qvolray

annotate src/volume.cc @ 17:535762131d34

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fixed to compile on visual studio 2010
author John Tsiombikas <nuclear@member.fsf.org>
date Wed, 11 Apr 2012 01:44:45 +0200
parents 17d9dc2edc91
children 3d05c261a2f4
rev   line source
nuclear@8 1 #include <stdio.h>
nuclear@8 2 #include <stdlib.h>
nuclear@8 3 #include <string.h>
nuclear@8 4 #include <ctype.h>
nuclear@11 5 #include <list>
nuclear@11 6 #include <string>
nuclear@17 7 #include <GL/glew.h>
nuclear@8 8 #include <imago2.h>
nuclear@9 9 #include "volume.h"
nuclear@8 10
nuclear@9 11 static void calc_gradients(float *voxels, int xsz, int ysz, int zsz);
nuclear@8 12 static struct slice *read_voldesc(const char *fname, struct volume *vol);
nuclear@8 13 static char *trim(char *str);
nuclear@8 14
nuclear@11 15 Volume::Volume()
nuclear@8 16 {
nuclear@11 17 sz[0] = sz[1] = sz[2] = 0;
nuclear@11 18 zaspect = 1.0;
nuclear@11 19 tex = 0;
nuclear@11 20 }
nuclear@11 21
nuclear@11 22 Volume::~Volume()
nuclear@11 23 {
nuclear@11 24 if(tex) {
nuclear@11 25 glDeleteTextures(1, &tex);
nuclear@11 26 }
nuclear@11 27 }
nuclear@11 28
nuclear@11 29 bool Volume::load(const char *fname)
nuclear@11 30 {
nuclear@11 31 std::list<std::string> slist;
nuclear@9 32 float *voxels = 0, *vptr;
nuclear@9 33 struct img_pixmap img;
nuclear@8 34
nuclear@11 35 if(!(read_voldesc(fname, &slist))) {
nuclear@11 36 return false;
nuclear@8 37 }
nuclear@8 38
nuclear@9 39 /* load the first image to determine slice dimensions */
nuclear@9 40 img_init(&img);
nuclear@13 41 if(img_load(&img, slist.begin()->c_str()) == -1) {
nuclear@13 42 fprintf(stderr, "failed to load volume slice: %s\n", slist.begin()->c_str());
nuclear@11 43 return false;
nuclear@9 44 }
nuclear@9 45
nuclear@11 46 sz[0] = img.width;
nuclear@11 47 sz[1] = img.height;
nuclear@13 48 printf("volume dimensions: %dx%dx%d\n", img.width, img.height, sz[2]);
nuclear@9 49
nuclear@9 50 /* allocate the whole volume at once */
nuclear@11 51 voxels = new float[sz[0] * sz[1] * sz[2] * 4];
nuclear@9 52 vptr = voxels;
nuclear@9 53 img_destroy(&img);
nuclear@9 54
nuclear@9 55 /* put the volume data into the alpha component */
nuclear@17 56 //for(auto slice : slist) { // fucking vs2010 doesn't support range-for
nuclear@17 57 for(auto iter = slist.begin(); iter != slist.end(); iter++) {
nuclear@17 58 auto slice = *iter;
nuclear@17 59
nuclear@9 60 int x, y, xsz, ysz;
nuclear@9 61 float *pixels, *src;
nuclear@9 62
nuclear@13 63 if(!(pixels = (float*)img_load_pixels(slice.c_str(), &xsz, &ysz, IMG_FMT_GREYF))) {
nuclear@13 64 fprintf(stderr, "failed to load volume slice: %s\n", slice.c_str());
nuclear@11 65 delete [] voxels;
nuclear@11 66 return false;
nuclear@9 67 }
nuclear@9 68
nuclear@11 69 if(xsz != sz[0] || ysz != sz[1]) {
nuclear@9 70 fprintf(stderr, "inconsistent dimensions for slice %s: %dx%d (%dx%d expected)\n",
nuclear@13 71 slice.c_str(), xsz, ysz, sz[0], sz[1]);
nuclear@11 72 delete [] voxels;
nuclear@11 73 return false;
nuclear@9 74 }
nuclear@9 75
nuclear@9 76 src = pixels;
nuclear@9 77 for(y=0; y<ysz; y++) {
nuclear@9 78 for(x=0; x<xsz; x++) {
nuclear@9 79 vptr[0] = vptr[1] = vptr[2] = 0.0f;
nuclear@9 80 vptr[3] = *src++;
nuclear@9 81 vptr += 4;
nuclear@9 82 }
nuclear@9 83 }
nuclear@9 84 img_free_pixels(pixels);
nuclear@9 85 }
nuclear@9 86
nuclear@9 87 /* calculate gradients */
nuclear@11 88 calc_gradients(voxels, sz[0], sz[1], sz[2]);
nuclear@9 89
nuclear@9 90 /* create the volume texture */
nuclear@11 91 glGenTextures(1, &tex);
nuclear@11 92 glBindTexture(GL_TEXTURE_3D, tex);
nuclear@8 93 glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@8 94 glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@8 95 glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
nuclear@8 96 glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
nuclear@8 97 glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
nuclear@11 98 glTexImage3D(GL_TEXTURE_3D, 0, GL_RGBA32F_ARB, sz[0], sz[1], sz[2], 0, GL_RGBA, GL_FLOAT, voxels);
nuclear@8 99
nuclear@9 100 /* ... and destroy our copy */
nuclear@11 101 delete [] voxels;
nuclear@11 102 return true;
nuclear@9 103 }
nuclear@9 104
nuclear@11 105 unsigned int Volume::get_texture() const
nuclear@9 106 {
nuclear@11 107 return tex;
nuclear@11 108 }
nuclear@11 109
nuclear@11 110 void Volume::bind(int tex_unit) const
nuclear@11 111 {
nuclear@11 112 glActiveTexture(GL_TEXTURE0 + tex_unit);
nuclear@11 113 glBindTexture(GL_TEXTURE_3D, tex);
nuclear@9 114 }
nuclear@9 115
nuclear@9 116 struct vec4 { float x, y, z, w; };
nuclear@9 117
nuclear@9 118 static void calc_gradients(float *voxels, int xsz, int ysz, int zsz)
nuclear@9 119 {
nuclear@9 120 int x, y, z, slice_pixels = xsz * ysz;
nuclear@11 121 vec4 *vptr = (vec4*)voxels;
nuclear@9 122
nuclear@9 123 for(z=0; z<zsz; z++) {
nuclear@9 124 for(y=0; y<ysz; y++) {
nuclear@9 125 for(x=0; x<xsz; x++) {
nuclear@9 126 float x0, x1, y0, y1, z0, z1;
nuclear@9 127
nuclear@9 128 x0 = x > 0 ? (vptr - 1)->w : vptr->w;
nuclear@9 129 y0 = y > 0 ? (vptr - xsz)->w : vptr->w;
nuclear@9 130 z0 = z > 0 ? (vptr - slice_pixels)->w : vptr->w;
nuclear@9 131 x1 = x < xsz - 1 ? (vptr + 1)->w : vptr->w;
nuclear@9 132 y1 = y < ysz - 1 ? (vptr + xsz)->w : vptr->w;
nuclear@9 133 z1 = z < zsz - 1 ? (vptr + slice_pixels)->w : vptr->w;
nuclear@9 134
nuclear@9 135 vptr->x = x1 - x0;
nuclear@9 136 vptr->y = y1 - y0;
nuclear@9 137 vptr->z = z1 - z0;
nuclear@9 138
nuclear@9 139 vptr++;
nuclear@9 140 }
nuclear@9 141 }
nuclear@9 142 }
nuclear@8 143 }
nuclear@8 144
nuclear@13 145 bool Volume::read_voldesc(const char *fname, std::list<std::string> *slist)
nuclear@8 146 {
nuclear@8 147 FILE *fp = 0;
nuclear@9 148 char buf[512], *slash, *prefix = "";
nuclear@8 149 int mode_slices = 0;
nuclear@11 150
nuclear@11 151 slist->clear();
nuclear@8 152
nuclear@8 153 if(!(fp = fopen(fname, "r"))) {
nuclear@8 154 fprintf(stderr, "failed to open volume descriptor: %s\n", fname);
nuclear@11 155 return false;
nuclear@8 156 }
nuclear@8 157 fgets(buf, sizeof buf, fp);
nuclear@8 158 if(strstr(buf, "VOLDESC") != buf) {
nuclear@8 159 fprintf(stderr, "invalid file format while trying to read volume descriptor: %s\n", fname);
nuclear@11 160 fclose(fp);
nuclear@11 161 return false;
nuclear@8 162 }
nuclear@8 163
nuclear@13 164 if((slash = strrchr((char*)fname, '/'))) {
nuclear@9 165 int len = slash - fname + 1;
nuclear@13 166 prefix = (char*)alloca(len + 1);
nuclear@9 167 memcpy(prefix, fname, len);
nuclear@9 168 prefix[len] = 0;
nuclear@9 169 }
nuclear@9 170
nuclear@8 171 while(fgets(buf, sizeof buf, fp)) {
nuclear@8 172 char *line = trim(buf);
nuclear@8 173
nuclear@8 174 if(!*line || *line == '#')
nuclear@8 175 continue;
nuclear@8 176
nuclear@8 177 if(mode_slices) {
nuclear@8 178 /* we're in the part that contains filenames... append to the list */
nuclear@11 179 slist->push_back(std::string(prefix) + std::string(line));
nuclear@11 180 sz[2]++;
nuclear@8 181 } else {
nuclear@8 182 /* TODO we're in the options part... parse */
nuclear@9 183 if(strcmp(line, "SLICES") == 0) {
nuclear@9 184 mode_slices = 1;
nuclear@9 185 }
nuclear@8 186 }
nuclear@8 187 }
nuclear@8 188 fclose(fp);
nuclear@8 189
nuclear@11 190 if(slist->empty()) {
nuclear@8 191 fprintf(stderr, "file: %s contains no slices\n", fname);
nuclear@11 192 return false;
nuclear@8 193 }
nuclear@11 194 return true;
nuclear@8 195 }
nuclear@8 196
nuclear@8 197 static char *trim(char *str)
nuclear@8 198 {
nuclear@8 199 char *tmp = str + strlen(str) - 1;
nuclear@8 200
nuclear@8 201 while(isspace(*tmp))
nuclear@8 202 tmp--;
nuclear@8 203 tmp[1] = 0;
nuclear@8 204
nuclear@8 205 tmp = str;
nuclear@8 206 while(isspace(*tmp))
nuclear@8 207 tmp++;
nuclear@8 208 return tmp;
nuclear@8 209 }