static void draw()
{
static int last_time = 0;
const int current_time = glutGet(GLUT_ELAPSED_TIME);
const float delta = float(current_time - last_time) / 1000.0f;
camera.translation += get_walk_direction() * Vec3f(delta) * Vec3f(0.05);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glLoadMatrixf(to_mat4(inverse(camera)).data);
// LIGHT SETUP HERE
const Vec3f tmp = normalize(Vec3f(1, 1, 0));
const Vec4f light_dir(tmp.x, tmp.y, tmp.z, 0);
const Vec4f ambient(0.4, 0.4, 0.4, 1);
const Vec4f diffuse(1, 1, 1, 1);
glLightfv(GL_LIGHT0, GL_AMBIENT, ambient.data);
glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse.data);
glLightfv(GL_LIGHT0, GL_POSITION, light_dir.data);
// RENDER HERE
glBegin(GL_TRIANGLES);
for (int idx : indices) {
const Vertex &v = vertices[idx];
glNormal3fv(v.normal.data);
glVertex3fv(v.position.data);
}
glEnd();
glutSwapBuffers();
glutPostRedisplay();
}
void get_camera_vectors(Vec3 *look_dir, Vec3 *up, Vec3 *right, const Quat &orient)
{
NG_ASSERT(look_dir != nullptr);
NG_ASSERT(up != nullptr);
NG_ASSERT(right != nullptr);
const Mat4 m = to_mat4(inverse(orient));
*right = { m[0], m[4], m[8]};
*up = { m[1], m[5], m[9]};
*look_dir = {-m[2], -m[6], -m[10]};
}
Mat4 to_mat4(const Transform &tf)
{
return to_mat4(tf.orientation) * Mat4_Translate(tf.translation);
}