From c1de320e4e21c31e3bb5085d6a6762434f4e4f1c Mon Sep 17 00:00:00 2001
From: hunterk <hunter_kaller@yahoo.com>
Date: Tue, 19 Jul 2016 16:18:36 -0500
Subject: [PATCH] fix interlacing shader; i think framecount might be b0rk3n

---
 misc/interlacing.slang  | 14 ++++++++------
 misc/interlacing.slangp |  6 ++++++
 2 files changed, 14 insertions(+), 6 deletions(-)
 create mode 100644 misc/interlacing.slangp

diff --git a/misc/interlacing.slang b/misc/interlacing.slang
index bd2efbd..fa7e361 100644
--- a/misc/interlacing.slang
+++ b/misc/interlacing.slang
@@ -11,7 +11,7 @@ layout(std140, set = 0, binding = 0) uniform UBO
 
 #define percent 0.0
 #define enable_480i 1.0
-#define top_field_first 0.0
+#define top_field_first 1.0
 
 /*
    Interlacing
@@ -42,15 +42,17 @@ void main()
 {
    vec4 res = texture(Source, vTexCoord).rgba;
    float y = 0.0;
+   float tick = global.FrameCount;
 
    // assume anything with a vertical resolution greater than 400 lines is interlaced
-   if (global.SourceSize.w > 400.0)
-   {y = global.SourceSize.y * vTexCoord.y + (global.FrameCount * enable_480i) + top_field_first;}
+   if (global.SourceSize.y > 400.0)
+   {y = global.SourceSize.y * (vTexCoord.y + 0.5 / global.SourceSize.y) + ((tick * 1.00) * enable_480i) + top_field_first;}
    else
    {y = 2.0 * global.SourceSize.y * vTexCoord.y + top_field_first;}
 
-   if (mod(y, 2.0) > 0.99999)
-   {FragColor = res;}
+   if (mod(y, 1.99999) > 0.99999)
+   {res = res;}
    else
-   {FragColor = vec4(percent) * res;}
+   {res = vec4(percent) * res;}
+   FragColor = res;
 }
\ No newline at end of file
diff --git a/misc/interlacing.slangp b/misc/interlacing.slangp
new file mode 100644
index 0000000..c9f6ec8
--- /dev/null
+++ b/misc/interlacing.slangp
@@ -0,0 +1,6 @@
+shaders = 1
+
+shader0 = interlacing.slang
+filter_linear0 = false
+scale_type_0 = source
+frame_count_mod0 = 4