1 files changed, 79 insertions, 0 deletions
diff --git a/slideshow/opengl/reflectionVertexShader.glsl b/slideshow/opengl/reflectionVertexShader.glsl
new file mode 100644
index 000000000..6c0c41c75
--- /dev/null
+++ b/slideshow/opengl/reflectionVertexShader.glsl
@@ -0,0 +1,79 @@
+/* -*- 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 130
+
+attribute vec3 a_position;
+attribute vec3 a_normal;
+attribute vec2 a_texCoord;
+
+uniform mat4 u_projectionMatrix;
+uniform mat4 u_modelViewMatrix;
+uniform mat4 u_sceneTransformMatrix;
+uniform mat4 u_primitiveTransformMatrix;
+uniform mat4 u_operationsTransformMatrix;
+
+varying vec2 v_texturePosition;
+varying vec3 v_normal;
+varying float v_isShadow;
+
+#if __VERSION__ < 140
+mat4 inverse(mat4 m)
+{
+    float a00 = m[0][0], a01 = m[0][1], a02 = m[0][2], a03 = m[0][3];
+    float a10 = m[1][0], a11 = m[1][1], a12 = m[1][2], a13 = m[1][3];
+    float a20 = m[2][0], a21 = m[2][1], a22 = m[2][2], a23 = m[2][3];
+    float a30 = m[3][0], a31 = m[3][1], a32 = m[3][2], a33 = m[3][3];
+
+    float b00 = a00 * a11 - a01 * a10;
+    float b01 = a00 * a12 - a02 * a10;
+    float b02 = a00 * a13 - a03 * a10;
+    float b03 = a01 * a12 - a02 * a11;
+    float b04 = a01 * a13 - a03 * a11;
+    float b05 = a02 * a13 - a03 * a12;
+    float b06 = a20 * a31 - a21 * a30;
+    float b07 = a20 * a32 - a22 * a30;
+    float b08 = a20 * a33 - a23 * a30;
+    float b09 = a21 * a32 - a22 * a31;
+    float b10 = a21 * a33 - a23 * a31;
+    float b11 = a22 * a33 - a23 * a32;
+
+    float det = b00 * b11 - b01 * b10 + b02 * b09 + b03 * b08 - b04 * b07 + b05 * b06;
+
+    return mat4(
+        a11 * b11 - a12 * b10 + a13 * b09,
+        a02 * b10 - a01 * b11 - a03 * b09,
+        a31 * b05 - a32 * b04 + a33 * b03,
+        a22 * b04 - a21 * b05 - a23 * b03,
+        a12 * b08 - a10 * b11 - a13 * b07,
+        a00 * b11 - a02 * b08 + a03 * b07,
+        a32 * b02 - a30 * b05 - a33 * b01,
+        a20 * b05 - a22 * b02 + a23 * b01,
+        a10 * b10 - a11 * b08 + a13 * b06,
+        a01 * b08 - a00 * b10 - a03 * b06,
+        a30 * b04 - a31 * b02 + a33 * b00,
+        a21 * b02 - a20 * b04 - a23 * b00,
+        a11 * b07 - a10 * b09 - a12 * b06,
+        a00 * b09 - a01 * b07 + a02 * b06,
+        a31 * b01 - a30 * b03 - a32 * b00,
+        a20 * b03 - a21 * b01 + a22 * b00) / det;
+}
+#endif
+
+void main( void )
+{
+    mat4 modelViewMatrix = u_modelViewMatrix * u_operationsTransformMatrix * u_sceneTransformMatrix * u_primitiveTransformMatrix;
+    mat3 normalMatrix = mat3(transpose(inverse(modelViewMatrix)));
+    gl_Position = u_projectionMatrix * modelViewMatrix * vec4(a_position, 1.0);
+    v_texturePosition = a_texCoord;
+    v_normal = normalize(normalMatrix * a_normal);
+    v_isShadow = float(gl_VertexID >= 6);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */