level, coarserLevel, west, south, east - _fillPatchSegments, south + 2 * _fillPatchSegments, context, sceneState);
DrawBlock(_verticalFixupPatch, level, coarserLevel, west, south, west + 2 * _fillPatchSegments, south, context, sceneState);
DrawBlock(_verticalFixupPatch, level, coarserLevel, west, south, west + 2 * _fillPatchSegments, north - _fillPatchSegments, context, sceneState);
DrawBlock(_degenerateTrianglePatch, level, coarserLevel, west, south, west, south, context, sceneState);
// Fill the center of the highest-detail ring
if (fillRing)
{
DrawBlock(_fillPatch, level, coarserLevel, west, south, west + _fillPatchSegments, south + _fillPatchSegments, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, west + 2 * _fillPatchPosts, south + _fillPatchSegments, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, west + _fillPatchSegments, south + 2 * _fillPatchPosts, context, sceneState);
DrawBlock(_fillPatch, level, coarserLevel, west, south, west + 2 * _fillPatchPosts, south + 2 * _fillPatchPosts, context, sceneState);
DrawBlock(_horizontalFixupPatch, level, coarserLevel, west, south, west + _fillPatchSegments, south + 2 * _fillPatchSegments, context, sceneState);
DrawBlock(_horizontalFixupPatch, level, coarserLevel, west, south, west + 2 * _fillPatchPosts, south + 2 * _fillPatchSegments, context, sceneState);
DrawBlock(_verticalFixupPatch, level, coarserLevel, west, south, west + 2 * _fillPatchSegments, south + _fillPatchSegments, context, sceneState);
DrawBlock(_verticalFixupPatch, level, coarserLevel, west, south, west + 2 * _fillPatchSegments, south + 2 * _fillPatchPosts, context, sceneState);
DrawBlock(_centerPatch, level, coarserLevel, west, south, west + 2 * _fillPatchSegments, south + 2 * _fillPatchSegments, context, sceneState);
}
else
{
int offset = level.OffsetStripOnNorth
? north - _fillPatchPosts
: south + _fillPatchSegments;
DrawBlock(_horizontalOffsetPatch, level, coarserLevel, west, south, west + _fillPatchSegments, offset, context, sceneState);
int southOffset = level.OffsetStripOnNorth ? 0 : 1;
offset = level.OffsetStripOnEast
? east - _fillPatchPosts
: west + _fillPatchSegments;
DrawBlock(_verticalOffsetPatch, level, coarserLevel, west, south, offset, south + _fillPatchSegments + southOffset, context, sceneState);
}
return true;
}
private void UpdateOriginInTextures(ClipmapLevel level)
{
int deltaX = level.NextExtent.West - level.CurrentExtent.West;
int deltaY = level.NextExtent.South - level.CurrentExtent.South;
if (deltaX == 0 && deltaY == 0)
return;
if (level.CurrentExtent.West > level.CurrentExtent.East || // initial update
Math.Abs(deltaX) >= _clipmapPosts || Math.Abs(deltaY) >= _clipmapPosts) // complete update
{
level.OriginInTextures = new Vector2I(0, 0);
}
else
{
int newOriginX = (level.OriginInTextures.X + deltaX) % _clipmapPosts;
if (newOriginX < 0)
newOriginX += _clipmapPosts;
int newOriginY = (level.OriginInTextures.Y + deltaY) % _clipmapPosts;
if (newOriginY < 0)
newOriginY += _clipmapPosts;
level.OriginInTextures = new Vector2I(newOriginX, newOriginY);
}
}
private void ApplyIfNotLoaded(Context context, RasterDataDetails details, ClipmapLevel level, RasterTile tile)
{
Texture2D texture;
if (!details.LoadedTiles.TryGetValue(tile.Identifier, out texture) || texture == null)
{
ApplyNewTile(context, details, level, tile);
}
}
private void UpdateImagery(ClipmapLevel level, ClipmapLevel coarserLevel, Context context, SceneState sceneState)
{
int deltaX = level.NextImageryExtent.West - level.CurrentImageryExtent.West;
int deltaY = level.NextImageryExtent.South - level.CurrentImageryExtent.South;
if (deltaX == 0 && deltaY == 0)
return;
int minLongitude = deltaX > 0 ? level.CurrentImageryExtent.East + 1 : level.NextImageryExtent.West;
int maxLongitude = deltaX > 0 ? level.NextImageryExtent.East : level.CurrentImageryExtent.West - 1;
int minLatitude = deltaY > 0 ? level.CurrentImageryExtent.North + 1 : level.NextImageryExtent.South;
int maxLatitude = deltaY > 0 ? level.NextImageryExtent.North : level.CurrentImageryExtent.South - 1;
int width = maxLongitude - minLongitude + 1;
int height = maxLatitude - minLatitude + 1;
if (level.CurrentImageryExtent.West > level.CurrentImageryExtent.East || // initial update
width >= level.ImageryWidth || height >= level.ImageryHeight) // complete update
{
// Initial or complete update.
width = level.ImageryWidth;
height = level.ImageryHeight;
deltaX = level.ImageryWidth;
deltaY = level.ImageryHeight;
minLongitude = level.NextImageryExtent.West;
maxLongitude = level.NextImageryExtent.East;
minLatitude = level.NextImageryExtent.South;
maxLatitude = level.NextImageryExtent.North;
}
if (height > 0)
{
ClipmapUpdate horizontalUpdate = new ClipmapUpdate(
level,
level.NextImageryExtent.West,
minLatitude,
level.NextImageryExtent.East,
maxLatitude);
_updater.UpdateImagery(context, horizontalUpdate);
}
if (width > 0)
{
ClipmapUpdate verticalUpdate = new ClipmapUpdate(
level,
minLongitude,
level.NextImageryExtent.South,
maxLongitude,
level.NextImageryExtent.North);
_updater.UpdateImagery(context, verticalUpdate);
}
level.CurrentImageryExtent.West = level.NextImageryExtent.West;
level.CurrentImageryExtent.South = level.NextImageryExtent.South;
level.CurrentImageryExtent.East = level.NextImageryExtent.East;
level.CurrentImageryExtent.North = level.NextImageryExtent.North;
}
private void RequestTileResidency(Context context, ClipmapLevel level, RasterDataDetails details, RasterLevel rasterLevel, ClipmapLevel.Extent nextExtent)
{
RasterTileRegion[] tileRegions = rasterLevel.GetTilesInExtent(nextExtent.West, nextExtent.South, nextExtent.East, nextExtent.North);
foreach (RasterTileRegion region in tileRegions)
{
if (!details.LoadedTiles.ContainsKey(region.Tile.Identifier))
{
RequestTileLoad(details, level, region.Tile);
}
}
}
private void DrawBlock(VertexArray block, ClipmapLevel level, ClipmapLevel coarserLevel, int overallWest, int overallSouth, int blockWest, int blockSouth, Context context, SceneState sceneState)
{
int textureWest = blockWest - overallWest;
int textureSouth = blockSouth - overallSouth;
_patchOriginInClippedLevel.Value = new Vector2F(textureWest, textureSouth);
DrawState drawState = new DrawState(_renderState, _shaderProgram, block);
context.Draw(_primitiveType, drawState, sceneState);
}
public void UpdateTerrain(Context context, ClipmapUpdate update)
{
ClipmapLevel level = update.Level;
Update(context, update, level, _terrain, level.Terrain);
}