[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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[4890] | 15 | #include <vrmath/Color4f.h> |
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| 16 | |
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[3611] | 17 | #include "ParticleRenderer.h" |
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[2870] | 18 | #include "define.h" |
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[2831] | 19 | #include "Trace.h" |
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[1028] | 20 | |
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[3611] | 21 | using namespace nv; |
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[1478] | 22 | |
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[4889] | 23 | ParticleAdvectionShader *ParticleRenderer::_advectionShader = NULL; |
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[3611] | 24 | ParticleAdvectionShaderInstance shaderInstance; |
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[2837] | 25 | |
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[3611] | 26 | ParticleRenderer::ParticleRenderer(int w, int h) : |
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[2883] | 27 | _initPosTex(0), |
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| 28 | _data(NULL), |
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[4904] | 29 | _psysFrame(0U), |
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[2883] | 30 | _reborn(true), |
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| 31 | _flip(true), |
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[4904] | 32 | _maxLife(500U), |
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[1497] | 33 | _particleSize(1.2), |
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[2883] | 34 | _vertexArray(NULL), |
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| 35 | _scale(1, 1, 1), |
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| 36 | _origin(0, 0, 0), |
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| 37 | _activate(false), |
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| 38 | _slicePos(0.0), |
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[4904] | 39 | _sliceAxis(AXIS_Z), |
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[2883] | 40 | _color(0.2, 0.2, 1.0, 1.0), |
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| 41 | _psysWidth(w), |
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| 42 | _psysHeight(h) |
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[1028] | 43 | { |
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[2883] | 44 | _data = new Particle[w * h]; |
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| 45 | memset(_data, 0, sizeof(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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[1478] | 106 | if (_advectionShader == NULL) { |
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[4889] | 107 | _advectionShader = new ParticleAdvectionShader(); |
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[1478] | 108 | } |
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[1028] | 109 | } |
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| 110 | |
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[3611] | 111 | ParticleRenderer::~ParticleRenderer() |
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[1028] | 112 | { |
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[2883] | 113 | glDeleteTextures(1, &_initPosTex); |
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[1481] | 114 | |
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[2883] | 115 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, _psysFbo[0]); |
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| 116 | glDeleteTextures(1, _psysTex); |
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[1028] | 117 | |
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[2883] | 118 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, _psysFbo[1]); |
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| 119 | glDeleteTextures(1, _psysTex+1); |
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[1028] | 120 | |
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[2883] | 121 | glDeleteFramebuffersEXT(2, _psysFbo); |
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[1028] | 122 | |
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[2883] | 123 | delete _vertexArray; |
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| 124 | delete [] _data; |
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[1028] | 125 | } |
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| 126 | |
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[3611] | 127 | void |
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| 128 | ParticleRenderer::initializeDataArray() |
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[1028] | 129 | { |
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[2883] | 130 | size_t n = _psysWidth * _psysHeight * 4; |
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| 131 | memset(_data, 0, sizeof(float)* n); |
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[1370] | 132 | |
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| 133 | int index; |
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| 134 | bool particle; |
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[2883] | 135 | float *p = (float *)_data; |
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| 136 | for (int i = 0; i < _psysWidth; i++) { |
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| 137 | for (int j = 0; j < _psysHeight; j++) { |
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| 138 | index = i + _psysHeight*j; |
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| 139 | particle = (rand() % 256) > 150; |
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| 140 | if (particle) { |
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[1370] | 141 | //assign any location (x,y,z) in range [0,1] |
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[2883] | 142 | switch (_sliceAxis) { |
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| 143 | case 0: |
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[2921] | 144 | p[4*index] = _slicePos; |
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| 145 | p[4*index+1] = j/float(_psysHeight); |
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| 146 | p[4*index+2] = i/float(_psysWidth); |
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[2883] | 147 | break; |
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| 148 | case 1: |
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[2921] | 149 | p[4*index] = j/float(_psysHeight); |
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[2883] | 150 | p[4*index+1] = _slicePos; |
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[2921] | 151 | p[4*index+2] = i/float(_psysWidth); |
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[2883] | 152 | break; |
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| 153 | case 2: |
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[2921] | 154 | p[4*index] = j/float(_psysHeight); |
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| 155 | p[4*index+1] = i/float(_psysWidth); |
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[2883] | 156 | p[4*index+2] = _slicePos; |
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| 157 | break; |
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| 158 | default: |
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[2921] | 159 | p[4*index] = 0; |
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| 160 | p[4*index+1] = 0; |
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| 161 | p[4*index+2] = 0; |
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| 162 | p[4*index+3] = 0; |
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[2883] | 163 | } |
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| 164 | |
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| 165 | //shorter life span, quicker iterations |
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[2921] | 166 | p[4*index+3] = rand() / ((float) RAND_MAX) * 0.5 + 0.5f; |
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[1469] | 167 | } else { |
