/// <summary>
///
/// </summary>
/// <param name="isClear">Execute gl.ClearColor() and gl.Clear() if true.</param>
public ColorCodedPickingScene(SharedStageInfo stagetInfo = null, bool isClear = true)
{
if (stagetInfo != null)
{
this.StageInfo = stagetInfo;
}
else
{
this.StageInfo = new SharedStageInfo();
}
this.IsClear = isClear;
}
/// <summary>
/// Draw the scene.
/// </summary>
/// <param name="renderMode">Use Render for normal rendering and HitTest for picking.</param>
/// <param name="camera">Keep this to null if <see cref="CurrentCamera"/> is already set up.</param>
public void Draw(RenderMode renderMode = RenderMode.Render, SceneGraph.Cameras.Camera camera = null)
{
var gl = OpenGL;
if (gl == null)
{
return;
}
// TODO: we must decide what to do about drawing - are
// cameras completely outside of the responsibility of the scene?
// If no camera has been provided, use the current one.
if (camera == null)
{
camera = CurrentCamera;
}
if (IsClear)
{
if (renderMode == RenderMode.HitTest)
{
// When picking on a position that no model exists,
// the picked color would be
// = 255
// + 255 << 8
// + 255 << 16
// + 255 << 24
// = 255
// + 65280
// + 16711680
// + 4278190080
// = 4294967295
// This makes it easier to determin whether we picked something or not.
gl.ClearColor(1, 1, 1, 1);
}
else
{
// Set the clear color.
float[] clear = (SharpGL.SceneGraph.GLColor)ClearColor;
gl.ClearColor(clear[0], clear[1], clear[2], clear[3]);
}
}
// Reproject.
if (camera != null)
{
camera.Project(gl);
}
if (IsClear)
{
// Clear.
gl.Clear(OpenGL.GL_COLOR_BUFFER_BIT | OpenGL.GL_DEPTH_BUFFER_BIT |
OpenGL.GL_STENCIL_BUFFER_BIT);
}
//gl.BindTexture(OpenGL.GL_TEXTURE_2D, 0);
SharedStageInfo info = this.StageInfo;
info.Reset();
// Render the root element, this will then render the whole
// of the scene tree.
MyRenderElement(SceneContainer, gl, renderMode, info);
// TODO: Adding this code here re-enables textures- it should work without it but it
// doesn't, look into this.
//gl.BindTexture(OpenGL.GL_TEXTURE_2D, 0);
//gl.Enable(OpenGL.GL_TEXTURE_2D);
gl.Flush();
}
//public override void Draw(SceneGraph.Cameras.Camera camera = null)
//{
// this.Draw(camera, RenderMode.Design);
//}
/// <summary>
/// Renders the element.
/// </summary>
/// <param name="gl">The gl.</param>
/// <param name="renderMode">The render mode.</param>
public void MyRenderElement(SceneElement sceneElement, OpenGL gl, RenderMode renderMode, SharedStageInfo info)
{
// If the element is disabled, we're done.
if (sceneElement.IsEnabled == false)
{
return;
}
// Push each effect.
foreach (var effect in sceneElement.Effects)
{
if (effect.IsEnabled)
{
effect.Push(gl, sceneElement);
}
}
// If the element can be bound, bind it.
IBindable bindable = sceneElement as IBindable;// example: Light
if (bindable != null)
{
bindable.Push(gl);
}
// If the element has an object space, transform into it.
IHasObjectSpace hasObjectSpace = sceneElement as IHasObjectSpace;// example: Polygon, quadric, Teapot
if (hasObjectSpace != null)
{
hasObjectSpace.PushObjectSpace(gl);
}
// Render self.
{
// If the element has a material, push it.
IHasMaterial hasMaterial = sceneElement as IHasMaterial;// example: Polygon, quadric, Teapot
if (hasMaterial != null && hasMaterial.Material != null)
{
hasMaterial.Material.Push(gl);
}
if (renderMode == RenderMode.HitTest)
{
IColorCodedPicking picking = sceneElement as IColorCodedPicking;
info.RenderForPicking(picking, gl, renderMode);
}
else
{
// If the element can be rendered, render it.
IRenderable renderable = sceneElement as IRenderable;
if (renderable != null)
{
renderable.Render(gl, renderMode);
}
}
// If the element has a material, pop it.
if (hasMaterial != null && hasMaterial.Material != null)
{
hasMaterial.Material.Pop(gl);
}
}
// If the element is volume bound and we are rendering volumes, render the volume.
IVolumeBound volumeBound = null;
if (RenderBoundingVolumes)
{
volumeBound = sceneElement as IVolumeBound;
if (volumeBound != null)
{
volumeBound.BoundingVolume.Render(gl, renderMode);
}
}
// Recurse through the children.
foreach (var childElement in sceneElement.Children)
{
MyRenderElement(childElement, gl, renderMode, info);
}
// If the element has an object space, transform out of it.
if (hasObjectSpace != null)
{
hasObjectSpace.PopObjectSpace(gl);
}
// If the element can be bound, bind it.
if (bindable != null)
{
bindable.Pop(gl);
}
// Pop each effect.
for (int i = sceneElement.Effects.Count - 1; i >= 0; i--)
{
if (sceneElement.Effects[i].IsEnabled)
{
sceneElement.Effects[i].Pop(gl, sceneElement);
}
}
}
