From 1bd74718ee83e6923ce11d3cac620b52f0a99610 Mon Sep 17 00:00:00 2001
From: alphanu1 <37101891+alphanu1@users.noreply.github.com>
Date: Tue, 8 May 2018 15:13:37 +0100
Subject: [PATCH] added swap_interval change for CRT

Change for interlaced resolution when CRT active
---
 gfx/video_driver.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/gfx/video_driver.c b/gfx/video_driver.c
index 1776954fef..91b0f7c6ff 100644
--- a/gfx/video_driver.c
+++ b/gfx/video_driver.c
@@ -1017,6 +1017,10 @@ static bool video_driver_init_internal(bool *video_is_threaded)
    video.force_aspect  = settings->bools.video_force_aspect;
    video.font_enable   = settings->bools.video_font_enable;
    video.swap_interval = settings->uints.video_swap_interval;
+
+   if (video_driver_crt_switching_active)
+       video.swap_interval = 0;
+
 #ifdef GEKKO
    video.viwidth       = settings->uints.video_viwidth;
    video.vfilter       = settings->bools.video_vfilter;
@@ -2619,6 +2623,12 @@ void video_driver_frame(const void *data, unsigned width,
    {
       video_driver_crt_switching_active = true;
 
+      if (height > 300)
+         current_video_context.swap_interval(video_context_data, 0);
+
+      if (height < 300)
+         current_video_context.swap_interval(video_context_data, 1);
+
       if (video_info.crt_switch_resolution_super == 2560)
          width = 2560;
       if (video_info.crt_switch_resolution_super == 3840)
@@ -3186,10 +3196,14 @@ bool video_context_driver_get_video_output_size(gfx_ctx_size_t *size_data)
 
 bool video_context_driver_swap_interval(unsigned *interval)
 {
+   if (!video_driver_crt_switching_active)
+   {
    if (!current_video_context.swap_interval)
       return false;
    current_video_context.swap_interval(video_context_data, *interval);
    return true;
+   }
+   return true;
 }
 
 bool video_context_driver_get_proc_address(gfx_ctx_proc_address_t *proc)