From d451fcd7a7dbf1b0fe76892c3c584d4f3fbd964f Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Thu, 15 Feb 2024 16:39:13 -0800
Subject: [PATCH] Fixed HDR video content being too bright on Apple platforms

This probably isn't the exact formula that we need, but it's much closer to correct.
---
 test/testffmpeg.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/test/testffmpeg.c b/test/testffmpeg.c
index 448123972..d1b8e0901 100644
--- a/test/testffmpeg.c
+++ b/test/testffmpeg.c
@@ -800,6 +800,9 @@ static SDL_bool GetTextureForVideoToolboxFrame(AVFrame *frame, SDL_Texture **tex
             video_white_level = DEFAULT_HDR_WHITE_LEVEL;
         }
         SDL_SetRenderColorScale(renderer, SDR_white_level / video_white_level);
+    } else if (HDR_display) {
+        /* Apple platforms already scale up the brightness of content so we need to scale it down by the same amount for HDR video */
+        SDL_SetRenderColorScale(renderer, SDR_white_level / DEFAULT_SDR_WHITE_LEVEL);
     } else {
         SDL_SetRenderColorScale(renderer, 1.0f);
     }