libresman: 410c19c735b2 examples/imgthumbs/src/main.c

libresman

view examples/imgthumbs/src/main.c @ 6:410c19c735b2

- removed the glew dependency - initial thread pool implementation

author	John Tsiombikas <nuclear@member.fsf.org>
date	Mon, 03 Feb 2014 05:22:09 +0200
parents	eadf99551730
children	bebc065a941f

line source

1 #include <stdio.h>

2 #include <stdlib.h>

3 #include <assert.h>

4 #include "opengl.h"

5 #include "resman.h"

6 #include "thumbs.h"

8 static int init(void);

9 static void cleanup(void);

10 static void display(void);

11 /*static void idle(void);*/

12 static void reshape(int x, int y);

13 static void keyb(unsigned char key, int x, int y);

14 static void mouse(int bn, int st, int x, int y);

15 static void motion(int x, int y);

16 static void sball_motion(int x, int y, int z);

17 static struct thumbnail *find_thumb(int x, int y);

19 const char *path = ".";

20 struct resman *texman;

21 int win_width, win_height;

22 float win_aspect;

23 float pan_x, pan_y;

24 float show_pan_x, show_pan_y;

25 float show_zoom = 1.0;

26 float thumbs_size = 0.25;

28 struct thumbnail *thumbs, *show_thumb;

30 int main(int argc, char **argv)

31 {

32 glutInitWindowSize(1024, 768);

33 glutInit(&argc, argv);

35 if(argv[1]) {

36 path = argv[1];

37 }

39 glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);

40 glutCreateWindow("imgthumbs");

42 glutDisplayFunc(display);

43 glutReshapeFunc(reshape);

44 glutKeyboardFunc(keyb);

45 glutMouseFunc(mouse);

46 glutMotionFunc(motion);

47 glutSpaceballMotionFunc(sball_motion);

49 if(init() == -1) {

50 return 1;

51 }

52 atexit(cleanup);

54 glutMainLoop();

55 return 0;

56 }

58 static int init(void)

59 {

60 thumbs = create_thumbs(path);

61 return 0;

62 }

64 static void cleanup(void)

65 {

66 free_thumbs(thumbs);

67 }

69 static void display(void)

70 {

71 glClear(GL_COLOR_BUFFER_BIT);

73 glMatrixMode(GL_MODELVIEW);

74 glLoadIdentity();

76 if(show_thumb) {

77 glEnable(GL_TEXTURE_2D);

78 glBindTexture(GL_TEXTURE_2D, show_thumb->tex);

80 glScalef(show_zoom, show_zoom, 1);

81 glTranslatef(2.0 * show_pan_x, 2.0 * show_pan_y, 0);

82 if(show_thumb->aspect >= win_aspect) {

83 glScalef(1, 1.0 / show_thumb->aspect, 1);

84 } else {

85 glScalef(show_thumb->aspect / win_aspect, 1.0 / win_aspect, 1);

86 }

88 glBegin(GL_QUADS);

89 glColor3f(1, 1, 1);

90 glTexCoord2f(0, 0); glVertex2f(-1, -1);

91 glTexCoord2f(1, 0); glVertex2f(1, -1);

92 glTexCoord2f(1, 1); glVertex2f(1, 1);

93 glTexCoord2f(0, 1); glVertex2f(-1, 1);

94 glEnd();

96 glDisable(GL_TEXTURE_2D);

97 } else {

98 draw_thumbs(thumbs, thumbs_size, pan_y);

99 }

100

101 glutSwapBuffers();

102 assert(glGetError() == GL_NO_ERROR);

103 }

104

105 /*

106 static void idle(void)

107 {

108 glutPostRedisplay();

109 }

110 */

111

112 static void reshape(int x, int y)

113 {

114 win_aspect = (float)x / (float)y;

115

116 glViewport(0, 0, x, y);

117

118 glMatrixMode(GL_PROJECTION);

119 glLoadIdentity();

