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annotate examples/imgthumbs/src/thumbs.c @ 2:026cdd1737ff

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added spaceball controls to the example and needless GLEW dependency
author John Tsiombikas <nuclear@member.fsf.org>
date Fri, 31 Jan 2014 03:40:00 +0200
parents 469ce01809bc
children 410c19c735b2
rev   line source
nuclear@1 1 #include <stdio.h>
nuclear@1 2 #include <stdlib.h>
nuclear@1 3 #include <string.h>
nuclear@1 4 #include <errno.h>
nuclear@1 5 #include <dirent.h>
nuclear@1 6 #include <imago2.h>
nuclear@1 7 #include "opengl.h"
nuclear@1 8 #include "thumbs.h"
nuclear@1 9
nuclear@1 10 struct thumbnail *create_thumbs(const char *dirpath)
nuclear@1 11 {
nuclear@1 12 DIR *dir;
nuclear@1 13 struct dirent *dent;
nuclear@1 14 struct thumbnail *list = 0;
nuclear@1 15
nuclear@2 16 unsigned int intfmt = GL_COMPRESSED_RGB;
nuclear@2 17 if(!GLEW_ARB_texture_compression) {
nuclear@2 18 printf("warning, no texture compression available.\n");
nuclear@2 19 intfmt = GL_RGB;
nuclear@2 20 }
nuclear@2 21
nuclear@1 22 if(!(dir = opendir(dirpath))) {
nuclear@1 23 fprintf(stderr, "failed to open directory: %s: %s\n", dirpath, strerror(errno));
nuclear@1 24 return 0;
nuclear@1 25 }
nuclear@1 26
nuclear@1 27 while((dent = readdir(dir))) {
nuclear@1 28 int xsz, ysz;
nuclear@1 29 unsigned char *pixels;
nuclear@1 30 struct thumbnail *node;
nuclear@1 31
nuclear@1 32 if(!(node = malloc(sizeof *node))) {
nuclear@1 33 perror("failed to allocate thumbnail list node");
nuclear@1 34 continue;
nuclear@1 35 }
nuclear@1 36
nuclear@1 37 if(!(node->fname = malloc(strlen(dirpath) + strlen(dent->d_name) + 2))) {
nuclear@1 38 free(node);
nuclear@1 39 continue;
nuclear@1 40 }
nuclear@1 41 strcpy(node->fname, dirpath);
nuclear@1 42 if(dirpath[strlen(dirpath) - 1] != '/') {
nuclear@1 43 strcat(node->fname, "/");
nuclear@1 44 }
nuclear@1 45 strcat(node->fname, dent->d_name);
nuclear@1 46
nuclear@1 47 if(!(pixels = img_load_pixels(node->fname, &xsz, &ysz, IMG_FMT_RGBA32))) {
nuclear@1 48 free(node->fname);
nuclear@1 49 free(node);
nuclear@1 50 continue;
nuclear@1 51 }
nuclear@1 52
nuclear@1 53 printf("loaded image: %s\n", node->fname);
nuclear@1 54
nuclear@1 55 glGenTextures(1, &node->tex);
nuclear@1 56 glBindTexture(GL_TEXTURE_2D, node->tex);
nuclear@1 57 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@1 58 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@2 59 glTexImage2D(GL_TEXTURE_2D, 0, intfmt, xsz, ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
nuclear@1 60 img_free_pixels(pixels);
nuclear@1 61
nuclear@1 62 node->aspect = (float)xsz / (float)ysz;
nuclear@1 63
nuclear@1 64 node->next = list;
nuclear@1 65 list = node;
nuclear@1 66 }
nuclear@1 67 closedir(dir);
nuclear@1 68
nuclear@1 69 return list;
nuclear@1 70 }
nuclear@1 71
