254 lines
12 KiB
HLSL
254 lines
12 KiB
HLSL
#ifndef CULTMATH_HLSL
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#define CULTMATH_HLSL
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// CultMath HLSL mirror.
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//
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// HLSL already owns the float2/float3/float4 type names and most primitive
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// intrinsics. This include names the CultMath semantic surface explicitly so
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// shader code, C# wrappers, and Rust/native parity fixtures can share the same
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// small vocabulary without local helper drift.
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static const float CULTMATH_PI = 3.14159265358979323846;
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static const float CULTMATH_TAU = 6.28318530717958647692;
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static const float CULTMATH_HALF_PI = 1.57079632679489661923;
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static const float CULTMATH_NORMALIZE_EPSILON = 1.0e-20;
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float cultmath_radians(float degrees_value) { return degrees_value * (CULTMATH_PI / 180.0); }
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float cultmath_degrees(float radians_value) { return radians_value * (180.0 / CULTMATH_PI); }
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float cultmath_frac(float value) { return value - floor(value); }
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float2 cultmath_frac(float2 value) { return value - floor(value); }
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float3 cultmath_frac(float3 value) { return value - floor(value); }
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float4 cultmath_frac(float4 value) { return value - floor(value); }
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float cultmath_clamp(float value, float minimum, float maximum) { return min(max(value, minimum), maximum); }
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float2 cultmath_clamp(float2 value, float2 minimum, float2 maximum) { return min(max(value, minimum), maximum); }
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float3 cultmath_clamp(float3 value, float3 minimum, float3 maximum) { return min(max(value, minimum), maximum); }
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float4 cultmath_clamp(float4 value, float4 minimum, float4 maximum) { return min(max(value, minimum), maximum); }
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float cultmath_saturate(float value) { return cultmath_clamp(value, 0.0, 1.0); }
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float2 cultmath_saturate(float2 value) { return cultmath_clamp(value, float2(0.0, 0.0), float2(1.0, 1.0)); }
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float3 cultmath_saturate(float3 value) { return cultmath_clamp(value, float3(0.0, 0.0, 0.0), float3(1.0, 1.0, 1.0)); }
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float4 cultmath_saturate(float4 value) { return cultmath_clamp(value, float4(0.0, 0.0, 0.0, 0.0), float4(1.0, 1.0, 1.0, 1.0)); }
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float cultmath_lerp(float start, float end, float amount) { return start + (end - start) * amount; }
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float2 cultmath_lerp(float2 start, float2 end, float2 amount) { return start + (end - start) * amount; }
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float3 cultmath_lerp(float3 start, float3 end, float3 amount) { return start + (end - start) * amount; }
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float4 cultmath_lerp(float4 start, float4 end, float4 amount) { return start + (end - start) * amount; }
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float cultmath_step(float edge, float value) { return value < edge ? 0.0 : 1.0; }
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float2 cultmath_step(float2 edge, float2 value) { return float2(cultmath_step(edge.x, value.x), cultmath_step(edge.y, value.y)); }
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float3 cultmath_step(float3 edge, float3 value) { return float3(cultmath_step(edge.x, value.x), cultmath_step(edge.y, value.y), cultmath_step(edge.z, value.z)); }
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float4 cultmath_step(float4 edge, float4 value) { return float4(cultmath_step(edge.x, value.x), cultmath_step(edge.y, value.y), cultmath_step(edge.z, value.z), cultmath_step(edge.w, value.w)); }
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float cultmath_smoothstep(float minimum, float maximum, float value)
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{
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float t = cultmath_saturate((value - minimum) / (maximum - minimum));
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return t * t * (3.0 - 2.0 * t);
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}
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float2 cultmath_smoothstep(float2 minimum, float2 maximum, float2 value)
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{
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float2 t = cultmath_saturate((value - minimum) / (maximum - minimum));
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return t * t * (float2(3.0, 3.0) - float2(2.0, 2.0) * t);
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}
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float3 cultmath_smoothstep(float3 minimum, float3 maximum, float3 value)
