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Fixed 'magnify' shader in qmlvideofx example

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Previous shader caused untransformed pixels (those outside of the lens)
radius to be offset slightly from their original positions.

Change-Id: I4df847fdc40073a55da8777981c3fdd373937658
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>
This commit is contained in:
Gareth Stockwell
2012-02-08 15:51:32 +00:00
committed by Qt by Nokia
parent 5c0629b571
commit 50a80cd083
1 changed files with 8 additions and 5 deletions
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13
examples/video/qmlvideofx/shaders/magnify.fsh
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@@ -53,13 +53,16 @@ uniform float posY;
void main()
{
float h = diffractionIndex * 0.5 * radius;
vec2 targetSize = vec2(targetWidth, targetHeight);
vec2 tc = qt_TexCoord0;
vec2 center = vec2(posX, posY);
vec2 xy = gl_FragCoord.xy - center.xy;
float r = sqrt(xy.x * xy.x + xy.y * xy.y);
vec2 new_xy = r < radius ? xy * (radius - h) / sqrt(radius * radius - r * r) : xy;
vec2 tc = (new_xy + center) / targetSize;
tc.y = 1.0 - tc.y;
if (r < radius) {
float h = diffractionIndex * 0.5 * radius;
vec2 new_xy = r < radius ? xy * (radius - h) / sqrt(radius * radius - r * r) : xy;
vec2 targetSize = vec2(targetWidth, targetHeight);
tc = (new_xy + center) / targetSize;
tc.y = 1.0 - tc.y;
}
gl_FragColor = qt_Opacity * texture2D(source, tc);
}