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CultMath: infinite.json written by oracle.py on Yggdrasil (Blender 5.2.2, SSE4.2); CultMath.Cycles.glsl regenerated for the power parity

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infinite.json holds 47 cases of infinite operands for cycles_power, cycles_modulo and Map Range Smooth Step, made inside Blender's kernel; only that family was regenerated. CultMath.Cycles.glsl changed by the generator alone (CULTMATH_WRITE_GLSL=1); glsl-parity.json and CultMath.glsl are byte-identical. This commit builds and its tests are expected green.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Meta Vens 2026-10-14 04:46:11 +02:00
commit 53f4c21311
2 changed files with 77 additions and 1 deletions
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3
packages/cultmath/shaders/CultMath.Cycles.glsl
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@ -42,7 +42,8 @@ float cultmath_cycles_power(float a, float b)
if (a < 0.0)
{
float magnitude = pow(-a, b);
return b - 2.0 * floor(0.5 * b) != 0.0 ? -magnitude : magnitude;
// Odd exactly when the remainder is 1: an infinite exponent leaves NaN here and is even, as powf(a, +-inf) is never negative.
return b - 2.0 * floor(0.5 * b) == 1.0 ? -magnitude : magnitude;
}
return pow(a, b);
}

75
packages/cultmath/tests/CultMath.Tests/fixtures/cycles-oracle/infinite.json Normal file
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@ -0,0 +1,75 @@
{
"oracle": "tools/cycles-oracle/oracle.py (Blender 5.2.2 LTS, build d13f752e3b9c, Cycles CPU, 1 sample, Emit bake, float Non-Color images)",
"blender": "5.2.2 LTS",
"build_hash": "d13f752e3b9c",
"platform": "Linux",
"encoding": "each case is 'operands -> results', every scalar a float32 bit pattern in hex, colours flattened as r g b",
"family": "infinite",
"functions": [
{
"function": "cycles_power",
"node": "ShaderNodeMath POWER",
"cases": [
"bf800000 inf -> 3f800000",
"bf800000 -inf -> 3f800000",
"c0000000 inf -> inf",
"c0000000 -inf -> 00000000",
"bf000000 inf -> 00000000",
"bf000000 -inf -> inf",
"80000000 inf -> 00000000",
"80000000 -inf -> 00000000",
"3f000000 inf -> 00000000",
"3f000000 -inf -> inf",
"40000000 inf -> inf",
"40000000 -inf -> 00000000",
"3f800000 inf -> 3f800000",
"00000000 inf -> 00000000",
"00000000 -inf -> 00000000",
"inf 40400000 -> inf",
"-inf 40400000 -> -inf",
"-inf 40000000 -> inf",
"inf bf800000 -> 00000000",
"-inf bf800000 -> 00000000",
"-inf inf -> inf",
"inf inf -> inf"
]
},
{
"function": "cycles_modulo",
"node": "ShaderNodeMath MODULO",
"cases": [
"inf 3f800000 -> nan",
"-inf 3f800000 -> nan",
"inf 40400000 -> nan",
"-inf 40400000 -> nan",
"inf 3dcccccd -> nan",
"-inf 3dcccccd -> nan",
"inf c0000000 -> nan",
"40a00000 inf -> 40a00000",
"c0a00000 inf -> c0a00000",
"40a00000 -inf -> 40a00000",
"inf inf -> nan",
"-inf inf -> nan",
"00000000 inf -> 00000000",
"inf 00000000 -> 00000000"
]
},
{
"function": "cycles_map_range_smoothstep",
"node": "ShaderNodeMapRange SMOOTHSTEP",
"cases": [
"-inf -inf 3f800000 40000000 40400000 -> nan",
"-inf 3f800000 -inf 40000000 40400000 -> nan",
"-inf 3f800000 40a00000 40000000 40400000 -> 40000000",
"-inf c0a00000 3f800000 40000000 40400000 -> 40000000",
"inf c0a00000 3f800000 40000000 40400000 -> 40400000",
"inf 3f800000 c0a00000 40000000 40400000 -> 40000000",
"inf inf 3f800000 40000000 40400000 -> 40000000",
"inf 3f800000 inf 40000000 40400000 -> 40400000",
"-inf inf 3f800000 40000000 40400000 -> 40400000",
"-inf 3f800000 inf 40000000 40400000 -> 40000000",
"3f800000 -inf inf 40000000 40400000 -> nan"
]
}
]
}