qvolray

annotate src/volume.cc @ 11:8990b5d2c7fe

find changesets by author, revision, files, or words in the commit message
moving to qt
author John Tsiombikas <nuclear@member.fsf.org>
date Mon, 09 Apr 2012 23:42:57 +0300
parents src/volume.c@9d2396738b60
children 17d9dc2edc91
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@8 7
nuclear@8 8 #ifndef __APPLE__
nuclear@8 9 #include <GL/gl.h>
nuclear@8 10 #else
nuclear@8 11 #include <OpenGL/gl.h>
nuclear@8 12 #endif
nuclear@8 13
nuclear@8 14 #include <imago2.h>
nuclear@9 15 #include "volume.h"
nuclear@8 16
nuclear@9 17 static void calc_gradients(float *voxels, int xsz, int ysz, int zsz);
nuclear@8 18 static struct slice *read_voldesc(const char *fname, struct volume *vol);
nuclear@8 19 static char *trim(char *str);
nuclear@8 20
nuclear@11 21 Volume::Volume()
nuclear@8 22 {
nuclear@11 23 sz[0] = sz[1] = sz[2] = 0;
nuclear@11 24 zaspect = 1.0;
nuclear@11 25 tex = 0;
nuclear@11 26 }
nuclear@11 27
nuclear@11 28 Volume::~Volume()
nuclear@11 29 {
nuclear@11 30 if(tex) {
nuclear@11 31 glDeleteTextures(1, &tex);
nuclear@11 32 }
nuclear@11 33 }
nuclear@11 34
nuclear@11 35 bool Volume::load(const char *fname)
nuclear@11 36 {
nuclear@11 37 std::list<std::string> slist;
nuclear@9 38 float *voxels = 0, *vptr;
nuclear@9 39 struct img_pixmap img;
nuclear@8 40
nuclear@11 41 if(!(read_voldesc(fname, &slist))) {
nuclear@11 42 return false;
nuclear@8 43 }
nuclear@8 44
nuclear@9 45 /* load the first image to determine slice dimensions */
nuclear@9 46 img_init(&img);
nuclear@11 47 if(img_load(&img, slist.begin().name.c_str()) == -1) {
nuclear@9 48 fprintf(stderr, "failed to load volume slice: %s\n", slist->name);
nuclear@11 49 return false;
nuclear@9 50 }
nuclear@9 51
nuclear@11 52 sz[0] = img.width;
nuclear@11 53 sz[1] = img.height;
nuclear@9 54 printf("volume dimensions: %dx%dx%d\n", img.width, img.height, vol->sz[2]);
nuclear@9 55
nuclear@9 56 /* allocate the whole volume at once */
nuclear@11 57 voxels = new float[sz[0] * sz[1] * sz[2] * 4];
nuclear@9 58 vptr = voxels;
nuclear@9 59 img_destroy(&img);
nuclear@9 60
nuclear@9 61 /* put the volume data into the alpha component */
nuclear@11 62 for(auto slice : slist) {
nuclear@9 63 int x, y, xsz, ysz;
nuclear@9 64 float *pixels, *src;
nuclear@9 65
nuclear@11 66 if(!(pixels = img_load_pixels(slice.name.c_str(), &xsz, &ysz, IMG_FMT_GREYF))) {
nuclear@11 67 fprintf(stderr, "failed to load volume slice: %s\n", slice.name.c_str());
nuclear@11 68 delete [] voxels;
nuclear@11 69 return false;
nuclear@9 70 }
nuclear@9 71
nuclear@11 72 if(xsz != sz[0] || ysz != sz[1]) {
nuclear@9 73 fprintf(stderr, "inconsistent dimensions for slice %s: %dx%d (%dx%d expected)\n",
nuclear@11 74 slice.name.c_str(), xsz, ysz, sz[0], sz[1]);
nuclear@11 75 delete [] voxels;
nuclear@11 76 return false;
nuclear@9 77 }
nuclear@9 78
nuclear@9 79 src = pixels;
nuclear@9 80 for(y=0; y<ysz; y++) {
nuclear@9 81 for(x=0; x<xsz; x++) {
nuclear@9 82 vptr[0] = vptr[1] = vptr[2] = 0.0f;
nuclear@9 83 vptr[3] = *src++;
nuclear@9 84 vptr += 4;
nuclear@9 85 }
nuclear@9 86 }
nuclear@9 87 img_free_pixels(pixels);
nuclear@9 88 }
nuclear@9 89
nuclear@9 90 /* calculate gradients */
nuclear@11 91 calc_gradients(voxels, sz[0], sz[1], sz[2]);
nuclear@9 92
nuclear@9 93 /* create the volume texture */
nuclear@11 94 glGenTextures(1, &tex);
nuclear@11 95 glBindTexture(GL_TEXTURE_3D, tex);
nuclear@8 96 glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@8 97 glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@8 98 glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
nuclear@8 99 glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
nuclear@8 100 glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
nuclear@11 101 glTexImage3D(GL_TEXTURE_3D, 0, GL_RGBA32F_ARB, sz[0], sz[1], sz[2], 0, GL_RGBA, GL_FLOAT, voxels);
nuclear@8 102
nuclear@9 103 /* ... and destroy our copy */
nuclear@11 104 delete [] voxels;
nuclear@11 105 return true;
nuclear@9 106 }
nuclear@9 107
nuclear@11 108 unsigned int Volume::get_texture() const
nuclear@9 109 {
nuclear@11 110 return tex;
nuclear@11 111 }
nuclear@11 112
nuclear@11 113 void Volume::bind(int tex_unit) const
nuclear@11 114 {
nuclear@11 115 glActiveTexture(GL_TEXTURE0 + tex_unit);
nuclear@11 116 glBindTexture(GL_TEXTURE_3D, tex);
nuclear@9 117 }
nuclear@9 118
nuclear@9 119 struct vec4 { float x, y, z, w; };
nuclear@9 120
nuclear@9 121 static void calc_gradients(float *voxels, int xsz, int ysz, int zsz)
nuclear@9 122 {
nuclear@9 123 int x, y, z, slice_pixels = xsz * ysz;
nuclear@11 124 vec4 *vptr = (vec4*)voxels;
nuclear@9 125
nuclear@9 126 for(z=0; z<zsz; z++) {
nuclear@9 127 for(y=0; y<ysz; y++) {
nuclear@9 128 for(x=0; x<xsz; x++) {
nuclear@9 129 float x0, x1, y0, y1, z0, z1;
nuclear@9 130
nuclear@9 131 x0 = x > 0 ? (vptr - 1)->w : vptr->w;
nuclear@9 132 y0 = y > 0 ? (vptr - xsz)->w : vptr->w;
nuclear@9 133 z0 = z > 0 ? (vptr - slice_pixels)->w : vptr->w;
nuclear@9 134 x1 = x < xsz - 1 ? (vptr + 1)->w : vptr->w;
nuclear@9 135 y1 = y < ysz - 1 ? (vptr + xsz)->w : vptr->w;
nuclear@9 136 z1 = z < zsz - 1 ? (vptr + slice_pixels)->w : vptr->w;
nuclear@9 137
nuclear@9 138 vptr->x = x1 - x0;
nuclear@9 139 vptr->y = y1 - y0;
nuclear@9 140 vptr->z = z1 - z0;
nuclear@9 141
nuclear@9 142 vptr++;
nuclear@9 143 }
nuclear@9 144 }
nuclear@9 145 }
nuclear@8 146 }
nuclear@8 147
nuclear@11 148 bool read_voldesc(const char *fname, std::list<std::string> *slist) const
nuclear@8 149 {
nuclear@8 150 FILE *fp = 0;
nuclear@9 151 char buf[512], *slash, *prefix = "";
nuclear@8 152 int mode_slices = 0;
nuclear@11 153
nuclear@11 154 slist->clear();
nuclear@8 155
nuclear@8 156 if(!(fp = fopen(fname, "r"))) {
nuclear@8 157 fprintf(stderr, "failed to open volume descriptor: %s\n", fname);
nuclear@11 158 return false;
nuclear@8 159 }
nuclear@8 160 fgets(buf, sizeof buf, fp);
nuclear@8 161 if(strstr(buf, "VOLDESC") != buf) {
nuclear@8 162 fprintf(stderr, "invalid file format while trying to read volume descriptor: %s\n", fname);
nuclear@11 163 fclose(fp);
nuclear@11 164 return false;
nuclear@8 165 }
nuclear@8 166
nuclear@9 167 if((slash = strrchr(fname, '/'))) {
nuclear@9 168 int len = slash - fname + 1;
nuclear@9 169 prefix = alloca(len + 1);
nuclear@9 170 memcpy(prefix, fname, len);
nuclear@9 171 prefix[len] = 0;
nuclear@9 172 }
nuclear@9 173
nuclear@8 174 while(fgets(buf, sizeof buf, fp)) {
nuclear@8 175 char *line = trim(buf);
nuclear@8 176
nuclear@8 177 if(!*line || *line == '#')
nuclear@8 178 continue;
nuclear@8 179
nuclear@8 180 if(mode_slices) {
nuclear@8 181 /* we're in the part that contains filenames... append to the list */
nuclear@11 182 slist->push_back(std::string(prefix) + std::string(line));
nuclear@11 183 sz[2]++;
nuclear@8 184 } else {
nuclear@8 185 /* TODO we're in the options part... parse */
nuclear@9 186 if(strcmp(line, "SLICES") == 0) {
nuclear@9 187 mode_slices = 1;
nuclear@9 188 }
nuclear@8 189 }
nuclear@8 190 }
nuclear@8 191 fclose(fp);
nuclear@8 192
nuclear@11 193 if(slist->empty()) {
nuclear@8 194 fprintf(stderr, "file: %s contains no slices\n", fname);
nuclear@11 195 return false;
nuclear@8 196 }
nuclear@11 197 return true;
nuclear@8 198 }
nuclear@8 199
nuclear@8 200 static char *trim(char *str)
nuclear@8 201 {
nuclear@8 202 char *tmp = str + strlen(str) - 1;
nuclear@8 203
nuclear@8 204 while(isspace(*tmp))
nuclear@8 205 tmp--;
nuclear@8 206 tmp[1] = 0;
nuclear@8 207
nuclear@8 208 tmp = str;
nuclear@8 209 while(isspace(*tmp))
nuclear@8 210 tmp++;
nuclear@8 211 return tmp;
nuclear@8 212 }