public HeadsUpDisplay()
{
RenderState renderState = new RenderState();
renderState.FacetCulling.Enabled = false;
renderState.DepthTest.Enabled = false;
renderState.Blending.Enabled = true;
renderState.Blending.SourceRGBFactor = SourceBlendingFactor.SourceAlpha;
renderState.Blending.SourceAlphaFactor = SourceBlendingFactor.SourceAlpha;
renderState.Blending.DestinationRGBFactor = DestinationBlendingFactor.OneMinusSourceAlpha;
renderState.Blending.DestinationAlphaFactor = DestinationBlendingFactor.OneMinusSourceAlpha;
ShaderProgram sp = Device.CreateShaderProgram(
EmbeddedResources.GetText("OpenGlobe.Scene.Renderables.HeadsUpDisplay.Shaders.HeadsUpDisplayVS.glsl"),
EmbeddedResources.GetText("OpenGlobe.Scene.Renderables.HeadsUpDisplay.Shaders.HeadsUpDisplayGS.glsl"),
EmbeddedResources.GetText("OpenGlobe.Scene.Renderables.HeadsUpDisplay.Shaders.HeadsUpDisplayFS.glsl"));
_colorUniform = (Uniform<Vector3F>)sp.Uniforms["u_color"];
_originScaleUniform = (Uniform<Vector2F>)sp.Uniforms["u_originScale"];
_drawState = new DrawState(renderState, sp, null);
Color = Color.White;
HorizontalOrigin = HorizontalOrigin.Left;
VerticalOrigin = VerticalOrigin.Bottom;
_positionDirty = true;
}
protected void SetDrawAutomaticUniforms(Context context, DrawState drawState, SceneState sceneState)
{
for (int i = 0; i < _drawAutomaticUniforms.Count; ++i)
{
_drawAutomaticUniforms[i].Set(context, drawState, sceneState);
}
}
/// <summary>
/// Example code in the book.
/// </summary>
private static int CompareDrawStates(DrawState left, DrawState right)
{
// Sort by shader first
int leftShader = left.ShaderProgram.GetHashCode();
int rightShader = right.ShaderProgram.GetHashCode();
if (leftShader < rightShader)
{
return -1;
}
else if (leftShader > rightShader)
{
return 1;
}
// Shaders are equal, compare depth test enabled
int leftEnabled = Convert.ToInt32(left.RenderState.DepthTest.Enabled);
int rightEnabled = Convert.ToInt32(right.RenderState.DepthTest.Enabled);
if (leftEnabled < rightEnabled)
{
return -1;
}
else if (rightEnabled > leftEnabled)
{
return 1;
}
// Continue comparing other states in order of most to least expensive...
return 0;
}
public override void Set(Context context, DrawState drawState, SceneState sceneState)
{
//
// viewport.Bottom should really be used but Rectangle goes top to botom, not bottom to top.
//
Rectangle viewport = context.Viewport;
_uniform.Value = new Vector2F(1.0f / (float)viewport.Width, 1.0f / (float)viewport.Height);
}
public override void Set(Context context, DrawState drawState, SceneState sceneState)
{
_uniform.Value = new Vector4F(
sceneState.DiffuseIntensity,
sceneState.SpecularIntensity,
sceneState.AmbientIntensity,
sceneState.Shininess);
}
public Polyline()
{
_drawState = new DrawState();
_drawState.RenderState.FacetCulling.Enabled = false;
Show = true;
Width = 1;
}
public OutlinedPolylineGeometryShader()
{
_drawState = new DrawState();
_drawState.RenderState.FacetCulling.Enabled = false;
Width = 1;
OutlineWidth = 1;
}
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 ViewportQuad(Context context, string fs)
{
Verify.ThrowIfNull(context);
RenderState renderState = new RenderState();
renderState.FacetCulling.Enabled = false;
renderState.DepthTest.Enabled = false;
_drawState = new DrawState();
_drawState.RenderState = renderState;
_drawState.ShaderProgram = Device.CreateShaderProgram(
EmbeddedResources.GetText("OpenGlobe.Scene.Renderables.ViewportQuad.Shaders.ViewportQuadVS.glsl"),
fs == null ? EmbeddedResources.GetText("OpenGlobe.Scene.Renderables.ViewportQuad.Shaders.ViewportQuadFS.glsl") : fs);
_geometry = new ViewportQuadGeometry();
}
public OutlinedPolylineTexture()
{
RenderState renderState = new RenderState();
renderState.FacetCulling.Enabled = false;
renderState.Blending.Enabled = true;
renderState.Blending.SourceRGBFactor = SourceBlendingFactor.SourceAlpha;
renderState.Blending.SourceAlphaFactor = SourceBlendingFactor.SourceAlpha;
renderState.Blending.DestinationRGBFactor = DestinationBlendingFactor.OneMinusSourceAlpha;
renderState.Blending.DestinationAlphaFactor = DestinationBlendingFactor.OneMinusSourceAlpha;
_drawState = new DrawState();
_drawState.RenderState = renderState;
Width = 3;
OutlineWidth = 2;
}
public GPURelativeToEye(Context context, Vector3D[] positions, byte[] colors)
{
_sp = Device.CreateShaderProgram(
EmbeddedResources.GetText("OpenGlobe.Examples.GPURelativeToEye.Shaders.VS.glsl"),
EmbeddedResources.GetText("OpenGlobe.Examples.Shaders.FS.glsl"));
_cameraEyeHigh = (Uniform<Vector3F>)_sp.Uniforms["u_cameraEyeHigh"];
_cameraEyeLow = (Uniform<Vector3F>)_sp.Uniforms["u_cameraEyeLow"];
_modelViewPerspectiveMatrixRelativeToEye = (Uniform<Matrix4F>)(_sp.Uniforms["u_modelViewPerspectiveMatrixRelativeToEye"]);
_pointSize = (Uniform<float>)_sp.Uniforms["u_pointSize"];
///////////////////////////////////////////////////////////////////
Mesh mesh = new Mesh();
VertexAttributeFloatVector3 positionsHighAttribute = new VertexAttributeFloatVector3("positionHigh", positions.Length);
VertexAttributeFloatVector3 positionsLowAttribute = new VertexAttributeFloatVector3("positionLow", positions.Length);
VertexAttributeRGB colorAttribute = new VertexAttributeRGB("color", positions.Length);
mesh.Attributes.Add(positionsHighAttribute);
mesh.Attributes.Add(positionsLowAttribute);
mesh.Attributes.Add(colorAttribute);
for (int i = 0; i < positions.Length; ++i)
{
Vector3F positionHigh;
Vector3F positionLow;
Vector3DToTwoVector3F(positions[i], out positionHigh, out positionLow);
positionsHighAttribute.Values.Add(positionHigh);
positionsLowAttribute.Values.Add(positionLow);
}
for (int i = 0; i < colors.Length; ++i)
{
colorAttribute.Values.Add(colors[i]);
}
_va = context.CreateVertexArray(mesh, _sp.VertexAttributes, BufferHint.StaticDraw);
///////////////////////////////////////////////////////////////////
RenderState renderState = new RenderState();
renderState.FacetCulling.Enabled = false;
renderState.DepthTest.Enabled = false;
renderState.ProgramPointSize = ProgramPointSize.Enabled;
_drawState = new DrawState(renderState, _sp, _va);
}
public TessellatedGlobe()
{
ShaderProgram sp = Device.CreateShaderProgram(
EmbeddedResources.GetText("OpenGlobe.Scene.Globes.Tessellated.Shaders.GlobeVS.glsl"),
EmbeddedResources.GetText("OpenGlobe.Scene.Globes.Tessellated.Shaders.GlobeFS.glsl"));
_textured = (Uniform<bool>)sp.Uniforms["u_Textured"];
_logarithmicDepth = (Uniform<bool>)sp.Uniforms["u_logarithmicDepth"];
_logarithmicDepthConstant = (Uniform<float>)sp.Uniforms["u_logarithmicDepthConstant"];
