[2798] | 1 | /* -*- mode: c++; c-basic-offset: 4; indent-tabs-mode: nil -*- */ |
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[3611] | 2 | /* |
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[3502] | 3 | * Copyright (c) 2004-2013 HUBzero Foundation, LLC |
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[1028] | 4 | * |
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[3611] | 5 | * Authors: |
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| 6 | * Wei Qiao <qiaow@purdue.edu> |
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[1028] | 7 | */ |
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| 8 | |
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| 9 | #include <assert.h> |
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| 10 | #include <string.h> |
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[2831] | 11 | #include <stdlib.h> |
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[1028] | 12 | |
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[2958] | 13 | #include <GL/glew.h> |
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| 14 | |
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[3630] | 15 | #include <vrmath/Vector3f.h> |
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[3627] | 16 | #include <vrmath/Color4f.h> |
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| 17 | |
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[3611] | 18 | #include "ParticleRenderer.h" |
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[5587] | 19 | #include "ParticleAdvectionShader.h" |
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[3630] | 20 | #include "Volume.h" |
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[2870] | 21 | #include "define.h" |
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[2831] | 22 | #include "Trace.h" |
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[1028] | 23 | |
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[3630] | 24 | using namespace vrmath; |
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[3611] | 25 | using namespace nv; |
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[1478] | 26 | |
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[3611] | 27 | ParticleRenderer::ParticleRenderer(int w, int h) : |
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[2883] | 28 | _initPosTex(0), |
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| 29 | _data(NULL), |
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| 30 | _psysFrame(0), |
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| 31 | _reborn(true), |
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| 32 | _flip(true), |
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| 33 | _maxLife(500), |
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[1497] | 34 | _particleSize(1.2), |
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[2883] | 35 | _vertexArray(NULL), |
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| 36 | _scale(1, 1, 1), |
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| 37 | _origin(0, 0, 0), |
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| 38 | _activate(false), |
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| 39 | _slicePos(0.0), |
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[3630] | 40 | _sliceAxis(AXIS_Z), |
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[2883] | 41 | _color(0.2, 0.2, 1.0, 1.0), |
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| 42 | _psysWidth(w), |
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| 43 | _psysHeight(h) |
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[1028] | 44 | { |
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[2883] | 45 | _data = new Particle[w * h]; |
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[1028] | 46 | |
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[2883] | 47 | _vertexArray = new RenderVertexArray(_psysWidth * _psysHeight, 3, GL_FLOAT); |
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[1370] | 48 | |
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[1429] | 49 | assert(CheckGL(AT)); |
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[1028] | 50 | |
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[2883] | 51 | glGenFramebuffersEXT(2, _psysFbo); |
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| 52 | glGenTextures(2, _psysTex); |
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[1028] | 53 | |
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[2921] | 54 | int fboOrig; |
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| 55 | glGetIntegerv(GL_FRAMEBUFFER_BINDING_EXT, &fboOrig); |
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| 56 | |
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[2883] | 57 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, _psysFbo[0]); |
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[1028] | 58 | |
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[2884] | 59 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, _psysTex[0]); |
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| 60 | glTexParameterf(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
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| 61 | glTexParameterf(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
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[1028] | 62 | |
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[2883] | 63 | #ifdef HAVE_FLOAT_TEXTURES |
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[2884] | 64 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA32F_ARB, |
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[2883] | 65 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, NULL); |
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[1028] | 66 | #else |
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[2884] | 67 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, |
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[2883] | 68 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, NULL); |
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[1028] | 69 | #endif |
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[1362] | 70 | glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, |
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[2884] | 71 | GL_TEXTURE_RECTANGLE_ARB, _psysTex[0], 0); |
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[1028] | 72 | |
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[2956] | 73 | CHECK_FRAMEBUFFER_STATUS(); |
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[1331] | 74 | |
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[2883] | 75 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, _psysFbo[1]); |
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[1028] | 76 | |
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[2884] | 77 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, _psysTex[1]); |
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| 78 | glTexParameterf(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
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| 79 | glTexParameterf(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
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[2883] | 80 | #ifdef HAVE_FLOAT_TEXTURES |
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[2884] | 81 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA32F_ARB, |
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[2883] | 82 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, NULL); |
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[1028] | 83 | #else |
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[2884] | 84 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, |
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[2883] | 85 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, NULL); |
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[1028] | 86 | #endif |
