[396] | 1 | /* |
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| 2 | * ---------------------------------------------------------------------- |
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| 3 | * Lic.h: line integral convolution class |
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| 4 | * |
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| 5 | * ====================================================================== |
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| 6 | * AUTHOR: Wei Qiao <qiaow@purdue.edu> |
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| 7 | * Purdue Rendering and Perceptualization Lab (PURPL) |
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| 8 | * |
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| 9 | * Copyright (c) 2004-2006 Purdue Research Foundation |
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| 10 | * |
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| 11 | * See the file "license.terms" for information on usage and |
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| 12 | * redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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| 13 | * ====================================================================== |
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| 14 | */ |
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| 15 | |
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| 16 | |
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[397] | 17 | #include <stdlib.h> |
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| 18 | #include <math.h> |
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| 19 | #include <assert.h> |
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[396] | 20 | |
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[755] | 21 | #include <R2/R2FilePath.h> |
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[396] | 22 | #include "Lic.h" |
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| 23 | |
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[397] | 24 | Lic::Lic(int _size, int _width, int _height, float _offset, |
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| 25 | CGcontext _context, NVISid _vector_field, |
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| 26 | float scalex, float scaley, float scalez): |
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[401] | 27 | Renderable(Vector3(0.,0.,0.)), |
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[396] | 28 | size(_size), |
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[397] | 29 | offset(_offset), |
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| 30 | m_g_context(_context), |
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[401] | 31 | width(_width), |
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| 32 | height(_height), |
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[397] | 33 | iframe(0), |
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| 34 | Npat(64), |
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| 35 | alpha(0.12*255), |
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| 36 | tmax(NPIX/(SCALE*NPN)), |
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| 37 | dmax(SCALE/NPIX) |
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[396] | 38 | { |
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[397] | 39 | scale = Vector3(scalex, scaley, scalez); |
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[404] | 40 | slice_vector = new float[size*size*4]; |
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[396] | 41 | |
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| 42 | //initialize the pattern texture |
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| 43 | glGenTextures(1, &pattern_tex); |
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| 44 | glBindTexture(GL_TEXTURE_2D, pattern_tex); |
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| 45 | glTexParameteri(GL_TEXTURE_2D, |
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| 46 | GL_TEXTURE_WRAP_S, GL_REPEAT); |
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| 47 | glTexParameteri(GL_TEXTURE_2D, |
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| 48 | GL_TEXTURE_WRAP_T, GL_REPEAT); |
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| 49 | glTexParameteri(GL_TEXTURE_2D, |
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| 50 | GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
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| 51 | glTexParameteri(GL_TEXTURE_2D, |
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| 52 | GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
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| 53 | glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE); |
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| 54 | |
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| 55 | //initialize frame buffer objects |
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[397] | 56 | |
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| 57 | //render buffer for projecting 3D velocity onto a 2D plane |
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[396] | 58 | glGenFramebuffersEXT(1, &vel_fbo); |
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| 59 | glGenTextures(1, &slice_vector_tex); |
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| 60 | |
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| 61 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, vel_fbo); |
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| 62 | |
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| 63 | glBindTexture(GL_TEXTURE_RECTANGLE_NV, slice_vector_tex); |
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| 64 | glTexParameterf(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
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| 65 | glTexParameterf(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
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| 66 | glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0, |
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| 67 | GL_FLOAT_RGBA32_NV, size, size, 0, GL_RGBA, GL_FLOAT, NULL); |
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| 68 | glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, |
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| 69 | GL_TEXTURE_RECTANGLE_NV, slice_vector_tex, 0); |
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| 70 | |
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| 71 | |
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[397] | 72 | //render buffer for the convolution |
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[396] | 73 | glGenFramebuffersEXT(1, &fbo); |
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| 74 | glGenTextures(1, &color_tex); |
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| 75 | |
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| 76 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo); |
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| 77 | |
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| 78 | //initialize color texture for lic |
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| 79 | glBindTexture(GL_TEXTURE_2D, color_tex); |
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| 80 | glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
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| 81 | glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
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[401] | 82 | glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, width, height, 0, |
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[396] | 83 | GL_RGB, GL_INT, NULL); |
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| 84 | glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, |
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| 85 | GL_COLOR_ATTACHMENT0_EXT, |
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| 86 | GL_TEXTURE_2D, color_tex, 0); |
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| 87 | |
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| 88 | // Check framebuffer completeness at the end of initialization. |
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| 89 | CHECK_FRAMEBUFFER_STATUS(); |
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| 90 | assert(glGetError()==0); |
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| 91 | |
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[1111] | 92 | m_render_vel_fprog = LoadProgram(m_g_context, CG_PROFILE_FP30, CG_SOURCE, |
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| 93 | NULL, "render_vel.cg"); |
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| 94 | m_vel_tex_param_render_vel = cgGetNamedParameter(m_render_vel_fprog, |
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| 95 | "vel_tex"); |
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| 96 | m_plane_normal_param_render_vel = cgGetNamedParameter(m_render_vel_fprog, |
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| 97 | "plane_normal"); |
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[397] | 98 | cgGLSetTextureParameter(m_vel_tex_param_render_vel, _vector_field); |
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| 99 | |
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| 100 | get_slice(); |
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| 101 | make_patterns(); |
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[396] | 102 | } |
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| 103 | |
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[397] | 104 | Lic::~Lic(){ |
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| 105 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, vel_fbo); |
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| 106 | glDeleteTextures(1, &slice_vector_tex); |
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[396] | 107 | |
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[397] | 108 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo); |
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| 109 | glDeleteTextures(1, &color_tex); |
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| 110 | |
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| 111 | NVISid buffers[2] = {vel_fbo, fbo}; |
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| 112 | glDeleteFramebuffersEXT(2, buffers); |
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| 113 | |
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| 114 | delete slice_vector; |
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| 115 | } |
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| 116 | |
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| 117 | void Lic::make_patterns() |
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[396] | 118 | { |
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[1474] | 119 | int lut[256]; |
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| 120 | int phase[NPN][NPN]; |
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| 121 | GLubyte pat[NPN][NPN][4]; |
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| 122 | int i, j, k, t; |
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[396] | 123 | |
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[1474] | 124 | for (i = 0; i < 256; i++) lut[i] = i < 127 ? 0 : 255; |
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| 125 | for (i = 0; i < NPN; i++) |
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| 126 | for (j = 0; j < NPN; j++) phase[i][j] = rand() % 256; |
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| 127 | |
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| 128 | for (k = 0; k < Npat; k++) { |
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| 129 | t = k*256/Npat; |
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| 130 | for (i = 0; i < NPN; i++) |
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| 131 | for (j = 0; j < NPN; j++) { |
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| 132 | pat[i][j][0] = |
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| 133 | pat[i][j][1] = |
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| 134 | pat[i][j][2] = lut[(t + phase[i][j]) % 255]; |
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| 135 | pat[i][j][3] = alpha; |
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| 136 | } |
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| 137 | |
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| 138 | glNewList(k + 1, GL_COMPILE); |
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| 139 | glBindTexture(GL_TEXTURE_2D, pattern_tex); |
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| 140 | glTexImage2D(GL_TEXTURE_2D, 0, 4, NPN, NPN, 0, |
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[396] | 141 | GL_RGBA, GL_UNSIGNED_BYTE, pat); |
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[1474] | 142 | glEndList(); |
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| 143 | } |
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[396] | 144 | } |
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| 145 | |
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| 146 | |
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[397] | 147 | void Lic::make_magnitudes() |
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[396] | 148 | { |
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| 149 | |
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| 150 | GLubyte mag[NMESH][NMESH][4]; |
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| 151 | |
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| 152 | //read vector filed |
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| 153 | for(int i=0; i<NMESH; i++){ |
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| 154 | for(int j=0; j<NMESH; j++){ |
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| 155 | |
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| 156 | float x=DM*i; |
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| 157 | float y=DM*j; |
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| 158 | |
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| 159 | float magnitude = sqrt(x*x+y*y)/1.414; |
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| 160 | |
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| 161 | //from green to red |
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| 162 | GLubyte r = floor(magnitude*255); |
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| 163 | GLubyte g = 0; |
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| 164 | GLubyte b = 255 - r; |
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| 165 | GLubyte a = 122; |
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| 166 | |
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| 167 | mag[i][j][0] = r; |
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| 168 | mag[i][j][1] = g; |
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| 169 | mag[i][j][2] = b; |
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| 170 | mag[i][j][3] = a; |
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| 171 | } |
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| 172 | } |
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| 173 | |
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| 174 | glGenTextures(1, &mag_tex); |
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| 175 | glBindTexture(GL_TEXTURE_2D, mag_tex); |
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| 176 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); |
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| 177 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); |
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| 178 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
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| 179 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
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| 180 | //glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_BLEND); |
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| 181 | glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, NMESH, NMESH, 0, GL_RGBA, GL_UNSIGNED_BYTE, mag); |
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| 182 | |
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| 183 | } |
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| 184 | |
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[397] | 185 | //project 3D vectors to a 2D slice for line integral convolution |
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| 186 | void Lic::get_slice(){ |
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| 187 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, vel_fbo); |
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| 188 | glBindTexture(GL_TEXTURE_RECTANGLE_NV, slice_vector_tex); |
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[396] | 189 | |
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[397] | 190 | glClear(GL_COLOR_BUFFER_BIT); |
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| 191 | |
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| 192 | glViewport(0, 0, NMESH, NMESH); |
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| 193 | glMatrixMode(GL_PROJECTION); |
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| 194 | glLoadIdentity(); |
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| 195 | gluOrtho2D(0, NMESH, 0, NMESH); |
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| 196 | glMatrixMode(GL_MODELVIEW); |
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| 197 | glLoadIdentity(); |
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| 198 | |
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[1478] | 199 | Trace("get_slice: binding lic vec prog"); |
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[397] | 200 | cgGLBindProgram(m_render_vel_fprog); |
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[1478] | 201 | Trace("get_slice: done binding lic vec prog"); |
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[397] | 202 | cgGLEnableTextureParameter(m_vel_tex_param_render_vel); |
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| 203 | cgGLSetParameter4f(m_plane_normal_param_render_vel, 1., 1., 0., 0); |
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| 204 | |
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| 205 | cgGLEnableProfile(CG_PROFILE_FP30); |
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| 206 | glBegin(GL_QUADS); |
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| 207 | glTexCoord3f(0., 0., offset); glVertex2f(0., 0.); |
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| 208 | glTexCoord3f(1., 0., offset); glVertex2f(size, 0.); |
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| 209 | glTexCoord3f(1., 1., offset); glVertex2f(size, size); |
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| 210 | glTexCoord3f(0., 1., offset); glVertex2f(0., size); |
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| 211 | glEnd(); |
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| 212 | cgGLDisableProfile(CG_PROFILE_FP30); |
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| 213 | |
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| 214 | cgGLDisableTextureParameter(m_vel_tex_param_render_vel); |
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| 215 | |
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| 216 | //read the vectors |
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| 217 | glReadPixels(0, 0, NMESH, NMESH, GL_RGBA, GL_FLOAT, slice_vector); |
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| 218 | /* |
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| 219 | for(int i=0; i<NMESH*NMESH; i++){ |
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| 220 | fprintf(stderr, "%f,%f,%f,%f", slice_vector[4*i], slice_vector[4*i+1], slice_vector[4*i+2], slice_vector[4*i+3]); |
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| 221 | } |
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| 222 | */ |
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| 223 | assert(glGetError()==0); |
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| 224 | } |
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| 225 | |
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| 226 | |
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[396] | 227 | //line integral convolution |
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| 228 | void Lic::convolve(){ |
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[397] | 229 | |
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[396] | 230 | int i, j; |
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| 231 | float x1, x2, y, px, py; |
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| 232 | |
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[397] | 233 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo); |
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| 234 | |
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[396] | 235 | glViewport(0, 0, (GLsizei) NPIX, (GLsizei) NPIX); |
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| 236 | glMatrixMode(GL_PROJECTION); |
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| 237 | glLoadIdentity(); |
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| 238 | glTranslatef(-1.0, -1.0, 0.0); |
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| 239 | glScalef(2.0, 2.0, 1.0); |
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| 240 | |
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| 241 | //sa = 0.010*cos(iframe*2.0*M_PI/200.0); |
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| 242 | glBindTexture(GL_TEXTURE_2D, pattern_tex); |
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| 243 | glEnable(GL_TEXTURE_2D); |
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| 244 | sa = 0.01; |
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| 245 | for (i = 0; i < NMESH-1; i++) { |
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| 246 | x1 = DM*i; x2 = x1 + DM; |
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| 247 | glBegin(GL_QUAD_STRIP); |
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| 248 | for (j = 0; j < NMESH-1; j++) { |
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| 249 | y = DM*j; |
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| 250 | glTexCoord2f(x1, y); |
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[397] | 251 | get_velocity(x1, y, &px, &py); |
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[396] | 252 | glVertex2f(px, py); |
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| 253 | |
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| 254 | glTexCoord2f(x2, y); |
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[397] | 255 | get_velocity(x2, y, &px, &py); |
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[396] | 256 | glVertex2f(px, py); |
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| 257 | } |
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| 258 | glEnd(); |
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| 259 | } |
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| 260 | iframe = iframe + 1; |
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| 261 | |
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| 262 | glEnable(GL_BLEND); |
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| 263 | glCallList(iframe % Npat + 1); |
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| 264 | glBegin(GL_QUAD_STRIP); |
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| 265 | glTexCoord2f(0.0, 0.0); glVertex2f(0.0, 0.0); |
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| 266 | glTexCoord2f(0.0, tmax); glVertex2f(0.0, 1.0); |
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| 267 | glTexCoord2f(tmax, 0.0); glVertex2f(1.0, 0.0); |
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| 268 | glTexCoord2f(tmax, tmax); glVertex2f(1.0, 1.0); |
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| 269 | glEnd(); |
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| 270 | |
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| 271 | /* |
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| 272 | //inject dye |
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| 273 | glDisable(GL_TEXTURE_2D); |
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| 274 | glColor4f(1.,0.8,0.,1.); |
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| 275 | glBegin(GL_QUADS); |
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| 276 | glVertex2d(0.6, 0.6); |
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| 277 | glVertex2d(0.6, 0.62); |
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| 278 | glVertex2d(0.62, 0.62); |
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| 279 | glVertex2d(0.62, 0.6); |
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| 280 | glEnd(); |
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| 281 | */ |
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| 282 | |
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| 283 | glDisable(GL_BLEND); |
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| 284 | glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 0, 0, NPIX, NPIX, 0); |
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[397] | 285 | |
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| 286 | /* |
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| 287 | //blend magnitude texture |
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| 288 | glBindTexture(GL_TEXTURE_2D, mag_tex); |
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| 289 | glEnable(GL_TEXTURE_2D); |
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| 290 | glEnable(GL_BLEND); |
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| 291 | glBegin(GL_QUADS); |
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| 292 | glTexCoord2f(0.0, 0.0); glVertex2f(0.0, 0.0); |
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| 293 | glTexCoord2f(0.0, 1.0); glVertex2f(0.0, 1.); |
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| 294 | glTexCoord2f(1.0, 1.0); glVertex2f(1., 1.); |
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| 295 | glTexCoord2f(1.0, 0.0); glVertex2f(1., 0.0); |
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| 296 | glEnd(); |
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| 297 | */ |
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[396] | 298 | } |
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| 299 | |
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[401] | 300 | void Lic::render(){ display(); } |
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| 301 | |
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| 302 | |
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[397] | 303 | void Lic::display(){ |
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[396] | 304 | |
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[397] | 305 | glBindTexture(GL_TEXTURE_2D, color_tex); |
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| 306 | glEnable(GL_TEXTURE_2D); |
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[396] | 307 | |
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[397] | 308 | //draw line integral convolution quad |
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| 309 | glEnable(GL_DEPTH_TEST); |
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| 310 | glPushMatrix(); |
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| 311 | glScalef(scale.x, scale.y, scale.z); |
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| 312 | |
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| 313 | glBegin(GL_QUADS); |
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| 314 | glTexCoord2f(0, 0); glVertex3f(0, 0, offset); |
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| 315 | glTexCoord2f(1, 0); glVertex3f(1, 0, offset); |
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| 316 | glTexCoord2f(1, 1); glVertex3f(1, 1, offset); |
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| 317 | glTexCoord2f(0, 1); glVertex3f(0, 1, offset); |
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| 318 | glEnd(); |
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| 319 | |
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| 320 | glPopMatrix(); |
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| 321 | |
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| 322 | glDisable(GL_DEPTH_TEST); |
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| 323 | glDisable(GL_TEXTURE_2D); |
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[396] | 324 | } |
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| 325 | |
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[397] | 326 | |
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| 327 | void Lic::get_velocity(float x, float y, float *px, float *py) |
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| 328 | { |
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| 329 | float dx, dy, vx, vy, r; |
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| 330 | |
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| 331 | int xi = x*NMESH; |
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| 332 | int yi = y*NMESH; |
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| 333 | |
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| 334 | vx = slice_vector[4*(xi+yi*NMESH)]; |
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| 335 | vy = slice_vector[4*(xi+yi*NMESH)+1]; |
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| 336 | r = vx*vx + vy*vy; |
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| 337 | if (r > dmax*dmax) { |
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| 338 | r = sqrt(r); |
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| 339 | vx *= dmax/r; |
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| 340 | vy *= dmax/r; |
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| 341 | } |
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| 342 | *px = x + vx; |
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| 343 | *py = y + vy; |
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| 344 | } |
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| 345 | |
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[587] | 346 | void Lic::set_offset(float v) |
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| 347 | { |
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[397] | 348 | offset = v; |
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| 349 | get_slice(); |
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| 350 | } |
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