slideshow: Reimplement reflections in shaders, and port Rochade and TurnAround

This removes the hack reflections were previously, where a black quad
was drawn on top of a mirror version of the first primitive only.

Change-Id: I8c0863ab30e85d0130a8d7e838f3514e9be93788

2 files changed, 88 insertions, 0 deletions

diff --git a/slideshow/opengl/reflectionFragmentShader.glsl b/slideshow/opengl/reflectionFragmentShader.glsl
new file mode 100644
index 000000000000..9bf8ecb70c3d
--- /dev/null
+++ b/slideshow/opengl/reflectionFragmentShader.glsl
@@ -0,0 +1,47 @@
+/* -*- 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 130
+
+uniform sampler2D slideTexture;
+varying float v_isShadow;
+varying vec2 v_texturePosition;
+
+void main() {
+    vec4 fragment = texture2D(slideTexture, v_texturePosition);
+    if (v_isShadow > 0.5) {
+        if (v_texturePosition.y > 1.0 - 0.3)
+            gl_FragColor = mix(fragment, vec4(0.0, 0.0, 0.0, 0.0), (1.0 - v_texturePosition.y) / 0.3);
+        else
+            discard;
+    } else {
+        gl_FragColor = fragment;
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/slideshow/opengl/reflectionVertexShader.glsl b/slideshow/opengl/reflectionVertexShader.glsl
new file mode 100644
index 000000000000..b08d0cc82f59
--- /dev/null
+++ b/slideshow/opengl/reflectionVertexShader.glsl
@@ -0,0 +1,41 @@
+/* -*- 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 2008 by Sun Microsystems, Inc.
+ *
+ * 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 130
+
+varying float v_isShadow;
+varying vec2 v_texturePosition;
+
+void main( void )
+{
+    gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
+    v_texturePosition = gl_MultiTexCoord0.xy;
+    v_isShadow = float(gl_VertexID >= 6);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */