From 80172ee93214969cf446ceac5d66e1fb5f56b068 Mon Sep 17 00:00:00 2001
From: Hannu Hanhi <hhanhipublic@gmail.com>
Date: Thu, 23 Jul 2020 18:24:41 +0300
Subject: [PATCH] Don't discard zero alpha fog block fragments. Fixes #198.

---
 src/hardware/r_opengl/r_opengl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/hardware/r_opengl/r_opengl.c b/src/hardware/r_opengl/r_opengl.c
index 08d688e1d..2603abd46 100644
--- a/src/hardware/r_opengl/r_opengl.c
+++ b/src/hardware/r_opengl/r_opengl.c
@@ -1535,7 +1535,7 @@ EXPORT void HWRAPI(SetBlend) (FBITFIELD PolyFlags)
 					// Sryder: Fog
 					// multiplies input colour by input alpha, and destination colour by input colour, then adds them
 					pglBlendFunc(GL_SRC_ALPHA, GL_SRC_COLOR);
-					pglAlphaFunc(GL_NOTEQUAL, 0.0f);
+					pglAlphaFunc(GL_ALWAYS, 0.0f); // Don't discard zero alpha fragments
 					break;
 				default : // must be 0, otherwise it's an error
 					// No blending