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{
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float3 t = cultmath_saturate((value - minimum) / (maximum - minimum));
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return t * t * (float3(3.0, 3.0, 3.0) - float3(2.0, 2.0, 2.0) * t);
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}
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float4 cultmath_smoothstep(float4 minimum, float4 maximum, float4 value)
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{
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float4 t = cultmath_saturate((value - minimum) / (maximum - minimum));
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return t * t * (float4(3.0, 3.0, 3.0, 3.0) - float4(2.0, 2.0, 2.0, 2.0) * t);
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}
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float cultmath_smoothstep01(float value) { return cultmath_smoothstep(0.0, 1.0, value); }
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float cultmath_smootherstep(float value)
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{
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value = cultmath_saturate(value);
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return value * value * value * (value * (value * 6.0 - 15.0) + 10.0);
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}
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float cultmath_lengthsq(float2 value) { return dot(value, value); }
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float cultmath_lengthsq(float3 value) { return dot(value, value); }
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float cultmath_lengthsq(float4 value) { return dot(value, value); }
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float cultmath_distance(float2 left, float2 right) { return length(left - right); }
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float cultmath_distance(float3 left, float3 right) { return length(left - right); }
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float cultmath_distance(float4 left, float4 right) { return length(left - right); }
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float2 cultmath_normalize(float2 value) { return value / max(length(value), CULTMATH_NORMALIZE_EPSILON); }
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float3 cultmath_normalize(float3 value) { return value / max(length(value), CULTMATH_NORMALIZE_EPSILON); }
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float4 cultmath_normalize(float4 value) { return value / max(length(value), CULTMATH_NORMALIZE_EPSILON); }
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float2 cultmath_reflect(float2 incident, float2 normal_value)
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{
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return incident - 2.0 * dot(normal_value, incident) * normal_value;
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}
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float3 cultmath_reflect(float3 incident, float3 normal_value)
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{
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return incident - 2.0 * dot(normal_value, incident) * normal_value;
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}
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float cultmath_csum(float2 value) { return value.x + value.y; }
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float cultmath_csum(float3 value) { return value.x + value.y + value.z; }
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float cultmath_csum(float4 value) { return value.x + value.y + value.z + value.w; }
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float cultmath_decay(float source, float lambda_value, float dt) { return source * exp(-lambda_value * dt); }
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float2 cultmath_decay(float2 source, float lambda_value, float dt) { return source * exp(-lambda_value * dt); }
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float3 cultmath_decay(float3 source, float lambda_value, float dt) { return source * exp(-lambda_value * dt); }
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float4 cultmath_decay(float4 source, float lambda_value, float dt) { return source * exp(-lambda_value * dt); }
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float cultmath_damp(float start, float end, float lambda_value, float dt)
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{
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return cultmath_lerp(start, end, 1.0 - exp(-lambda_value * dt));
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}
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float2 cultmath_damp(float2 start, float2 end, float lambda_value, float dt)
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{
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return cultmath_lerp(start, end, 1.0 - exp(-lambda_value * dt));
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}
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float3 cultmath_damp(float3 start, float3 end, float lambda_value, float dt)
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{
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return cultmath_lerp(start, end, 1.0 - exp(-lambda_value * dt));
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}
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float4 cultmath_damp(float4 start, float4 end, float lambda_value, float dt)
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{
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return cultmath_lerp(start, end, 1.0 - exp(-lambda_value * dt));
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}
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float cultmath_catmullrom(float p0, float p1, float p2, float p3, float t)
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{
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float t2 = t * t;
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float t3 = t2 * t;
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return 0.5 * ((2.0 * p1) + (p2 - p0) * t + (2.0 * p0 - 5.0 * p1 + 4.0 * p2 - p3) * t2 + (-p0 + 3.0 * p1 - 3.0 * p2 + p3) * t3);
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}
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float2 cultmath_catmullrom(float2 p0, float2 p1, float2 p2, float2 p3, float t)
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{
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float t2 = t * t;
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float t3 = t2 * t;
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return 0.5 * ((2.0 * p1) + (p2 - p0) * t + (2.0 * p0 - 5.0 * p1 + 4.0 * p2 - p3) * t2 + (-p0 + 3.0 * p1 - 3.0 * p2 + p3) * t3);
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}
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float3 cultmath_catmullrom(float3 p0, float3 p1, float3 p2, float3 p3, float t)
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{
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float t2 = t * t;
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float t3 = t2 * t;
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return 0.5 * ((2.0 * p1) + (p2 - p0) * t + (2.0 * p0 - 5.0 * p1 + 4.0 * p2 - p3) * t2 + (-p0 + 3.0 * p1 - 3.0 * p2 + p3) * t3);
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}
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float4 cultmath_catmullrom(float4 p0, float4 p1, float4 p2, float4 p3, float t)
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{
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float t2 = t * t;
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float t3 = t2 * t;
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return 0.5 * ((2.0 * p1) + (p2 - p0) * t + (2.0 * p0 - 5.0 * p1 + 4.0 * p2 - p3) * t2 + (-p0 + 3.0 * p1 - 3.0 * p2 + p3) * t3);
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}
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float cultmath_quadratic_bezier(float p0, float p1, float p2, float t)
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{
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t = cultmath_saturate(t);
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float inv = 1.0 - t;
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return inv * inv * p0 + 2.0 * inv * t * p1 + t * t * p2;
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}
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float3 cultmath_quadratic_bezier(float3 p0, float3 p1, float3 p2, float t)
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{
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t = cultmath_saturate(t);
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float inv = 1.0 - t;
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return inv * inv * p0 + 2.0 * inv * t * p1 + t * t * p2;
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}
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float cultmath_cubic_bezier(float p0, float p1, float p2, float p3, float t)
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{
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t = cultmath_saturate(t);
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float inv = 1.0 - t;
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return inv * inv * inv * p0 + 3.0 * inv * inv * t * p1 + 3.0 * inv * t * t * p2 + t * t * t * p3;
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}
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float3 cultmath_cubic_bezier(float3 p0, float3 p1, float3 p2, float3 p3, float t)
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{
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t = cultmath_saturate(t);
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float inv = 1.0 - t;
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return inv * inv * inv * p0 + 3.0 * inv * inv * t * p1 + 3.0 * inv * t * t * p2 + t * t * t * p3;
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}
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float cultmath_hash(float value) { return cultmath_frac(sin(value) * 43758.5453); }
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float cultmath_hash(float2 value) { return cultmath_hash(dot(value, float2(127.1, 311.7))); }
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float cultmath_hash(float3 value) { return cultmath_hash(dot(value, float3(127.1, 311.7, 74.7))); }
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float cultmath_value_noise(float2 position)
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{
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float2 cell = floor(position);
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float2 local = cultmath_frac(position);
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float2 u = local * local * (float2(3.0, 3.0) - float2(2.0, 2.0) * local);
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float a = cultmath_hash(cell);
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float b = cultmath_hash(cell + float2(1.0, 0.0));
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float c = cultmath_hash(cell + float2(0.0, 1.0));
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float d = cultmath_hash(cell + float2(1.0, 1.0));
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return cultmath_lerp(cultmath_lerp(a, b, u.x), cultmath_lerp(c, d, u.x), u.y);