LogarithmicDepthConstant = 1;
_drawState = new DrawState();
_drawState.ShaderProgram = sp;
Shape = Ellipsoid.ScaledWgs84;
NumberOfSlicePartitions = 32;
NumberOfStackPartitions = 16;
}
public DayNightViewportQuad(Context context)
{
Verify.ThrowIfNull(context);
RenderState renderState = new RenderState();
renderState.FacetCulling.Enabled = false;
renderState.DepthTest.Enabled = false;
ShaderProgram sp = Device.CreateShaderProgram(
EmbeddedResources.GetText("OpenGlobe.Scene.Globes.DayNight.Shaders.ViewportQuadVS.glsl"),
EmbeddedResources.GetText("OpenGlobe.Scene.Globes.DayNight.Shaders.ViewportQuadFS.glsl"));
_dayNightOutput = (Uniform<int>)sp.Uniforms["u_DayNightOutput"];
_drawState = new DrawState();
_drawState.RenderState = renderState;
_drawState.ShaderProgram = sp;
_geometry = new ViewportQuadGeometry();
}
public DayNightGlobe(Context context)
{
Verify.ThrowIfNull(context);
ShaderProgram sp = Device.CreateShaderProgram(
EmbeddedResources.GetText("OpenGlobe.Scene.Globes.DayNight.Shaders.GlobeVS.glsl"),
EmbeddedResources.GetText("OpenGlobe.Scene.Globes.DayNight.Shaders.GlobeFS.glsl"));
_cameraEyeSquaredSP = (Uniform<Vector3F>)sp.Uniforms["u_cameraEyeSquared"];
_useAverageDepth = (Uniform<bool>)sp.Uniforms["u_useAverageDepth"];
float blendDurationScale = 0.1f;
((Uniform<float>)sp.Uniforms["u_blendDuration"]).Value = blendDurationScale;
((Uniform<float>)sp.Uniforms["u_blendDurationScale"]).Value = 1 / (2 * blendDurationScale);
_drawState = new DrawState();
_drawState.ShaderProgram = sp;
Shape = Ellipsoid.ScaledWgs84;
ShowGlobe = true;
}
public RayCastedTerrainTile(TerrainTile tile)
{
ShaderProgram sp = Device.CreateShaderProgram(
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.RayCastedTerrainTile.TerrainVS.glsl"),
EmbeddedResources.GetText("OpenGlobe.Scene.Terrain.RayCastedTerrainTile.TerrainFS.glsl"));
_tileResolution = tile.Resolution;
_tileMinimumHeight = tile.MinimumHeight;
_tileMaximumHeight = tile.MaximumHeight;
_tileAABBLowerLeft = Vector3D.Zero; // TEXEL_SPACE_TODO
_tileAABBUpperRight = new Vector3D(tile.Resolution.X, tile.Resolution.Y,
tile.MaximumHeight - tile.MinimumHeight);
_heightExaggeration = (Uniform<float>)sp.Uniforms["u_heightExaggeration"];
_minimumHeight = (Uniform<float>)sp.Uniforms["u_minimumHeight"];
_maximumHeight = (Uniform<float>)sp.Uniforms["u_maximumHeight"];
_aabbLowerLeft = (Uniform<Vector3F>)sp.Uniforms["u_aabbLowerLeft"];
_aabbUpperRight = (Uniform<Vector3F>)sp.Uniforms["u_aabbUpperRight"];
_shadingAlgorithm = (Uniform<int>)sp.Uniforms["u_shadingAlgorithm"];
HeightExaggeration = 1;
///////////////////////////////////////////////////////////////////
_drawState = new DrawState();
_drawState.RenderState.FacetCulling.Face = CullFace.Front;
_drawState.ShaderProgram = sp;
//
// 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);
ShowTerrain = true;
}
public override void Set(Context context, DrawState drawState, SceneState sceneState)
{
Camera camera = sceneState.Camera;
double theta = camera.FieldOfViewX * 0.5;
double phi = camera.FieldOfViewY * 0.5;
double nearDistance = camera.PerspectiveNearPlaneDistance;
//
// Coordinate system for the near plane: origin is at center, x and y
// span [-1, 1] just like noramlized device coordinates.
