From c43ba5edd76705e8581841fe1e9a0546b0119675 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Sat, 12 Dec 2009 20:31:28 +0000
Subject: [PATCH] Fixed line drawing for D3D

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%404299
---
 src/video/win32/SDL_d3drender.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/video/win32/SDL_d3drender.c b/src/video/win32/SDL_d3drender.c
index a82f93cae..90baf9bd3 100644
--- a/src/video/win32/SDL_d3drender.c
+++ b/src/video/win32/SDL_d3drender.c
@@ -1012,8 +1012,17 @@ D3D_RenderLines(SDL_Renderer * renderer, const SDL_Point * points, int count)
         vertices[i].v = 0.0f;
     }
     result =
-        IDirect3DDevice9_DrawPrimitiveUP(data->device, D3DPT_LINESTRIP, count,
+        IDirect3DDevice9_DrawPrimitiveUP(data->device, D3DPT_LINESTRIP, count-1,
                                          vertices, sizeof(*vertices));
+
+    /* DirectX 9 has the same line rasterization semantics as GDI,
+       so we need to close the endpoint of the line */
+    if (points[0].x != points[count-1].x || points[0].y != points[count-1].y) {
+        vertices[0].x = (float) points[count-1].x;
+        vertices[0].y = (float) points[count-1].y;
+        result = IDirect3DDevice9_DrawPrimitiveUP(data->device, D3DPT_POINTLIST, 1, vertices, sizeof(*vertices));
+    }
+
     SDL_stack_free(vertices);
     if (FAILED(result)) {
         D3D_SetError("DrawPrimitiveUP()", result);