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+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+From http://jgt.akpeters.com/papers/McGuire08/
+
+Efficient, High-Quality Bayer Demosaic Filtering on GPUs
+
+Morgan McGuire
+
+This paper appears in issue Volume 13, Number 4.
+---------------------------------------------------------
+Copyright (c) 2008, Morgan McGuire. All rights reserved.
+
+Modified by Linaro Ltd to integrate it into libcamera.
+Copyright (C) 2021, Linaro
+*/
+
+//Vertex Shader
+
+attribute vec4 vertexIn;
+attribute vec2 textureIn;
+
+uniform vec2 tex_size;	/* The texture size in pixels */
+uniform vec2 tex_step;
+
+/** Pixel position of the first red pixel in the */
+/**  Bayer pattern.  [{0,1}, {0, 1}]*/
+uniform vec2            tex_bayer_first_red;
+
+/** .xy = Pixel being sampled in the fragment shader on the range [0, 1]
+    .zw = ...on the range [0, sourceSize], offset by firstRed */
+varying vec4            center;
+
+/** center.x + (-2/w, -1/w, 1/w, 2/w); These are the x-positions */
+/** of the adjacent pixels.*/
+varying vec4            xCoord;
+
+/** center.y + (-2/h, -1/h, 1/h, 2/h); These are the y-positions */
+/** of the adjacent pixels.*/
+varying vec4            yCoord;
+
+void main(void) {
+    center.xy = textureIn;
+    center.zw = textureIn * tex_size + tex_bayer_first_red;
+
+    xCoord = center.x + vec4(-2.0 * tex_step.x,
+                             -tex_step.x, tex_step.x, 2.0 * tex_step.x);
+    yCoord = center.y + vec4(-2.0 * tex_step.y,
+                              -tex_step.y, tex_step.y, 2.0 * tex_step.y);
+
+    gl_Position = vertexIn;
+}