/// <summary>
/// Creates a frame buffer with a 1x1 RGB color attachment.
/// </summary>
public static Framebuffer CreateFramebuffer(Context context)
{
Framebuffer framebuffer = context.CreateFramebuffer();
framebuffer.ColorAttachments[0] = Device.CreateTexture2D(
new Texture2DDescription(1, 1, TextureFormat.RedGreenBlue8, false));
framebuffer.DepthAttachment = Device.CreateTexture2D(
new Texture2DDescription(1, 1, TextureFormat.Depth24, false));
return framebuffer;
}
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 HighResolutionSnapFramebuffer(Context context, double widthInInches, int dotsPerInch, double aspectRatio)
{
_widthInInches = widthInInches;
_dotsPerInch = dotsPerInch;
_aspectRatio = aspectRatio;
Texture2DDescription colorDescription = new Texture2DDescription(WidthInPixels, HeightInPixels, TextureFormat.RedGreenBlue8, false);
_colorTexture = Device.CreateTexture2D(colorDescription);
Texture2DDescription depthDescription = new Texture2DDescription(WidthInPixels, HeightInPixels, TextureFormat.Depth24, false);
_depthTexture = Device.CreateTexture2D(depthDescription);
_framebuffer = context.CreateFramebuffer();
_framebuffer.ColorAttachments[0] = _colorTexture;
_framebuffer.DepthAttachment = _depthTexture;
}
public HighResolutionSnapFramebuffer(Context context, double widthInInches, int dotsPerInch, double aspectRatio)
{
_widthInInches = widthInInches;
_dotsPerInch = dotsPerInch;
_aspectRatio = aspectRatio;
Texture2DDescription colorDescription = new Texture2DDescription(WidthInPixels, HeightInPixels, TextureFormat.RedGreenBlue8, false);
_colorTexture = Device.CreateTexture2D(colorDescription);
Texture2DDescription depthDescription = new Texture2DDescription(WidthInPixels, HeightInPixels, TextureFormat.Depth24, false);
_depthTexture = Device.CreateTexture2D(depthDescription);
_framebuffer = context.CreateFramebuffer();
_framebuffer.ColorAttachments[0] = _colorTexture;
_framebuffer.DepthAttachment = _depthTexture;
}
private void CreateDepthAndSilhouetteData(Context context)
{
if ((_depthTexture == null) || (_depthTexture.Description.Width != context.Viewport.Width) ||
(_depthTexture.Description.Height != context.Viewport.Height))
{
//
// Dispose as necessary
//
if (_depthTexture != null)
{
_depthTexture.Dispose();
}
if (_silhouetteTexture != null)
{
_silhouetteTexture.Dispose();
}
if (_colorTexture != null)
{
_colorTexture.Dispose();
}
//
// Textures
//
_depthTexture = Device.CreateTexture2D(new Texture2DDescription(context.Viewport.Width, context.Viewport.Height, TextureFormat.Depth24));
_silhouetteTexture = Device.CreateTexture2D(new Texture2DDescription(context.Viewport.Width, context.Viewport.Height, TextureFormat.Red8));
_colorTexture = Device.CreateTexture2D(new Texture2DDescription(context.Viewport.Width, context.Viewport.Height, TextureFormat.RedGreenBlue8));
//
// Terrain FBO
//
if (_terrainFramebuffer == null)
{
_terrainFramebuffer = context.CreateFramebuffer();
}
_terrainFramebuffer.DepthAttachment = _depthTexture;
_terrainFramebuffer.ColorAttachments[0] = _colorTexture;
//
// Silhouette FBO
//
if (_silhouetteFramebuffer == null)
{
_silhouetteFramebuffer = context.CreateFramebuffer();
}
_silhouetteFramebuffer.DepthAttachment = _depthTexture;
_silhouetteFramebuffer.ColorAttachments[0] = _silhouetteTexture;
}
}