libresman: 174ddb6bf92a examples/imgthumbs/src/thumbs.c

libresman

view examples/imgthumbs/src/thumbs.c @ 22:174ddb6bf92a

separated platform-specific filewatch code

author	John Tsiombikas <nuclear@member.fsf.org>
date	Wed, 12 Feb 2014 22:32:30 +0200
parents	c6073bf9fd38
children

line source

1 #include <stdio.h>

2 #include <stdlib.h>

3 #include <string.h>

4 #include <errno.h>

5 #include <assert.h>

6 #include <dirent.h>

7 #include <imago2.h>

8 #include "opengl.h"

9 #include "thumbs.h"

10 #include "resman.h"

12 static int load_res_texture(const char *fname, int id, void *cls);

13 static int done_res_texture(int id, void *cls);

14 static void free_res_texture(int id, void *cls);

16 struct resman *texman;

17 int dbg_load_async = 1;

19 struct thumbnail *create_thumbs(const char *dirpath)

20 {

21 DIR *dir;

22 struct dirent *dent;

23 /* allocate dummy head node */

24 struct thumbnail *list = calloc(1, sizeof *list);

25 char *env;

27 if((env = getenv("RESMAN_LOAD_ASYNC"))) {

28 dbg_load_async = atoi(env);

29 }

31 if(!texman) {

32 texman = resman_create();

33 resman_set_load_func(texman, load_res_texture, 0);

34 resman_set_done_func(texman, done_res_texture, 0);

35 resman_set_destroy_func(texman, free_res_texture, 0);

36 }

38 if(!(dir = opendir(dirpath))) {

39 fprintf(stderr, "failed to open directory: %s: %s\n", dirpath, strerror(errno));

40 return 0;

41 }

43 while((dent = readdir(dir))) {

44 struct img_pixmap img;

45 struct thumbnail *node;

47 if(!(node = malloc(sizeof *node))) {

48 perror("failed to allocate thumbnail list node");

49 continue;

50 }

51 memset(node, 0, sizeof *node);

53 if(!(node->fname = malloc(strlen(dirpath) + strlen(dent->d_name) + 2))) {

54 free(node);

55 continue;

56 }

57 strcpy(node->fname, dirpath);

58 if(dirpath[strlen(dirpath) - 1] != '/') {

59 strcat(node->fname, "/");

60 }

61 strcat(node->fname, dent->d_name);

63 node->aspect = 1.0;

65 if(dbg_load_async) {

66 resman_lookup(texman, node->fname, node);

67 } else {

68 img_init(&img);

69 if(img_load(&img, node->fname) == -1) {

70 img_destroy(&img);

71 free(node->fname);

72 free(node);

73 continue;

74 }

76 printf("loaded image: %s\n", node->fname);

78 node->aspect = (float)img.width / (float)img.height;

80 glGenTextures(1, &node->tex);

81 glBindTexture(GL_TEXTURE_2D, node->tex);

82 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

83 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

84 glTexImage2D(GL_TEXTURE_2D, 0, img_glintfmt(&img), img.width, img.height, 0, img_glfmt(&img), img_gltype(&img), img.pixels);

85 img_destroy(&img);

87 node->prev = list;

88 node->next = list->next;

89 if(list->next) list->next->prev = node;

90 list->next = node;

91 }

92 node->list = list;

93 node->load_count = 0;

94 }

95 closedir(dir);

97 return list;

98 }

100 void free_thumbs(struct thumbnail *thumbs)

101 {

102 if(!thumbs) return;

103

104 while(thumbs) {

105 struct thumbnail *tmp = thumbs;

106 thumbs = thumbs->next;

107

108 free(tmp->fname);

109 free(tmp);

110 }

111 }

112

113

114 void update_thumbs(void)

115 {

116 resman_poll(texman);

117 }

118

119 void draw_thumbs(struct thumbnail *thumbs, float thumb_sz, float start_y)

120 {

121 int vp[4];

122 float gap = thumb_sz / 4.0;

123 float x = gap;

124 float y = gap + start_y;

125 float view_aspect;

126

127 glGetIntegerv(GL_VIEWPORT, vp);

128 view_aspect = (float)(vp[2] - vp[0]) / (float)(vp[3] - vp[1]);

129

130 glMatrixMode(GL_PROJECTION);

131 glPushMatrix();

132 glLoadIdentity();

133 glOrtho(0, 1, 1.0 / view_aspect, 0, -1, 1);

134

135 glMatrixMode(GL_MODELVIEW);

136

137 thumbs = thumbs->next; /* skip dummy node */

138 while(thumbs) {

139 glPushMatrix();

140 glTranslatef(x, y, 0);

141

142 glScalef(thumb_sz, thumb_sz, 1);

143

144 glBegin(GL_QUADS);

145 glColor3f(0.25, 0.25, 0.25);

146 glTexCoord2f(0, 0); glVertex2f(0, 0);

