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++ // Copyright (C) 2025 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
++ #version 440
++
++ layout (location = 0) in vec4 vPosition;
++ layout (location = 1) in vec4 vPrevPosition;
++
++ layout (location = 0) out vec4 fragColor;
++
++ layout (std140, binding = 0) uniform buf {
++ mat4 mvp;
++ mat4 prevMVP;
++ mat4 instanceLocal;
++ mat4 instanceGlobal;
++ mat4 prevInstanceLocal;
++ mat4 prevInstanceGlobal;
++ vec4 currentAndLastJitter;
++ float velocityAmount;
++ int morphTargetCount;
++ vec2 padding;
++ } ubuf;
++
++
++ void main()
++ {
++ vec2 a = (vPosition.xy / vPosition.w);
++ vec2 b = (vPrevPosition.xy / vPrevPosition.w);
++
++ a -= ubuf.currentAndLastJitter.zw;
++ b -= ubuf.currentAndLastJitter.xy;
++
++ a = a * 0.5 - 0.5;
++ b = b * 0.5 - 0.5;
++
++ vec2 v;
++ v.x = b.x - a.x;
++
++ #if defined(QSHADER_HLSL) || defined(QSHADER_MSL)
++ v.y = b.y - a.y;
++ #else
++ v.y = a.y - b.y;
++ #endif
++
++ fragColor = vec4(v * ubuf.velocityAmount, v);
++ }