fixes a bug with MonoGame and FNA when creating a texture at runtime

fixes Mono not finding the dylib by prepending "lib"

src/ImGui.NET.SampleProgram.XNA/ImGui.NET.SampleProgram.XNA.csproj

@@ -15,7 +15,7 @@
 
  <ItemGroup>
  <Content Include="$(RepositoryRootDirectory)/deps/cimgui/win-x64/cimgui.dll" CopyToOutputDirectory="PreserveNewest" />
- <Content Include="$(RepositoryRootDirectory)/deps/cimgui/osx-x64/cimgui.dylib" CopyToOutputDirectory="PreserveNewest" />
+ <Content Include="$(RepositoryRootDirectory)/deps/cimgui/osx-x64/libcimgui.dylib" CopyToOutputDirectory="PreserveNewest" />
  <Content Include="$(RepositoryRootDirectory)/deps/cimgui/linux-x64/cimgui.so" CopyToOutputDirectory="PreserveNewest" />
  </ItemGroup>
 

src/ImGui.NET.SampleProgram.XNA/SampleGame.cs

@@ -37,13 +37,18 @@ protected override void Initialize()
 
  protected override void LoadContent()
  {
- // Texture loading example
+ // Texture loading example
 
- // First, load the texture as a Texture2D (can also be done using the XNA/FNA content pipeline)
- _xnaTexture = Texture2D.FromStream(GraphicsDevice, GenerateImage(300, 150));
+ // First, load the texture as a Texture2D (can also be done using the XNA/FNA content pipeline)
+ _xnaTexture = CreateTexture(GraphicsDevice, 300, 150, pixel =>
+ {
+ //Console.WriteLine( pixel );
+ var red = (pixel % 300) / 2;
+ return new Color(red, 1, 1);
+ });
 
- // Then, bind it to an ImGui-friendly pointer, that we can use during regular ImGui.** calls (see below)
- _imGuiTexture = _imGuiRenderer.BindTexture(_xnaTexture);
+ // Then, bind it to an ImGui-friendly pointer, that we can use during regular ImGui.** calls (see below)
+ _imGuiTexture = _imGuiRenderer.BindTexture(_xnaTexture);
 
  base.LoadContent();
  }
@@ -107,28 +112,23 @@ protected virtual void ImGuiLayout()
  }
  }
 
- private static Stream GenerateImage(int width, int height)
- {
- var stream = new MemoryStream();
- var random = new Random(42);
-
- var bmp = new System.Drawing.Bitmap(width, height);
- var graphics = System.Drawing.Graphics.FromImage(bmp);
- graphics.Clear(System.Drawing.Color.Black);
-
- for (int i = 0; i < 100; i++)
- {
- var size = random.Next(10, 50);
- var pen = new System.Drawing.Pen(System.Drawing.Color.FromArgb(random.Next(0, 255), random.Next(0, 255), random.Next(0, 255)), random.Next(1, 4));
-
- graphics.DrawEllipse(pen, random.Next(0, width), random.Next(0, height), size, size);
- }
-
- bmp.Save(stream, System.Drawing.Imaging.ImageFormat.Bmp);
-
- stream.Position = 0;
-
- return stream;
- }
- }
+ public static Texture2D CreateTexture(GraphicsDevice device, int width, int height, Func<int, Color> paint)
+ {
+ //initialize a texture
+ var texture = new Texture2D(device, width, height);
+
+ //the array holds the color for each pixel in the texture
+ Color[] data = new Color[width * height];
+ for(var pixel = 0; pixel < data.Length; pixel++)
+ {
+ //the function applies the color according to the specified pixel
+ data[pixel] = paint( pixel );
+ }
+
+ //set the color
+ texture.SetData( data );
+
+ return texture;
+ }
+ }
 }