// Passing in clip and importer separately as we're not completely done with the asset setup at the time we're asked to generate the preview.
private void DoRenderPreview(bool setMaterial, AudioClip clip, AudioImporter audioImporter, Rect wantedRect, float scaleFactor)
{
scaleFactor *= 0.95f; // Reduce amplitude slightly to make highly compressed signals fit.
float[] minMaxData = (audioImporter == null) ? null : AudioUtil.GetMinMaxData(audioImporter);
int numChannels = clip.channels;
int numSamples = (minMaxData == null) ? 0 : (minMaxData.Length / (2 * numChannels));
float h = (float)wantedRect.height / (float)numChannels;
for (int channel = 0; channel < numChannels; channel++)
{
Rect channelRect = new Rect(wantedRect.x, wantedRect.y + h * channel, wantedRect.width, h);
Color curveColor = new Color(1.0f, 140.0f / 255.0f, 0.0f, 1.0f);
AudioCurveRendering.AudioMinMaxCurveAndColorEvaluator dlg = delegate(float x, out Color col, out float minValue, out float maxValue)
{
col = curveColor;
if (numSamples <= 0)
{
minValue = 0.0f;
maxValue = 0.0f;
}
else
{
float p = Mathf.Clamp(x * (numSamples - 2), 0.0f, numSamples - 2);
int i = (int)Mathf.Floor(p);
int offset1 = (i * numChannels + channel) * 2;
int offset2 = offset1 + numChannels * 2;
minValue = Mathf.Min(minMaxData[offset1 + 1], minMaxData[offset2 + 1]) * scaleFactor;
maxValue = Mathf.Max(minMaxData[offset1 + 0], minMaxData[offset2 + 0]) * scaleFactor;
if (minValue > maxValue)
{
float tmp = minValue; minValue = maxValue; maxValue = tmp;
}
}
};
if (setMaterial)
{
AudioCurveRendering.DrawMinMaxFilledCurve(channelRect, dlg);
}
else
{
AudioCurveRendering.DrawMinMaxFilledCurveInternal(channelRect, dlg);
}
}
}