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[2921] | 168 | p[4*index] = 0; |
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| 169 | p[4*index+1] = 0; |
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| 170 | p[4*index+2] = 0; |
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| 171 | p[4*index+3] = 0; |
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[2883] | 172 | } |
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[1370] | 173 | } |
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| 174 | } |
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| 175 | } |
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| 176 | |
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[3611] | 177 | void |
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| 178 | ParticleRenderer::initialize() |
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[1370] | 179 | { |
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| 180 | initializeDataArray(); |
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| 181 | |
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[2884] | 182 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, _psysTex[0]); |
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[2883] | 183 | #ifdef HAVE_FLOAT_TEXTURES |
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[2884] | 184 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA32F_ARB, |
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[2883] | 185 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, (float*)_data); |
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[1028] | 186 | #else |
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[2884] | 187 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, |
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[2883] | 188 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, (float*)_data); |
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[1028] | 189 | #endif |
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[2884] | 190 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, 0); |
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[1028] | 191 | |
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[2883] | 192 | _flip = true; |
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| 193 | _reborn = false; |
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| 194 | |
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[2884] | 195 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, _initPosTex); |
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[2883] | 196 | #ifdef HAVE_FLOAT_TEXTURES |
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[2884] | 197 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA32F_ARB, |
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[2883] | 198 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, (float*)_data); |
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[1331] | 199 | #else |
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[2884] | 200 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, |
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[2883] | 201 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, (float*)_data); |
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[1331] | 202 | #endif |
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[2884] | 203 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, 0); |
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[1331] | 204 | |
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[3452] | 205 | TRACE("Leave"); |
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[1028] | 206 | } |
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| 207 | |
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[3611] | 208 | void |
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| 209 | ParticleRenderer::reset() |
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[1028] | 210 | { |
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[2884] | 211 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, _psysTex[0]); |
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[2883] | 212 | #ifdef HAVE_FLOAT_TEXTURES |
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[2884] | 213 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA32F_ARB, |
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[2883] | 214 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, (float*)_data); |
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[1028] | 215 | #else |
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[2884] | 216 | glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, |
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[2883] | 217 | _psysWidth, _psysHeight, 0, GL_RGBA, GL_FLOAT, (float*)_data); |
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[1028] | 218 | #endif |
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[2884] | 219 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, 0); |
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[2883] | 220 | _flip = true; |
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| 221 | _reborn = false; |
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[4904] | 222 | _psysFrame = 0U; |
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[1028] | 223 | } |
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| 224 | |
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[3611] | 225 | void |
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| 226 | ParticleRenderer::advect() |
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[1028] | 227 | { |
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[2883] | 228 | if (_reborn) |
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[1028] | 229 | reset(); |
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[2883] | 230 | |
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[2921] | 231 | glPushAttrib(GL_VIEWPORT_BIT | GL_ENABLE_BIT); |
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| 232 | |
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| 233 | int fboOrig; |
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| 234 | glGetIntegerv(GL_FRAMEBUFFER_BINDING_EXT, &fboOrig); |
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| 235 | |
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[1028] | 236 | glDisable(GL_BLEND); |
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| 237 | glDisable(GL_DEPTH_TEST); |
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[2837] | 238 | |
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[2921] | 239 | int fbo, tex; |
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[2883] | 240 | if (_flip) { |
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[2921] | 241 | fbo = 1; |
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| 242 | tex = 0; |
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| 243 | } else { |
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| 244 | fbo = 0; |
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| 245 | tex = 1; |
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| 246 | } |
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[2883] | 247 | |
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[2921] | 248 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, _psysFbo[fbo]); |
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| 249 | glEnable(GL_TEXTURE_RECTANGLE_ARB); |
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| 250 | glBindTexture(GL_TEXTURE_RECTANGLE_ARB, _psysTex[tex]); |
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[2883] | 251 | |
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[2921] | 252 | glClear(GL_COLOR_BUFFER_BIT); |
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[2883] | 253 | |
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[2921] | 254 | glViewport(0, 0, _psysWidth, _psysHeight); |
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| 255 | glMatrixMode(GL_PROJECTION); |
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| 256 | glPushMatrix(); |
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| 257 | glLoadIdentity(); |
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| 258 | //gluOrtho2D(0, _psysWidth, 0, _psysHeight); |
