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Added new TextRendering sample.

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the_fiddler 2011-01-18 11:15:49 +00:00
parent 3d5cc0e39a
commit 263f33ca5b
3 changed files with 290 additions and 1 deletions
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287
Source/Examples/OpenGL/1.x/TextRendering.cs Normal file
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#region License
//
// The Open Toolkit Library License
//
// Copyright (c) 2006 - 2011 the Open Toolkit library.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do
// so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
//
#endregion
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Text;
using OpenTK;
using OpenTK.Graphics;
using OpenTK.Graphics.OpenGL;
namespace Examples.Tutorial
{
[Example("Text Rendering (2D)", ExampleCategory.OpenGL, "1.x", Documentation = "TextRendering")]
class TextRendering : GameWindow
{
TextRenderer renderer;
Font serif = new Font(FontFamily.GenericSerif, 24);
Font sans = new Font(FontFamily.GenericSansSerif, 24);
Font mono = new Font(FontFamily.GenericMonospace, 24);
/// <summary>
/// Uses System.Drawing for 2d text rendering.
/// </summary>
public class TextRenderer : IDisposable
{
Bitmap bmp;
Graphics gfx;
int texture;
Rectangle dirty_region;
bool disposed;
#region Constructors
/// <summary>
/// Constructs a new instance.
/// </summary>
/// <param name="width">The width of the backing store in pixels.</param>
/// <param name="height">The height of the backing store in pixels.</param>
public TextRenderer(int width, int height)
{
if (width <= 0)
throw new ArgumentOutOfRangeException("width");
if (height <= 0)
throw new ArgumentOutOfRangeException("height ");
if (GraphicsContext.CurrentContext == null)
throw new InvalidOperationException("No GraphicsContext is current on the calling thread.");
bmp = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
gfx = Graphics.FromImage(bmp);
gfx.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
texture = GL.GenTexture();
GL.BindTexture(TextureTarget.Texture2D, texture);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, width, height, 0,
PixelFormat.Rgba, PixelType.UnsignedByte, IntPtr.Zero);
}
#endregion
#region Public Members
/// <summary>
/// Clears the backing store to the specified color.
/// </summary>
/// <param name="color">A <see cref="System.Drawing.Color"/>.</param>
public void Clear(Color color)
{
gfx.Clear(color);
dirty_region = new Rectangle(0, 0, bmp.Width, bmp.Height);
}
/// <summary>
/// Draws the specified string to the backing store.
/// </summary>
/// <param name="text">The <see cref="System.String"/> to draw.</param>
/// <param name="font">The <see cref="System.Drawing.Font"/> that will be used.</param>
/// <param name="brush">The <see cref="System.Drawing.Brush"/> that will be used.</param>
/// <param name="point">The location of the text on the backing store, in 2d pixel coordinates.
/// The origin (0, 0) lies at the top-left corner of the backing store.</param>
public void DrawString(string text, Font font, Brush brush, PointF point)
{
gfx.DrawString(text, font, brush, point);
SizeF size = gfx.MeasureString(text, font);
dirty_region = Rectangle.Round(RectangleF.Union(dirty_region, new RectangleF(point, size)));
dirty_region = Rectangle.Intersect(dirty_region, new Rectangle(0, 0, bmp.Width, bmp.Height));
}
/// <summary>
/// Gets a <see cref="System.Int32"/> that represents an OpenGL 2d texture handle.
/// The texture contains a copy of the backing store. Bind this texture to TextureTarget.Texture2d
/// in order to render the drawn text on screen.
/// </summary>
public int Texture
{
get
{
UploadBitmap();
return texture;
}
}
#endregion
#region Private Members
// Uploads the dirty regions of the backing store to the OpenGL texture.