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[1362] | 87 | glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, |
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[2884] | 88 | GL_TEXTURE_RECTANGLE_ARB, _psysTex[1], 0); |
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[1331] | 89 | |
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[2956] | 90 | CHECK_FRAMEBUFFER_STATUS(); |
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| 91 | |
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[2921] | 92 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fboOrig); |
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[1028] | 93 | |
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[2883] | 94 | glGenTextures(1, &_initPosTex); |
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[2884] | 95 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, _initPosTex); |
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| 96 | glTexParameterf(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
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| 97 | glTexParameterf(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
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[2883] | 98 | #ifdef HAVE_FLOAT_TEXTURES |
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[2884] | 99 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA32F_ARB, |
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[2883] | 100 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, NULL); |
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[1331] | 101 | #else |
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[2884] | 102 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, |
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[2883] | 103 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, NULL); |
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[1331] | 104 | #endif |
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| 105 | |
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[3630] | 106 | _advectionShader = new ParticleAdvectionShader(); |
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[1028] | 107 | } |
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| 108 | |
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[3611] | 109 | ParticleRenderer::~ParticleRenderer() |
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[1028] | 110 | { |
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[2883] | 111 | glDeleteTextures(1, &_initPosTex); |
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[1481] | 112 | |
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[2883] | 113 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, _psysFbo[0]); |
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| 114 | glDeleteTextures(1, _psysTex); |
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[1028] | 115 | |
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[2883] | 116 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, _psysFbo[1]); |
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| 117 | glDeleteTextures(1, _psysTex+1); |
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[1028] | 118 | |
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[2883] | 119 | glDeleteFramebuffersEXT(2, _psysFbo); |
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[1028] | 120 | |
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[3630] | 121 | delete _advectionShader; |
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[2883] | 122 | delete _vertexArray; |
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| 123 | delete [] _data; |
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[1028] | 124 | } |
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| 125 | |
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[3611] | 126 | void |
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| 127 | ParticleRenderer::initializeDataArray() |
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[1028] | 128 | { |
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[3630] | 129 | TRACE("Enter axis: %d pos: %g", _sliceAxis, _slicePos); |
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[1370] | 130 | |
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[3630] | 131 | memset(_data, 0, sizeof(Particle) * _psysWidth * _psysHeight); |
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[5404] | 132 | |
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[3630] | 133 | bool hasParticle; |
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[2883] | 134 | for (int i = 0; i < _psysWidth; i++) { |
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| 135 | for (int j = 0; j < _psysHeight; j++) { |
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[3630] | 136 | Particle *p = &_data[i + _psysHeight*j]; |
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| 137 | hasParticle = (rand() % 256) > 150; |
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[5404] | 138 | if (hasParticle) { |
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[1370] | 139 | //assign any location (x,y,z) in range [0,1] |
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[2883] | 140 | switch (_sliceAxis) { |
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[3630] | 141 | case AXIS_X: |
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| 142 | p->x = _slicePos; |
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| 143 | p->y = j/float(_psysHeight); |
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| 144 | p->z = i/float(_psysWidth); |
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[2883] | 145 | break; |
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[3630] | 146 | case AXIS_Y: |
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| 147 | p->x = j/float(_psysHeight); |
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| 148 | p->y = _slicePos; |
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| 149 | p->z = i/float(_psysWidth); |
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[2883] | 150 | break; |
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[3630] | 151 | case AXIS_Z: |
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| 152 | p->x = j/float(_psysHeight); |
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| 153 | p->y = i/float(_psysWidth); |
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| 154 | p->z = _slicePos; |
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[2883] | 155 | break; |
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| 156 | default: |
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[3630] | 157 | ERROR("Unknown axis"); |
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[2883] | 158 | } |
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| 159 | //shorter life span, quicker iterations |
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[5483] | 160 | p->life = rand() / ((float) RAND_MAX) * 0.5 + 0.5f; |
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[2883] | 161 | } |
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[1370] | 162 | } |
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| 163 | } |
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| 164 | } |
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| 165 | |
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[3611] | 166 | void |
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| 167 | ParticleRenderer::initialize() |
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[1370] | 168 | { |
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[3630] | 169 | TRACE("Enter"); |
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| 170 | |
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[1370] | 171 | initializeDataArray(); |
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| 172 | |
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[2884] | 173 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, _psysTex[0]); |
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[2883] | 174 | #ifdef HAVE_FLOAT_TEXTURES |