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}
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float cultmath_value_noise_bicubic(float2 position)
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{
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float2 cell = floor(position);
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float2 local = cultmath_frac(position);
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float y0 = cultmath_catmullrom(cultmath_hash(cell + float2(-1.0, -1.0)), cultmath_hash(cell + float2(0.0, -1.0)), cultmath_hash(cell + float2(1.0, -1.0)), cultmath_hash(cell + float2(2.0, -1.0)), local.x);
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float y1 = cultmath_catmullrom(cultmath_hash(cell + float2(-1.0, 0.0)), cultmath_hash(cell + float2(0.0, 0.0)), cultmath_hash(cell + float2(1.0, 0.0)), cultmath_hash(cell + float2(2.0, 0.0)), local.x);
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float y2 = cultmath_catmullrom(cultmath_hash(cell + float2(-1.0, 1.0)), cultmath_hash(cell + float2(0.0, 1.0)), cultmath_hash(cell + float2(1.0, 1.0)), cultmath_hash(cell + float2(2.0, 1.0)), local.x);
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float y3 = cultmath_catmullrom(cultmath_hash(cell + float2(-1.0, 2.0)), cultmath_hash(cell + float2(0.0, 2.0)), cultmath_hash(cell + float2(1.0, 2.0)), cultmath_hash(cell + float2(2.0, 2.0)), local.x);
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return cultmath_catmullrom(y0, y1, y2, y3, local.y);
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}
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float cultmath_value_noise_texture(Texture2D<float> noise_texture, SamplerState noise_sampler, float2 uv, float scale)
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{
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return noise_texture.SampleLevel(noise_sampler, uv * scale, 0.0).r;
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}
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float cultmath_value_noise_texture_bicubic(Texture2D<float> noise_texture, SamplerState noise_sampler, float2 uv, float scale, float2 texel_size)
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{
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float2 position = uv * scale;
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float2 cell = floor(position);
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float2 local = cultmath_frac(position);
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float2 base_uv = cell / scale;
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float row0 = cultmath_catmullrom(
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noise_texture.SampleLevel(noise_sampler, base_uv + texel_size * float2(-1.0, -1.0), 0.0).r,
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noise_texture.SampleLevel(noise_sampler, base_uv + texel_size * float2(0.0, -1.0), 0.0).r,
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noise_texture.SampleLevel(noise_sampler, base_uv + texel_size * float2(1.0, -1.0), 0.0).r,
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noise_texture.SampleLevel(noise_sampler, base_uv + texel_size * float2(2.0, -1.0), 0.0).r,
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local.x);
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float row1 = cultmath_catmullrom(
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noise_texture.SampleLevel(noise_sampler, base_uv + texel_size * float2(-1.0, 0.0), 0.0).r,
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noise_texture.SampleLevel(noise_sampler, base_uv + texel_size * float2(0.0, 0.0), 0.0).r,
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noise_texture.SampleLevel(noise_sampler, base_uv + texel_size * float2(1.0, 0.0), 0.0).r,
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noise_texture.SampleLevel(noise_sampler, base_uv + texel_size * float2(2.0, 0.0), 0.0).r,
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local.x);
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float row2 = cultmath_catmullrom(
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noise_texture.SampleLevel(noise_sampler, base_uv + texel_size * float2(-1.0, 1.0), 0.0).r,
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noise_texture.SampleLevel(noise_sampler, base_uv + texel_size * float2(0.0, 1.0), 0.0).r,
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noise_texture.SampleLevel(noise_sampler, base_uv + texel_size * float2(1.0, 1.0), 0.0).r,
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noise_texture.SampleLevel(noise_sampler, base_uv + texel_size * float2(2.0, 1.0), 0.0).r,
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local.x);
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float row3 = cultmath_catmullrom(
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noise_texture.SampleLevel(noise_sampler, base_uv + texel_size * float2(-1.0, 2.0), 0.0).r,
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noise_texture.SampleLevel(noise_sampler, base_uv + texel_size * float2(0.0, 2.0), 0.0).r,
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noise_texture.SampleLevel(noise_sampler, base_uv + texel_size * float2(1.0, 2.0), 0.0).r,
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noise_texture.SampleLevel(noise_sampler, base_uv + texel_size * float2(2.0, 2.0), 0.0).r,
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local.x);
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return cultmath_catmullrom(row0, row1, row2, row3, local.y);
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}
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#endif
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