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学习汇报openGL

本主题由 admin_cn 于 7-12-2007 17:39 移动

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1楼大中小发表于 4-12-2007 23:46 只看该作者

学习汇报openGL

#include <gl\glaux.h>5 v6 f! {! H! t# o; [* [
#include <stdio.h>
#include <stdlib.h>1 y  p4 j2 f9 F: i* \7 z
#include <string.h>
#include <math.h>
#include "GL/glut.h"

void Display();3 K$ x, L" c+ g5 I
void HandleVisibility(int visible);2 C4 A6 i. H$ r) A
void HandleIdle();" C, ^6 A* |/ I
void HandleReshape(int w,int h);9 ~8 Q- B$ E: x& r+ S- s  C* e3 X
void HandleKeyboard(unsigned char key,int x,int y);5 V" [, \- P) b( R: m" m: S$ ]
void CreateEnvironment();6 @+ Q( z) Z" x2 F" {8 B5 B
void MakeGeometry();5 K( [# ]/ I& \6 d: l. J" e0 M
void MakeLighting();
AUX_RGBImageRec *LoadBMP(char *Filename);
int LoadGLTextures();

GLuint texture;
+ H1 F% e# W  }7 z$ d7 o
GLfloat xrot;// X Rotation
GLfloat yrot;// Y Rotation
GLfloat zrot;// Z Rotation

GLfloat z=0.0f;
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int main(int argc,char **argv)
{
// Initialisation GLUT
int mode = GLUT_RGB|GLUT_DOUBLE;
glutInitDisplayMode(mode);

// Initialisation fenêtre
glutInitWindowSize(300,300);
glutInitWindowPosition(50,50);
glutCreateWindow("salut");0 o: b! y* U; D

// Initialisation Handlers. i& d! s) _3 n2 V
glutDisplayFunc(Display);
glutReshapeFunc(HandleReshape);0 N) z2 S5 d' g' x6 Y) v5 D
glutKeyboardFunc(HandleKeyboard);
glutIdleFunc(HandleIdle);) x7 J' K  r+ q9 A7 H& H% t, K
  o" V) i4 N9 f" Y3 K
// Initialisation contexte openGL
CreateEnvironment();* B* G  A. a# [$ F! K, q: t. b  ], Y

// Boucle principale1 a/ t1 Z/ L8 A/ N
glutMainLoop();
% F9 L/ ]& g. J6 x4 t- V
return(0);
}

void CreateEnvironment()
{ " b5 \" R7 ~% m" U8 n
glClearColor(0.0,0.0,0.0,1.0);
glClearDepth(1.0);
glEnable(GL_LIGHT0);" ~. [6 T0 y/ N# c3 C
      glEnable(GL_LIGHTING);
glEnable(GL_DEPTH_TEST);: y; ]2 O. v0 ~* H
glShadeModel(GL_SMOOTH);
      glEnable(GL_NORMALIZE);- h$ k  I5 f4 @7 ?$ ]3 ^% h
glColorMaterial(GL_FRONT_AND_BACK,GL_AMBIENT_AND_DIFFUSE);
      glEnable(GL_COLOR_MATERIAL);
glEnable(GL_TEXTURE_2D);# l& y4 t5 |& I2 y1 `/ I3 ]3 ?8 i
glDepthFunc(GL_LEQUAL);
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);

glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);
' Q! p7 K+ j) }* n4 q  q3 f
LoadGLTextures();! v  y) C2 C8 S6 I! j; _- K* L  I
}
! E0 [  u- W2 m" B0 F
void HandleReshape(int w,int h)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glViewport(0,0,(GLsizei)w,(GLsizei)h);3 v1 M$ E/ d, @9 o' A: R4 K
}# z, ?& }  `% D) v* j, m2 A$ j
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void HandleVisibility(int visible): ~: V& K' J. x5 C" ]; x1 V
{
if (visible==GLUT_VISIBLE) glutIdleFunc(HandleIdle);/ Z, ]0 ]8 p* P2 H7 z0 H' \
else glutIdleFunc(NULL);- l+ w5 x- @4 r
}. K. F, n! O6 `: e" \* l# F3 _

void HandleIdle()
{0 _* z% W+ [* |) `6 s
glutPostRedisplay();
}

void HandleKeyboard(unsigned char key,int x, int y)/ t) g. h* \4 h- ]/ X! P, Q
{
switch(key){
case 'q':case 'Q':
exit(EXIT_SUCCESS);
break;
' L, Q6 ~9 L$ o4 Z+ [9 ]+ Q5 r
case 'e':case 'E':
xrot-=0.2f;
break;
/ ?: x- r6 r# S8 k
case 'r':case 'R':" n$ O8 z, c$ |6 |% R( M
xrot+=0.2f;. f7 R8 `9 x" N5 g) s& K3 W$ g$ }2 \
break;/ H. ~: V/ n' J8 \

case 'c':case 'C':
yrot-=0.2f;
break; - y0 l) V5 e% B# O4 j8 j+ b

case 'v':case 'V':& f, j2 P9 z& K! U$ `
yrot+=0.2f;- y# j! \- K: u6 d
break; # S/ D; Q: y( N" t% [% \1 d3 U

case 't':case 'T':: N. Z% R3 T9 ?4 N
zrot-=0.2f;& D* [1 V5 \4 g! p# o/ Q2 p: f
break; 0 J) o  o, }0 p# D4 O# ~
$ K& n, b: e6 F( v, a
case 'y':case 'Y':
zrot+=0.2f;
break;
8 J  J) |6 x! I+ c/ P* D
case 'f':case 'F':" R7 Y2 _" b& i( I- u& K4 @% i( \
z-=0.02f;
break;: T8 M: P( @: W: f; u! a+ Q; i6 f
! B" T4 a3 N5 F: j
case 'a':case 'A':+ L% _- h- U( Z1 f5 e, g' a$ P6 h
z+=0.02f;
break;
( d5 F8 R$ S( {3 o. ^! u7 D
break;" o3 p0 D7 T$ Z
}
# f# U+ I6 }# S, Q
}6 w. Y( E; J  n+ Z3 `

void Display()
{) n: G7 @, @' O$ B) n
/ o2 h" M2 F% ~: S
// Initialisation de la matrice de projection

glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective (75, 1, 1, 300);

// Initialisation de la caméra
glMatrixMode(GL_MODELVIEW);& t8 Y" H+ l5 q/ H
glLoadIdentity();
gluLookAt(3, 3, 3, 0, 0, 0, 0, 1, 0);' ]; P4 V# H6 V( Z( @4 O) w% S
: O/ s* H* X: F' t/ D
, ?% X/ ?* h7 ]) {
//Rotate and Translate% a9 A' f' d3 }1 k9 S6 ~" s
glTranslatef(0.0f,0.0f,z);1 s# x# f7 S3 `4 Z: f! N) A2 G: w) H

glRotatef(xrot,1.0f,0.0f,0.0f);- r2 K. P" V& @8 ~/ u; O" P
glRotatef(yrot,0.0f,1.0f,0.0f);, T$ B! o7 K) _6 \, b$ a
glRotatef(zrot,0.0f,0.0f,1.0f);" g0 c- V. w) l% \: X

// Génération de la scène (lumière + géométrie)5 o; d6 ?! E' @3 x7 `8 l# ?5 ]$ x
MakeLighting();
MakeGeometry();

// Swap des buffers
glutSwapBuffers();8 r+ @% A- _( L
5 `4 y9 m8 S( p
}

void MakeGeometry()/ m+ U2 ?' N9 p$ D' F
{
      glBindTexture(GL_TEXTURE_2D, texture);) t4 O& B7 L5 h5 H3 r
glBegin(GL_QUADS);+ n; F3 l: |! j0 L" i
// Surface en face
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);& N# I( F% u0 x8 C# q  N
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);9 e* v* A: e3 }; O
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f);; w! r! M$ B- v$ L3 g
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f);
// Surface en derière
glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);6 S1 F3 F. ^; z& ]7 e$ g5 S
glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
// Surface en tête
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);1 \+ l, @' M1 I
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f,  1.0f,  1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f,  1.0f,  1.0f);; o! j, A( N0 R" m0 t# h
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);
// Surface en bas
glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -1.0f, -1.0f);2 }2 s+ p' ^* n; ~( v  ]; I8 K0 c
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, -1.0f, -1.0f);# J. _3 W% [! y. Q
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);
// Surface à droite
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);' H/ L# c6 Q& |& G6 _3 @& U! }2 M! O5 w
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);
// Surface à gauche5 ?& E% x) ~+ v- g4 p5 ~
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f);& X) V' _4 E5 _8 H& U
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);
glEnd();# F% G! Y) O& B' K$ T( F" L
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}

void MakeLighting()
{
// Désactiver toutes les lumières% v  J6 [! E. V' M; {
glDisable(GL_LIGHTING);  R9 A# @9 Q: F& B3 U# L5 G( _
glDisable(GL_LIGHT0);: X) d4 k8 t, c6 b9 \) ]

// Initialisation des paramètres
GLfloat LightAmbient[]={ 0.5f, 0.5f, 0.5f, 1.0f };
GLfloat LightDiffuse[]={ 1.0f, 1.0f, 1.0f, 1.0f };  H5 Y, G) N: S% y% p  P1 W( b4 c
GLfloat LightPosition[]={ 0.0f, 0.0f, 2.0f, 1.0f };$ V- v9 }0 w& {4 k* L
$ \1 F* N1 u* U: e* `" m. \# H
// Initialisation de la position, ambient, diffuse et specular et activation d'une lumière$ P; w8 I! p' M  c" Z
glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER,GL_TRUE);# i" T' `- L+ u' i* p7 v# [$ W8 _/ E
glLightModeli(GL_LIGHT_MODEL_TWO_SIDE,GL_FALSE);$ O. E6 W7 y, k# H
glLightfv( GL_LIGHT0, GL_AMBIENT, LightAmbient);5 B( R* c+ F9 i, K/ u& W0 e) A
glLightfv(GL_LIGHT0, GL_DIFFUSE, LightDiffuse);
glLightfv( GL_LIGHT0, GL_POSITION, LightPosition);
& n' Z6 }% g% F+ O' w
//spot
GLfloat spot[]={60.0};% O/ N1 Q4 F! Z! a/ |
glLightfv(GL_LIGHT0,GL_SPOT_CUTOFF, spot);
GLfloat spot_direction[] = {0.0f,-5.0f,0.0f};
glLightfv(GL_LIGHT0,GL_SPOT_DIRECTION, spot_direction);. W3 P: L2 Y# ]! L$ r
# d" ]' p6 R& t6 s6 q
// Modèle d'éclairage Gouraud
glShadeModel(GL_SMOOTH);
6 j3 H. r$ g' F! Z! }+ V' x
// Activer la lumière$ s2 w- {$ A; z/ [/ p6 d
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);% _0 u& ^4 q2 ]. p
" i2 z5 {& j3 k  s
}

AUX_RGBImageRec *LoadBMP(char *Filename)
{6 d- G6 k7 e! q
FILE *fp;: _0 D5 N- x  g, L0 O, ?7 x

if (fp=fopen(Filename,"r"))' R  j( g6 k9 J& H9 ]/ W( L
{  S- I, ~0 w+ u6 c$ b
fclose(fp);
return auxDIBImageLoad(Filename);
}& x7 t  O9 [. l
8 j$ I5 k) F$ _9 c, r
return NULL;
}

int LoadGLTextures(). u9 V+ w' O. W( {/ J0 l2 A& L' h: Z
{! ]  B& [- B# y& [: T" j
// Create Storage Space For The Texture
AUX_RGBImageRec *TextureImage;

// Load The Bitmap, Check For Errors, If Bitmap's Not Found Quit
if (TextureImage=LoadBMP("Crate.bmp"))
{
. p3 A& E$ F2 Q! w# i
// Générer l'espace nécessaire au stockage d'une texture
    glGenTextures(1,&texture);
// Sélection de la texture + initialisation des paramètres de rendu# n9 g1 h0 T" e9 p& M: C& T! L3 J1 T
glBindTexture(GL_TEXTURE_2D,texture);+ X7 i/ y4 S  V/ Z
( q3 b& g$ v: @& [9 J
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);1 @' `% X4 f) t& ]$ f! L
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S, GL_REPEAT);& N- ~( B$ ]5 V6 r
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexEnvi(GL_TEXTURE_2D,GL_TEXTURE_ENV_MODE,GL_MODULATE);

// Génération de la texture
glTexImage2D(GL_TEXTURE_2D,0,GL_RGB,TextureImage->sizeX,TextureImage->sizeY,0,GL_RGB,GL_UNSIGNED_BYTE,TextureImage->data);9 i1 f% [1 z7 U5 ~

// Libération de la mémoire
free(TextureImage->data);4 i+ H. f1 W8 y  r6 A
return(true);
}
return(false);$ q# M' J+ E9 K7 ~
}

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