178 lines
3.6 KiB
C
178 lines
3.6 KiB
C
/* Spaceball demo
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*
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* Written by John Tsiombikas <nuclear@member.fsf.org>
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* (converted from the libspnav cube example)
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*
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* Use the spaceball to move and rotate the colored cube.
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* Pressing any button will reset the cube at its original location.
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*
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* Press escape or q to exit.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <GL/freeglut.h>
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#include "vmath.h"
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#ifndef M_PI
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#define M_PI 3.14159265358979323846264338327950
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#endif
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void draw_cube(void);
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/* callbacks */
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void disp(void);
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void reshape(int x, int y);
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void keyb(unsigned char key, int x, int y);
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void sbmot(int x, int y, int z); /* spaceball translation */
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void sbrot(int x, int y, int z); /* spaceball rotation */
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void sbbut(int bn, int state); /* spaceball button */
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vec3_t pos = {0, 0, -6};
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quat_t rot = {0, 0, 0, 1};
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int main(int argc, char **argv)
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{
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glutInit(&argc, argv);
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glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
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glutCreateWindow("spaceball demo");
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glutDisplayFunc(disp);
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glutReshapeFunc(reshape);
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glutKeyboardFunc(keyb);
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glutSpaceballMotionFunc(sbmot);
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glutSpaceballRotateFunc(sbrot);
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glutSpaceballButtonFunc(sbbut);
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glEnable(GL_CULL_FACE);
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glutMainLoop();
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return 0;
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}
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void disp(void)
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{
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mat4_t xform;
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quat_to_mat(xform, rot);
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glClear(GL_COLOR_BUFFER_BIT);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glTranslatef(pos.x, pos.y, pos.z);
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glMultMatrixf((float*)xform);
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draw_cube();
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glutSwapBuffers();
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}
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void draw_cube(void)
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{
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glBegin(GL_QUADS);
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/* face +Z */
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glNormal3f(0, 0, 1);
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glColor3f(1, 0, 0);
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glVertex3f(-1, -1, 1);
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glVertex3f(1, -1, 1);
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glVertex3f(1, 1, 1);
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glVertex3f(-1, 1, 1);
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/* face +X */
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glNormal3f(1, 0, 0);
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glColor3f(0, 1, 0);
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glVertex3f(1, -1, 1);
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glVertex3f(1, -1, -1);
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glVertex3f(1, 1, -1);
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glVertex3f(1, 1, 1);
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/* face -Z */
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glNormal3f(0, 0, -1);
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glColor3f(0, 0, 1);
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glVertex3f(1, -1, -1);
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glVertex3f(-1, -1, -1);
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glVertex3f(-1, 1, -1);
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glVertex3f(1, 1, -1);
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/* face -X */
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glNormal3f(-1, 0, 0);
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glColor3f(1, 1, 0);
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glVertex3f(-1, -1, -1);
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glVertex3f(-1, -1, 1);
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glVertex3f(-1, 1, 1);
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glVertex3f(-1, 1, -1);
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/* face +Y */
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glNormal3f(0, 1, 0);
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glColor3f(0, 1, 1);
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glVertex3f(-1, 1, 1);
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glVertex3f(1, 1, 1);
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glVertex3f(1, 1, -1);
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glVertex3f(-1, 1, -1);
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/* face -Y */
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glNormal3f(0, -1, 0);
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glColor3f(1, 0, 1);
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glVertex3f(-1, -1, -1);
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glVertex3f(1, -1, -1);
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glVertex3f(1, -1, 1);
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glVertex3f(-1, -1, 1);
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glEnd();
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}
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/* 45deg fov */
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#define FOV (M_PI / 4.0)
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void reshape(int x, int y)
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{
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float aspect = (float)x / (float)y;
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float halfy = (float)tan(FOV / 2.0);
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float halfx = halfy * aspect;
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glViewport(0, 0, x, y);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glFrustum(-halfx, halfx, -halfy, halfy, 1.0, 1000.0);
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}
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void keyb(unsigned char key, int x, int y)
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{
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switch(key) {
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case 'q':
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case 'Q':
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case 27:
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exit(0);
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case ' ':
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/* reset initial view */
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pos = v3_cons(0, 0, -6);
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rot = quat_cons(1, 0, 0, 0);
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glutPostRedisplay();
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default:
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break;
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}
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}
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void sbmot(int x, int y, int z)
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{
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pos.x += x * 0.001f;
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pos.y += y * 0.001f;
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pos.z -= z * 0.001f;
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glutPostRedisplay();
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}
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void sbrot(int x, int y, int z)
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{
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float axis_len = (float)sqrt(x * x + y * y + z * z);
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rot = quat_rotate(rot, axis_len * 0.001f, -x / axis_len, -y / axis_len, z / axis_len);
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glutPostRedisplay();
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}
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void sbbut(int bn, int state)
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{
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if(state == GLUT_DOWN) {
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pos = v3_cons(0, 0, -6);
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rot = quat_cons(1, 0, 0, 0);
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glutPostRedisplay();
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}
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}
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