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++ // Copyright (C) 2023 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
++
++ void MAIN()
++ {
++ vec4 clipWRow = vec4(INSTANCE_MODELVIEWPROJECTION_MATRIX[0][3],
++ INSTANCE_MODELVIEWPROJECTION_MATRIX[1][3],
++ INSTANCE_MODELVIEWPROJECTION_MATRIX[2][3],
++ INSTANCE_MODELVIEWPROJECTION_MATRIX[3][3]);
++
++ // Reduce angle before sin/cos: dot(clipWRow, offset) can be in the hundreds of
++ // thousands, and GPU sin/cos argument reduction for large float32 values is
++ // hardware-dependent. mod() is plain IEEE 754 arithmetic and gives consistent
++ // results everywhere.
++ float weight = mod(dot(clipWRow, offset), 2.0 * 3.14159265358979);
++ vec3 pos = sin(weight) * MORPH_POSITION(0) + cos(weight) * MORPH_POSITION(1) +
++ (1 - sin(weight) - cos(weight)) * VERTEX;
++
++ POSITION = INSTANCE_MODELVIEWPROJECTION_MATRIX * vec4(pos, 1.0);
++ }