Introduce RgbaColorRenderer class.

OpenRA.Game/Graphics/RgbaColorRenderer.cs

@@ -0,0 +1,129 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2015 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+
+namespace OpenRA.Graphics
+{
+	public class RgbaColorRenderer : Renderer.IBatchRenderer
+	{
+		static readonly float2 Offset = new float2(0.5f, 0.5f);
+
+		readonly Renderer renderer;
+		readonly IShader shader;
+		readonly Action renderAction;
+
+		readonly Vertex[] vertices;
+		int nv = 0;
+
+		public RgbaColorRenderer(Renderer renderer, IShader shader)
+		{
+			this.renderer = renderer;
+			this.shader = shader;
+			vertices = new Vertex[renderer.TempBufferSize];
+			renderAction = () => renderer.DrawBatch(vertices, nv, PrimitiveType.QuadList);
+		}
+
+		public void Flush()
+		{
+			if (nv > 0)
+			{
+				renderer.Device.SetBlendMode(BlendMode.Alpha);
+				shader.Render(renderAction);
+				renderer.Device.SetBlendMode(BlendMode.None);
+
+				nv = 0;
+			}
+		}
+
+		public void DrawLine(float2 start, float2 end, float width, Color color)
+		{
+			renderer.CurrentBatchRenderer = this;
+
+			if (nv + 4 > renderer.TempBufferSize)
+				Flush();
+
+			var delta = (end - start) / (end - start).Length;
+			var corner = width / 2 * new float2(-delta.Y, delta.X);
+
+			color = Util.PremultiplyAlpha(color);
+			var r = color.R / 255.0f;
+			var g = color.G / 255.0f;
+			var b = color.B / 255.0f;
+			var a = color.A / 255.0f;
+
+			vertices[nv++] = new Vertex(start - corner + Offset, r, g, b, a);
+			vertices[nv++] = new Vertex(start + corner + Offset, r, g, b, a);
+			vertices[nv++] = new Vertex(end + corner + Offset, r, g, b, a);
+			vertices[nv++] = new Vertex(end - corner + Offset, r, g, b, a);
+		}
+
+		public void FillRect(float2 tl, float2 br, Color color)
+		{
+			renderer.CurrentBatchRenderer = this;
+
+			if (nv + 4 > renderer.TempBufferSize)
+				Flush();
+
+			color = Util.PremultiplyAlpha(color);
+			var r = color.R / 255.0f;
+			var g = color.G / 255.0f;
+			var b = color.B / 255.0f;
+			var a = color.A / 255.0f;
+
+			vertices[nv++] = new Vertex(new float2(tl.X, tl.Y) + Offset, r, g, b, a);
+			vertices[nv++] = new Vertex(new float2(br.X, tl.Y) + Offset, r, g, b, a);
+			vertices[nv++] = new Vertex(new float2(br.X, br.Y) + Offset, r, g, b, a);
+			vertices[nv++] = new Vertex(new float2(tl.X, br.Y) + Offset, r, g, b, a);
+		}
+
+		public void FillRect(float2 a, float2 b, float2 c, float2 d, Color color)
+		{
+			renderer.CurrentBatchRenderer = this;
+
+			if (nv + 4 > renderer.TempBufferSize)
+				Flush();
+
+			color = Util.PremultiplyAlpha(color);
+			var cr = color.R / 255.0f;
+			var cg = color.G / 255.0f;
+			var cb = color.B / 255.0f;
+			var ca = color.A / 255.0f;
+
+			vertices[nv++] = new Vertex(a + Offset, cr, cg, cb, ca);
+			vertices[nv++] = new Vertex(b + Offset, cr, cg, cb, ca);
+			vertices[nv++] = new Vertex(c + Offset, cr, cg, cb, ca);
+			vertices[nv++] = new Vertex(d + Offset, cr, cg, cb, ca);
+		}
+
+		public void FillEllipse(RectangleF r, Color color, int vertices = 32)
+		{
+			// TODO: Create an ellipse polygon instead
+			var a = (r.Right - r.Left) / 2;
+			var b = (r.Bottom - r.Top) / 2;
+			var xc = (r.Right + r.Left) / 2;
+			var yc = (r.Bottom + r.Top) / 2;
+			for (var y = r.Top; y <= r.Bottom; y++)
+			{
+				var dx = a * (float)Math.Sqrt(1 - (y - yc) * (y - yc) / b / b);
+				DrawLine(new float2(xc - dx, y), new float2(xc + dx, y), 1, color);
+			}
+		}
+
+		public void SetViewportParams(Size screen, float zoom, int2 scroll)
+		{
+			shader.SetVec("Scroll", scroll.X, scroll.Y);
+			shader.SetVec("r1", zoom * 2f / screen.Width, -zoom * 2f / screen.Height);
+			shader.SetVec("r2", -1, 1);
+		}
+	}
+}