goat3dgfx

annotate examples/viewscn/src/main.cc @ 34:3eb6c8f89fe1

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author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 02 Mar 2014 17:41:10 +0200
parents 6f82b9b6d6c3
children
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@18 18 static float cam_theta, cam_phi, cam_dist = 8;
nuclear@16 19 static const char *scene_filename;
nuclear@16 20 static Scene *scn;
nuclear@16 21
nuclear@18 22 static ShaderProg *sdr;
nuclear@18 23
nuclear@16 24 int main(int argc, char **argv)
nuclear@16 25 {
nuclear@16 26 glutInit(&argc, argv);
nuclear@16 27 glutInitWindowSize(800, 600);
nuclear@16 28 glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
nuclear@16 29 glutCreateWindow("viewscn");
nuclear@16 30
nuclear@16 31 glutDisplayFunc(display);
nuclear@16 32 glutReshapeFunc(reshape);
nuclear@16 33 glutKeyboardFunc(keyboard);
nuclear@16 34 glutMouseFunc(mouse);
nuclear@16 35 glutMotionFunc(motion);
nuclear@16 36
nuclear@16 37 if(!parse_args(argc, argv)) {
nuclear@16 38 return 1;
nuclear@16 39 }
nuclear@16 40
nuclear@16 41 if(!init()) {
nuclear@16 42 return 1;
nuclear@16 43 }
nuclear@16 44 atexit(cleanup);
nuclear@16 45
nuclear@16 46 glutMainLoop();
nuclear@16 47 return 0;
nuclear@16 48 }
nuclear@16 49
nuclear@16 50 static bool init()
nuclear@16 51 {
nuclear@16 52 glewInit();
nuclear@16 53
nuclear@18 54 glClearColor(0.1, 0.1, 0.1, 1);
nuclear@18 55
nuclear@16 56 glEnable(GL_DEPTH_TEST);
nuclear@16 57 glEnable(GL_CULL_FACE);
nuclear@16 58
nuclear@18 59 if(!(sdr = get_sdrprog("sdr/foo.v.glsl", "sdr/foo.p.glsl"))) {
nuclear@18 60 return false;
nuclear@18 61 }
nuclear@18 62
nuclear@16 63 scn = new Scene;
nuclear@16 64 if(!scn->load(scene_filename)) {
nuclear@16 65 fatal_log("failed to load scene: %s\n", scene_filename);
nuclear@16 66 return false;
nuclear@16 67 }
nuclear@16 68
nuclear@16 69 return true;
nuclear@16 70 }
nuclear@16 71
nuclear@16 72 static void cleanup()
nuclear@16 73 {
nuclear@16 74 delete scn;
nuclear@16 75 }
nuclear@16 76
nuclear@16 77 static void display()
nuclear@16 78 {
nuclear@18 79 glClearColor(0.25, 0.25, 0.25, 1);
nuclear@16 80 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
nuclear@16 81
nuclear@16 82 Matrix4x4 view_matrix;
nuclear@18 83 view_matrix.translate(Vector3(0, 0, -cam_dist));
nuclear@16 84 view_matrix.rotate(Vector3(1, 0, 0), M_PI * cam_phi / 180.0);
nuclear@16 85 view_matrix.rotate(Vector3(0, 1, 0), M_PI * cam_theta / 180.0);
nuclear@16 86 set_view_matrix(view_matrix);
nuclear@16 87
nuclear@18 88 //setup_gl_matrices();
nuclear@16 89
nuclear@25 90 goatgfx::bind_shader(sdr);
nuclear@16 91 scn->draw();
nuclear@25 92 goatgfx::bind_shader(0);
nuclear@18 93
nuclear@18 94 /*glBegin(GL_QUADS);
nuclear@18 95 glColor3f(1, 1, 1);
nuclear@18 96 glVertex3f(-1, -1, 0);
nuclear@18 97 glVertex3f(1, -1, 0);
nuclear@18 98 glVertex3f(1, 1, 0);
nuclear@18 99 glVertex3f(-1, 1, 0);
nuclear@18 100 glEnd();*/
nuclear@16 101
nuclear@16 102 glutSwapBuffers();
nuclear@16 103 CHECKGLERR;
nuclear@16 104 }
nuclear@16 105
nuclear@16 106 static void reshape(int x, int y)
nuclear@16 107 {
nuclear@16 108 glViewport(0, 0, x, y);
nuclear@16 109
nuclear@16 110 Matrix4x4 proj;
nuclear@16 111 proj.set_perspective(M_PI / 4.0, (float)x / (float)y, 0.5, 500.0);
nuclear@16 112 set_projection_matrix(proj);
nuclear@16 113 }
nuclear@16 114
nuclear@16 115 static void keyboard(unsigned char key, int x, int y)
nuclear@16 116 {
nuclear@16 117 switch(key) {
nuclear@16 118 case 27:
nuclear@16 119 exit(0);
nuclear@16 120 }
nuclear@16 121 }
nuclear@16 122
nuclear@16 123 static bool bnstate[16];
nuclear@16 124 static int prev_x, prev_y;
nuclear@16 125
nuclear@16 126 static void mouse(int bn, int st, int x, int y)
nuclear@16 127 {
nuclear@16 128 bnstate[bn - GLUT_LEFT_BUTTON] = st == GLUT_DOWN;
nuclear@16 129 prev_x = x;
nuclear@16 130 prev_y = y;
nuclear@16 131 }
nuclear@16 132
nuclear@16 133 static void motion(int x, int y)
nuclear@16 134 {
nuclear@16 135 int dx = x - prev_x;
nuclear@16 136 int dy = y - prev_y;
nuclear@16 137 prev_x = x;
nuclear@16 138 prev_y = y;
nuclear@16 139
nuclear@16 140 if(!dx && !dy) return;
nuclear@16 141
nuclear@16 142 if(bnstate[0]) {
nuclear@16 143 cam_theta += dx * 0.5;
nuclear@16 144 cam_phi += dy * 0.5;
nuclear@16 145 cam_phi = std::max(-90.0f, std::min(90.0f, cam_phi));
nuclear@16 146 glutPostRedisplay();
nuclear@16 147 }
nuclear@16 148 }
nuclear@16 149
nuclear@16 150 static bool parse_args(int argc, char **argv)
nuclear@16 151 {
nuclear@16 152 for(int i=1; i<argc; i++) {
nuclear@16 153 if(argv[i][0] == '-' && argv[i][2] == 0) {
nuclear@16 154 switch(argv[i][1]) {
nuclear@16 155 case 'h':
nuclear@16 156 default:
nuclear@16 157 printf("usage: %s <filename>\n", argv[i]);
nuclear@16 158 exit(0);
nuclear@16 159 }
nuclear@16 160 } else {
nuclear@16 161 if(scene_filename) {
nuclear@16 162 fprintf(stderr, "unexpected argument: %s\n", argv[i]);
nuclear@16 163 return false;
nuclear@16 164 }
nuclear@16 165 scene_filename = argv[i];
nuclear@16 166 }
nuclear@16 167 }
nuclear@16 168
nuclear@16 169 if(!scene_filename) {
nuclear@16 170 fprintf(stderr, "you must specify the scene file to view\n");
nuclear@16 171 return false;
nuclear@16 172 }
nuclear@16 173
nuclear@16 174 return true;
nuclear@16 175 }