/// <summary>
/// 在多个buffer中拾取一个图元
/// </summary>
/// <param name="arg"></param>
/// <param name="pickableElements"></param>
public static void Render4Picking(RenderEventArgs arg, params PickableRenderer[] pickableElements)
{
if (arg.RenderMode != RenderModes.ColorCodedPicking)
{
throw new ArgumentException();
}
// record clear color
var originalClearColor = new float[4];
OpenGL.GetFloat(GetTarget.ColorClearValue, originalClearColor);
// 白色意味着没有拾取到任何对象
// white color: nothing picked.
OpenGL.ClearColor(1.0f, 1.0f, 1.0f, 1.0f);
OpenGL.Clear(OpenGL.GL_COLOR_BUFFER_BIT | OpenGL.GL_DEPTH_BUFFER_BIT | OpenGL.GL_STENCIL_BUFFER_BIT);
// restore clear color
OpenGL.ClearColor(originalClearColor[0], originalClearColor[1], originalClearColor[2], originalClearColor[3]);
uint renderedVertexCount = 0;
foreach (var pickable in pickableElements)
{
if (pickable == null)
{
continue;
}
pickable.PickingBaseId = renderedVertexCount;
// render the element for picking.
pickable.Render(arg);
uint rendered = renderedVertexCount + pickable.GetVertexCount();
if (renderedVertexCount <= rendered)
{
renderedVertexCount = rendered;
}
else
{
throw new Exception(string.Format(
"Too many geometries({0} + {1} > {2}) for color coded picking.",
renderedVertexCount, pickable.GetVertexCount(), uint.MaxValue));
}
}
OpenGL.Flush();
}
protected override void OnPaint(PaintEventArgs e)
{
RenderContext renderContext = this.renderContext;
if (renderContext == null)
{
base.OnPaint(e);
return;
}
stopWatch.Restart();
// Make sure it's our instance of openSharpGL that's active.
renderContext.MakeCurrent();
if (this.designMode)
{
// 天蓝色背景
OpenGL.ClearColor(0x87 / 255.0f, 0xce / 255.0f, 0xeb / 255.0f, 0xff / 255.0f);
GLCanvasHelper.ResizeGL(this.Width, this.Height);
GLCanvasHelper.DrawPyramid();
}
else
{
// If there is a draw handler, then call it.
DoOpenGLDraw(e);
}
// Blit our offscreen bitmap.
Graphics graphics = e.Graphics;
IntPtr deviceContext = graphics.GetHdc();
renderContext.Blit(deviceContext);
graphics.ReleaseHdc(deviceContext);
stopWatch.Stop();
this.FPS = 1000.0 / stopWatch.Elapsed.TotalMilliseconds;
}
/// <summary>
///
/// </summary>
protected virtual void DesignModeRender()
{
// Sky blue fore background.
//OpenGL.ClearColor(0x87 / 255.0f, 0xce / 255.0f, 0xeb / 255.0f, 0xff / 255.0f);
OpenGL.ClearColor(0, 0, 0, 0);
// Clear the color and depth buffer.
OpenGL.Clear(OpenGL.GL_COLOR_BUFFER_BIT | OpenGL.GL_DEPTH_BUFFER_BIT | OpenGL.GL_STENCIL_BUFFER_BIT);
GLCanvasHelper.DrawClock();
OpenGL.DrawText(10,
10, Color.White, "Courier New",// "Courier New",
25.0f, this.GetType().FullName);
if (this.RenderTrigger == RenderTrigger.TimerBased)
{
OpenGL.DrawText(10,
this.Height - 20 - 1, Color.Red, "Courier New",// "Courier New",
20.0f, string.Format("FPS: {0}", this.FPS.ToShortString()));
}
}
private void CreateRenderContext()
{
// Initialises OpenGL.
var renderContext = new FBORenderContext();
// Create the render context.
renderContext.Create(OpenGLVersion, Width, Height, 32, null);
this.renderContext = renderContext;
renderContext.MakeCurrent();
// Set the most basic OpenGL styles.
OpenGL.ShadeModel(OpenGL.GL_SMOOTH);
// 天蓝色背景
OpenGL.ClearColor(0x87 / 255.0f, 0xce / 255.0f, 0xeb / 255.0f, 0xff / 255.0f);
OpenGL.ClearDepth(1.0f);
OpenGL.Enable(OpenGL.GL_DEPTH_TEST);
OpenGL.DepthFunc(OpenGL.GL_LEQUAL);
OpenGL.Hint(OpenGL.GL_PERSPECTIVE_CORRECTION_HINT, OpenGL.GL_NICEST);
}
private List <IColorCodedPicking> Render4Picking(RenderEventArgs arg)
{
// record clear color
var originalClearColor = new float[4];
OpenGL.GetFloat(GetTarget.ColorClearValue, originalClearColor);
// white color means nothing picked.
OpenGL.ClearColor(1.0f, 1.0f, 1.0f, 1.0f);
OpenGL.Clear(OpenGL.GL_COLOR_BUFFER_BIT | OpenGL.GL_DEPTH_BUFFER_BIT | OpenGL.GL_STENCIL_BUFFER_BIT);
// restore clear color
OpenGL.ClearColor(originalClearColor[0], originalClearColor[1], originalClearColor[2], originalClearColor[3]);
uint renderedVertexCount = 0;
var pickedRendererList = new List <IColorCodedPicking>();
RenderPickableObject(this.rootObject, arg, ref renderedVertexCount, pickedRendererList);
OpenGL.Flush();
return(pickedRendererList);
}
/// <summary>
/// 在此Buffer中的图元进行N选1
/// select a line from triangle/quad/polygon in this renderer.
/// </summary>
/// <param name="arg"></param>
/// <param name="indexBufferPtr">indicates the primitive to pick a line from.</param>
internal void Render4InnerPicking(RenderEventArgs arg, IndexBufferPtr indexBufferPtr)
{
// record clear color
var originalClearColor = new float[4];
OpenGL.GetFloat(GetTarget.ColorClearValue, originalClearColor);
// 白色意味着没有拾取到任何对象
// white color: nothing picked.
OpenGL.ClearColor(1.0f, 1.0f, 1.0f, 1.0f);
OpenGL.Clear(OpenGL.GL_COLOR_BUFFER_BIT | OpenGL.GL_DEPTH_BUFFER_BIT | OpenGL.GL_STENCIL_BUFFER_BIT);
// restore clear color
OpenGL.ClearColor(originalClearColor[0], originalClearColor[1], originalClearColor[2], originalClearColor[3]);
this.ColorCodedRender(arg, indexBufferPtr);
OpenGL.Flush();
//var filename = string.Format("Render4InnerPicking{0:yyyy-MM-dd_HH-mm-ss.ff}.png", DateTime.Now);
//Save2PictureHelper.Save2Picture(0, 0,
// e.CanvasRect.Width, e.CanvasRect.Height, filename);
}
/// <summary>
///
/// </summary>
protected override void SwitchOff()
{
OpenGL.ClearColor(original[0], original[1], original[2], original[3]);
}