Initial work on a "Vortex" transition

The actual transition is not yet at all like the one in the competing
product. But some basic ideas are in place.

Change-Id: Ie17a4fe03ae93abe51a2f1f760f417ee4b193e2c

1 files changed, 88 insertions, 0 deletions

diff --git a/slideshow/opengl/vortexVertexShader.glsl b/slideshow/opengl/vortexVertexShader.glsl
new file mode 100755
index 000000000000..63e80e4fc0bd
--- /dev/null
+++ b/slideshow/opengl/vortexVertexShader.glsl
@@ -0,0 +1,88 @@
+/* -*- 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.
+ *
+ ************************************************************************/
+
+#define M_PI 3.1415926535897932384626433832795
+
+uniform float time;
+uniform sampler2D permTexture;
+attribute vec2 center;
+attribute int tileXIndex;
+attribute int tileYIndex;
+attribute int vertexIndexInTile;
+varying vec2 v_texturePosition;
+
+float snoise(vec2 p)
+{
+    return texture2D(permTexture, p).r;
+}
+
+mat4 rotationMatrix(vec3 axis, float angle)
+{
+    axis = normalize(axis);
+    float s = sin(angle);
+    float c = cos(angle);
+    float oc = 1.0 - c;
+
+    return mat4(oc * axis.x * axis.x + c,           oc * axis.x * axis.y - axis.z * s,  oc * axis.z * axis.x + axis.y * s,  0.0,
+                oc * axis.x * axis.y + axis.z * s,  oc * axis.y * axis.y + c,           oc * axis.y * axis.z - axis.x * s,  0.0,
+                oc * axis.z * axis.x - axis.y * s,  oc * axis.y * axis.z + axis.x * s,  oc * axis.z * axis.z + c,           0.0,
+                0.0,                                0.0,                                0.0,                                1.0);
+}
+
+mat4 translateMatrix(vec2 whereTo)
+{
+    return mat4(1, 0, 0, whereTo.x,
+                0, 1, 0, whereTo.y,
+                0, 0, 1,         0,
+                0, 0, 0,         1);
+}
+
+void main( void )
+{
+    vec4 v = gl_Vertex;
+
+    // Of course this is nothing like what it will eventually be; just
+    // experimenting to get at least something.
+
+    v -= vec4(center, 0, 0);
+    if (time <= 0.5)
+        v = rotationMatrix(vec3(0, 1, 0), time*M_PI) * v;
+    else
+        v = rotationMatrix(vec3(0, 1, 0), -(1-time)*M_PI) * v;
+    v += vec4(center, 0, 0);
+
+    // v.z += 10 * (snoise(vec2(tileXIndex, tileYIndex))-0.5) * (1 - abs(time-0.5)*2);
+
+    v.z += ((((tileXIndex << 3) ^ tileYIndex) % 10) - 5) * (1 - abs(time-0.5)*2) + 0*vertexIndexInTile;
+
+    gl_Position = gl_ProjectionMatrix * gl_ModelViewMatrix * v;
+
+    v_texturePosition = gl_MultiTexCoord0.xy;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */