/**
* @brief Renders everything; called once on startup
* and then to animate hull algorithm steps.
*/
void ConvexHullApp::OnRender()
{
SDL_FillRect(surf, NULL, SDL_MapRGB(surf->format, 255, 255, 255));
draw_points();
draw_hull();
SDL_Flip(surf);
}
void window_refresh_callback(GLFWwindow* window) {
view_params* view = (view_params*)glfwGetWindowUserPointer(window);
char title[4096];
sprintf(title, "ysym | %s | %.3g | %d", view->filename.c_str(), view->time,
view->frame);
glfwSetWindowTitle(window, title);
// begin frame
ym_vec4f background = view->backgrounds[view->background];
glClearColor(background[0], background[1], background[2], background[3]);
glEnable(GL_DEPTH_TEST);
glClearDepth(1);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// draw
shade(view->scene, view->cur_camera, view->shade_prog,
view->shade_txt.data(), view->exposure, view->gamma, view->view_edges,
view->camera_lights);
// draw hull
if (view->view_hull)
draw_hull(view->rigid_scene, view->scene, 1, view->cur_camera,
view->shade_prog);
// end frame
glfwSwapBuffers(window);
}
/* Draw the nurb, possibly with trimming */
void draw_nurb(GLboolean trimming) {
static GLfloat angle = 0.0;
int i,j;
/* wave the flag by rotating Z coords though a sine wave */
for (i=1; i<4; i++)
for (j=0; j<4; j++)
ctlpoints[i][j][2] = sin((GLfloat)i+angle);
angle += 0.1;
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glTranslatef(2.5,-1.0,0.0);
glScalef(1.5,1.0,1.0);
glRotatef(90,0.,0.,1.);
glRotatef(mousey/10.,1.,0.,0.);
glRotatef(mousex/10.,0.,1.,0.);
gluBeginSurface(nurbsflag);
gluNurbsSurface(nurbsflag,S_NUMKNOTS, sknots, T_NUMKNOTS, tknots,
3 * T_NUMPOINTS, 3,
&ctlpoints[0][0][0], T_ORDER, S_ORDER, GL_MAP2_VERTEX_3);
if (trimming) {
dotrim(whole);
dotrim(path[0]);
dotrim(path[1]);
dotrim(path[2]);
}
gluEndSurface(nurbsflag);
if (hull) draw_hull(ctlpoints);
glPopMatrix();
}