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| 259 | glOrtho(0, _psysWidth, 0, _psysHeight, -10.0f, 10.0f); |
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| 260 | glMatrixMode(GL_MODELVIEW); |
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| 261 | glPushMatrix(); |
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| 262 | glLoadIdentity(); |
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[2883] | 263 | |
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[2921] | 264 | _advectionShader->bind(_psysTex[tex], _initPosTex); |
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[2883] | 265 | |
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[2921] | 266 | draw_quad(_psysWidth, _psysHeight, _psysWidth, _psysHeight); |
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[2883] | 267 | |
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[2921] | 268 | _advectionShader->unbind(); |
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[2883] | 269 | |
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[2921] | 270 | glMatrixMode(GL_PROJECTION); |
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| 271 | glPopMatrix(); |
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[2883] | 272 | |
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[2921] | 273 | glMatrixMode(GL_MODELVIEW); |
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| 274 | glPopMatrix(); |
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[2883] | 275 | |
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[2921] | 276 | glDisable(GL_TEXTURE_RECTANGLE_ARB); |
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[2837] | 277 | |
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[2883] | 278 | updateVertexBuffer(); |
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[2837] | 279 | |
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[2883] | 280 | _flip = (!_flip); |
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[2837] | 281 | |
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[2883] | 282 | _psysFrame++; |
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| 283 | if (_psysFrame == _maxLife) { |
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[4904] | 284 | _psysFrame = 0U; |
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[2953] | 285 | // _reborn = true; |
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[1362] | 286 | } |
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[2921] | 287 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fboOrig); |
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| 288 | |
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| 289 | glPopAttrib(); |
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[1028] | 290 | } |
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| 291 | |
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[2883] | 292 | void |
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[3611] | 293 | ParticleRenderer::updateVertexBuffer() |
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[1028] | 294 | { |
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[2921] | 295 | _vertexArray->read(_psysWidth, _psysHeight); |
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[1028] | 296 | |
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[2921] | 297 | //_vertexArray->loadData(vert); //does not work?? |
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[1028] | 298 | //assert(glGetError()==0); |
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| 299 | } |
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| 300 | |
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[3611] | 301 | void |
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| 302 | ParticleRenderer::render() |
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[1028] | 303 | { |
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[2921] | 304 | glPushAttrib(GL_ENABLE_BIT); |
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[1028] | 305 | glDisable(GL_TEXTURE_2D); |
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| 306 | glDisable(GL_BLEND); |
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| 307 | glEnable(GL_DEPTH_TEST); |
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| 308 | |
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| 309 | glEnable(GL_COLOR_MATERIAL); |
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| 310 | |
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[2921] | 311 | glMatrixMode(GL_MODELVIEW); |
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[1028] | 312 | glPushMatrix(); |
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| 313 | |
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[2883] | 314 | glTranslatef(_origin.x, _origin.y, _origin.z); |
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| 315 | glScaled(_scale.x, _scale.y, _scale.z); |
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[1028] | 316 | |
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[1497] | 317 | glPointSize(_particleSize); |
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[1370] | 318 | glColor4f(_color.x, _color.y, _color.z, _color.w); |
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[2956] | 319 | |
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[1028] | 320 | glEnableClientState(GL_VERTEX_ARRAY); |
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[2921] | 321 | _vertexArray->setPointer(0); |
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[2883] | 322 | glDrawArrays(GL_POINTS, 0, _psysWidth * _psysHeight); |
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[1028] | 323 | glDisableClientState(GL_VERTEX_ARRAY); |
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| 324 | |
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| 325 | glPopMatrix(); |
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[2921] | 326 | glPopAttrib(); |
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[1028] | 327 | } |
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| 328 | |
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[1362] | 329 | void |
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[3611] | 330 | ParticleRenderer::setVectorField(unsigned int texID, const vrmath::Vector3f& origin, |
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| 331 | float scaleX, float scaleY, float scaleZ, |
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| 332 | float max) |
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[1028] | 333 | { |
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[2883] | 334 | _origin = origin; |
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| 335 | _scale.set(scaleX, scaleY, scaleZ); |
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| 336 | _advectionShader->setScale(_scale); |
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[1028] | 337 | _advectionShader->setVelocityVolume(texID, max); |
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| 338 | } |
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[1370] | 339 | |
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[3611] | 340 | void |
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[4904] | 341 | ParticleRenderer::setSliceAxis(FlowSliceAxis axis) |
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[1370] | 342 | { |
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[2883] | 343 | _sliceAxis = axis; |
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[2835] | 344 | initializeDataArray(); |
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[1370] | 345 | } |
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| 346 | |
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[3611] | 347 | void |
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[4904] | 348 | ParticleRenderer::setSlicePosition(float pos) |
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[1370] | 349 | { |
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[2883] | 350 | _slicePos = pos; |
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[2835] | 351 | initializeDataArray(); |
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[1370] | 352 | } |
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