ryujinx-backup/Opentk
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Added Inertia's FrameBufferObject example.

Browse source
This commit is contained in:
the_fiddler 2008-05-05 17:05:11 +00:00
parent 35aad19554
commit a8eee8da11
1 changed files with 298 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

298
Source/Examples/OpenGL/FrameBufferObject.cs Normal file
View file

@ -0,0 +1,298 @@
#region --- License ---
/* Licensed under the MIT/X11 license.
* Copyright (c) 2006-2008 the OpenTK Team.
* This notice may not be removed from any source distribution.
* See license.txt for licensing details.
*/
#endregion
using System;
using System.Diagnostics;
using OpenTK;
using OpenTK.Input;
using OpenTK.Math;
using OpenTK.Graphics;
using OpenTK.Graphics.OpenGL;
namespace Examples.Tutorial
{
[Example("Simple FrameBuffer Object.", ExampleCategory.OpenGL)]
public class SimpleFBO : GameWindow
{
public SimpleFBO()
: base(800, 600)
{
}
TextureFont sans = new TextureFont(new System.Drawing.Font(System.Drawing.FontFamily.GenericSansSerif, 14.0f));
ITextPrinter text = new TextPrinter();
uint ColorTexture;
uint DepthTexture;
uint FBOHandle;
const int TextureSize = 512;
#region Randoms
Random rnd = new Random();
public const float scale = 3f;
/// <summary>Returns a random Float in the range [-0.5*scale..+0.5*scale]</summary>
public float GetRandom()
{
return (float)(rnd.NextDouble() - 0.5) * scale;
}
/// <summary>Returns a random Float in the range [0..1]</summary>
public float GetRandom0to1()
{
return (float)rnd.NextDouble();
}
#endregion Randoms
public override void OnLoad(EventArgs e)
{
GL.Enable(EnableCap.DepthTest);
GL.ClearDepth(1.0f);
GL.DepthFunc(DepthFunction.Lequal);
GL.Disable(EnableCap.CullFace);
GL.PolygonMode(MaterialFace.Back, PolygonMode.Line);
// Create Color Tex
GL.GenTextures(1, out ColorTexture);
GL.BindTexture(TextureTarget.Texture2D, ColorTexture);
GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba8, TextureSize, TextureSize, 0, PixelFormat.Rgba, PixelType.UnsignedByte, IntPtr.Zero);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.ClampToBorder);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.ClampToBorder);
// GL.Ext.GenerateMipmap( GenerateMipmapTarget.Texture2D );
// Create Depth Tex
GL.GenTextures(1, out DepthTexture);
GL.BindTexture(TextureTarget.Texture2D, DepthTexture);
GL.TexImage2D(TextureTarget.Texture2D, 0, (PixelInternalFormat)All.DepthComponent32, TextureSize, TextureSize, 0, PixelFormat.DepthComponent, PixelType.UnsignedInt, IntPtr.Zero);
// things go horribly wrong if DepthComponent's Bitcount does not match the main Framebuffer's Depth
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.ClampToBorder);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.ClampToBorder);
// GL.Ext.GenerateMipmap( GenerateMipmapTarget.Texture2D );
// Create a FBO and attach the textures
GL.Ext.GenFramebuffers(1, out FBOHandle);
GL.Ext.BindFramebuffer(FramebufferTarget.FramebufferExt, FBOHandle);
GL.Ext.FramebufferTexture2D(FramebufferTarget.FramebufferExt, FramebufferAttachment.ColorAttachment0Ext, TextureTarget.Texture2D, ColorTexture, 0);
GL.Ext.FramebufferTexture2D(FramebufferTarget.FramebufferExt, FramebufferAttachment.DepthAttachmentExt, TextureTarget.Texture2D, DepthTexture, 0);
#region Test for Error
switch (GL.Ext.CheckFramebufferStatus(FramebufferTarget.FramebufferExt))
{
case FramebufferErrorCode.FramebufferCompleteExt:
{
Console.WriteLine("FBO: The framebuffer is complete and valid for rendering.");
break;
}
case FramebufferErrorCode.FramebufferIncompleteAttachmentExt:
{
Console.WriteLine("FBO: One or more attachment points are not framebuffer attachment complete. This could mean there’s no texture attached or the format isn’t renderable. For color textures this means the base format must be RGB or RGBA and for depth textures it must be a DEPTH_COMPONENT format. Other causes of this error are that the width or height is zero or the z-offset is out of range in case of render to volume.");
break;
}
case FramebufferErrorCode.FramebufferIncompleteMissingAttachmentExt:
{
Console.WriteLine("FBO: There are no attachments.");
break;
}
/* case FramebufferErrorCode.GL_FRAMEBUFFER_INCOMPLETE_DUPLICATE_ATTACHMENT_EXT:
{
Console.WriteLine("FBO: An object has been attached to more than one attachment point.");
break;
}*/
case FramebufferErrorCode.FramebufferIncompleteDimensionsExt:
{
Console.WriteLine("FBO: Attachments are of different size. All attachments must have the same width and height.");
break;
}
case FramebufferErrorCode.FramebufferIncompleteFormatsExt:
{
