1 files changed, 30 insertions, 0 deletions
diff --git a/vcl/opengl/shaders/convolutionFragmentShader.glsl b/vcl/opengl/shaders/convolutionFragmentShader.glsl
new file mode 100644
index 000000000..4b2f316e0
--- /dev/null
+++ b/vcl/opengl/shaders/convolutionFragmentShader.glsl
@@ -0,0 +1,30 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/* TODO Use textureOffset for newest version of GLSL */
+
+#version 130
+
+uniform sampler2D sampler;
+uniform vec2 offsets[16];
+uniform float kernel[16];
+
+varying vec2 tex_coord;
+
+void main(void)
+{
+    vec4 sum = texture2D(sampler, tex_coord.st) * kernel[0];
+    for (int i = 1; i < 16; i++) {
+        sum += texture2D(sampler, tex_coord.st - offsets[i]) * kernel[i];
+        sum += texture2D(sampler, tex_coord.st + offsets[i]) * kernel[i];
+    }
+    gl_FragColor = sum;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */