Gestion de la caméra et d´une lampe en OpenGL
Ce programme affiche deux scènes simultanées:- un objet en vue perspective configurable;
- une vue en perspective de la pyramide de vision de la première scène.
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Fichier : demoGLUT/demo5.cpp
#include "demo.h"
/*********************************************************************
* AUTOGENERATED CODE
*********************************************************************/
#include "clear.hpp"
#include "camera.hpp"
#include "lightmodel.hpp"
#include "lightposition.hpp"
#include "lightcolor.hpp"
#include "spotlight.hpp"
#include "material.hpp"
#include "object.hpp"
#include "flush.hpp"
/*********************************************************************
* FUNCTIONS
*********************************************************************/
void lightingDisplay(float,float);
void mainDisplay(float,float);
void externalDisplay(float,float);
/*********************************************************************
* GUI DESIGN
*********************************************************************/
SCENE(SceneMain,mainDisplay,NULL);
SCENE(SceneExternal,externalDisplay,NULL);
SPLIT(SplitScene,0,0.5,&SceneMain,&SceneExternal);
CONTROL(ControlLightmodel,lightmodelLines);
CONTROL(ControlLightposition,lightpositionLines);
CONTROL(ControlLightcolor,lightcolorLines);
CONTROL(ControlSpotlight,spotlightLines);
static tab TabsLighting_Items[4]={
{"Light model",&ControlLightmodel},
{"Light position",&ControlLightposition},
{"Light color",&ControlLightcolor},
{"Spotlight",&ControlSpotlight}
};
TABS(TabsLighting,TabsLighting_Items);
CONTROL(ControlClear,clearLines);
CONTROL(ControlCamera,cameraLines);
CONTROL(ControlMaterial,materialLines);
CONTROL(ControlObject,objectLines);
CONTROL(ControlFlush,flushLines);
static tab TabsControl_Items[6]={
{"Clear",&ControlClear},
{"Camera",&ControlCamera},
{"Lighting",&TabsLighting},
{"Material",&ControlMaterial},
{"Object",&ControlObject},
{"Flush",&ControlFlush}
};
TABS(TabsControl,TabsControl_Items);
SPLIT(SplitRoot,1,0.55,&TabsControl,&SplitScene);
/*********************************************************************
* CALLBACKS
*********************************************************************/
void lightingDisplay(float MouseX,float MouseY){
lightmodelDisplay(MouseX,MouseY);
lightpositionDisplay(MouseX,MouseY);
lightcolorDisplay(MouseX,MouseY);
spotlightDisplay(MouseX,MouseY);
}
void mainDisplay(float MouseX,float MouseY){
clearDisplay(MouseX,MouseY);
cameraDisplay(MouseX,MouseY);
materialDisplay(MouseX,MouseY);
lightingDisplay(MouseX,MouseY);
objectDisplay(MouseX,MouseY);
flushDisplay(MouseX,MouseY);
}
void externalDisplay(float MouseX,float MouseY){
float o=_camera_Floats[0],p=_camera_Floats[1];
float r=_camera_Floats[3],u=r*p*tan(o*PI/360),v=r*tan(o*PI/360),w=-_camera_Floats[4]+r;
float rr=_camera_Floats[2],uu=rr*p*tan(o*PI/360),vv=rr*tan(o*PI/360),ww=-_camera_Floats[4]+rr;
glClearColor(0.2,0.2,0.2,0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(80,1,0.1,50);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(10,0,0,0,0,0,0,1,0);
glRotatef(MouseX,0,1,0);
glRotatef(MouseY,1,0,0);
glDisable(GL_LIGHTING);
glColor3f(0.5,0.8,0.5);
glBegin(GL_QUADS);
glVertex3f(-u,-v,w);
glVertex3f(-u,v,w);
glVertex3f(u,v,w);
glVertex3f(u,-v,w);
glVertex3f(-uu,-vv,ww);
glVertex3f(-uu,vv,ww);
glVertex3f(uu,vv,ww);
glVertex3f(uu,-vv,ww);
glEnd();
glColor3f(0.5,0.5,1);
glBegin(GL_LINES);
glVertex3f(u,v,w);
glVertex3f(0,0,-_camera_Floats[4]);
glVertex3f(-u,-v,w);
glVertex3f(0,0,-_camera_Floats[4]);
glVertex3f(u,-v,w);
glVertex3f(0,0,-_camera_Floats[4]);
glVertex3f(-u,v,w);
glVertex3f(0,0,-_camera_Floats[4]);
glEnd();
lightingDisplay(MouseX,MouseY);
materialDisplay(MouseX,MouseY);
objectDisplay(SceneMain.Data.Scene->LastX-SceneMain.Data.Scene->X,SceneMain.Data.Scene->Y-SceneMain.Data.Scene->LastY);
glFlush();
glutSwapBuffers();
}
/*********************************************************************
* MAIN PROGRAM
*********************************************************************/
int main(int argc,char *argv[]){
