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[MetaballsKit] Implement sampling kernel

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This commit is contained in:
Eryn Wells 2017-08-01 19:13:20 -07:00
parent cacdba4555
commit 0aab90b693
1 changed files with 13 additions and 4 deletions
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17
MetaballsKit/SamplingKernel.metal
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@ -16,9 +16,18 @@ typedef struct {
} Ball;
kernel void
sampleFieldKernel(const device Ball* metaballs [[buffer(0)]],
texture2d<half, access::write> [[texture(1)]],
uint2 gid [[thread_position_in_grid]])
sampleFieldKernel(constant Ball* balls [[buffer(0)]],
texture2d<half, access::write> samples [[texture(1)]],
uint2 gid [[thread_position_in_grid]])
{
// TODO: Compute a sample for this pixel given the field data, and write it to the out texture.
float sample = 0.0;
// TODO: Get number of metaballs.
for (int i = 0; i < 2; i++) {
constant Ball& ball = metaballs[i];
float r2 = ball.radius * ball.radius;
float xDiff = gid[0] - ball.position[0];
float yDiff = gid[1] - ball.position[1];
sample += r2 / ((xDiff * xDiff) + (yDiff * yDiff));
}
samples.write(sample, gid);
}