source: nanovis/trunk/shaders/update_pos.cg @ 4587

Last change on this file since 4587 was 3630, checked in by ldelgass, 7 years ago

Nanovis refactoring to fix problems with scaling and multiple results.
Do rendering in world space to properly place and scale multiple data sets.
Also fix flows to reduce resets of animations. More work toward removing
Cg dependency. Fix panning to convert viewport coords to world coords.

File size: 1.3 KB
Line 
1/* -*- mode: c++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
2/*
3 * Copyright (c) 2004-2013  HUBzero Foundation, LLC
4 *
5 * Authors:
6 *   Wei Qiao <qiaow@purdue.edu>
7 */
8
9// update positions based on velocity
10
11#include "common.cg"
12
13float4 main(in float2 uv : TEXCOORD0,
14            uniform samplerRECT pos_tex,
15            uniform samplerRECT init_pos_tex,
16            uniform sampler3D vel_tex,
17            uniform float timestep,
18            uniform float max,
19            uniform float3 scale) : COLOR
20{
21    float4 ret;
22    // get previous position
23    float4 pos = texRECT(pos_tex, uv);
24    float time = pos.w;
25
26    //reconstruct negative value
27    if (max > 0) {
28#ifdef EXPIRE
29        time -= timestep;
30
31        // Lifetime ended?
32        if (time < 0) {
33            return texRECT(init_pos_tex, uv);
34        }
35#endif
36        float4 vel = float4(tex3D(vel_tex, pos.xyz).yzw, 0.0) * 2.0 - float4(1.0, 1.0, 1.0, 0.0);
37        vel = vel * max;
38        //vel *= float4(scale, 1);
39        ret = pos + (vel * timestep);
40    } else {
41        ret = pos;
42    }
43
44    //not drawing if the particle is out of bound
45    if (ret.x < 0 || ret.x > 1 || ret.y < 0 || ret.y > 1 || ret.z < 0 || ret.z > 1) {
46        ret = texRECT(init_pos_tex, uv);
47    } else {
48        ret.w = time;
49    }
50
51    return ret;
52}
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