//
Vector3D origin = camera.Eye + (nearDistance * camera.Forward); // Project eye onto near plane
Vector3D xAxis = camera.Right * (nearDistance * Math.Tan(theta)); // Rescale right to near plane
Vector3D yAxis = camera.Up * (nearDistance * Math.Tan(phi)); // Rescale up to near plane
_uniform.Value = new Matrix4D(
xAxis.X, yAxis.X, 0.0, origin.X,
xAxis.Y, yAxis.Y, 0.0, origin.Y,
xAxis.Z, yAxis.Z, 0.0, origin.Z,
0.0, 0.0, 0.0, 1.0).ToMatrix4F();
}
public Wireframe(Context context, Mesh mesh)
{
RenderState renderState = new RenderState();
renderState.Blending.Enabled = true;
renderState.Blending.SourceRGBFactor = SourceBlendingFactor.SourceAlpha;
renderState.Blending.SourceAlphaFactor = SourceBlendingFactor.SourceAlpha;
renderState.Blending.DestinationRGBFactor = DestinationBlendingFactor.OneMinusSourceAlpha;
renderState.Blending.DestinationAlphaFactor = DestinationBlendingFactor.OneMinusSourceAlpha;
renderState.FacetCulling.FrontFaceWindingOrder = mesh.FrontFaceWindingOrder;
renderState.DepthTest.Function = DepthTestFunction.LessThanOrEqual;
//
// This implementation is based on the 2006 SIGGRAPH Sketch:
//
// Single-pass Wireframe Rendering
// http://www2.imm.dtu.dk/pubdb/views/edoc_download.php/4884/pdf/imm4884.pdf
//
// NVIDIA published a white paper with some enhancements we can consider:
//
// Solid Wireframe
// http://developer.download.nvidia.com/SDK/10.5/direct3d/Source/SolidWireframe/Doc/SolidWireframe.pdf
//
// More recent work, which I was not aware of at the time, is:
//
// Two Methods for Antialiased Wireframe Drawing with Hidden Line Removal
// http://orbit.dtu.dk/getResource?recordId=219956&objectId=1&versionId=1
//
ShaderProgram sp = Device.CreateShaderProgram(
EmbeddedResources.GetText("OpenGlobe.Scene.Renderables.Wireframe.Shaders.WireframeVS.glsl"),
EmbeddedResources.GetText("OpenGlobe.Scene.Renderables.Wireframe.Shaders.WireframeGS.glsl"),
EmbeddedResources.GetText("OpenGlobe.Scene.Renderables.Wireframe.Shaders.WireframeFS.glsl"));
_lineWidth = (Uniform<float>)sp.Uniforms["u_halfLineWidth"];
Width = 1;
_colorUniform = (Uniform<Vector3F>)sp.Uniforms["u_color"];
Color = Color.Black;
_drawState = new DrawState(renderState, sp, context.CreateVertexArray(mesh, sp.VertexAttributes, BufferHint.StaticDraw));
_primitiveType = mesh.PrimitiveType;
}
public CPURelativeToEye(Context context, Vector3D[] positions, byte[] colors)
{
_sp = Device.CreateShaderProgram(
EmbeddedResources.GetText("OpenGlobe.Examples.CPURelativeToEye.Shaders.VS.glsl"),
EmbeddedResources.GetText("OpenGlobe.Examples.Shaders.FS.glsl"));
_modelViewPerspectiveMatrixRelativeToEye = (Uniform<Matrix4F>)(_sp.Uniforms["u_modelViewPerspectiveMatrixRelativeToEye"]);
_pointSize = (Uniform<float>)_sp.Uniforms["u_pointSize"];
///////////////////////////////////////////////////////////////////
_positions = new Vector3D[positions.Length];
positions.CopyTo(_positions, 0);
_positionsRelativeToEye = new Vector3F[_positions.Length];
_eye = Vector3D.Zero;
//
// _positionBuffer is dynamic, and is written to when the camera moves.
