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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.
*/
//Vertex Shader
/** (w,h,1/w,1/h) */
uniform vec4 sourceSize;
/** Pixel position of the first red pixel in the */
/** Bayer pattern. [{0,1}, {0, 1}]*/
uniform vec2 firstRed;
/** .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 = gl_MultiTexCoord0.xy;
center.zw = gl_MultiTexCoord0.xy * sourceSize.xy + firstRed;
vec2 invSize = sourceSize.zw;
xCoord = center.x + vec4(-2.0 * invSize.x,
-invSize.x, invSize.x, 2.0 * invSize.x);
yCoord = center.y + vec4(-2.0 * invSize.y,
-invSize.y, invSize.y, 2.0 * invSize.y);
gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
}
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