nuclear@1 72 void free_thumbs(struct thumbnail *thumbs)
nuclear@1 73 {
nuclear@1 74 if(!thumbs) return;
nuclear@1 75
nuclear@1 76 while(thumbs) {
nuclear@1 77 struct thumbnail *tmp = thumbs;
nuclear@1 78 thumbs = thumbs->next;
nuclear@1 79
nuclear@1 80 free(tmp->fname);
nuclear@1 81 free(tmp);
nuclear@1 82 }
nuclear@1 83 }
nuclear@1 84
nuclear@1 85
nuclear@1 86 void draw_thumbs(struct thumbnail *thumbs, float thumb_sz, float start_y)
nuclear@1 87 {
nuclear@1 88 int vp[4];
nuclear@1 89 float gap = thumb_sz / 4.0;
nuclear@1 90 float x = gap;
nuclear@1 91 float y = gap + start_y;
nuclear@1 92 float view_aspect;
nuclear@1 93
nuclear@1 94 glGetIntegerv(GL_VIEWPORT, vp);
nuclear@1 95 view_aspect = (float)(vp[2] - vp[0]) / (vp[3] - vp[1]);
nuclear@1 96
nuclear@1 97 glMatrixMode(GL_PROJECTION);
nuclear@1 98 glPushMatrix();
nuclear@1 99 glLoadIdentity();
nuclear@1 100 glOrtho(0, 1, 1.0 / view_aspect, 0, -1, 1);
nuclear@1 101
nuclear@1 102 glMatrixMode(GL_MODELVIEW);
nuclear@1 103
nuclear@1 104 while(thumbs) {
nuclear@1 105
nuclear@1 106 glPushMatrix();
nuclear@1 107 glTranslatef(x, y, 0);
nuclear@1 108
nuclear@1 109 glScalef(thumb_sz, thumb_sz, 1);
nuclear@1 110
nuclear@1 111 glBegin(GL_QUADS);
nuclear@1 112 glColor3f(0.25, 0.25, 0.25);
nuclear@1 113 glTexCoord2f(0, 0); glVertex2f(0, 0);
nuclear@1 114 glTexCoord2f(1, 0); glVertex2f(1, 0);
nuclear@1 115 glTexCoord2f(1, 1); glVertex2f(1, 1);
nuclear@1 116 glTexCoord2f(0, 1); glVertex2f(0, 1);
nuclear@1 117 glEnd();
nuclear@1 118
nuclear@1 119 if(thumbs->aspect >= 1.0) {
nuclear@1 120 glTranslatef(0, 0.5 - 0.5 / thumbs->aspect, 0);
nuclear@1 121 glScalef(1, 1.0 / thumbs->aspect, 1);
nuclear@1 122 } else {
nuclear@1 123 glTranslatef(0.5 - thumbs->aspect / 2.0, 0, 0);
nuclear@1 124 glScalef(thumbs->aspect, 1, 1);
nuclear@1 125 }
nuclear@1 126
nuclear@1 127 glEnable(GL_TEXTURE_2D);
nuclear@1 128 glBindTexture(GL_TEXTURE_2D, thumbs->tex);
nuclear@1 129
nuclear@1 130 glBegin(GL_QUADS);
nuclear@1 131 glColor3f(1, 1, 1);
nuclear@1 132 glTexCoord2f(0, 0); glVertex2f(0, 0);
nuclear@1 133 glTexCoord2f(1, 0); glVertex2f(1, 0);
nuclear@1 134 glTexCoord2f(1, 1); glVertex2f(1, 1);
nuclear@1 135 glTexCoord2f(0, 1); glVertex2f(0, 1);
nuclear@1 136 glEnd();
nuclear@1 137
nuclear@1 138 glPopMatrix();
nuclear@1 139 glDisable(GL_TEXTURE_2D);
nuclear@1 140
nuclear@1 141 thumbs->layout_pos[0] = x;
nuclear@1 142 thumbs->layout_pos[1] = y;
nuclear@1 143 thumbs->layout_size[0] = thumb_sz;
nuclear@1 144 thumbs->layout_size[1] = thumb_sz;
nuclear@1 145
nuclear@1 146 x += thumb_sz + gap;
nuclear@1 147 if(x >= 1.0 - thumb_sz) {
nuclear@1 148 x = gap;
nuclear@1 149 y += thumb_sz + gap;
nuclear@1 150 }
nuclear@1 151
nuclear@1 152 thumbs = thumbs->next;
nuclear@1 153 }
nuclear@1 154
nuclear@1 155 glMatrixMode(GL_PROJECTION);
nuclear@1 156 glPopMatrix();
nuclear@1 157 glMatrixMode(GL_MODELVIEW);
nuclear@1 158 }