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[2884] | 175 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA32F_ARB, |
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[2883] | 176 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, (float*)_data); |
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[1028] | 177 | #else |
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[2884] | 178 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, |
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[2883] | 179 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, (float*)_data); |
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[1028] | 180 | #endif |
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[2884] | 181 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, 0); |
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[1028] | 182 | |
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[2883] | 183 | _flip = true; |
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| 184 | _reborn = false; |
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[3630] | 185 | _psysFrame = 0; |
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[2883] | 186 | |
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[2884] | 187 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, _initPosTex); |
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[2883] | 188 | #ifdef HAVE_FLOAT_TEXTURES |
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[2884] | 189 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA32F_ARB, |
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[2883] | 190 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, (float*)_data); |
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[1331] | 191 | #else |
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[2884] | 192 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, |
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[2883] | 193 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, (float*)_data); |
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[1331] | 194 | #endif |
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[2884] | 195 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, 0); |
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[1331] | 196 | |
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[3452] | 197 | TRACE("Leave"); |
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[1028] | 198 | } |
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| 199 | |
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[3611] | 200 | void |
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| 201 | ParticleRenderer::reset() |
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[1028] | 202 | { |
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[2884] | 203 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, _psysTex[0]); |
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[2883] | 204 | #ifdef HAVE_FLOAT_TEXTURES |
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[2884] | 205 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA32F_ARB, |
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[2883] | 206 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, (float*)_data); |
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[1028] | 207 | #else |
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[2884] | 208 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, |
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[2883] | 209 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, (float*)_data); |
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[1028] | 210 | #endif |
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[2884] | 211 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, 0); |
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[2883] | 212 | _flip = true; |
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| 213 | _reborn = false; |
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| 214 | _psysFrame = 0; |
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[1028] | 215 | } |
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| 216 | |
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[3611] | 217 | void |
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| 218 | ParticleRenderer::advect() |
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[1028] | 219 | { |
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[3630] | 220 | TRACE("Enter"); |
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| 221 | |
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[2883] | 222 | if (_reborn) |
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[1028] | 223 | reset(); |
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[2883] | 224 | |
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[2921] | 225 | glPushAttrib(GL_VIEWPORT_BIT | GL_ENABLE_BIT); |
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| 226 | |
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| 227 | int fboOrig; |
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| 228 | glGetIntegerv(GL_FRAMEBUFFER_BINDING_EXT, &fboOrig); |
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| 229 | |
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[1028] | 230 | glDisable(GL_BLEND); |
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| 231 | glDisable(GL_DEPTH_TEST); |
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[2837] | 232 | |
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[2921] | 233 | int fbo, tex; |
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[2883] | 234 | if (_flip) { |
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[2921] | 235 | fbo = 1; |
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| 236 | tex = 0; |
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| 237 | } else { |
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| 238 | fbo = 0; |
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| 239 | tex = 1; |
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| 240 | } |
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[2883] | 241 | |
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[2921] | 242 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, _psysFbo[fbo]); |
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| 243 | glEnable(GL_TEXTURE_RECTANGLE_ARB); |
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| 244 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, _psysTex[tex]); |
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[2883] | 245 | |
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[2921] | 246 | glClear(GL_COLOR_BUFFER_BIT); |
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[2883] | 247 | |
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[2921] | 248 | glViewport(0, 0, _psysWidth, _psysHeight); |
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| 249 | glMatrixMode(GL_PROJECTION); |
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| 250 | glPushMatrix(); |
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| 251 | glLoadIdentity(); |
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| 252 | glOrtho(0, _psysWidth, 0, _psysHeight, -10.0f, 10.0f); |
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| 253 | glMatrixMode(GL_MODELVIEW); |
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| 254 | glPushMatrix(); |
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| 255 | glLoadIdentity(); |
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[2883] | 256 | |
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[3630] | 257 | _advectionShader->bind(_psysTex[tex], _initPosTex, _psysFrame == 0); |
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[2883] | 258 | |
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[2921] | 259 | draw_quad(_psysWidth, _psysHeight, _psysWidth, _psysHeight); |
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[2883] | 260 | |