//
_positionBuffer = Device.CreateVertexBuffer(BufferHint.DynamicDraw, ArraySizeInBytes.Size(_positionsRelativeToEye));
_colorBuffer = Device.CreateVertexBuffer(BufferHint.StaticDraw, colors.Length);
_colorBuffer.CopyFromSystemMemory(colors);
_va = context.CreateVertexArray();
_va.Attributes[_sp.VertexAttributes["position"].Location] =
new VertexBufferAttribute(_positionBuffer, ComponentDatatype.Float, 3);
_va.Attributes[_sp.VertexAttributes["color"].Location] =
new VertexBufferAttribute(_colorBuffer, ComponentDatatype.UnsignedByte, 3, true, 0, 0);
///////////////////////////////////////////////////////////////////
RenderState renderState = new RenderState();
renderState.FacetCulling.Enabled = false;
renderState.DepthTest.Enabled = false;
renderState.ProgramPointSize = ProgramPointSize.Enabled;
_drawState = new DrawState(renderState, _sp, _va);
}
public RelativeToCenter(Context context, Vector3D[] positions, byte[] colors)
{
_sp = Device.CreateShaderProgram(
EmbeddedResources.GetText("OpenGlobe.Examples.RelativeToCenter.Shaders.VS.glsl"),
EmbeddedResources.GetText("OpenGlobe.Examples.Shaders.FS.glsl"));
_modelViewPerspectiveMatrixRelativeToCenter = (Uniform<Matrix4F>)(_sp.Uniforms["u_modelViewPerspectiveMatrixRelativeToCenter"]);
_pointSize = (Uniform<float>)_sp.Uniforms["u_pointSize"];
///////////////////////////////////////////////////////////////////
Mesh mesh = new Mesh();
VertexAttributeFloatVector3 positionsAttribute = new VertexAttributeFloatVector3("position", positions.Length);
VertexAttributeRGB colorAttribute = new VertexAttributeRGB("color", positions.Length);
mesh.Attributes.Add(positionsAttribute);
mesh.Attributes.Add(colorAttribute);
_center = new AxisAlignedBoundingBox(positions).Center;
for (int i = 0; i < positions.Length; ++i)
{
positionsAttribute.Values.Add((positions[i] - _center).ToVector3F());
}
for (int i = 0; i < colors.Length; ++i)
{
colorAttribute.Values.Add(colors[i]);
}
_va = context.CreateVertexArray(mesh, _sp.VertexAttributes, BufferHint.StaticDraw);
///////////////////////////////////////////////////////////////////
RenderState renderState = new RenderState();
renderState.FacetCulling.Enabled = false;
renderState.DepthTest.Enabled = false;
renderState.ProgramPointSize = ProgramPointSize.Enabled;
_drawState = new DrawState(renderState, _sp, _va);
}
public RayCastedGlobe(Context context)
{
Verify.ThrowIfNull(context);
_renderState = new RenderState();
_renderState.FacetCulling.Face = CullFace.Front;
string vs = EmbeddedResources.GetText("OpenGlobe.Scene.Globes.RayCasted.Shaders.GlobeVS.glsl");
ShaderProgram sp = Device.CreateShaderProgram(vs, EmbeddedResources.GetText("OpenGlobe.Scene.Globes.RayCasted.Shaders.GlobeFS.glsl"));
_cameraEyeSquared = (Uniform<Vector3F>)sp.Uniforms["u_cameraEyeSquared"];
_useAverageDepth = (Uniform<bool>)sp.Uniforms["u_useAverageDepth"];
ShaderProgram solidSP = Device.CreateShaderProgram(vs, EmbeddedResources.GetText("OpenGlobe.Scene.Globes.RayCasted.Shaders.SolidShadedGlobeFS.glsl"));
_cameraEyeSquaredSolid = (Uniform<Vector3F>)solidSP.Uniforms["u_cameraEyeSquared"];
_useAverageDepthSolid = (Uniform<bool>)solidSP.Uniforms["u_useAverageDepth"];
_drawState = new DrawState(_renderState, sp, null);
_drawStateSolid = new DrawState(_renderState, solidSP, null);
Shape = Ellipsoid.ScaledWgs84;
Shade = true;
ShowGlobe = true;
}
public abstract void Draw(PrimitiveType primitiveType, int offset, int count, DrawState drawState, SceneState sceneState);
