slideshow: Reimplement both Fade transitions in shaders

Change-Id: I94187b9316a206578bb738411053afe070703f09

2 files changed, 92 insertions, 0 deletions

diff --git a/slideshow/opengl/fadeBlackFragmentShader.glsl b/slideshow/opengl/fadeBlackFragmentShader.glsl
new file mode 100644
index 000000000000..7f80cc55adcb
--- /dev/null
+++ b/slideshow/opengl/fadeBlackFragmentShader.glsl
@@ -0,0 +1,50 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2015 by Collabora, Ltd.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+#version 120
+
+uniform sampler2D leavingSlideTexture;
+uniform sampler2D enteringSlideTexture;
+uniform float time;
+varying vec2 v_texturePosition;
+
+void main() {
+    vec4 black = vec4(0.0, 0.0, 0.0, 1.0);
+    vec4 texel;
+    float amount;
+    if (time < 0.5) {
+        texel = texture2D(leavingSlideTexture, v_texturePosition);
+        amount = time * 2;
+    } else {
+        texel = texture2D(enteringSlideTexture, v_texturePosition);
+        amount = (1.0 - time) * 2;
+    }
+    gl_FragColor = mix(texel, black, amount);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/slideshow/opengl/fadeFragmentShader.glsl b/slideshow/opengl/fadeFragmentShader.glsl
new file mode 100644
index 000000000000..aab848e3c917
--- /dev/null
+++ b/slideshow/opengl/fadeFragmentShader.glsl
@@ -0,0 +1,42 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2015 by Collabora, Ltd.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+#version 120
+
+uniform sampler2D leavingSlideTexture;
+uniform sampler2D enteringSlideTexture;
+uniform float time;
+varying vec2 v_texturePosition;
+
+void main() {
+    vec4 leavingFragment = texture2D(leavingSlideTexture, v_texturePosition);
+    vec4 enteringFragment = texture2D(enteringSlideTexture, v_texturePosition);
+    gl_FragColor = mix(leavingFragment, enteringFragment, time);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */