From 847962910f0bff071f3bf07c9abb87764fb6cac3 Mon Sep 17 00:00:00 2001
From: claude-bot <claude@ancap.in.ua>
Date: Mon, 13 Jul 2026 12:40:03 +0000
Subject: Import aap/librw @ master

Snapshot for re3/reVC vendoring, per @lzcnt.
Source: https://github.com/aap/librw (master).
---
 src/gl/shaders/header.frag | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 src/gl/shaders/header.frag

(limited to 'src/gl/shaders/header.frag')

diff --git a/src/gl/shaders/header.frag b/src/gl/shaders/header.frag
new file mode 100644
index 0000000..ba50165
--- /dev/null
+++ b/src/gl/shaders/header.frag
@@ -0,0 +1,30 @@
+#ifdef USE_UBOS
+layout(std140) uniform State
+{
+	vec2 u_alphaRef;
+	vec4  u_fogData;
+	vec4  u_fogColor;
+};
+#else
+uniform vec4 u_alphaRef;
+
+uniform vec4  u_fogData;
+uniform vec4  u_fogColor;
+#endif
+
+#define u_fogStart (u_fogData.x)
+#define u_fogEnd (u_fogData.y)
+#define u_fogRange (u_fogData.z)
+#define u_fogDisable (u_fogData.w)
+
+#ifndef GL2
+out vec4 fragColor;
+#endif
+
+void DoAlphaTest(float a)
+{
+#ifndef NO_ALPHATEST
+	if(a < u_alphaRef.x || a >= u_alphaRef.y)
+		discard;
+#endif
+}
-- 
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