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| 1 | - | // Source |
| 1 | + | |
| 2 | - | // http://www.gamedev.net/topic/592001-random-number-generation-based-on-time-in-hlsl/ |
| 2 | + | |
| 3 | #pragma kernel CSMain | |
| 4 | ||
| 5 | RWTexture2D<float4> Result; | |
| 6 | ||
| 7 | RWStructuredBuffer<float3> posBuffer : register(u0); | |
| 8 | RWStructuredBuffer<float3> colBuffer : register(u1); | |
| 9 | RWStructuredBuffer<float3> tarBuffer : register(u2); | |
| 10 | ||
| 11 | float Time; | |
| 12 | float4 CoreLoc; | |
| 13 | ||
| 14 | float rand_1_05(in float2 uv) | |
| 15 | {
| |
| 16 | float2 noise = (frac(sin(dot(uv ,float2(12.9898,78.233)*2.0)) * 43758.5453)); | |
| 17 | return abs(noise.x + noise.y) * 0.5; | |
| 18 | } | |
| 19 | ||
| 20 | float randomSpread(float2 seed) | |
| 21 | {
| |
| 22 | float part1 = rand_1_05(seed); | |
| 23 | float part2 = 1; | |
| 24 | ||
| 25 | if (part1 < 0.5) | |
| 26 | {
| |
| 27 | part2 = 1; | |
| 28 | } | |
| 29 | else{
| |
| 30 | part2 = -1; | |
| 31 | } | |
| 32 | ||
| 33 | return part2; | |
| 34 | } | |
| 35 | ||
| 36 | ||
| 37 | float3 ranWithinSphere(float2 seed) | |
| 38 | {
| |
| 39 | float3 temp = float3(0,0,0); | |
| 40 | ||
| 41 | temp.x = randomSpread(seed); | |
| 42 | temp.y = randomSpread(seed); | |
| 43 | temp.z = randomSpread(seed); | |
| 44 | ||
| 45 | return temp; | |
| 46 | } | |
| 47 | ||
| 48 | float distance(float3 point1, float3 point2) | |
| 49 | {
| |
| 50 | float x = (point1.x - point2.x) * (point1.x - point2.x); | |
| 51 | float y = (point1.y - point2.y) * (point1.x - point2.y); | |
| 52 | float z = (point1.z - point2.z) * (point1.x - point2.z); | |
| 53 | ||
| 54 | return sqrt(x + y + z); | |
| 55 | } | |
| 56 | ||
| 57 | [numthreads(10,1,1)] | |
| 58 | void CSMain (uint3 id : SV_DispatchThreadID) | |
| 59 | {
| |
| 60 | float2 seed = float2(id.x * Time, Time); | |
| 61 | ||
| 62 | ||
| 63 | colBuffer[id.x].x = cos(Time) * sin(Time); | |
| 64 | colBuffer[id.x].y = sin(Time); | |
| 65 | ||
| 66 | tarBuffer[id.x].x = CoreLoc.x + ((cos(Time * id.x) * sin(Time))) * 4; | |
| 67 | tarBuffer[id.x].y = CoreLoc.y + ((sin(Time * id.x) * cos(Time))) * 7; | |
| 68 | tarBuffer[id.x].z = CoreLoc.z + ((cos(Time * id.x) * sin(Time))) * 12; | |
| 69 | ||
| 70 | ||
| 71 | // Work your way towards the target | |
| 72 | float changeX = tarBuffer[id.x].x - posBuffer[id.x].x; | |
| 73 | float changeY = tarBuffer[id.x].y - posBuffer[id.x].y; | |
| 74 | float changeZ = tarBuffer[id.x].z - posBuffer[id.x].z; | |
| 75 | ||
| 76 | ||
| 77 | posBuffer[id.x].x += (changeX / 40); | |
| 78 | posBuffer[id.x].y += (changeY / 40); | |
| 79 | posBuffer[id.x].z += (changeZ / 40); | |
| 80 | ||
| 81 | } |
