/* Exemple de génération procédurale et d'utilisation d'une texture. */ #include <math.h> #include "glut_import.h" #include "application.h" #include "texture.h" #define N 30 #define M 15 #define pi 3.141592653589793 class DemoWindow:public Window{ Texture_2D tex; void vertex(float i,float j){ float o1=pi*i*2/N,o2=pi*(j/M-0.5); glTexCoord2f(i/N,j/M); glColor3f(0.5+0.5*cos(o2)*cos(o1),0.5+0.5*sin(o2),0.5+0.5*cos(o2)*sin(o1)); glVertex3f(cos(o2)*cos(o1),sin(o2),cos(o2)*sin(o1)); } void makeTexture(int w,int h){ unsigned char *p=(unsigned char *) malloc(w*h*3), *q; int i,j; unsigned char k; for (i=0;i<w;i++) for (j=0;j<h;j++){ q=p+3*(j*w+i); if (((i/10)%2==0)^((j/10)%2==0)) k=255; else k=0; q[0]=k; q[1]=k; q[2]=k; } tex.bind(); gluBuild2DMipmaps(GL_TEXTURE_2D,GL_RGB,w,h,GL_RGB,GL_UNSIGNED_BYTE,p); free(p); } public: DemoWindow(): Window("Fenêtre de démonstration",windowStyle(GLUT_RGBA | GLUT_DEPTH | GLUT_DOUBLE,WC_IDLE | WC_KEYBOARD)){}; void onIdle(){ redisplay(); }; void onDisplay(){ float t=0.03*glutGet(GLUT_ELAPSED_TIME); int i,j; glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); tex.bind(); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(70,(float) getWidth()/getHeight(),0.1,100); gluLookAt(0,0,2,0,0,0,0,1,0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glRotatef(0.5*t,1,0,0); glRotatef(0.7*t,0,1,0); glRotatef(0.9*t,0,0,1); for (i=0;i<N;i++){ glBegin(GL_QUAD_STRIP); for (j=0;j<=M;j++){ vertex(i,j); vertex(i+1,j); } glEnd(); } glFlush(); glutSwapBuffers(); }; void onCreate(){ glEnable(GL_DEPTH_TEST); glEnable(GL_TEXTURE_2D); printf("Generation de la texture-damier... "); makeTexture(256,256); printf("termine\nAppuyer sur [ESCAPE] pour quitter\n"); }; }; int main(){ DemoWindow w; Application::run(); }