From e7003b5bef3c64e84b0656abff70be8c1f08729a Mon Sep 17 00:00:00 2001
From: Lukas Rusak <lorusak@gmail.com>
Date: Thu, 7 Sep 2017 18:45:08 -0700
Subject: LinuxRendererGLES: implement hq scalers

---
 system/shaders/convolution-4x4.glsl | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'system/shaders/convolution-4x4.glsl')

diff --git a/system/shaders/convolution-4x4.glsl b/system/shaders/convolution-4x4.glsl
index d41b127294..6413cd6819 100644
--- a/system/shaders/convolution-4x4.glsl
+++ b/system/shaders/convolution-4x4.glsl
@@ -18,11 +18,19 @@
  *
  */
 
+#ifdef GL_ES
+  precision highp float;
+#endif
+
 uniform sampler2D img;
 uniform vec2      stepxy;
 uniform float     m_stretch;
 varying vec2      cord;
 
+#ifdef GL_ES
+  uniform float     m_alpha;
+#endif
+
 #if (USE1DTEXTURE)
   uniform sampler1D kernelTex;
 #else
@@ -103,7 +111,12 @@ vec4 process()
     line(xystart.y + stepxy.y * 2.0, xpos, linetaps) * columntaps.b +
     line(xystart.y + stepxy.y * 3.0, xpos, linetaps) * columntaps.a;
 
+#ifdef GL_ES
+  rgb.a = m_alpha;
+#else
   rgb.a = gl_Color.a;
+#endif
+
   return rgb;
 }
 
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