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);
}
public VertexDisplacementMapTerrainTile(Context context, TerrainTile tile)
{
//
// Upload height map as a one channel floating point texture
//
WritePixelBuffer pixelBuffer = Device.CreateWritePixelBuffer(PixelBufferHint.Stream,
sizeof(float) * tile.Heights.Length);
pixelBuffer.CopyFromSystemMemory(tile.Heights);
_texture = Device.CreateTexture2DRectangle(new Texture2DDescription(
tile.Resolution.X, tile.Resolution.Y, TextureFormat.Red32f));
_texture.CopyFromBuffer(pixelBuffer, ImageFormat.Red, ImageDatatype.Float);
///////////////////////////////////////////////////////////////////
ShaderProgram spTerrain = Device.CreateShaderProgram(
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.VertexDisplacementMapTerrainTile.TerrainVS.glsl"),
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.VertexDisplacementMapTerrainTile.TerrainFS.glsl"));
_heightExaggerationUniform = (Uniform <float>)spTerrain.Uniforms["u_heightExaggeration"];
((Uniform <Vector2F>)spTerrain.Uniforms["u_positionToTextureCoordinate"]).Value = new Vector2F(
(float)(1.0 / (double)(tile.Resolution.X)),
(float)(1.0 / (double)(tile.Resolution.Y)));
((Uniform <Vector2F>)spTerrain.Uniforms["u_positionToRepeatTextureCoordinate"]).Value = new Vector2F(
(float)(4.0 / (double)tile.Resolution.X),
(float)(4.0 / (double)tile.Resolution.Y));
///////////////////////////////////////////////////////////////////
ShaderProgram spNormals = Device.CreateShaderProgram(
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.VertexDisplacementMapTerrainTile.NormalsVS.glsl"),
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.VertexDisplacementMapTerrainTile.NormalsGS.glsl"),
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.VertexDisplacementMapTerrainTile.NormalsFS.glsl"));
_heightExaggerationNormals = (Uniform <float>)spNormals.Uniforms["u_heightExaggeration"];
_fillDistanceNormals = (Uniform <float>)spNormals.Uniforms["u_fillDistance"];
((Uniform <Vector3F>)spNormals.Uniforms["u_color"]).Value = Vector3F.Zero;
///////////////////////////////////////////////////////////////////
ShaderProgram spWireframe = Device.CreateShaderProgram(
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.VertexDisplacementMapTerrainTile.WireframeVS.glsl"),
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.VertexDisplacementMapTerrainTile.WireframeGS.glsl"),
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.VertexDisplacementMapTerrainTile.WireframeFS.glsl"));
_lineWidthWireframe = (Uniform <float>)spWireframe.Uniforms["u_halfLineWidth"];
_heightExaggerationWireframe = (Uniform <float>)spWireframe.Uniforms["u_heightExaggeration"];
((Uniform <Vector3F>)spWireframe.Uniforms["u_color"]).Value = Vector3F.Zero;
///////////////////////////////////////////////////////////////////
Mesh mesh = RectangleTessellator.Compute(new RectangleD(new Vector2D(0.5, 0.5),
new Vector2D((double)tile.Resolution.X - 0.5, (double)tile.Resolution.Y - 0.5)),
tile.Resolution.X - 1, tile.Resolution.Y - 1);
_va = context.CreateVertexArray(mesh, spWireframe.VertexAttributes, BufferHint.StaticDraw);
_primitiveType = mesh.PrimitiveType;
///////////////////////////////////////////////////////////////////
RenderState rsTerrain = new RenderState();
rsTerrain.FacetCulling.FrontFaceWindingOrder = mesh.FrontFaceWindingOrder;
RenderState rsWireframe = new RenderState();
rsWireframe.Blending.Enabled = true;
rsWireframe.Blending.SourceRGBFactor = SourceBlendingFactor.SourceAlpha;
rsWireframe.Blending.SourceAlphaFactor = SourceBlendingFactor.SourceAlpha;
rsWireframe.Blending.DestinationRGBFactor = DestinationBlendingFactor.OneMinusSourceAlpha;
rsWireframe.Blending.DestinationAlphaFactor = DestinationBlendingFactor.OneMinusSourceAlpha;
rsWireframe.FacetCulling.FrontFaceWindingOrder = mesh.FrontFaceWindingOrder;
rsWireframe.DepthTest.Function = DepthTestFunction.LessThanOrEqual;
RenderState rsNormals = new RenderState();
rsNormals.FacetCulling.Enabled = false;
rsNormals.Blending.Enabled = true;
rsNormals.Blending.SourceRGBFactor = SourceBlendingFactor.SourceAlpha;
rsNormals.Blending.SourceAlphaFactor = SourceBlendingFactor.SourceAlpha;
rsNormals.Blending.DestinationRGBFactor = DestinationBlendingFactor.OneMinusSourceAlpha;
rsNormals.Blending.DestinationAlphaFactor = DestinationBlendingFactor.OneMinusSourceAlpha;
///////////////////////////////////////////////////////////////////
_drawStateTerrain = new DrawState(rsTerrain, spTerrain, _va);
_drawStateWireframe = new DrawState(rsWireframe, spWireframe, _va);
_drawStateNormals = new DrawState(rsNormals, spNormals, _va);
_tileMinimumHeight = tile.MinimumHeight;
_tileMaximumHeight = tile.MaximumHeight;
_heightExaggeration = 1;
_normalsAlgorithm = TerrainNormalsAlgorithm.ForwardDifference;
_showTerrain = true;
_dirty = true;
}
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;
}
