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#ifdef USE_OPENGL
#ifdef WIN32
#include <windows.h>
#endif
#include <GL/gl.h>
#include <GL/glu.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include "iup.h"
#include "iupgl.h"
typedef struct _color3D
{
double r;
double g;
double b;
} color3D;
static void add_color_vertex(const color3D* c)
{
glColor3d(c->r, c->g, c->b);
glVertex3d(c->r, c->g, c->b);
}
static void draw_cube_face(const color3D* c1, const color3D* c2, const color3D* c3, const color3D* c4)
{
color3D cm;
cm.r = (c1->r + c2->r + c3->r + c4->r)/4;
cm.g = (c1->g + c2->g + c3->g + c4->g)/4;
cm.b = (c1->b + c2->b + c3->b + c4->b)/4;
add_color_vertex(&cm);
add_color_vertex(c1);
add_color_vertex(c2);
add_color_vertex(&cm);
add_color_vertex(c2);
add_color_vertex(c3);
add_color_vertex(&cm);
add_color_vertex(c3);
add_color_vertex(c4);
add_color_vertex(&cm);
add_color_vertex(c4);
add_color_vertex(c1);
}
const color3D c3D_black = {0.0, 0.0, 0.0};
const color3D c3D_red = {1.0, 0.0, 0.0};
const color3D c3D_green = {0.0, 1.0, 0.0};
const color3D c3D_blue = {0.0, 0.0, 1.0};
const color3D c3D_cian = {0.0, 1.0, 1.0};
const color3D c3D_magenta = {1.0, 0.0, 1.0};
const color3D c3D_yellow = {1.0, 1.0, 0.0};
const color3D c3D_white = {1.0, 1.0, 1.0};
static void draw_cube(void)
{
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glBegin(GL_TRIANGLES);
draw_cube_face(&c3D_black, &c3D_blue, &c3D_magenta, &c3D_red);
draw_cube_face(&c3D_black, &c3D_green, &c3D_cian, &c3D_blue);
draw_cube_face(&c3D_black, &c3D_red, &c3D_yellow, &c3D_green);
draw_cube_face(&c3D_white, &c3D_cian, &c3D_blue, &c3D_magenta);
draw_cube_face(&c3D_white, &c3D_cian, &c3D_green, &c3D_yellow);
draw_cube_face(&c3D_white, &c3D_magenta, &c3D_red, &c3D_yellow);
glEnd();
}
static void init(void)
{
glClearColor(0.5,0.5,0.5,0.0);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45, 1, 1, 10);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt (0.5, 0.5, 3.0, /* posicao do observador */
0.5, 0.5, 0.0, /* ponto de referencia */
0.0, 1.0, 0.0); /* vup */
glEnable(GL_DEPTH_TEST);
glClearDepth (1.0);
}
static void unproject (double x2, double y2, double *x3, double *y3, double *z3)
{
double mv[16];
double pm[16];
int vp[4];
glGetDoublev (GL_MODELVIEW_MATRIX, mv);
glGetDoublev (GL_PROJECTION_MATRIX, pm);
glGetIntegerv (GL_VIEWPORT, vp);
gluUnProject (x2, y2, 0.0,
mv, pm, vp,
x3, y3, z3);
}
static int pos_x, pos_y;
static int move = 0;
static int button_cb(Ihandle *ih,int but,int pressed,int x,int y,char* status)
{
(void)ih;
(void)status;
if (but==IUP_BUTTON1)
{
if (pressed)
{
pos_x = x;
pos_y = y;
move = 1;
}
else
{
move = 0;
}
}
return IUP_DEFAULT;
}
#define INVERT_Y(_y) (height-y)
static int motion_cb(Ihandle *ih,int x,int y,char* status)
{
(void)status;
if (move)
{
double dif_x, dif_y;
double dx, dy, dz;
double x1, y1, z1;
double x2, y2, z2;
double angle, norma;
int height = IupGetInt2(ih, "RASTERSIZE");
IupGLMakeCurrent(ih);
dif_x = x - pos_x;
dif_y = y - pos_y;
pos_x = x;
pos_y = y;
angle = sqrt(dif_x*dif_x + dif_y*dif_y);
unproject (pos_x, INVERT_Y(pos_y), &x1, &y1, &z1);
unproject ((double)(dif_y+pos_x), (double)(dif_x+INVERT_Y(pos_y)), &x2, &y2, &z2);
dx = x2-x1; dy = y2-y1; dz = z2-z1;
norma = sqrt(dx*dx + dy*dy + dz*dz);
dx /= norma; dy /= norma; dz /= norma;
glTranslated(0.5, 0.5, 0.5);
glRotated (angle, dx, dy, dz);
glTranslated(-0.5, -0.5, -0.5);
draw_cube();
IupGLSwapBuffers(ih);
}
return IUP_DEFAULT;
}
static int action(Ihandle *ih)
{
IupGLMakeCurrent(ih);
glClear (GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
draw_cube();
IupGLSwapBuffers(ih);
return IUP_DEFAULT;
}
void GLCanvasCubeTest(void)
{
Ihandle *dlg, *canvas, *box;
IupGLCanvasOpen();
box = IupVbox(NULL);
IupSetAttribute(box, "MARGIN", "5x5");
canvas = IupGLCanvas(NULL);
IupSetCallback(canvas, "ACTION", action);
IupSetCallback(canvas, "BUTTON_CB", (Icallback)button_cb);
IupSetCallback(canvas, "MOTION_CB", (Icallback)motion_cb);
IupSetAttribute(canvas, "BUFFER", "DOUBLE");
IupSetAttribute(canvas, "RASTERSIZE", "300x300");
IupAppend(box, canvas);
dlg = IupDialog(IupSetAttributes(IupFrame(box), "TITLE=Teste"));
IupSetAttribute(dlg, "TITLE", "IupGLCanvas Test");
// IupSetAttribute(dlg, "COMPOSITED", "YES");
IupMap(dlg);
IupGLMakeCurrent(canvas);
init();
printf("Vendor: %s\n", glGetString(GL_VENDOR));
printf("Renderer: %s\n", glGetString(GL_RENDERER));
printf("Version: %s\n", glGetString(GL_VERSION));
IupSetAttribute(canvas, "RASTERSIZE", NULL);
IupShowXY(dlg, IUP_CENTER, IUP_CENTER);
}
#ifndef BIG_TEST
int main(int argc, char* argv[])
{
IupOpen(&argc, &argv);
GLCanvasCubeTest();
IupMainLoop();
IupClose();
return EXIT_SUCCESS;
}
#endif
#endif
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