1 | /* -*- mode: c++; c-basic-offset: 4; indent-tabs-mode: nil -*- */ |
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2 | // Copyright (c) 2004-2005 Lutz Latta |
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3 | // |
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4 | // Permission is hereby granted, free of charge, to any person obtaining |
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5 | // a copy of this software and associated documentation files (the "Software"), |
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6 | // to deal in the Software without restriction, including without limitation |
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7 | // the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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8 | // and/or sell copies of the Software, and to permit persons to whom the |
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9 | // Software is furnished to do so, subject to the following conditions: |
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10 | // |
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11 | // The above copyright notice and this permission notice shall be included |
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12 | // in all copies or substantial portions of the Software. |
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13 | // |
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14 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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15 | // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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16 | // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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17 | // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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18 | // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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19 | // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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20 | // DEALINGS IN THE SOFTWARE. |
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21 | |
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22 | // Velocity change operations. |
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23 | //#include "velocityOps.cg" |
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24 | |
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25 | // Uniform parameters influencing velocity. |
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26 | uniform float3 _SphereCenter; |
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27 | uniform samplerRECT _TerrainTexture : register(s2); |
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28 | uniform samplerRECT _FlowFieldTexture : register(s3); |
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29 | uniform float3 _LocalAttractorPosition[4]; |
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30 | |
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31 | float3 advanceVelocity(float3 _Velocity, float3 _Position, float _TimeStep) |
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32 | { |
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33 | float3 gravity = float3(0, -.01, 0); |
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34 | |
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35 | float3 acceleration = gravity; |
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36 | |
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37 | //acceleration += |
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38 | // localAttractor(_Position, |
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39 | // getClosestPointOnLine(_LocalAttractorPosition[0], |
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40 | // _LocalAttractorPosition[1], _Position), 0.05, 0.2); |
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41 | //acceleration += localAttractor(_Position, _LocalAttractorPosition[0], 0.02, 0.4); |
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42 | //acceleration += localAttractor(_Position, _LocalAttractorPosition[1], 0.02, 0.02); |
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43 | //acceleration += localRepulsor(_Position, _LocalAttractorPosition[2], 0.02, 0.1); |
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44 | //acceleration += localRepulsor(_Position, _LocalAttractorPosition[3], 0.02, 0.1); |
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45 | //acceleration += flowFieldVector(_Position, _FlowFieldTexture, float2(512, 512), |
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46 | // float3(4, 4, 4), float3(256, 0, 256), 0.01); |
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47 | |
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48 | float3 velocity = _Velocity + _TimeStep * acceleration; |
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49 | |
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50 | //velocity = lerp(velocity, flowFieldVector(_Position, _FlowFieldTexture, float2(512, 512), |
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51 | // float3(4, 4, 4), float3(256, 0, 256), 1), 0.2); |
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52 | //velocity = length(velocity) * normalize(flowFieldVector(_Position, _FlowFieldTexture, float2(512, 512), |
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53 | // float3(4, 4, 4), float3(256, 0, 256), 1)); |
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54 | |
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55 | //spiral(velocity, _TimeStep, normalize(_LocalAttractorPosition[0] - _LocalAttractorPosition[1]), .3); |
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56 | |
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57 | //dampen(velocity, 1.1); |
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58 | //undampen(velocity, 1.01); |
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59 | |
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60 | floorConstraint(velocity, _Position, 0, 0.4, 0.1, 0.01); |
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61 | sphereConstraint(velocity, _Position, _SphereCenter, 1, 0.3, 0.7, 0.01); |
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62 | //terrainConstraint(velocity, _Position, _TerrainTexture, float2(128, 128), |
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63 | // float3(4, 4, 4), float3(64, 0, 64), 0.02, 0.7, 0.01); |
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64 | |
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65 | return velocity; |
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66 | } |
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67 | |
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68 | float4 main(float2 _TexCoord : TEXCOORD0, |
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69 | uniform samplerRECT _VelocityTexture : register(s0), |
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70 | uniform samplerRECT _PositionTexture : register(s1), |
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71 | uniform float _TimeStep) : COLOR |
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72 | { |
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73 | float3 velocity = (float3)texRECT(_VelocityTexture, _TexCoord); |
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74 | float3 position = (float3)texRECT(_PositionTexture, _TexCoord); |
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75 | |
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76 | return float4(advanceVelocity(velocity, position, _TimeStep), 0); |
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77 | } |
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78 | |
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79 | float4 mainInitialization(float3 _VelocityInit : TEXCOORD0, |
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80 | float3 _PositionInit : TEXCOORD1, |
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81 | float _TimeStep : TEXCOORD2) : COLOR |
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82 | { |
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83 | return float4(advanceVelocity(_VelocityInit, _PositionInit, _TimeStep), 0); |
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84 | } |
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