jsl-decora.BoxBlur.jsl Maven / Gradle / Ivy
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* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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<<
private FloatBuffer offsets;
private float getScale() {
return 1.0f / getCount();
}
private int getCount() {
return getEffect().getRadius() * 2 + 1;
}
private FloatBuffer getOffsets() {
int r = getEffect().getRadius();
int klen = (r * 2) + 1;
float xoff, yoff;
if (getPass() == 0) {
// horizontal pass
xoff = 1f / getInputNativeBounds(0).width;
yoff = 0f;
} else {
// vertical pass
xoff = 0f;
yoff = 1f / getInputNativeBounds(0).height;
}
if (offsets == null) {
offsets = BufferUtil.newFloatBuffer(129*4);
}
offsets.clear();
for (int row = -r; row <= r; row++) {
offsets.put(row * xoff);
offsets.put(row * yoff);
offsets.put(0f); // unused
offsets.put(0f); // unused
}
int limit = r * 2 + 1;
limit = 10 * ((limit + 9) / 10);
if (limit > 129) limit = 129;
limit *= 4;
while (offsets.position() < limit) {
offsets.put(2f);
offsets.put(2f);
offsets.put(0f);
offsets.put(0f);
}
offsets.rewind();
return offsets;
}
>>
param sampler img;
param int count;
const int MAX_KERNEL_SIZE = 129;
// value for each location in the offsets array:
// offsets[i].x = offsetX[i]
// offsets[i].y = offsetY[i]
param float4 offsets[MAX_KERNEL_SIZE];
param float scale;
void main()
{
int i;
float4 tmp = float4(0.0, 0.0, 0.0, 0.0);
unroll (%d, 0) for (i = 0; i < count; i++) {
tmp += sample(img, pos0 + offsets[i].xy);
}
color = scale * tmp;
}