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single_screen.c
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single_screen.c
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/*
* GLOMP - transparent multipipe OpenGL
* Copyright (C) 2007 the GLOMP team (see AUTHORS)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "single_screen.h"
#include "pbuffer.h"
/*
*Les fonction de transfert de fenetre, associer avec la recuperation des donnees GPU via pBuffer
* vont nous permettre de gerer efficacement les evenements qui surviennent lors de l'appel swapBuffer
*en effet, nous ne voulons pas que nos GPU affichent leur resultats,
*mais qu'elle l'envoie au processus maitre qui lui va les afficher
*/
static int i;
void **shmadr_fenetre1,**shmadr_fenetre2;
/*2 tableau contenant des clef pour les shm (initalise dans createAllFen)*/
static int * tabKey1;
static int * tabKey2;
static int fenetreactive=0;/*choix de la fenetre courante*/
/*Creation et initilalisation d'un tableau de nbcartes semaphores
semadrfen_in[nbcarte] et semadrfen_out[nbcarte], variables globales a tout le prog
servant a proteger la lecture et l ecriture dans la fifo
focntion appellee dans init */
static void GLOMPcreateSem()
{
int shmid;
/*les semaphores doivent etre places dans des segment de mem partage
pour eter paratges entre process*/
shmid = shmget(IPC_PRIVATE,sizeof(sem_t)*nbcarte,0666);
semadrfen_in=(sem_t *)shmat(shmid,0,0);
shmid = shmget(IPC_PRIVATE,sizeof(sem_t)*nbcarte,0666);
semadrfen_out=(sem_t *)shmat(shmid,0,0);
for(i=0;i<nbcarte;i++)
{
sem_init(&semadrfen_in[i],10,0);
sem_init(&semadrfen_out[i],10,2);
}
}
/*initialise le tableau des clef de semaphore (sert a pouvoir les eattacher entre process)*/
static void GLOMPinitTabKey()
{
/*pour creer les segment, nous avons besoin de 2 tableaux contenant des clef pour les shm*/
int j=0;
tabKey1=(int *)malloc(sizeof(void *)*nbcarte);
tabKey2=(int *)malloc(sizeof(void *)*nbcarte);
for(i=0;i<nbcarte;i++){
tabKey1[i]=9000+j;
tabKey2[i]=9000+j+1;
j=j+2;
}
}
static void * creershm_fenetre(int clef)
{
int shmid;
void * shmadr;
shmid = shmget(clef,width*height*4,0666|IPC_CREAT);
shmadr = shmat(shmid,0,0);
return shmadr;
}
void single_screen_init()
{
printf("screen init ok\n");
GLOMPcreateSem();/*procedure de creation des semaphore (cf transfertFentre)*/
GLOMPinitTabKey();
}
//creer le segment de memoire partage qui va contenir toute l'image
//c'est a dire les nbcarte pBuffer
void single_screen_init_window(int* glxattribs)
{
/*creation de la shm des fenetre des differentes cartes*/
shmadr_fenetre1=malloc(sizeof(void *)*nbcarte);
shmadr_fenetre2=malloc(sizeof(void *)*nbcarte);
for(i=0;i<nbcarte;i++)
{
shmadr_fenetre1[i]=creershm_fenetre(tabKey1[i]);
shmadr_fenetre2[i]=creershm_fenetre(tabKey2[i]);
}
if (client_num>0)
if (!pbuffer_init(width,height)) {
printf("Error:couldn't create pbuffer %d %d\n",width,height);
exit(0);
}
}
static void screen_dump(char* filename)
{
/*
int i;
//GLint port[4];
//lib_glGetIntegerv(GL_VIEWPORT,port);
FILE* f=fopen(filename,"wb");
fprintf(f,"P6\n# CREATOR : Volren\n%d %d\n255\n",width,height);