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[2921] | 261 | _advectionShader->unbind(); |
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[2883] | 262 | |
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[2921] | 263 | glMatrixMode(GL_PROJECTION); |
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| 264 | glPopMatrix(); |
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[2883] | 265 | |
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[2921] | 266 | glMatrixMode(GL_MODELVIEW); |
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| 267 | glPopMatrix(); |
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[2883] | 268 | |
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[2921] | 269 | glDisable(GL_TEXTURE_RECTANGLE_ARB); |
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[2837] | 270 | |
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[2883] | 271 | updateVertexBuffer(); |
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[2837] | 272 | |
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[2883] | 273 | _flip = (!_flip); |
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[2837] | 274 | |
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[2883] | 275 | _psysFrame++; |
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| 276 | if (_psysFrame == _maxLife) { |
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[3630] | 277 | //_psysFrame = 0; |
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| 278 | //_reborn = true; |
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[1362] | 279 | } |
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[2921] | 280 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fboOrig); |
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| 281 | |
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| 282 | glPopAttrib(); |
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[1028] | 283 | } |
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| 284 | |
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[2883] | 285 | void |
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[3611] | 286 | ParticleRenderer::updateVertexBuffer() |
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[1028] | 287 | { |
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[2921] | 288 | _vertexArray->read(_psysWidth, _psysHeight); |
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[1028] | 289 | } |
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| 290 | |
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[3611] | 291 | void |
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| 292 | ParticleRenderer::render() |
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[1028] | 293 | { |
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[3630] | 294 | if (_psysFrame == 0) { |
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| 295 | TRACE("Initializing vertex array"); |
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| 296 | advect(); |
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| 297 | } |
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| 298 | |
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[2921] | 299 | glPushAttrib(GL_ENABLE_BIT); |
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[1028] | 300 | glDisable(GL_TEXTURE_2D); |
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| 301 | glDisable(GL_BLEND); |
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| 302 | glEnable(GL_DEPTH_TEST); |
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| 303 | |
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| 304 | glEnable(GL_COLOR_MATERIAL); |
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| 305 | |
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[2921] | 306 | glMatrixMode(GL_MODELVIEW); |
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[1028] | 307 | glPushMatrix(); |
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| 308 | |
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[2883] | 309 | glTranslatef(_origin.x, _origin.y, _origin.z); |
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| 310 | glScaled(_scale.x, _scale.y, _scale.z); |
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[1028] | 311 | |
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[1497] | 312 | glPointSize(_particleSize); |
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[1370] | 313 | glColor4f(_color.x, _color.y, _color.z, _color.w); |
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[2956] | 314 | |
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[1028] | 315 | glEnableClientState(GL_VERTEX_ARRAY); |
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[2921] | 316 | _vertexArray->setPointer(0); |
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[2883] | 317 | glDrawArrays(GL_POINTS, 0, _psysWidth * _psysHeight); |
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[1028] | 318 | glDisableClientState(GL_VERTEX_ARRAY); |
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| 319 | |
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| 320 | glPopMatrix(); |
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[2921] | 321 | glPopAttrib(); |
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[1028] | 322 | } |
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| 323 | |
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[1362] | 324 | void |
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[3630] | 325 | ParticleRenderer::setVectorField(Volume *volume) |
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[1028] | 326 | { |
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[3630] | 327 | Vector3f bmin, bmax; |
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| 328 | volume->getBounds(bmin, bmax); |
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| 329 | _origin = bmin; |
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| 330 | Vector3f scale(bmax.x-bmin.x, bmax.y-bmin.y, bmax.z-bmin.z); |
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| 331 | _scale.set(scale.x, scale.y, scale.z); |
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[2883] | 332 | _advectionShader->setScale(_scale); |
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[3630] | 333 | _advectionShader->setVelocityVolume(volume->textureID(), |
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| 334 | volume->wAxis.max()); |
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[1028] | 335 | } |
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[1370] | 336 | |
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[3611] | 337 | void |
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[3631] | 338 | ParticleRenderer::setSliceAxis(FlowSliceAxis axis) |
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[1370] | 339 | { |
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[3630] | 340 | if (axis != _sliceAxis) { |
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| 341 | _sliceAxis = axis; |
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| 342 | initialize(); |
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| 343 | } |
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[1370] | 344 | } |
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| 345 | |
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[3611] | 346 | void |
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[3631] | 347 | ParticleRenderer::setSlicePosition(float pos) |
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[1370] | 348 | { |
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[3630] | 349 | if (pos != _slicePos) { |
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| 350 | _slicePos = pos; |
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| 351 | initialize(); |
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| 352 | } |
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[1370] | 353 | } |
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