1 files changed, 36 insertions, 0 deletions
diff --git a/slideshow/opengl/glitterFragmentShader.glsl b/slideshow/opengl/glitterFragmentShader.glsl
new file mode 100644
index 000000000..71881742c
--- /dev/null
+++ b/slideshow/opengl/glitterFragmentShader.glsl
@@ -0,0 +1,36 @@
+/* -*- 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
+
+#define M_PI 3.1415926535897932384626433832795
+
+uniform sampler2D leavingSlideTexture;
+uniform sampler2D enteringSlideTexture;
+varying vec2 v_texturePosition;
+varying vec3 v_normal;
+
+uniform float time;
+varying float angle;
+
+void main() {
+    vec3 lightVector = vec3(0.0, 0.0, 1.0);
+    float light = dot(lightVector, v_normal);
+
+    vec4 fragment;
+    if (angle < M_PI)
+        fragment = texture2D(leavingSlideTexture, v_texturePosition);
+    else
+        fragment = texture2D(enteringSlideTexture, v_texturePosition);
+
+    vec4 black = vec4(0.0, 0.0, 0.0, fragment.a);
+    gl_FragColor = mix(black, fragment, max(light, 0.0));
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */