PICKDPTH.C
Три накладывающихся прямоугольника .
#include <windows.h>
//PICKDPTH.C
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glaux.h>
#include <stdio.h>
void myinit(void);
void drawRects(GLenum mode);
void processHits (GLint hits, GLuint buffer[]);
void CALLBACK pickRects(AUX_EVENTREC *event);
void CALLBACK display(void);
void CALLBACK myReshape(GLsizei w, GLsizei h);
void myinit(void)
{
glClearColor (0.0, 0.0, 0.0, 0.0);
glDepthFunc(GL_LESS);
glEnable(GL_DEPTH_TEST);
glShadeModel(GL_FLAT);
glDepthRange (0.0, 1.0);
}
void drawRects(GLenum mode)
{
if (mode == GL_SELECT)
glLoadName (1);
glBegin (GL_QUADS);
glColor3f (1.0, 1.0, 0.0);
glVertex3i (2, 0, 0);
glVertex3i (2, 6, 0);
glVertex3i (6, 6, 0);
glVertex3i (6, 0, 0);
glColor3f (0.0, 1.0, 1.0);
glVertex3i (3, 2, -1);
glVertex3i (3, 8, -1);
glVertex3i (8, 8, -1);
glVertex3i (8, 2, -1);
glColor3f (1.0, 0.0, 1.0);
glVertex3i (0, 2, -2);
glVertex3i (0, 7, -2);
glVertex3i (5, 7, -2);
glVertex3i (5, 2, -2);
glEnd ();
}
void processHits (GLint hits, GLuint buffer[])
{
int i;
GLint names, *ptr;
ptr = (int *)(GLuint *) buffer;
for (i = 0; i < hits; i++) {
names = *ptr;
}
}
#define BUFSIZE 512
void CALLBACK pickRects(AUX_EVENTREC *event)
{
GLuint selectBuf[BUFSIZE];
GLint hits;
GLint viewport[4];
int x, y;
x = event->data[AUX_MOUSEX];
y = event->data[AUX_MOUSEY];
glGetIntegerv (GL_VIEWPORT, viewport);
glSelectBuffer (BUFSIZE, selectBuf);
(void) glRenderMode (GL_SELECT);
glInitNames();
glPushName((unsigned)-1);
glMatrixMode (GL_PROJECTION);
glPushMatrix ();
glLoadIdentity ();
gluPickMatrix ((GLdouble) x, (GLdouble) (viewport[3] - y),
5.0, 5.0, viewport);
glOrtho (0.0, 8.0, 0.0, 8.0, -0.5, 2.5);
drawRects (GL_SELECT);
glPopMatrix ();
glFlush ();
hits = glRenderMode (GL_RENDER);
}
void CALLBACK display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
drawRects (GL_RENDER);
glFlush();
}
void CALLBACK myReshape(GLsizei w, GLsizei h)
{
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho (0.0, 8.0, 0.0, 8.0, 0.0, 2.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
int main(int argc, char** argv)
{
auxInitDisplayMode (AUX_SINGLE | AUX_RGB | AUX_DEPTH16);
auxInitPosition (0, 0, 100, 100);
auxInitWindow ("Picking Rectangles");
myinit ();
auxMouseFunc (AUX_LEFTBUTTON, AUX_MOUSEDOWN, pickRects);
auxReshapeFunc (myReshape);
auxMainLoop(display);
return(0);
}
Posted: 25.01.2k1
Autor: Unknown
<nomail@noserver.com>
|
 |
|
|
