예제 #1
0
        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;
        }
예제 #2
0
        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;
        }