120 glOrtho(-1, 1, 1.0 / win_aspect, -1.0 / win_aspect, -1, 1);

121

122 win_width = x;

123 win_height = y;

124 }

125

126 static void keyb(unsigned char key, int x, int y)

127 {

128 switch(key) {

129 case 27:

130 if(show_thumb) {

131 show_thumb = 0;

132 glutPostRedisplay();

133 } else {

134 exit(0);

135 }

136 break;

137

138 case ' ':

139 show_zoom = 1.0;

140 thumbs_size = 0.25;

141 pan_x = pan_y = show_pan_x = show_pan_y = 0;

142 glutPostRedisplay();

143 break;

144 }

145 }

146

147 static int bnstate[32];

148 static int prev_x, prev_y;

149 static int click_x[32], click_y[32];

150

151 static void mouse(int bn, int st, int x, int y)

152 {

153 int bidx = bn - GLUT_LEFT_BUTTON;

154 int state = st == GLUT_DOWN ? 1 : 0;

155

156 bnstate[bidx] = state;

157

158 prev_x = x;

159 prev_y = y;

160

161 if(state) {

162 click_x[bidx] = x;

163 click_y[bidx] = y;

164 } else {

165 int is_drag = abs(x - click_x[bidx]) > 3 || abs(y - click_y[bidx]) > 3;

166

167 if(bidx == 0) {

168 if(!show_thumb) {

169 if(!is_drag) {

170 struct thumbnail *sel = find_thumb(x, y);

171 if(sel) {

172 show_thumb = sel;

173 show_pan_x = show_pan_y = 0;

174 glutPostRedisplay();

175 }

176 }

177 }

178 } else {

179 if(!is_drag) {

180 show_thumb = 0;

181 glutPostRedisplay();

182 }

183 }

184 }

185 }

186

187 static void motion(int x, int y)

188 {

189 int dx = x - prev_x;

190 int dy = y - prev_y;

191 prev_x = x;

192 prev_y = y;

193

194 if(!dx && !dy) return;

195

196 if(bnstate[0]) {

197 float fdx = dx / (float)win_width;

198 float fdy = dy / (float)win_height / win_aspect;

199

200 if(show_thumb) {

201 show_pan_x += fdx / show_zoom;

202 show_pan_y += fdy / show_zoom;

203 } else {

204 pan_x += fdx;

205 pan_y += fdy;

206 }

207 glutPostRedisplay();

208 }

209

210 if(bnstate[2]) {

211 if(show_thumb) {

212 show_zoom -= dy * 0.0075;

213 if(show_zoom <= 0) show_zoom = 0;

214 } else {

215 thumbs_size -= dy * 0.005;

216 if(thumbs_size <= 0.01) thumbs_size = 0.01;

217 }

218 glutPostRedisplay();

219 }

220 }

221

222 static void sball_motion(int x, int y, int z)

223 {

224 float fx = -x * 0.0004;

225 float fy = z * 0.0004;

226 float fz = -y * 0.0005;

227

228 if(show_thumb) {

229 show_pan_x += fx / show_zoom;

230 show_pan_y += fy / show_zoom;

231 show_zoom += fz;

232 if(show_zoom <= 0) show_zoom = 0;

233 } else {

234 pan_x += fx;

235 pan_y += fy;

236 thumbs_size += fz;

237 if(thumbs_size <= 0.01) thumbs_size = 0.01;

238 }

239 glutPostRedisplay();

240 }

241

242 static struct thumbnail *find_thumb(int x, int y)

243 {

244 float fx = (float)x / (float)win_width;

245 float fy = (float)y / (float)win_height / win_aspect;

246 struct thumbnail *node;

247

248 node = thumbs;

249 while(node) {

250 float nx = node->layout_pos[0];

251 float ny = node->layout_pos[1];

252

253 if(fx >= nx && fx < nx + node->layout_size[0] &&

254 fy >= ny && fy < ny + node->layout_size[1]) {

255 return node;

256 }

257 node = node->next;

258 }

259 return 0;

260 }