From 2215f749597f15c23bb802d3bd6f19a1e7e30460 Mon Sep 17 00:00:00 2001
From: Paul Chote <paul@chote.net>
Date: Thu, 13 Jun 2013 05:07:47 +1200
Subject: [PATCH] Support rendering sprites into non-rectangular quads.

---
 OpenRA.Game/Graphics/SpriteRenderer.cs | 15 +++++++++++++++
 OpenRA.Game/Graphics/Util.cs           | 20 ++++++++++++--------
 2 files changed, 27 insertions(+), 8 deletions(-)

diff --git a/OpenRA.Game/Graphics/SpriteRenderer.cs b/OpenRA.Game/Graphics/SpriteRenderer.cs
index 465db7ce75..14049bb4af 100644
--- a/OpenRA.Game/Graphics/SpriteRenderer.cs
+++ b/OpenRA.Game/Graphics/SpriteRenderer.cs
@@ -81,6 +81,21 @@ namespace OpenRA.Graphics
 			DrawSprite(s, location, 0, size);
 		}
 
+		public void DrawSprite(Sprite s, float2 a, float2 b, float2 c, float2 d)
+		{
+			Renderer.CurrentBatchRenderer = this;
+
+			if (s.sheet != currentSheet)
+				Flush();
+
+			if (nv + 4 > Renderer.TempBufferSize)
+				Flush();
+
+			currentSheet = s.sheet;
+			Util.FastCreateQuad(vertices, a, b, c, d, s, 0, nv);
+			nv += 4;
+		}
+
 		public void DrawVertexBuffer(IVertexBuffer<Vertex> buffer, int start, int length, PrimitiveType type, Sheet sheet)
 		{
 			shader.SetTexture("DiffuseTexture", sheet.Texture);
diff --git a/OpenRA.Game/Graphics/Util.cs b/OpenRA.Game/Graphics/Util.cs
index 98673f2486..c859121b9d 100644
--- a/OpenRA.Game/Graphics/Util.cs
+++ b/OpenRA.Game/Graphics/Util.cs
@@ -18,17 +18,21 @@ namespace OpenRA.Graphics
 		static float[] channelSelect = { 0.75f, 0.25f, -0.25f, -0.75f };
 
 		public static void FastCreateQuad(Vertex[] vertices, float2 o, Sprite r, int palette, int nv, float2 size)
+		{
+			var b = new float2(o.X + size.X, o.Y);
+			var c = new float2(o.X + size.X, o.Y + size.Y);
+			var d = new float2(o.X, o.Y + size.Y);
+			FastCreateQuad(vertices, o, b, c, d, r, palette, nv);
+		}
+
+		public static void FastCreateQuad(Vertex[] vertices, float2 a, float2 b, float2 c, float2 d, Sprite r, int palette, int nv)
 		{
 			var attrib = new float2(palette / (float)HardwarePalette.MaxPalettes, channelSelect[(int)r.channel]);
 
-			vertices[nv] = new Vertex(o,
-				r.FastMapTextureCoords(0), attrib);
-			vertices[nv + 1] = new Vertex(new float2(o.X + size.X, o.Y),
-				r.FastMapTextureCoords(1), attrib);
-			vertices[nv + 2] = new Vertex(new float2(o.X + size.X, o.Y + size.Y),
-				r.FastMapTextureCoords(3), attrib);
-			vertices[nv + 3] = new Vertex(new float2(o.X, o.Y + size.Y),
-				r.FastMapTextureCoords(2), attrib);
+			vertices[nv] = new Vertex(a, r.FastMapTextureCoords(0), attrib);
+			vertices[nv + 1] = new Vertex(b, r.FastMapTextureCoords(1), attrib);
+			vertices[nv + 2] = new Vertex(c, r.FastMapTextureCoords(3), attrib);
+			vertices[nv + 3] = new Vertex(d, r.FastMapTextureCoords(2), attrib);
 		}
 
 		static readonly int[] channelMasks = { 2, 1, 0, 3 };	// yes, our channel order is nuts.