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Add a Uniform object for RandomAlgorithm

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This object contains several random numbers for the GPU kernel to use when generating random points. This isn't right yet (there are still patterns in the generated data) but it's time to move on...
This commit is contained in:
Eryn Wells 2018-11-07 16:47:07 -05:00
parent 76f0065d8b
commit 11b9cba8ac
6 changed files with 66 additions and 6 deletions
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10
Terrain2/TerrainAlgorithms.metal
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@ -49,12 +49,14 @@ kernel void zeroKernel(texture2d<float, access::write> outTexture [[texture(Gene
outTexture.write(0, tid);
}
#pragma mark - RandomAlgorithm
kernel void randomKernel(texture2d<float, access::write> outTexture [[texture(GeneratorTextureIndexOut)]],
uint2 tid [[thread_position_in_grid]],
uint2 tgid [[threadgroup_position_in_grid]])
constant RandomAlgorithmUniforms &uniforms [[buffer(0)]],
uint2 tid [[thread_position_in_grid]])
{
PRNG rng(tid.x * tid.y);
uint r = rng.lcg();
PRNG rng(uniforms.randoms[(tid.x * tid.y) % kRandomAlgorithmUniforms_RandomCount]);
uint r = rng.xorShift();
float x = float(r * (1.0 / float(UINT_MAX))) * 0.5f;
outTexture.write(x, tid);
}