public abstract void Draw(PrimitiveType primitiveType, DrawState drawState, SceneState sceneState);
public override void Set(Context context, DrawState drawState, SceneState sceneState)
{
_uniform.Value = (float)(Math.Tan(0.5 * sceneState.Camera.FieldOfViewY) * 2.0 / context.Viewport.Height);
}
public override void Set(Context context, DrawState drawState, SceneState sceneState)
{
_uniform.Value = SceneState.ComputeViewportOrthographicMatrix(context.Viewport).ToMatrix4F();
}
public override void Set(Context context, DrawState drawState, SceneState sceneState)
{
_uniform.Value = (float)(Math.Tan(0.5 * sceneState.Camera.FieldOfViewY) * 2.0 / context.Viewport.Height);
}
public override void Set(Context context, DrawState drawState, SceneState sceneState)
{
_uniform.Value = sceneState.Camera.Eye.ToVector3F();
}
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 override void Set(Context context, DrawState drawState, SceneState sceneState)
{
_uniform.Value = sceneState.ComputeViewportTransformationMatrix(context.Viewport,
drawState.RenderState.DepthRange.Near, drawState.RenderState.DepthRange.Far).ToMatrix4F();
}
public override void Set(Context context, DrawState drawState, SceneState sceneState)
{
_uniform.Value = Matrix42 <float> .DoubleToFloat(sceneState.ModelZToClipCoordinates);
}
public override void Set(Context context, DrawState drawState, SceneState sceneState)
{
_uniform.Value = (float)sceneState.Camera.Height(Ellipsoid.Wgs84);
}
public override void Set(Context context, DrawState drawState, SceneState sceneState)
{
_uniform.Value = sceneState.ModelViewPerspectiveMatrixRelativeToEye.ToMatrix4F();
}
public override void Set(Context context, DrawState drawState, SceneState sceneState)
{
_uniform.Value = sceneState.ComputeViewportTransformationMatrix(context.Viewport,
drawState.RenderState.DepthRange.Near, drawState.RenderState.DepthRange.Far).ToMatrix4F();
}
public override void Set(Context context, DrawState drawState, SceneState sceneState)
{
_uniform.Value = sceneState.ModelViewPerspectiveMatrixRelativeToEye.ToMatrix4F();
}
public override void Set(Context context, DrawState drawState, SceneState sceneState)
{
_uniform.Value = sceneState.ViewMatrix.ToMatrix4F();
}
public override void Set(Context context, DrawState drawState, SceneState sceneState)
{
_uniform.Value = sceneState.OrthographicMatrix.ToMatrix4F();
}
public void Set(Context context, IList<Vector3D> positions)
{
//
// This method expects that the positions are ordered in a repeated pattern of
// below terrain, above terrain pairs.
//
// Wall mesh
//
Mesh wallMesh = new Mesh();
wallMesh.PrimitiveType = PrimitiveType.TriangleStrip;
//
// Positions
//
int numberOfLineSegments = (positions.Count / 2) - 1;
int numberOfVertices = 2 + numberOfLineSegments + numberOfLineSegments;
VertexAttributeDoubleVector3 positionsAttribute = new VertexAttributeDoubleVector3("position", numberOfVertices);
IList<Vector3D> tempPositions = positionsAttribute.Values;
wallMesh.Attributes.Add(positionsAttribute);
foreach (Vector3D v in positions)
{
tempPositions.Add(v);
}
//
// Vertex array
//
_wallVA = context.CreateVertexArray(wallMesh, _wallSP.VertexAttributes, BufferHint.StaticDraw);
//
// Line mesh
//
Mesh lineMesh = new Mesh();
lineMesh.PrimitiveType = PrimitiveType.LineStrip;
//
// Positions
//
positionsAttribute = new VertexAttributeDoubleVector3("position", numberOfVertices);
tempPositions = positionsAttribute.Values;