int a=800,b=600,x,y;
glutInit(&argc,argv);
x=glutGet(GLUT_SCREEN_WIDTH);
y=glutGet(GLUT_SCREEN_HEIGHT);
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH);
glutInitWindowPosition((x-a)/2,(y-b)/2);
glutInitWindowSize(a,b);
createWindow(&SplitRoot,"OpenGL demo");
glutMainLoop();
return 0;
}
Pour information:
Le code original qui a été traduit par le programme convert:
-
vider les différents tampons:
Fichier : demoGLUT/clear.txtglClearColor(#f0:0.2:1#,#f0:0.2:1#,#f0:0.2:1#,0); glClear(#eGL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT:GL_COLOR_BUFFER_BIT:GL_DEPTH_BUFFER_BIT#); if (#e1:0#) glEnable(GL_DEPTH_TEST); else glDisable(GL_DEPTH_TEST);
- définir la caméra
Fichier : demoGLUT/camera.txtglMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(#f1:70:179#,#f0.1:1:5#,#f1:1:3#,#f3:5:5#); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt(0,0,-#f1:3:20#,0,0,0,0,1,0);
- définir le modèle d’éclairement
Fichier : demoGLUT/lightmodel.txtint enable_lighting=#e1:0#; GLfloat light_model_ambient[]={#f0:0.2:1#,#f0:0.2:1#,#f0:0.2:1#}; glEnable(GL_LIGHT0); if (enable_lighting) glEnable(GL_LIGHTING); else glDisable(GL_LIGHTING); glLightModelfv(GL_LIGHT_MODEL_AMBIENT,light_model_ambient); glLightModelf(GL_LIGHT_MODEL_LOCAL_VIEWER,#e0:1#); glLightModelf(GL_LIGHT_MODEL_TWO_SIDE,#e0:1#);
- définir la position de la lampe
Fichier : demoGLUT/lightposition.txtGLfloat light_pos[]={#f-10:-2:10#,#f-10:2:10#,#f-10:-10:10#,#e1:0#}; glLightfv(GL_LIGHT0,GL_POSITION,light_pos);
- définir les couleurs de la lampe
Fichier : demoGLUT/lightcolor.txtGLfloat light_ambient[]={#f0:0:1#,#f0:0:1#,#f0:0:1#,1}; GLfloat light_diffuse[]={#f0:1:1#,#f0:1:1#,#f0:1:1#,1}; GLfloat light_specular[]={#f0:1:1#,#f0:1:1#,#f0:1:1#,1}; glLightfv(GL_LIGHT0,GL_AMBIENT,light_ambient); glLightfv(GL_LIGHT0,GL_DIFFUSE,light_diffuse); glLightfv(GL_LIGHT0,GL_SPECULAR,light_specular);
- définir le spot de la lampe
Fichier : demoGLUT/spotlight.txtGLfloat spot_direction[]={#f-10:2:10#,#f-10:-2:10#,#f-10:10:10#}; glLightfv(GL_LIGHT0,GL_SPOT_DIRECTION,spot_direction); glLighti(GL_LIGHT0,GL_SPOT_CUTOFF,#e180:0:1:2:3:4:5:7:10:15:20:25:30:40:50:60:70:80:90#); glLighti(GL_LIGHT0,GL_SPOT_EXPONENT,#i0:0:128#); glLightf(GL_LIGHT0,GL_CONSTANT_ATTENUATION,#f0:1:5#); glLightf(GL_LIGHT0,GL_LINEAR_ATTENUATION,#f0:0:5#); glLightf(GL_LIGHT0,GL_QUADRATIC_ATTENUATION,#f0:0:5#);
- définir la matière de l’objet
Fichier : demoGLUT/material.txtint enable_color_material=#e0:1#; if (enable_color_material) glEnable(GL_COLOR_MATERIAL); else glDisable(GL_COLOR_MATERIAL); glColorMaterial(GL_FRONT_AND_BACK,#eGL_AMBIENT_AND_DIFFUSE:GL_EMISSION:GL_AMBIENT:GL_DIFFUSE:GL_SPECULAR#); GLfloat material_ambient[]={#f0:0.1:1#,#f0:0.12:1#,#f0:0.15:1#,1}; GLfloat material_diffuse[]={#f0:0.5:1#,#f0:0.56:1#,#f0:0.45:1#,1}; GLfloat material_specular[]={#f0:0.4:1#,#f0:0.3:1#,#f0:0.2:1#,1}; GLfloat material_emission[]={#f0:0:1#,#f0:0:1#,#f0:0:1#,1}; GLfloat material_shininess=#f0:10:100#; glMaterialfv(GL_FRONT_AND_BACK,GL_AMBIENT,material_ambient); glMaterialfv(GL_FRONT_AND_BACK,GL_DIFFUSE,material_diffuse); glMaterialfv(GL_FRONT_AND_BACK,GL_SPECULAR,material_specular); glMaterialfv(GL_FRONT_AND_BACK,GL_EMISSION,material_emission); glMaterialfv(GL_FRONT_AND_BACK,GL_SHININESS,&material_shininess); glColor3f(#f0:1:1#,#f0:0:1#,#f0:0:1#);
- définir la géométrie de l’objet
Fichier : demoGLUT/object.txtglRotatef(MouseX,0,1,0); glRotatef(MouseY,1,0,0); glShadeModel(#eGL_FLAT:GL_SMOOTH#); switch(#e8:0:1:2:3:4:5:6:7#){ case 0: glutSolidCube(#f0.1:1:5#);break; case 1: glutSolidSphere(#f0.1:1:5#,#i1:30:200#,#i1:30:200#);break; case 2: glutSolidCone(#f0.1:1:5#,#f0.1:1:5#,#i1:30:200#,#i1:30:200#);break; case 3: glutSolidTorus(#f0.01:0.1:1#,#f0.1:1:5#,#i1:30:200#,#i1:30:200#);break; case 4: glutSolidDodecahedron();break; case 5: glutSolidOctahedron();break; case 6: glutSolidTetrahedron();break; case 7: glutSolidIcosahedron();break; case 8: glutSolidTeapot(#f0.1:1:5#); }
- vider la pile d’instruction
Fichier : demoGLUT/flush.txtif (#e1:0#) glFlush(); if (#e1:0#) glutSwapBuffers();
Ce document a été traduit de LaTeX par HeVeA