libresman

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

find changesets by author, revision, files, or words in the commit message
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 a396d43a62f9
rev   line source
nuclear@1 1 #include <stdio.h>
nuclear@1 2 #include <stdlib.h>
nuclear@1 3 #include <assert.h>
nuclear@1 4 #include "opengl.h"
nuclear@1 5 #include "resman.h"
nuclear@1 6 #include "thumbs.h"
nuclear@1 7
nuclear@1 8 static int init(void);
nuclear@1 9 static void cleanup(void);
nuclear@1 10 static void display(void);
nuclear@1 11 /*static void idle(void);*/
nuclear@1 12 static void reshape(int x, int y);
nuclear@1 13 static void keyb(unsigned char key, int x, int y);
nuclear@1 14 static void mouse(int bn, int st, int x, int y);
nuclear@1 15 static void motion(int x, int y);
nuclear@2 16 static void sball_motion(int x, int y, int z);
nuclear@1 17 static struct thumbnail *find_thumb(int x, int y);
nuclear@1 18
nuclear@1 19 const char *path = ".";
nuclear@1 20 struct resman *texman;
nuclear@1 21 int win_width, win_height;
nuclear@1 22 float win_aspect;
nuclear@1 23 float pan_x, pan_y;
nuclear@1 24 float show_pan_x, show_pan_y;
nuclear@1 25 float show_zoom = 1.0;
nuclear@1 26 float thumbs_size = 0.25;
nuclear@1 27
nuclear@1 28 struct thumbnail *thumbs, *show_thumb;
nuclear@1 29
nuclear@1 30 int main(int argc, char **argv)
nuclear@1 31 {
nuclear@1 32 glutInit(&argc, argv);
nuclear@1 33
nuclear@1 34 if(argv[1]) {
nuclear@1 35 path = argv[1];
nuclear@1 36 }
nuclear@1 37
nuclear@1 38 glutInitWindowSize(800, 600);
nuclear@1 39 glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
nuclear@1 40 glutCreateWindow("imgthumbs");
nuclear@1 41
nuclear@1 42 glutDisplayFunc(display);
nuclear@1 43 glutReshapeFunc(reshape);
nuclear@1 44 glutKeyboardFunc(keyb);
nuclear@1 45 glutMouseFunc(mouse);
nuclear@1 46 glutMotionFunc(motion);
nuclear@2 47 glutSpaceballMotionFunc(sball_motion);
nuclear@1 48
nuclear@1 49 if(init() == -1) {
nuclear@1 50 return 1;
nuclear@1 51 }
nuclear@1 52 atexit(cleanup);
nuclear@1 53
nuclear@1 54 glutMainLoop();
nuclear@1 55 return 0;
nuclear@1 56 }
nuclear@1 57
nuclear@1 58 static int init(void)
nuclear@1 59 {
nuclear@2 60 glewInit();
nuclear@2 61
nuclear@1 62 thumbs = create_thumbs(path);
nuclear@1 63 return 0;
nuclear@1 64 }
nuclear@1 65
nuclear@1 66 static void cleanup(void)
nuclear@1 67 {
nuclear@1 68 free_thumbs(thumbs);
nuclear@1 69 }
nuclear@1 70
nuclear@1 71 static void display(void)
nuclear@1 72 {
nuclear@1 73 glClear(GL_COLOR_BUFFER_BIT);
nuclear@1 74
nuclear@1 75 glMatrixMode(GL_MODELVIEW);
nuclear@1 76 glLoadIdentity();
nuclear@1 77
nuclear@1 78 if(show_thumb) {
nuclear@1 79 glEnable(GL_TEXTURE_2D);
nuclear@1 80 glBindTexture(GL_TEXTURE_2D, show_thumb->tex);
