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-rw-r--r--slideshow/opengl/basicFragmentShader.glsl24
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diff --git a/slideshow/opengl/basicFragmentShader.glsl b/slideshow/opengl/basicFragmentShader.glsl
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+++ b/slideshow/opengl/basicFragmentShader.glsl
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+/* -*- 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/.
+ */
+
+#version 120
+
+uniform sampler2D slideTexture;
+varying vec2 v_texturePosition;
+varying vec3 v_normal;
+
+void main() {
+ vec3 lightVector = vec3(0.0, 0.0, 1.0);
+ float light = max(dot(lightVector, v_normal), 0.0);
+ vec4 fragment = texture2D(slideTexture, v_texturePosition);
+ vec4 black = vec4(0.0, 0.0, 0.0, fragment.a);
+ gl_FragColor = mix(black, fragment, light);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */