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| author | Edward Welbourne <edward.welbourne@qt.io> | 2017-07-04 20:22:08 +0200 |
|---|---|---|
| committer | Edward Welbourne <edward.welbourne@qt.io> | 2017-07-14 09:08:43 +0000 |
| commit | 9c8d5d82b6c222f8dbbe60ec0b9382bb75b52f42 (patch) | |
| tree | 9505f53db7ec53a75c431b8bbe90c6fa760ec1d3 /examples/svg | |
| parent | 5e80f69c33f696e8c62ac74fbb9a91de61cfe65d (diff) | |
| download | qtsvg-9c8d5d82b6c222f8dbbe60ec0b9382bb75b52f42.tar.gz | |
Replace a float[128][128] with a single float
The whole array was incremented in lock-step so that, when values were
being read, they all had the same value; so a single float can hold
that value, instead of 16k copies of it.
Change-Id: Ib1bd31513eb7fe9e500f16f37a1c3653426c896c
Reviewed-by: hjk <hjk@qt.io>
Diffstat (limited to 'examples/svg')
| -rw-r--r-- | examples/svg/opengl/framebufferobject/glwidget.cpp | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/examples/svg/opengl/framebufferobject/glwidget.cpp b/examples/svg/opengl/framebufferobject/glwidget.cpp index f7d94db..805e731 100644 --- a/examples/svg/opengl/framebufferobject/glwidget.cpp +++ b/examples/svg/opengl/framebufferobject/glwidget.cpp @@ -300,7 +300,9 @@ void GLWidget::timerEvent(QTimerEvent *) rot_z += 0.3f; rot_x += 0.1f; - static float wt[128][128]; + static float wt = 0.0; + wt += 0.1f; + const int width = logo.width(); const int dx = width >> 1, dy = dx; // disturbance point const float W = .3f; @@ -310,8 +312,7 @@ void GLWidget::timerEvent(QTimerEvent *) for (int i = 0; i < width; ++i) { for (int j = 0; j < width; ++j) { const float s = hypot(j - dx, i - dy); - wt[i][j] += 0.1f; - const double raw = AMP * sin(2 * M_PI * W * (wt[i][j] + s / v)); + const double raw = AMP * sin(2 * M_PI * W * (wt + s / v)); if (s != 0) wave[i * width + j] = raw / (0.2 * (s + 2)); else |