nuclear@1 81
nuclear@1 82 glScalef(show_zoom, show_zoom, 1);
nuclear@1 83 glTranslatef(2.0 * show_pan_x, 2.0 * show_pan_y, 0);
nuclear@1 84 if(show_thumb->aspect >= 1.0) {
nuclear@1 85 glScalef(1, 1.0 / show_thumb->aspect, 1);
nuclear@1 86 } else {
nuclear@1 87 glScalef(show_thumb->aspect, 1, 1);
nuclear@1 88 }
nuclear@1 89
nuclear@1 90 glBegin(GL_QUADS);
nuclear@1 91 glColor3f(1, 1, 1);
nuclear@1 92 glTexCoord2f(0, 0); glVertex2f(-1, -1);
nuclear@1 93 glTexCoord2f(1, 0); glVertex2f(1, -1);
nuclear@1 94 glTexCoord2f(1, 1); glVertex2f(1, 1);
nuclear@1 95 glTexCoord2f(0, 1); glVertex2f(-1, 1);
nuclear@1 96 glEnd();
nuclear@1 97
nuclear@1 98 glDisable(GL_TEXTURE_2D);
nuclear@1 99 } else {
nuclear@1 100 draw_thumbs(thumbs, thumbs_size, pan_y);
nuclear@1 101 }
nuclear@1 102
nuclear@1 103 glutSwapBuffers();
nuclear@1 104 assert(glGetError() == GL_NO_ERROR);
nuclear@1 105 }
nuclear@1 106
nuclear@1 107 /*
nuclear@1 108 static void idle(void)
nuclear@1 109 {
nuclear@1 110 glutPostRedisplay();
nuclear@1 111 }
nuclear@1 112 */
nuclear@1 113
nuclear@1 114 static void reshape(int x, int y)
nuclear@1 115 {
nuclear@1 116 win_aspect = (float)x / (float)y;
nuclear@1 117
nuclear@1 118 glViewport(0, 0, x, y);
nuclear@1 119
nuclear@1 120 glMatrixMode(GL_PROJECTION);
nuclear@1 121 glLoadIdentity();
nuclear@1 122 glOrtho(-1, 1, 1.0 / win_aspect, -1.0 / win_aspect, -1, 1);
nuclear@1 123
nuclear@1 124 win_width = x;
nuclear@1 125 win_height = y;
nuclear@1 126 }
nuclear@1 127
nuclear@1 128 static void keyb(unsigned char key, int x, int y)
nuclear@1 129 {
nuclear@1 130 switch(key) {
nuclear@1 131 case 27:
nuclear@1 132 exit(0);
nuclear@1 133
nuclear@1 134 case ' ':
nuclear@1 135 show_zoom = 1.0;
nuclear@1 136 thumbs_size = 0.25;
nuclear@1 137 pan_x = pan_y = show_pan_x = show_pan_y = 0;
nuclear@1 138 glutPostRedisplay();
nuclear@1 139 break;
nuclear@1 140 }
nuclear@1 141 }
nuclear@1 142
nuclear@1 143 static int bnstate[32];
nuclear@1 144 static int prev_x, prev_y;
nuclear@1 145 static int click_x[32], click_y[32];
nuclear@1 146
nuclear@1 147 static void mouse(int bn, int st, int x, int y)
nuclear@1 148 {
nuclear@1 149 int bidx = bn - GLUT_LEFT_BUTTON;
nuclear@1 150 int state = st == GLUT_DOWN ? 1 : 0;
nuclear@1 151
nuclear@1 152 bnstate[bidx] = state;
nuclear@1 153
nuclear@1 154 prev_x = x;
nuclear@1 155 prev_y = y;
nuclear@1 156
nuclear@1 157 if(state) {
nuclear@1 158 click_x[bidx] = x;
nuclear@1 159 click_y[bidx] = y;
nuclear@1 160 } else {
nuclear@1 161 int is_drag = abs(x - click_x[bidx]) > 3 || abs(y - click_y[bidx]) > 3;
nuclear@1 162
nuclear@1 163 if(bidx == 0) {
nuclear@1 164 if(!show_thumb) {
nuclear@1 165 if(!is_drag) {
nuclear@1 166 struct thumbnail *sel = find_thumb(x, y);
nuclear@1 167 if(sel) {