fflush(f);
fwrite(shmadr_fenetre1[3],width*4*height,1,f);
fclose(f);
*/
int i;
int width=500, height=400;
char* mem=(char*)malloc(sizeof(char)*width*3);
FILE* f=fopen(filename,"wb");
fprintf(f,"P6\n# CREATOR : Volren\n%d %d\n255\n",width,height);
for(i=height-1;i>=0;i--)
{
lib_glReadPixels(0,i,width,1,GL_RGB,GL_UNSIGNED_BYTE,mem);
fwrite(mem,width*3,1,f);
}
fclose(f);
free(mem);
}
//lecture de la fenetre pour copie vers le segment de memoire
//vu qu'il y a une recipoie vers un shm, ceci doit etre proteger (ici avec un semaphore)
void lire_fenetre()
{
sem_wait(&semadrfen_out[client_num]);
int totalload=0;
int beforeload=0;
int startload=0;
for(i=0;i<nbcarte;i++)
{
totalload+=client_load[i];
if (i<client_num)
beforeload+=client_load[i];
}
int heightclient=(double)client_load[client_num]/(double)totalload*height;
startload=height*beforeload/totalload;
// char nom[20];
// sprintf(nom,"file%d.pnm",client_num);
// screen_dump(nom);
if(fenetreactive==0){
lib_glReadPixels(0,startload,width,heightclient,GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, shmadr_fenetre1[client_num]);
}else {
lib_glReadPixels(0,startload,width,heightclient,GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, shmadr_fenetre2[client_num]);
}
sem_post(&semadrfen_in[client_num]);
fenetreactive=(fenetreactive+1)%2;
}
//lecrture depuis le segment de memoire pour ecriture dans le buffer d'affichage
void ecrire_fenetre()
{
int * heightclient;
heightclient = malloc(sizeof(int)*nbcarte);
float position=0.f;
int totalload=0;
lib_glMatrixMode( GL_PROJECTION );
lib_glPushMatrix();
lib_glLoadIdentity();
lib_glOrtho( 0.0, width, 0.0, height, 0.0, 2.0 );
lib_glMatrixMode( GL_MODELVIEW );
lib_glPushMatrix();
lib_glLoadIdentity();
lib_glViewport( 0, 0, width, height );
for(i=0;i<nbcarte;i++)
{
totalload+=client_load[i];
}
for(i=0;i<nbcarte;i++)
{
heightclient[i]=((double)client_load[i]/(double)totalload)*height;
}
position=heightclient[0];
if(fenetreactive==0)
for(i=1;i<nbcarte;i++)
{
lib_glRasterPos2f(0.f,position);
sem_wait(&semadrfen_in[i]);
lib_glDrawPixels(width,heightclient[i],GL_BGRA,GL_UNSIGNED_INT_8_8_8_8_REV,shmadr_fenetre1[i]);
// screen_dump("./toto.pnm");
sem_post(&semadrfen_out[i]);
position=position+heightclient[i];
}
else
for(i=1;i<nbcarte;i++)
{
lib_glRasterPos2f(0.f,position);
sem_wait(&semadrfen_in[i]);
lib_glDrawPixels(width,heightclient[i],GL_BGRA,GL_UNSIGNED_INT_8_8_8_8_REV,shmadr_fenetre2[i]);
sem_post(&semadrfen_out[i]);
position=position+heightclient[i];
}
lib_glMatrixMode( GL_PROJECTION );
lib_glPopMatrix();
lib_glMatrixMode( GL_MODELVIEW );
lib_glPopMatrix();
// XXX FIXME replace /nbcarte with load balancing
lib_glViewport(0,0,width,height/nbcarte);
fenetreactive=(fenetreactive+1)%2;
free(heightclient);
//if(DEBUG){printf("fin ECRIREFEN !!\n");}
}
void single_screen_swap(Display *dpy, GLXDrawable drawable)
{
if (client_num>0)
{
lire_fenetre();
}
else
{
ecrire_fenetre();//si on est dans le maitre, on recupere les buffers
lib_glXSwapBuffers(dpy, drawable);//et on utilise la vrai fonction swapbuffer
}
}