lineMesh.Attributes.Add(positionsAttribute);
foreach (Vector3D v in positions)
{
tempPositions.Add(v);
}
//
// Indices
//
int numIndices = 4 * numberOfLineSegments;
ushort[] indices = new ushort[numIndices];
int baseIndex = 1;
for (int i = 0; i < numIndices; i += 4, baseIndex += 2)
{
indices[i] = (ushort)baseIndex;
indices[i + 1] = (ushort)(baseIndex - 1);
indices[i + 2] = (ushort)(baseIndex + 1);
indices[i + 3] = (ushort)(baseIndex + 2);
}
IndexBuffer indexBuffer = Device.CreateIndexBuffer(BufferHint.StaticDraw, numIndices * sizeof(ushort));
indexBuffer.CopyFromSystemMemory(indices);
//
// Vertex array
//
_lineVA = context.CreateVertexArray(lineMesh, _wallSP.VertexAttributes, BufferHint.StaticDraw);
_lineVA.IndexBuffer = indexBuffer;
//
// State
//
_wallDrawState = new DrawState();
_wallDrawState.RenderState.FacetCulling.Enabled = false;
_wallDrawState.RenderState.DepthTest.Enabled = false;
_wallDrawState.RenderState.DepthMask = false;
_wallDrawState.VertexArray = _lineVA;
_wallDrawState.ShaderProgram = _wallSP;
_shadowVolumePassOne = new DrawState();
_shadowVolumePassOne.VertexArray = _lineVA;
_shadowVolumePassOne.ShaderProgram = _shadowVolumeSP;
_shadowVolumePassOne.RenderState.FacetCulling.Enabled = false;
_shadowVolumePassOne.RenderState.DepthMask = false;
_shadowVolumePassOne.RenderState.ColorMask = new ColorMask(false, false, false, false);
StencilTest stOne = _shadowVolumePassOne.RenderState.StencilTest;
stOne.Enabled = true;
stOne.FrontFace.DepthFailStencilPassOperation = StencilOperation.Decrement;
stOne.BackFace.DepthFailStencilPassOperation = StencilOperation.Increment;
_shadowVolumePassTwo = new DrawState();
_shadowVolumePassTwo.VertexArray = _lineVA;
_shadowVolumePassTwo.ShaderProgram = _shadowVolumeSP;
_shadowVolumePassTwo.RenderState.DepthMask = false;
StencilTest stTwo = _shadowVolumePassTwo.RenderState.StencilTest;
stTwo.Enabled = true;
stTwo.FrontFace.DepthFailStencilPassOperation = StencilOperation.Zero;
stTwo.FrontFace.DepthPassStencilPassOperation = StencilOperation.Zero;
stTwo.FrontFace.Function = StencilTestFunction.NotEqual;
stTwo.BackFace.DepthFailStencilPassOperation = StencilOperation.Zero;
stTwo.BackFace.DepthPassStencilPassOperation = StencilOperation.Zero;
stTwo.BackFace.Function = StencilTestFunction.NotEqual;
}
public NightLights()
{
_window = Device.CreateWindow(800, 600, "Chapter 4: Night Lights");
_window.Resize += OnResize;
_window.RenderFrame += OnRenderFrame;
_sceneState = new SceneState();
_camera = new CameraLookAtPoint(_sceneState.Camera, _window, Ellipsoid.ScaledWgs84);
_clearState = new ClearState();
string vs =
@"#version 330
layout(location = og_positionVertexLocation) in vec4 position;
out vec3 worldPosition;
out vec3 positionToLight;
out vec3 positionToEye;
uniform mat4 og_modelViewPerspectiveMatrix;
uniform vec3 og_cameraEye;
uniform vec3 og_sunPosition;
void main()
{
gl_Position = og_modelViewPerspectiveMatrix * position;
worldPosition = position.xyz;
positionToLight = og_sunPosition - worldPosition;
positionToEye = og_cameraEye - worldPosition;
}";
string fs =
@"#version 330
in vec3 worldPosition;
in vec3 positionToLight;
in vec3 positionToEye;
out vec3 fragmentColor;
uniform vec4 og_diffuseSpecularAmbientShininess;
uniform sampler2D og_texture0; // Day
uniform sampler2D og_texture1; // Night
uniform float u_blendDuration;
uniform float u_blendDurationScale;
float LightIntensity(vec3 normal, vec3 toLight, vec3 toEye, float diffuseDot, vec4 diffuseSpecularAmbientShininess)
