1 files changed, 83 insertions, 0 deletions
diff --git a/slideshow/opengl/honeycombVertexShader.glsl b/slideshow/opengl/honeycombVertexShader.glsl
new file mode 100644
index 000000000000..b54efbdb6ccf
--- /dev/null
+++ b/slideshow/opengl/honeycombVertexShader.glsl
@@ -0,0 +1,83 @@
+/* -*- 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 150
+
+#define M_PI 3.1415926535897932384626433832795
+
+in vec3 a_position;
+
+uniform mat4 u_projectionMatrix;
+uniform mat4 u_modelViewMatrix;
+uniform mat4 u_sceneTransformMatrix;
+uniform mat4 u_primitiveTransformMatrix;
+uniform mat4 u_operationsTransformMatrix;
+
+uniform float time;
+uniform float selectedTexture;
+
+out mat4 modelViewProjectionMatrix;
+
+mat4 translationMatrix(vec3 axis)
+{
+    return mat4(1.0,    0.0,    0.0,    0.0,
+                0.0,    1.0,    0.0,    0.0,
+                0.0,    0.0,    1.0,    0.0,
+                axis.x, axis.y, axis.z, 1.0);
+}
+
+mat4 scaleMatrix(vec3 axis)
+{
+    return mat4(axis.x, 0.0,    0.0,    0.0,
+                0.0,    axis.y, 0.0,    0.0,
+                0.0,    0.0,    axis.z, 0.0,
+                0.0,    0.0,    0.0,    1.0);
+}
+
+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);
+}
+
+void main( void )
+{
+    mat4 modelViewMatrix = u_modelViewMatrix * u_operationsTransformMatrix * u_sceneTransformMatrix * u_primitiveTransformMatrix;
+    mat4 transformMatrix;
+
+    // TODO: use the aspect ratio of the slide instead.
+    mat4 slideScaleMatrix = scaleMatrix(vec3(0.75, 1, 1));
+    mat4 invertSlideScaleMatrix = scaleMatrix(1.0 / vec3(0.75, 1, 1));
+
+    if (selectedTexture > 0.5) {
+        // Leaving texture
+        transformMatrix = translationMatrix(vec3(0, 0, 6 * time))
+            * scaleMatrix(vec3(1 + pow(2 * time, 2.1), 1 + pow(2 * time, 2.1), 0))
+            * slideScaleMatrix
+            * rotationMatrix(vec3(0.0, 0.0, 1.0), -pow(time, 3) * M_PI)
+            * invertSlideScaleMatrix;
+    } else {
+        // Entering texture
+        transformMatrix = translationMatrix(vec3(0, 0, 28 * (sqrt(time) - 1)))
+            * slideScaleMatrix
+            * rotationMatrix(vec3(0.0, 0.0, 1.0), pow(time - 1, 2) * M_PI)
+            * invertSlideScaleMatrix;
+    }
+    modelViewProjectionMatrix = u_projectionMatrix * modelViewMatrix * transformMatrix;
+    gl_Position = vec4(a_position, 1.0);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */