feat: ensemble de fonctions permettant la gestion de l'affichage en mode VGA
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#include "vga.h"
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#include "memory.h"
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#include "asm.h"
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#include "port.h"
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#include "modes.c"
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#include "8x8fnt.c"
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#include "8x16fnt.c"
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/* Registres VGAs */
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#define sequencer 0x3c4
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#define misc 0x3c2
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#define ccrt 0x3D4
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#define attribs 0x3c0
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#define graphics 0x3ce
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#define state 0x3da
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/* Taille d'un plan de bit */
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#define planesize 0x10000
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static u16 resX,resY; /* resolution x,y en caractères*/
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static u16 cursX,cursY; /* position du curseur */
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static u8 pages,activepage; /* nombre de pages disponibles N° de la page active*/
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static u32 linesize,pagesize;/* Taille d'une ligne et d'une page */
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static u8 vmode=0xFF,color; /* mode en cours d'utilisation et profondeur */
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static u32 basemem; /* Adresse de la mémoire vidéo */
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static bool scrolling,graphic;/* Activation du défilement, Flag du mode graphique */
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static u8 font; /* n° font active */
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/*******************************************************************************/
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/* Attend la retrace verticale */
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void waitvretrace (void)
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{
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while ((inb(state)&8)==0);
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}
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/*******************************************************************************/
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/* Attend la retrace horizontale */
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void waithretrace (void)
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{
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while ((inb(state)&1)==0);
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}
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/*******************************************************************************/
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/* Active l'affichage du curseur de texte */
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void enablecursor (void)
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{
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u8 curs;
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/* active le curseur hardware */
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outb(ccrt, 10);
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curs = inb(ccrt+1)&~32;
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outb(ccrt+1, curs);
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/* fixe la position du curseur hardware */
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gotoscr(cursX,cursY);
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}
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/*******************************************************************************/
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/* Desactive l'affichage du curseur de texte */
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void disablecursor (void)
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{
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u8 curs;
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/* desactive le curseur hardware */
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outb(ccrt, 10);
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curs = inb(ccrt+1)|32;
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outb(ccrt+1, curs);
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}
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/*******************************************************************************/
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/* Active le scrolling en cas de débordement d'écran */
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void enablescroll (void)
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{
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scrolling=true;
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}
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/*******************************************************************************/
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/* Desactive le scrolling en cas de débordement d'écran */
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void disablescroll (void)
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{
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scrolling=false;
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}
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/*******************************************************************************/
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/* Utilise le plan de bit spécifié */
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void useplane(u8 plan)
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{
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u8 mask;
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plan &= 3;
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mask = 1 << plan;
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/* choisi le plan de lecture */
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outb(graphics, 4);
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outb(graphics+1, plan);
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/* choisi le plan d'ecriture */
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outb(sequencer, 2);
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outb(sequencer+1, mask);
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}
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/*******************************************************************************/
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/* Renvoie l'adresse du segment video */
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u32 getbase(void)
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{
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u32 base;
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outb(graphics, 6);
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base = inb(graphics+1);
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base >>= 2;
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base &= 3;
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switch(base)
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{
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case 0:
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case 1:
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base = 0xA0000;
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break;
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case 2:
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base = 0xB0000;
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break;
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case 3:
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base = 0xB8000;
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break;
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}
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return base;
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}
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/*******************************************************************************/
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/* efface l'écran */
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void (*cls)(void);
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void cls_text (void)
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{
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gotoscr(0,0);
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memset((u8 *)(basemem+activepage*pagesize),0,pagesize,1);
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}
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void cls_chain (void)
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{
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gotoscr(0,0);
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memset((u8 *)(basemem+activepage*pagesize),0,pagesize,1);
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}
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void cls_unchain (void)
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{
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gotoscr(0,0);
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int i;
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for(i=0;i<4;i++)
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{
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useplane(i);
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memset((u8 *)(basemem+activepage*pagesize),0,pagesize,1);
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}
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}
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/*******************************************************************************/
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/* fixe la position du curseur texte */
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void gotoscr(u16 x,u16 y)
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{
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u16 pos;
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pos=(cursX+cursY*resX)/2;
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cursX=x;
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cursY=y;
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outb(ccrt,0x0E);
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outb(ccrt+1,(u8)(pos&0x00FF));
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outb(ccrt,0x0D);
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outb(ccrt+1,(u8)((pos&0xFF00)>>8));
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}
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/*******************************************************************************/
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/* Fait defiler l'ecran de n lignes vers le haut */
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void (*scroll)(u8 lines);
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void scroll_unchain(u8 lines)
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{
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u8 i;
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for(i=0;i<4;i++)
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{
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useplane(i);
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memcpy((u8*)(basemem+linesize*8*lines),(u8*)basemem,pagesize-linesize*8*lines,1);
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memset((u8*)(basemem+pagesize-linesize*8*lines),0,linesize*8*lines,1);
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}
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}
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void scroll_chain(u8 lines)
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{
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memcpy((u8*)basemem+linesize*8*lines,(u8*)basemem,pagesize-linesize*8*lines,1);
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memset((u8*)(basemem+pagesize-linesize*8*lines),0,linesize*8*lines,1);
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}
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void scroll_text(u8 lines)
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{
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memcpy((u8*)basemem+linesize*lines,(u8*)basemem,pagesize-linesize*lines,1);
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memset((u8*)(basemem+pagesize-linesize*lines),0,linesize*lines,1);
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}
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/*******************************************************************************/
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/* Affiche le caractère a l'écran */
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void (*showchar)(u8 thechar);
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void showchar_graphic(u8 thechar)
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{
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u8 x,y,pattern,color;
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for(y=0;y<8;y++)
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{
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pattern=font8x8[thechar*8+y];
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for(x=0;x<8;x++)
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{
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color=((pattern>>(7-x))&0x1); /* mettre un ROL importé depuis asm */
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writepxl(cursX*8+x,cursY*8+y,color*7);
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}
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}
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if (++cursX>=resX)
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{
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cursX=0;
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if (++cursY>=resY)
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{
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scroll(1);
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cursY=resY-1;
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}
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}
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}
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void showchar_text(u8 thechar)
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{
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u8 *screen;
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screen = (u8 *)basemem+activepage*pagesize+2*(cursX+cursY*resX);
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*screen = thechar;
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*(++screen) = 0x07;
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if (++cursX>=resX)
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{
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cursX=0;
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if (++cursY>=resY)
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{
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scroll(1);
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cursY=resY-1;
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}
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}
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gotoscr(cursX,cursY);
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}
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/*******************************************************************************/
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/* Ecrit un pixel a l'écran */
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void (*writepxl)(u16 x, u16 y, u32 c);
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void writepxl_1bit(u16 x, u16 y, u32 c)
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{
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u8* off;
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u8 mask;
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c = (c & 1) * 0xFF;
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off = (u8*)(basemem+activepage*pagesize+linesize * y + x / 8);
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x = (x & 7) * 1;
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mask = 0x80 >> x;
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*off= ((*off) & ~mask) | (c & mask);
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}
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void writepxl_2bits(u16 x, u16 y, u32 c)
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{
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u8 *off;
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u8 mask;
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c = (c & 3) * 0x55;
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off = (u8*)(basemem+activepage*pagesize+linesize * y + x / 4);
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x = (x & 3) * 2;
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mask = 0xC0 >> x;
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*off= ((*off) & ~mask) | (c & mask);
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}
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void writepxl_4bits(u16 x, u16 y, u32 c)
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{
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u8* off;
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u8 mask, p, pmask;
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off = (u8*)(basemem+activepage*pagesize+linesize * y + x / 8);
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x = (x & 7) * 1;
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mask = 0x80 >> x;
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pmask = 1;
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for(p = 0; p < 4; p++)
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{
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useplane(p);
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if(pmask & c)
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*off= ((*off) | mask);
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else
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*off= ((*off) & ~mask);
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pmask <<= 1;
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}
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}
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void writepxl_8bits(u16 x, u16 y, u32 c)
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{
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u8* off;
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off = (u8*)(basemem+activepage*pagesize+linesize * y + x);
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*off=c;
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}
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void writepxl_8bitsunchain(u16 x, u16 y, u32 c)
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{
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u8* off;
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off = (u8*)(basemem+activepage*pagesize+linesize * y + x / 4);
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useplane(x & 3);
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*off=c;
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}
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/*******************************************************************************/
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/* Change le mode video courant */
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u32 setvmode(u8 mode)
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{
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u8 *def,i,gmode;
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/* Récupere la definition des registres VGA en fonction du mode
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graphique : >0x80
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text : 0x00 - 0x7F
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*/
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if (mode>=0x80)
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{
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gmode=mode-0x80;
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if (gmode>maxgraphmode) return 1; /* mode inexistant */
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def=graphmodes[gmode];
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graphic=true;
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}
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else
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{
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if (mode>maxtextmode) return 1; /* mode inexistant */
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def=textmodes[mode];
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graphic=false;
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loadfont(font8x8,8,1);
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loadfont(font8x16,16,0);
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}
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/* Initialise les registre "divers" */
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outb(misc,def[0]);
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/* Initialise les registre d'etat */
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outb(state,0x00);
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/* Initialise le séquenceur */
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outreg(sequencer,&def[1],5);
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/* Debloque le verouillage des registres controleur CRT */
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outb(ccrt,0x11);
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outb(ccrt+1,0x0E);
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/* Initialise le controleur CRT */
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outreg(ccrt,&def[6],25);
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/* Initialise le controleur graphique */
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outreg(graphics,&def[31],9);
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inb(state);
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/* Initialise le controleur d'attributs */
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outregsame(attribs,&def[40],21);
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inb(state);
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outb(attribs,0x20);
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/* Récupere depuis la table de définition des mode la résolution et la
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profondeur (en bits) */
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resX=def[61];
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resY=def[62];
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color=def[63];
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/* Remet la position du curseur logiciel a 0,0 */
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cursX=0;
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cursY=0;
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/* Initialise l'adresse des procedures de gestion graphique et les differentes
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variables en fonction de la profondeur et du mode*/
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if (!graphic)
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{
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/* mode texte */
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linesize=resX*2;
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writepxl=NULL; /* pas d'affichage de pixels */
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showchar=showchar_text;
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scroll=scroll_text;
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cls=cls_text;
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pagesize=resY*linesize;
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}
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else
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{
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switch(color)
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{
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case 1:
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/* mode N&B */
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linesize=resX;
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writepxl=writepxl_1bit;
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cls=cls_chain;
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scroll=scroll_chain;
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break;
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case 2:
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/* mode 4 couleurs */
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linesize=(resX<<1);
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writepxl=writepxl_2bits;
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cls=cls_chain;
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scroll=scroll_chain;
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break;
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case 4:
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/* mode 16 couleurs */
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linesize=resX;
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writepxl=writepxl_4bits;
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cls=cls_unchain;
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scroll=scroll_unchain;
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break;
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case 8:
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/* mode 256 couleurs */
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if (def[5]==0x0E)
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{
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/* mode chainé (plus rapide mais limité en mémoire) */
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linesize=(resX<<3);
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writepxl=writepxl_8bits;
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scroll=scroll_chain;
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cls=cls_chain;
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}
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else
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{
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/* mode non chainé */
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linesize=(resX<<1);
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writepxl=writepxl_8bitsunchain;
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scroll=scroll_unchain;
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cls=cls_unchain;
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}
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break;
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default:
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break;
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}
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showchar=showchar_graphic;
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pagesize=((resY*linesize)<<3);
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}
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/* calcul des variables d'état video */
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activepage=0;
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vmode=mode;
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pages=(planesize/pagesize);
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basemem=(def[20]<<8)+def[21]+getbase();
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return 0;
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}
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/*******************************************************************************/
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/* Récupère le mode vidéo en cours */
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u8 getvmode(void)
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{
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return vmode;
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}
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/*******************************************************************************/
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/* Charge une nouvelle police de caractère */
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u32 loadfont(u8* def,u8 size,u8 font)
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{
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if (graphics==1) return 1;
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u8 oldregs[5]={0,0,0,0,0};
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u8* base;
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u16 i;
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if (font>7) return 1;
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if (font<4)
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base = (u8 *)(getbase()+(font<<14));
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else
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base = (u8 *)(getbase()+((((font-4)<<1)+1)<<13));
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/* sauve les anciens registres */
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outb(sequencer,2);
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oldregs[0]=inb(sequencer+1);
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outb(sequencer,4);
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oldregs[1]=inb(sequencer+1);
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/* Adressage paire/impair desactivé (lineaire) */
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outb(sequencer+1, oldregs[1]|0x04);
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outb(graphics,4);
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oldregs[2]=inb(graphics+1);
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outb(graphics,5);
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oldregs[3]=inb(graphics+1);
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/* Adressage paire/impair desactivé (lineaire) */
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outb(graphics+1, oldregs[3]&~0x10);
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outb(graphics,6);
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oldregs[4]=inb(graphics+1);
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/* Adressage paire/impair desactivé (lineaire) */
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outb(graphics+1, oldregs[4] & ~0x02);
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/* utilisation du plan N°2 */
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useplane(2);
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for(i=0; i < 256; i++)
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{
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memcpy(def,base+i*32,size,1);
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def += size;
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}
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outb(sequencer,2);
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outb(sequencer+1,oldregs[0]);
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outb(sequencer,4);
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outb(sequencer+1,oldregs[1]);
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outb(graphics,4);
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outb(graphics+1,oldregs[2]);
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outb(graphics,5);
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outb(graphics+1,oldregs[3]);
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outb(graphics,6);
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outb(graphics+1,oldregs[4]);
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return 0;
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}
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/*******************************************************************************/
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/* Récupere le N° de la police de caractère en cours d'utilisation */
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u8 getfont(u8 num)
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{
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return font;
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}
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/*******************************************************************************/
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/* Fixe le N° de la police de caractère a utiliser */
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|
||||
void setfont(u8 num)
|
||||
{
|
||||
font=num&0x07;
|
||||
outb(sequencer,3);
|
||||
outb(sequencer+1,(num&0x03)+((num&0x04)<<2));
|
||||
}
|
||||
|
||||
/*******************************************************************************/
|
||||
|
||||
|
||||
Loading…
Reference in New Issue