{
vec3 toReflectedLight = reflect(-toLight, normal);
float diffuse = max(diffuseDot, 0.0);
float specular = max(dot(toReflectedLight, toEye), 0.0);
specular = pow(specular, diffuseSpecularAmbientShininess.w);
return (diffuseSpecularAmbientShininess.x * diffuse) +
(diffuseSpecularAmbientShininess.y * specular) +
diffuseSpecularAmbientShininess.z;
}
vec2 ComputeTextureCoordinates(vec3 normal)
{
return vec2(atan(normal.y, normal.x) * og_oneOverTwoPi + 0.5, asin(normal.z) * og_oneOverPi + 0.5);
}
vec3 NightColor(vec3 normal)
{
return texture(og_texture1, ComputeTextureCoordinates(normal)).rgb;
}
vec3 DayColor(vec3 normal, vec3 toLight, vec3 toEye, float diffuseDot, vec4 diffuseSpecularAmbientShininess)
{
float intensity = LightIntensity(normal, toLight, toEye, diffuseDot, diffuseSpecularAmbientShininess);
return intensity * texture(og_texture0, ComputeTextureCoordinates(normal)).rgb;
}
void main()
{
vec3 normal = normalize(worldPosition);
vec3 toLight = normalize(positionToLight);
float diffuse = dot(toLight, normal);
if (diffuse > u_blendDuration)
{
fragmentColor = DayColor(normal, toLight, normalize(positionToEye), diffuse, og_diffuseSpecularAmbientShininess);
}
else if (diffuse < -u_blendDuration)
{
fragmentColor = NightColor(normal);
}
else
{
vec3 night = NightColor(normal);
vec3 day = DayColor(normal, toLight, normalize(positionToEye), diffuse, og_diffuseSpecularAmbientShininess);
fragmentColor = mix(night, day, (diffuse + u_blendDuration) * u_blendDurationScale);
}
}";
ShaderProgram sp = Device.CreateShaderProgram(vs, fs);
float blendDurationScale = 0.1f;
((Uniform<float>)sp.Uniforms["u_blendDuration"]).Value = blendDurationScale;
((Uniform<float>)sp.Uniforms["u_blendDurationScale"]).Value = 1 / (2 * blendDurationScale);
Mesh mesh = SubdivisionEllipsoidTessellator.Compute(Ellipsoid.ScaledWgs84, 5, SubdivisionEllipsoidVertexAttributes.Position);
VertexArray va = _window.Context.CreateVertexArray(mesh, sp.VertexAttributes, BufferHint.StaticDraw);
_primitiveType = mesh.PrimitiveType;
RenderState renderState = new RenderState();
renderState.FacetCulling.FrontFaceWindingOrder = mesh.FrontFaceWindingOrder;
_drawState = new DrawState(renderState, sp, va);
Bitmap dayBitmap = new Bitmap("world.topo.200412.3x5400x2700.jpg");
_dayTexture = Device.CreateTexture2D(dayBitmap, TextureFormat.RedGreenBlue8, false);
Bitmap nightBitmap = new Bitmap("land_ocean_ice_lights_2048.jpg");
_nightTexture = Device.CreateTexture2D(nightBitmap, TextureFormat.RedGreenBlue8, false);
_sceneState.DiffuseIntensity = 0.5f;
_sceneState.SpecularIntensity = 0.15f;
_sceneState.AmbientIntensity = 0.35f;
_sceneState.Camera.ZoomToTarget(1);
}
public override void Set(Context context, DrawState drawState, SceneState sceneState)
{
_uniform.Value = sceneState.ModelViewOrthographicMatrix.ToMatrix4F();
}
public override void Set(Context context, DrawState drawState, SceneState sceneState)
{
_uniform.Value = sceneState.CameraLightPosition.ToVector3F();
}
public override void Set(Context context, DrawState drawState, SceneState sceneState)
{
_uniform.Value = sceneState.PerspectiveMatrix.ToMatrix4F();
}
public override void Set(Context context, DrawState drawState, SceneState sceneState)
{
_uniform.Value = sceneState.Camera.EyeHigh;
}
public override void Set(Context context, DrawState drawState, SceneState sceneState)
{
_uniform.Value = SceneState.ComputeViewportOrthographicMatrix(context.Viewport).ToMatrix4F();
}
