source: nanovis/trunk/shaders/particlevp.cg @ 4880

Last change on this file since 4880 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: 2.4 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#include "particle_common.cg"
10
11void vpmain(in float4 posin : POSITION,
12            in float4 colin : COLOR0,
13            in float4 attr : TEXCOORD0,
14            inout float pointSize : PSIZE,
15            out float4 posout : POSITION,
16            out float4 colout : COLOR0,
17            out float2 center : TEXCOORD2,
18            out float4 rotation : TEXCOORD3,
19            out float skip : TEXCOORD4,
20            out float mag : TEXCOORD5,
21            out float zValue : TEXCOORD6,
22            uniform sampler3D vfield,
23            uniform float currentTime,
24            uniform float tanHalfFOV,
25            uniform float4x4 modelview,
26            uniform float4x4 projection,
27            uniform float4x4 mvp)
28{
29    float4 vec;
30    vec.xyz = posin.xyz;
31    vec.w = 1.0;
32
33    float timeOfBirth = attr.x;
34    float lifeTime = attr.y;
35    //float index = attr.w;
36
37    // length
38    // the scale of from bottom to top
39    float4 v = tex3D(vfield, vec.xyz);
40    float3 velocity = v.yzw * 2 - float3(1, 1, 1);
41    mag = v.x;
42
43    // bottom to top
44    // scale
45    center.y = ((((int) (length(velocity.xyz) * 511)) / SUBIMAGE_SIZE_Y) * SUBIMAGE_SIZE_Y) / 512.0;
46    //center.y = ((((int) (511)) / SUBIMAGE_SIZE_Y) * SUBIMAGE_SIZE_Y) / 512.0;
47
48    velocity = mul(modelview, float4(velocity.x, velocity.y, velocity.z, 0.0)).xyz;
49    if (length(velocity) != 0.0)
50        velocity = normalize(velocity);
51
52    float a = (asin(velocity.z) / 3.141592 + 1) * 0.5;
53    center.x = ((((int) (a * 511)) / SUBIMAGE_SIZE_X) * SUBIMAGE_SIZE_X) / 512.0;
54
55    if ((abs(velocity.x) == 0.0) && (abs(velocity.y) == 0.0)) {
56        rotation.x = 1;
57        rotation.y = 0;
58        rotation.z = 0;
59        rotation.w = 1;
60    } else {
61        float2 xy = normalize(velocity.xy);
62        rotation.x = xy.x * 0.8;
63        rotation.y = -xy.y * 0.8;
64        rotation.z = xy.y * 0.8;
65        rotation.w = xy.x * 0.8;
66    }
67
68    float4 posEye =  mul(modelview, posin);
69#ifndef USE_J_WIRE
70    pointSize = tanHalfFOV / -posEye.z / 5;
71#else
72    pointSize = tanHalfFOV / -posEye.z / 10;
73#endif
74    //pointSize = 10 / -posEye.z;
75    zValue = posEye.z;
76    posout = mul(mvp, vec);
77
78    if ((currentTime > timeOfBirth) && (currentTime < (timeOfBirth + lifeTime))) skip = 0.0;
79    else skip = 1.0;
80
81    colout = colin;
82}
83
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