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{
"QEN": {
"description": "Bends the source to circle / arc in the vertex shader.",
"name": "CircleBend",
"properties": [
{
"defaultValue": "0",
"description": "Start angle for the circle bending in radians.",
"maxValue": "6.283",
"minValue": "0",
"name": "circleBendStartAngle",
"type": "float"
},
{
"defaultValue": "6.283",
"description": "Spanning angle for the circle bending in radians.",
"maxValue": "6.283",
"minValue": "0",
"name": "circleBendSpanAngle",
"type": "float"
},
{
"defaultValue": "0.2",
"description": "Width of the bending ring. Values are between 0.0 and 1.0 (full size of the source item).",
"maxValue": "1",
"minValue": "0",
"name": "circleBendRingWidth",
"type": "float"
},
{
"customValue": "Qt.point(width, height)",
"defaultValue": "0, 0",
"maxValue": "1, 1",
"minValue": "0, 0",
"name": "circleBendTexSize",
"type": "vec2",
"useCustomValue": true
}
],
"version": 1,
"vertexCode": [
"@mesh 512, 1",
"@main",
"{",
" const float PI_H = 1.5707964;",
" vec2 vPos = vec2(0.5);",
" float s = 0.5 - 0.5 * circleBendRingWidth + texCoord.y * 0.5 * circleBendRingWidth;",
" float spanX = texCoord.x * circleBendSpanAngle;",
" vPos.x += s * sin(circleBendStartAngle + spanX);",
" vPos.y += s * sin(circleBendStartAngle + spanX + PI_H);",
" vPos *= circleBendTexSize;",
" vertCoord = vPos;",
"}",
""
]
}
}
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