goat3dgfx

annotate examples/viewscn/src/main.cc @ 16:f61cc1df533c

find changesets by author, revision, files, or words in the commit message
added viewscn example (under dev)
author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 30 Nov 2013 20:53:26 +0200
parents
children 6f82b9b6d6c3
rev   line source
nuclear@16 1 #include <stdio.h>
nuclear@16 2 #include <stdlib.h>
nuclear@16 3 #include <algorithm>
nuclear@16 4 #include <goat3dgfx/goat3dgfx.h>
nuclear@16 5 #include <vmath/vmath.h>
nuclear@16 6
nuclear@16 7 using namespace goatgfx;
nuclear@16 8
nuclear@16 9 static bool init();
nuclear@16 10 static void cleanup();
nuclear@16 11 static void display();
nuclear@16 12 static void reshape(int x, int y);
nuclear@16 13 static void keyboard(unsigned char key, int x, int y);
nuclear@16 14 static void mouse(int bn, int st, int x, int y);
nuclear@16 15 static void motion(int x, int y);
nuclear@16 16 static bool parse_args(int argc, char **argv);
nuclear@16 17
nuclear@16 18 static float cam_theta, cam_phi;
nuclear@16 19 static const char *scene_filename;
nuclear@16 20 static Scene *scn;
nuclear@16 21
nuclear@16 22 int main(int argc, char **argv)
nuclear@16 23 {
nuclear@16 24 glutInit(&argc, argv);
nuclear@16 25 glutInitWindowSize(800, 600);
nuclear@16 26 glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
nuclear@16 27 glutCreateWindow("viewscn");
nuclear@16 28
nuclear@16 29 glutDisplayFunc(display);
nuclear@16 30 glutReshapeFunc(reshape);
nuclear@16 31 glutKeyboardFunc(keyboard);
nuclear@16 32 glutMouseFunc(mouse);
nuclear@16 33 glutMotionFunc(motion);
nuclear@16 34
nuclear@16 35 if(!parse_args(argc, argv)) {
nuclear@16 36 return 1;
nuclear@16 37 }
nuclear@16 38
nuclear@16 39 if(!init()) {
nuclear@16 40 return 1;
nuclear@16 41 }
nuclear@16 42 atexit(cleanup);
nuclear@16 43
nuclear@16 44 glutMainLoop();
nuclear@16 45 return 0;
nuclear@16 46 }
nuclear@16 47
nuclear@16 48 static bool init()
nuclear@16 49 {
nuclear@16 50 glewInit();
nuclear@16 51
nuclear@16 52 glEnable(GL_DEPTH_TEST);
nuclear@16 53 glEnable(GL_CULL_FACE);
nuclear@16 54
nuclear@16 55 scn = new Scene;
nuclear@16 56 if(!scn->load(scene_filename)) {
nuclear@16 57 fatal_log("failed to load scene: %s\n", scene_filename);
nuclear@16 58 return false;
nuclear@16 59 }
nuclear@16 60
nuclear@16 61 return true;
nuclear@16 62 }
nuclear@16 63
nuclear@16 64 static void cleanup()
nuclear@16 65 {
nuclear@16 66 delete scn;
nuclear@16 67 }
nuclear@16 68
nuclear@16 69 static void display()
nuclear@16 70 {
nuclear@16 71 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
nuclear@16 72
nuclear@16 73 Matrix4x4 view_matrix;
nuclear@16 74 view_matrix.rotate(Vector3(1, 0, 0), M_PI * cam_phi / 180.0);
nuclear@16 75 view_matrix.rotate(Vector3(0, 1, 0), M_PI * cam_theta / 180.0);
nuclear@16 76 set_view_matrix(view_matrix);
nuclear@16 77
nuclear@16 78 setup_gl_matrices();
nuclear@16 79
nuclear@16 80 scn->draw();
nuclear@16 81
nuclear@16 82 glutSwapBuffers();
nuclear@16 83 CHECKGLERR;
nuclear@16 84 }
nuclear@16 85
nuclear@16 86 static void reshape(int x, int y)
nuclear@16 87 {
nuclear@16 88 glViewport(0, 0, x, y);
nuclear@16 89
nuclear@16 90 Matrix4x4 proj;
nuclear@16 91 proj.set_perspective(M_PI / 4.0, (float)x / (float)y, 0.5, 500.0);
nuclear@16 92 set_projection_matrix(proj);
nuclear@16 93 }
nuclear@16 94
nuclear@16 95 static void keyboard(unsigned char key, int x, int y)
nuclear@16 96 {
nuclear@16 97 switch(key) {
nuclear@16 98 case 27:
nuclear@16 99 exit(0);
nuclear@16 100 }
nuclear@16 101 }
nuclear@16 102
nuclear@16 103 static bool bnstate[16];
nuclear@16 104 static int prev_x, prev_y;
nuclear@16 105
nuclear@16 106 static void mouse(int bn, int st, int x, int y)
nuclear@16 107 {
nuclear@16 108 bnstate[bn - GLUT_LEFT_BUTTON] = st == GLUT_DOWN;
nuclear@16 109 prev_x = x;
nuclear@16 110 prev_y = y;
nuclear@16 111 }
nuclear@16 112
nuclear@16 113 static void motion(int x, int y)
nuclear@16 114 {
nuclear@16 115 int dx = x - prev_x;
nuclear@16 116 int dy = y - prev_y;
nuclear@16 117 prev_x = x;
nuclear@16 118 prev_y = y;
nuclear@16 119
nuclear@16 120 if(!dx && !dy) return;
nuclear@16 121
nuclear@16 122 if(bnstate[0]) {
nuclear@16 123 cam_theta += dx * 0.5;
nuclear@16 124 cam_phi += dy * 0.5;
nuclear@16 125 cam_phi = std::max(-90.0f, std::min(90.0f, cam_phi));
nuclear@16 126 glutPostRedisplay();
nuclear@16 127 }
nuclear@16 128 }
nuclear@16 129
nuclear@16 130 static bool parse_args(int argc, char **argv)
nuclear@16 131 {
nuclear@16 132 for(int i=1; i<argc; i++) {
nuclear@16 133 if(argv[i][0] == '-' && argv[i][2] == 0) {
nuclear@16 134 switch(argv[i][1]) {
nuclear@16 135 case 'h':
nuclear@16 136 default:
nuclear@16 137 printf("usage: %s <filename>\n", argv[i]);
nuclear@16 138 exit(0);
nuclear@16 139 }
nuclear@16 140 } else {
nuclear@16 141 if(scene_filename) {
nuclear@16 142 fprintf(stderr, "unexpected argument: %s\n", argv[i]);
nuclear@16 143 return false;
nuclear@16 144 }
nuclear@16 145 scene_filename = argv[i];
nuclear@16 146 }
nuclear@16 147 }
nuclear@16 148
nuclear@16 149 if(!scene_filename) {
nuclear@16 150 fprintf(stderr, "you must specify the scene file to view\n");
nuclear@16 151 return false;
nuclear@16 152 }
nuclear@16 153
nuclear@16 154 return true;
nuclear@16 155 }