diff options
Diffstat (limited to 'samples/OpenGL/frustum/frustum.c')
| -rw-r--r-- | samples/OpenGL/frustum/frustum.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/samples/OpenGL/frustum/frustum.c b/samples/OpenGL/frustum/frustum.c index c5732c8..2728cee 100644 --- a/samples/OpenGL/frustum/frustum.c +++ b/samples/OpenGL/frustum/frustum.c @@ -412,6 +412,23 @@ struct { float near, far; } frustum = {-1, 1, -1, 1, 1, 4}; +struct { + struct { + float phi, theta; + } rot; +} observer; + +void observer_motion(int x, int y) +{ + int const win_width = glutGet(GLUT_WINDOW_WIDTH); + int const win_height = glutGet(GLUT_WINDOW_HEIGHT); + + observer.rot.phi = -180.f + 360.f * (float)x / (float)win_width; + observer.rot.theta = -90.f + 180.f * (float)y / (float)win_height; + + glutPostRedisplay(); +} + void display_observer(float frustum_aspect) { int const win_width = glutGet(GLUT_WINDOW_WIDTH); @@ -434,8 +451,8 @@ void display_observer(float frustum_aspect) glLoadIdentity(); if(1) { glTranslatef(0, 0, -10); - glRotatef(15, 1, 0, 0); - glRotatef(-15, 0, 1, 0); + glRotatef(observer.rot.theta, 1, 0, 0); + glRotatef(observer.rot.phi, 0, 1, 0); glTranslatef(0, 0, 2.5); } else { gluLookAt(3, 1, -5, 0, 0, -2.5, 0, 1, 0); @@ -536,6 +553,8 @@ int main(int argc, char *argv[]) window_observer = glutCreateWindow("Observer"); glutDisplayFunc(display); + glutMotionFunc(observer_motion); + glutPassiveMotionFunc(observer_motion); window_view = glutCreateWindow("Frustum View"); glutDisplayFunc(display); |