147 glTexCoord2f(1, 0); glVertex2f(1, 0);

148 glTexCoord2f(1, 1); glVertex2f(1, 1);

149 glTexCoord2f(0, 1); glVertex2f(0, 1);

150 glEnd();

151

152 if(thumbs->tex) {

153 if(thumbs->aspect >= 1.0) {

154 glTranslatef(0, 0.5 - 0.5 / thumbs->aspect, 0);

155 glScalef(1, 1.0 / thumbs->aspect, 1);

156 } else {

157 glTranslatef(0.5 - thumbs->aspect / 2.0, 0, 0);

158 glScalef(thumbs->aspect, 1, 1);

159 }

160

161 if(glIsTexture(thumbs->tex)) {

162 glEnable(GL_TEXTURE_2D);

163 glBindTexture(GL_TEXTURE_2D, thumbs->tex);

164

165 glBegin(GL_QUADS);

166 glColor3f(1, 1, 1);

167 glTexCoord2f(0, 0); glVertex2f(0, 0);

168 glTexCoord2f(1, 0); glVertex2f(1, 0);

169 glTexCoord2f(1, 1); glVertex2f(1, 1);

170 glTexCoord2f(0, 1); glVertex2f(0, 1);

171 glEnd();

172 } else {

173 fprintf(stderr, "invalid texture: %u\n", thumbs->tex);

174 }

175

176 glPopMatrix();

177 glDisable(GL_TEXTURE_2D);

178 }

179

180 thumbs->layout_pos[0] = x;

181 thumbs->layout_pos[1] = y;

182 thumbs->layout_size[0] = thumb_sz;

183 thumbs->layout_size[1] = thumb_sz;

184

185 x += thumb_sz + gap;

186 if(x >= 1.0 - thumb_sz) {

187 x = gap;

188 y += thumb_sz + gap;

189 }

190

191 thumbs = thumbs->next;

192 }

193

194 glMatrixMode(GL_PROJECTION);

195 glPopMatrix();

196 glMatrixMode(GL_MODELVIEW);

197 }

198

199 static int load_res_texture(const char *fname, int id, void *cls)

200 {

201 struct thumbnail *rdata = resman_get_res_data(texman, id);

202

203 assert(rdata);

204 if(!rdata->img) {

205 if(!(rdata->img = img_create())) {

206 return -1;

207 }

208 }

209

210 if(img_load(rdata->img, fname) == -1) {

211 img_free(rdata->img);

212 rdata->img = 0;

213 return -1;

214 }

215 rdata->aspect = (float)rdata->img->width / (float)rdata->img->height;

216

217 /* set the resource's data to the loaded image, so that we can use

218 * it in the done callback */

219 resman_set_res_data(texman, id, rdata);

220 return 0;

221 }

222

223 static int done_res_texture(int id, void *cls)

224 {

225 struct thumbnail *thumb = resman_get_res_data(texman, id);

226 int load_result = resman_get_res_result(texman, id);

227

228 if(load_result == -1) {

229 /* returning -1 will remove this resource, the free_res_texture

230 * destroy handler will be called, which will remove the node

231 * from the list

232 */

233 return -1;

234 }

235

236 if(resman_get_res_result(texman, id) != 0 || !thumb) {

237 fprintf(stderr, "failed to load resource %d (%s)\n", id, resman_get_res_name(texman, id));

238 } else {

239 printf("done loading resource %d (%s)\n", id, resman_get_res_name(texman, id));

240 }

241

242 if(!thumb->tex) {

243 glGenTextures(1, &thumb->tex);

244 }

245 glBindTexture(GL_TEXTURE_2D, thumb->tex);

246 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

247 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

248 glTexImage2D(GL_TEXTURE_2D, 0, img_glintfmt(thumb->img),

249 thumb->img->width, thumb->img->height, 0, img_glfmt(thumb->img),

250 img_gltype(thumb->img), thumb->img->pixels);

251

252 /* and add it to the list of thumbnails (if it's the first loading) */

253 if(resman_get_res_load_count(texman, id) == 0) {

254 thumb->prev = thumb->list;

255 thumb->next = thumb->list->next;

256 if(thumb->list->next) thumb->list->next->prev = thumb;

257 thumb->list->next = thumb;

258 }

259 return 0;

260 }

261

262 static void free_res_texture(int id, void *cls)

263 {

264 struct thumbnail *thumb = resman_get_res_data(texman, id);

265

266 printf("deleting thumb %d: %s\n", id, thumb->fname);

267

268 if(thumb) {

269 if(thumb->tex) {

270 glDeleteTextures(1, &thumb->tex);

271 }

272 if(thumb->img) {

273 img_free(thumb->img);

274 }

275 }

276

277 /* remove from the list */

278 if(thumb->prev) {

279 thumb->prev->next = thumb->next;

280 }

281 if(thumb->next) {

282 thumb->next->prev = thumb->prev;

283 }

284 free(thumb);

285 }