void UploadBitmap()
{
if (dirty_region != RectangleF.Empty)
{
System.Drawing.Imaging.BitmapData data = bmp.LockBits(dirty_region,
System.Drawing.Imaging.ImageLockMode.ReadOnly,
System.Drawing.Imaging.PixelFormat.Format32bppArgb);
GL.BindTexture(TextureTarget.Texture2D, texture);
GL.TexSubImage2D(TextureTarget.Texture2D, 0,
dirty_region.X, dirty_region.Y, dirty_region.Width, dirty_region.Height,
PixelFormat.Bgra, PixelType.UnsignedByte, data.Scan0);
bmp.UnlockBits(data);
dirty_region = Rectangle.Empty;
}
}
#endregion
#region IDisposable Members
void Dispose(bool manual)
{
if (!disposed)
{
if (manual)
{
bmp.Dispose();
gfx.Dispose();
if (GraphicsContext.CurrentContext != null)
GL.DeleteTexture(texture);
}
disposed = true;
}
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
~TextRenderer()
{
Console.WriteLine("[Warning] Resource leaked: {0}.", typeof(TextRenderer));
}
#endregion
}
#region Constructor
public TextRendering()
: base(800, 600)
{
}
#endregion
#region OnLoad
protected override void OnLoad(EventArgs e)
{
renderer = new TextRenderer(Width, Height);
PointF position = PointF.Empty;
renderer.Clear(Color.MidnightBlue);
renderer.DrawString("The quick brown fox jumps over the lazy dog", serif, Brushes.White, position);
position.Y += serif.Height;
renderer.DrawString("The quick brown fox jumps over the lazy dog", sans, Brushes.White, position);
position.Y += sans.Height;
renderer.DrawString("The quick brown fox jumps over the lazy dog", mono, Brushes.White, position);
position.Y += mono.Height;
}
#endregion
#region OnUnload
protected override void OnUnload(EventArgs e)
{
renderer.Dispose();
}
#endregion
#region OnResize
protected override void OnResize(EventArgs e)
{
GL.Viewport(ClientRectangle);
GL.MatrixMode(MatrixMode.Projection);
GL.LoadIdentity();
GL.Ortho(-1.0, 1.0, -1.0, 1.0, 0.0, 4.0);
}
#endregion
#region OnUpdateFrame
protected override void OnUpdateFrame(FrameEventArgs e)
{
if (Keyboard[OpenTK.Input.Key.Escape])
{
this.Exit();
}
}
#endregion
#region OnRenderFrame
protected override void OnRenderFrame(FrameEventArgs e)
{
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
GL.MatrixMode(MatrixMode.Modelview);
GL.LoadIdentity();
GL.Enable(EnableCap.Texture2D);
GL.BindTexture(TextureTarget.Texture2D, renderer.Texture);
GL.Begin(BeginMode.Quads);
GL.TexCoord2(0.0f, 1.0f); GL.Vertex2(-1f, -1f);
GL.TexCoord2(1.0f, 1.0f); GL.Vertex2(1f, -1f);
GL.TexCoord2(1.0f, 0.0f); GL.Vertex2(1f, 1f);
GL.TexCoord2(0.0f, 0.0f); GL.Vertex2(-1f, 1f);
GL.End();
SwapBuffers();
}
#endregion
#region Main
public static void Main()
{
using (TextRendering example = new TextRendering())
{
Utilities.SetWindowTitle(example);
example.Run(30.0);
}
}
#endregion
}
}

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Source/Examples/OpenGL/1.x/TextRendering.rtf Normal file
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4
Source/Examples/OpenTK.Examples.csproj
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<?xml version="1.0" encoding="utf-8"?> <?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="4.0"> <Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="4.0">
<PropertyGroup> <PropertyGroup>
<ProjectType>Local</ProjectType> <ProjectType>Local</ProjectType>
@ -151,6 +151,7 @@
<Compile Include="OpenGL\1.x\OpenGLDiagnostics.cs"> <Compile Include="OpenGL\1.x\OpenGLDiagnostics.cs">
<SubType>Code</SubType> <SubType>Code</SubType>
</Compile> </Compile>
<Compile Include="OpenGL\1.x\TextRendering.cs" />
<Compile Include="SamplesTreeViewSorter.cs"> <Compile Include="SamplesTreeViewSorter.cs">
<SubType>Code</SubType> <SubType>Code</SubType>
</Compile> </Compile>
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</None> </None>
<EmbeddedResource Include="OpenGL\1.x\OpenGLDiagnostics.rtf" /> <EmbeddedResource Include="OpenGL\1.x\OpenGLDiagnostics.rtf" />
<EmbeddedResource Include="OpenGL\1.x\Anaglyph.rtf" /> <EmbeddedResource Include="OpenGL\1.x\Anaglyph.rtf" />
<EmbeddedResource Include="OpenGL\1.x\TextRendering.rtf" />
<None Include="Resources\App.ico"> <None Include="Resources\App.ico">
</None> </None>
<None Include="..\OpenTK\OpenTK.dll.config"> <None Include="..\OpenTK\OpenTK.dll.config">