Console.WriteLine("FBO: The color attachments have different format. All color attachments must have the same format.");
break;
}
case FramebufferErrorCode.FramebufferIncompleteDrawBufferExt:
{
Console.WriteLine("FBO: An attachment point referenced by GL.DrawBuffers() doesn’t have an attachment.");
break;
}
case FramebufferErrorCode.FramebufferIncompleteReadBufferExt:
{
Console.WriteLine("FBO: The attachment point referenced by GL.ReadBuffers() doesn’t have an attachment.");
break;
}
case FramebufferErrorCode.FramebufferUnsupportedExt:
{
Console.WriteLine("FBO: This particular FBO configuration is not supported by the implementation.");
break;
}
default:
{
Console.WriteLine("FBO: Status unknown. (yes, this is really bad.)");
break;
}
}
// using FBO might have changed states, e.g. the FBO might not support stereoscopic views or double buffering
int[] queryinfo = new int[6];
GL.GetInteger(GetPName.MaxColorAttachmentsExt, out queryinfo[0]);
GL.GetInteger(GetPName.AuxBuffers, out queryinfo[1]);
GL.GetInteger(GetPName.MaxDrawBuffers, out queryinfo[2]);
GL.GetInteger(GetPName.Stereo, out queryinfo[3]);
GL.GetInteger(GetPName.Samples, out queryinfo[4]);
GL.GetInteger(GetPName.Doublebuffer, out queryinfo[5]);
Console.WriteLine("max. ColorBuffers: " + queryinfo[0] + " max. AuxBuffers: " + queryinfo[1] + " max. DrawBuffers: " + queryinfo[2] +
"\nStereo: " + queryinfo[3] + " Samples: " + queryinfo[4] + " DoubleBuffer: " + queryinfo[5]);
Console.WriteLine("Last GL Error: " + GL.GetError());
#endregion Test for Error
GL.PushAttrib(AttribMask.ViewportBit);
{
GL.Viewport(0, 0, TextureSize, TextureSize);
// clear the screen in red, to make it very obvious what the clear affected. only the FBO, not the real framebuffer
GL.ClearColor(1f, 0f, 0f, 0f);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
// smack 50 random triangles into the FBO's textures
GL.Begin(BeginMode.Triangles);
{
for (int i = 0; i < 50; i++)
{
GL.Color3(GetRandom0to1(), GetRandom0to1(), GetRandom0to1());
GL.Vertex3(GetRandom(), GetRandom(), GetRandom());
GL.Color3(GetRandom0to1(), GetRandom0to1(), GetRandom0to1());
GL.Vertex3(GetRandom(), GetRandom(), GetRandom());
GL.Color3(GetRandom0to1(), GetRandom0to1(), GetRandom0to1());
GL.Vertex3(GetRandom(), GetRandom(), GetRandom());
}
}
GL.End();
}
GL.PopAttrib();
GL.Ext.BindFramebuffer(FramebufferTarget.FramebufferExt, 0); // disable rendering into the FBO
GL.ClearColor(.1f, .2f, .3f, 0f);
GL.Color3(1f, 1f, 1f);
GL.Enable(EnableCap.Texture2D); // enable Texture Mapping
GL.BindTexture(TextureTarget.Texture2D, 0); // bind default texture
}
public override void OnUnload(EventArgs e)
{
// Clean up what we allocated before exiting
GL.DeleteTextures(1, ref ColorTexture);
GL.DeleteTextures(1, ref DepthTexture);
GL.Ext.DeleteFramebuffers(1, ref FBOHandle);
base.OnUnload(e);
}
protected override void OnResize(OpenTK.Platform.ResizeEventArgs e)
{
GL.Viewport(0, 0, Width, Height);
GL.MatrixMode(MatrixMode.Projection);
GL.LoadIdentity();
Glu.Perspective(60.0, Width / (double)Height, 1.0, 5.0);
GL.MatrixMode(MatrixMode.Modelview);
GL.LoadIdentity();
Glu.LookAt(0.0, 0.0, 3.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
base.OnResize(e);
}
public override void OnUpdateFrame(UpdateFrameEventArgs e)
{
base.OnUpdateFrame(e);
if (Keyboard[Key.Space])
{
ErrorCode err = GL.GetError();
Console.WriteLine(err + " " + Glu.ErrorString((GluErrorCode)err));
}
if (Keyboard[Key.Escape])
this.Exit();
}
public override void OnRenderFrame(RenderFrameEventArgs e)
{
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
text.Begin();
text.Draw((1.0 / e.Time).ToString("F2"), sans);
text.End();
GL.PushMatrix();
{
// Draw the Color Texture
GL.Translate(-1.1f, 0f, 0f);
GL.BindTexture(TextureTarget.Texture2D, ColorTexture);
GL.Begin(BeginMode.Quads);
{
GL.TexCoord2(0f, 1f);
GL.Vertex2(-1.0f, 1.0f);
GL.TexCoord2(0.0f, 0.0f);
GL.Vertex2(-1.0f, -1.0f);
GL.TexCoord2(1.0f, 0.0f);
GL.Vertex2(1.0f, -1.0f);
GL.TexCoord2(1.0f, 1.0f);
GL.Vertex2(1.0f, 1.0f);
}
GL.End();
// Draw the Depth Texture
GL.Translate(+2.2f, 0f, 0f);
GL.BindTexture(TextureTarget.Texture2D, DepthTexture);
GL.Begin(BeginMode.Quads);
{
GL.TexCoord2(0f, 1f);
GL.Vertex2(-1.0f, 1.0f);
GL.TexCoord2(0.0f, 0.0f);
GL.Vertex2(-1.0f, -1.0f);
GL.TexCoord2(1.0f, 0.0f);
GL.Vertex2(1.0f, -1.0f);
GL.TexCoord2(1.0f, 1.0f);
GL.Vertex2(1.0f, 1.0f);
}
GL.End();
}
GL.PopMatrix();
this.SwapBuffers();
}
#region public static void Main()
/// <summary>
/// Entry point of this example.
/// </summary>
[STAThread]
public static void Main()
{
using (SimpleFBO example = new SimpleFBO())
{
Utilities.SetWindowTitle(example);
example.Run(30.0, 0.0);
}
}
#endregion
}
}