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Changed FBO example and documentation to be more useful.

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This commit is contained in:
chrisbrandtner 2010-10-28 15:58:10 +00:00
parent de7d38d446
commit a2d53705e7
2 changed files with 26 additions and 36 deletions
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60
Source/Examples/OpenGL/1.x/FramebufferObject.cs
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@ -21,7 +21,7 @@ namespace Examples.Tutorial
public class SimpleFBO : GameWindow
{
public SimpleFBO()
: base(800, 600)
: base(800, 400)
{
}
@ -33,24 +33,7 @@ namespace Examples.Tutorial
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
Examples.Shapes.DrawableShape Object;
protected override void OnLoad(EventArgs e)
{
@ -63,12 +46,13 @@ namespace Examples.Tutorial
Exit();
}
Object = new Shapes.TorusKnot(256, 16, 0.2, 7,8, 1, true);
GL.Enable(EnableCap.DepthTest);
GL.ClearDepth(1.0f);
GL.DepthFunc(DepthFunction.Lequal);
GL.Disable(EnableCap.CullFace);
GL.PolygonMode(MaterialFace.Back, PolygonMode.Line);
GL.Enable(EnableCap.CullFace);
// Create Color Tex
GL.GenTextures(1, out ColorTexture);
@ -176,20 +160,24 @@ namespace Examples.Tutorial
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();
OpenTK.Matrix4 perspective = OpenTK.Matrix4.CreatePerspectiveFieldOfView( MathHelper.PiOver4, TextureSize / (float)TextureSize, 2.5f, 6f );
GL.MatrixMode( MatrixMode.Projection );
GL.LoadMatrix( ref perspective );
Matrix4 lookat = Matrix4.LookAt( 0f, 0f, 4.5f, 0f, 0f, 0f, 0f, 1f, 0f );
GL.MatrixMode( MatrixMode.Modelview );
GL.LoadMatrix( ref lookat );
// draw some complex object into the FBO's textures
GL.Enable( EnableCap.Lighting );
GL.Enable( EnableCap.Light0 );
GL.Enable( EnableCap.ColorMaterial );
GL.Color3( 0f, 1f, 0f );
Object.Draw();
GL.Disable( EnableCap.ColorMaterial );
GL.Disable( EnableCap.Light0 );
GL.Disable( EnableCap.Lighting );
}
GL.PopAttrib();
GL.Ext.BindFramebuffer(FramebufferTarget.FramebufferExt, 0); // disable rendering into the FBO
@ -203,6 +191,8 @@ namespace Examples.Tutorial
protected override void OnUnload(EventArgs e)
{
Object.Dispose();
// Clean up what we allocated before exiting
if (ColorTexture != 0)
GL.DeleteTextures(1, ref ColorTexture);

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Source/Examples/OpenGL/1.x/FramebufferObject.rtf
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