From 4a8012091ba5cb9f0671d818813f21f4511cde8f Mon Sep 17 00:00:00 2001
From: Michael Martin <mcmartin@gmail.com>
Date: Sun, 29 Sep 2019 00:27:22 -0700
Subject: [PATCH] Implement scanlines for SDL2

---
 sc2/src/libs/graphics/sdl/sdl2_pure.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/sc2/src/libs/graphics/sdl/sdl2_pure.c b/sc2/src/libs/graphics/sdl/sdl2_pure.c
index 4039fa295..d14ca5bd2 100644
--- a/sc2/src/libs/graphics/sdl/sdl2_pure.c
+++ b/sc2/src/libs/graphics/sdl/sdl2_pure.c
@@ -306,7 +306,15 @@ TFB_SDL2_UpdateTexture (SDL_Texture *dest, SDL_Surface *src, SDL_Rect *rect)
 static void
 TFB_SDL2_ScanLines (void)
 {
-	/* TODO */
+	int y;
+	SDL_SetRenderDrawColor (renderer, 0, 0, 0, 64);
+	SDL_SetRenderDrawBlendMode (renderer, SDL_BLENDMODE_BLEND);
+	SDL_RenderSetLogicalSize (renderer, ScreenWidth * 2, ScreenHeight * 2);
+	for (y = 0; y < ScreenHeight * 2; y += 2)
+	{
+		SDL_RenderDrawLine (renderer, 0, y, ScreenWidth * 2 - 1, y);
+	}
+	SDL_RenderSetLogicalSize (renderer, ScreenWidth, ScreenHeight);
 }
 
 static void