report memory usage for textures

OpenRA.FileFormats/Graphics/IGraphicsDevice.cs

@@ -36,6 +36,7 @@ namespace OpenRA.FileFormats.Graphics
 		IShader CreateShader( string name );
 
 		Size WindowSize { get; }
+		int GpuMemoryUsed { get; }
 
 		void Clear( Color color );
 		void Present( IInputHandler inputHandler );

OpenRA.Renderer.Cg/GraphicsDevice.cs

@@ -318,5 +318,8 @@ namespace OpenRA.Renderer.Cg
 		public ITexture CreateTexture() { return new Texture( this ); }
 		public ITexture CreateTexture( Bitmap bitmap ) { return new Texture( this, bitmap ); }
 		public IShader CreateShader( string name ) { return new Shader( this, name ); }
+
+
+		public int GpuMemoryUsed { get { return 0; } }
 	}
 }

OpenRA.Renderer.Gl/GraphicsDevice.cs

@@ -311,5 +311,7 @@ namespace OpenRA.Renderer.Glsl
 		public ITexture CreateTexture() { return new Texture( this ); }
 		public ITexture CreateTexture( Bitmap bitmap ) { return new Texture( this, bitmap ); }
 		public IShader CreateShader( string name ) { return new Shader( this, name ); }
+
+		public int GpuMemoryUsed { get; internal set; }
 	}
 }

OpenRA.Renderer.Gl/Texture.cs

@@ -20,15 +20,21 @@ namespace OpenRA.Renderer.Glsl
 	public class Texture : ITexture
 	{
 		internal int texture;
+		internal int memory;
+		GraphicsDevice dev;
 		
 		public Texture(GraphicsDevice dev)
 		{
+			this.dev = dev;
+
 			Gl.glGenTextures(1, out texture);
 			GraphicsDevice.CheckGlError();
 		}
 		
 		public Texture(GraphicsDevice dev, Bitmap bitmap)
 		{
+			this.dev = dev;
+
 			Gl.glGenTextures(1, out texture);
 			GraphicsDevice.CheckGlError();
 			SetData(bitmap);
@@ -50,6 +56,18 @@ namespace OpenRA.Renderer.Glsl
 			GraphicsDevice.CheckGlError();
 		}
 
+		void UpdateMemoryUsage( int newSize )
+		{
+			if (newSize == memory)
+				return;
+
+			dev.GpuMemoryUsed -= memory;
+			memory = newSize;
+			dev.GpuMemoryUsed += memory;
+
+			Log.Write("debug", "GPU Memory: {0:F2} MiB", dev.GpuMemoryUsed / 1024 / 1024f);
+		}
+		
 		public void SetData(byte[] colors, int width, int height)
 		{
 			if (!IsPowerOf2(width) || !IsPowerOf2(height))
@@ -66,6 +84,8 @@ namespace OpenRA.Renderer.Glsl
 					GraphicsDevice.CheckGlError();
 				}
 			}
+
+			UpdateMemoryUsage(colors.Length);
 		}
 
 		// An array of RGBA
@@ -88,6 +108,8 @@ namespace OpenRA.Renderer.Glsl
 					GraphicsDevice.CheckGlError();
 				}
 			}
+
+			UpdateMemoryUsage(width * height * sizeof(uint));
 		}
 		
 		public void SetData(Bitmap bitmap)
@@ -108,6 +130,8 @@ namespace OpenRA.Renderer.Glsl
 				0, Gl.GL_BGRA, Gl.GL_UNSIGNED_BYTE, bits.Scan0);        // todo: weird strides
 			GraphicsDevice.CheckGlError();
 			bitmap.UnlockBits(bits);
+
+			UpdateMemoryUsage(bitmap.Width * bitmap.Height * sizeof(uint));
 		}
 
 		bool IsPowerOf2(int v)

OpenRA.Renderer.Null/NullGraphicsDevice.cs

@@ -47,6 +47,8 @@ namespace OpenRA.Renderer.Null
 		public ITexture CreateTexture() { return new NullTexture(); }
 		public ITexture CreateTexture(Bitmap bitmap) { return new NullTexture(); }
 		public IShader CreateShader(string name) { return new NullShader(); }
+
+		public int GpuMemoryUsed { get { return 0; } }
 	}
 	
 	public class NullIndexBuffer : IIndexBuffer