First argument to pow is not allowed to be negative.
Task-number: QTBUG-30191
Change-Id: Iac6c25d84e26777564d6741690aab552a0bb513e
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>
"uniform lowp float t;"
"varying highp vec2 coords;"
"void main() {"
- " lowp float i = 1. - (pow(coords.x, 4.) + pow(coords.y, 4.));"
+ " lowp float i = 1. - (pow(abs(coords.x), 4.) + pow(abs(coords.y), 4.));"
" i = smoothstep(t - 0.8, t + 0.8, i);"
" i = floor(i * 20.) / 20.;"
" gl_FragColor = vec4(coords * .5 + .5, i, i);"