nuclear@1 168 show_thumb = sel;
nuclear@1 169 show_pan_x = show_pan_y = 0;
nuclear@1 170 glutPostRedisplay();
nuclear@1 171 }
nuclear@1 172 }
nuclear@1 173 }
nuclear@1 174 } else {
nuclear@1 175 if(!is_drag) {
nuclear@1 176 show_thumb = 0;
nuclear@1 177 glutPostRedisplay();
nuclear@1 178 }
nuclear@1 179 }
nuclear@1 180 }
nuclear@1 181 }
nuclear@1 182
nuclear@1 183 static void motion(int x, int y)
nuclear@1 184 {
nuclear@1 185 int dx = x - prev_x;
nuclear@1 186 int dy = y - prev_y;
nuclear@1 187 prev_x = x;
nuclear@1 188 prev_y = y;
nuclear@1 189
nuclear@1 190 if(!dx && !dy) return;
nuclear@1 191
nuclear@1 192 if(bnstate[0]) {
nuclear@1 193 float fdx = dx / (float)win_width;
nuclear@1 194 float fdy = dy / (float)win_height / win_aspect;
nuclear@1 195
nuclear@1 196 if(show_thumb) {
nuclear@1 197 show_pan_x += fdx / show_zoom;
nuclear@1 198 show_pan_y += fdy / show_zoom;
nuclear@1 199 } else {
nuclear@1 200 pan_x += fdx;
nuclear@1 201 pan_y += fdy;
nuclear@1 202 }
nuclear@1 203 glutPostRedisplay();
nuclear@1 204 }
nuclear@1 205
nuclear@1 206 if(bnstate[2]) {
nuclear@1 207 if(show_thumb) {
nuclear@1 208 show_zoom -= dy * 0.0075;
nuclear@1 209 if(show_zoom <= 0) show_zoom = 0;
nuclear@1 210 } else {
nuclear@1 211 thumbs_size -= dy * 0.005;
nuclear@1 212 if(thumbs_size <= 0.01) thumbs_size = 0.01;
nuclear@1 213 }
nuclear@1 214 glutPostRedisplay();
nuclear@1 215 }
nuclear@1 216 }
nuclear@1 217
nuclear@2 218 static void sball_motion(int x, int y, int z)
nuclear@2 219 {
nuclear@2 220 float fx = -x * 0.0004;
nuclear@2 221 float fy = z * 0.0004;
nuclear@2 222 float fz = -y * 0.0005;
nuclear@2 223
nuclear@2 224 if(show_thumb) {
nuclear@2 225 show_pan_x += fx / show_zoom;
nuclear@2 226 show_pan_y += fy / show_zoom;
nuclear@2 227 show_zoom += fz;
nuclear@2 228 if(show_zoom <= 0) show_zoom = 0;
nuclear@2 229 } else {
nuclear@2 230 pan_x += fx;
nuclear@2 231 pan_y += fy;
nuclear@2 232 thumbs_size += fz;
nuclear@2 233 if(thumbs_size <= 0.01) thumbs_size = 0.01;
nuclear@2 234 }
nuclear@2 235 glutPostRedisplay();
nuclear@2 236 }
nuclear@2 237
nuclear@1 238 static struct thumbnail *find_thumb(int x, int y)
nuclear@1 239 {
nuclear@1 240 float fx = (float)x / (float)win_width;
nuclear@1 241 float fy = (float)y / (float)win_height / win_aspect;
nuclear@1 242 struct thumbnail *node;
nuclear@1 243
nuclear@1 244 node = thumbs;
nuclear@1 245 while(node) {
nuclear@1 246 float nx = node->layout_pos[0];
nuclear@1 247 float ny = node->layout_pos[1];
nuclear@1 248
nuclear@1 249 if(fx >= nx && fx < nx + node->layout_size[0] &&
nuclear@1 250 fy >= ny && fy < ny + node->layout_size[1]) {
nuclear@1 251 return node;
nuclear@1 252 }
nuclear@1 253 node = node->next;
nuclear@1 254 }
nuclear@1 255 return 0;
nuclear@1 256 }