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starting VGA driver

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This commit is contained in:
Frater 2026-02-15 18:31:40 +01:00
commit 0775fe6193
13 changed files with 1528 additions and 682 deletions
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29
src/drivers/gfx_cgam.asm
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@ -31,7 +31,6 @@
%define CGA_STRIDE 80
%define CGA_ODD_BANK 0x2000
;
; bit : descr
; 0 : text color : 0=black, 1=white
@ -78,6 +77,7 @@
%define MOUSE_HIDE 11
%define MOUSE_SHOW 12
%define MOUSE_MOVE 13
%define MOUSE_DRAW 14
; ------------------------------------------------------------
; COMMENTAIRE SUR LA MÉTHODE D'APPEL
@ -105,6 +105,7 @@ graph_driver:
dw cga_mouse_hide ; déplacement du curseur
dw cga_mouse_show ; déplacement du curseur
dw cga_mouse_cursor_move ; déplacement du curseur
dw cga_cursor_draw
; ------------------------------------------------------------
; initialise le mode graphique (via l'int 10h)
@ -112,7 +113,7 @@ graph_driver:
; ce mode est entrelacé, un bit/pixel, 8 pixels par octet
; ------------------------------------------------------------
cga_init:
mov ax, BDA_DATA_SEG
mov ax, BDA_CUSTOM_SEG
mov ds, ax
; init graphics mode
@ -180,7 +181,7 @@ cga_set_writemode:
push fs
push ax
mov ax, BDA_DATA_SEG
mov ax, BDA_CUSTOM_SEG
mov fs,ax
mov ax, .mode
@ -211,7 +212,7 @@ cga_set_charpos:
pusha
push fs
mov ax,BDA_DATA_SEG
mov ax,BDA_CUSTOM_SEG
mov fs,ax
; store x,y en pixel
@ -314,7 +315,7 @@ cga_putc:
mov bx, VIDEO_SEG
mov es, bx
mov bx, BDA_DATA_SEG
mov bx, BDA_CUSTOM_SEG
mov fs, bx
mov ax, .car
@ -1267,7 +1268,7 @@ cga_mouse_hide:
pusha ; Sauvegarder TOUS les registres 32-bits
push ds
mov ax, BDA_DATA_SEG
mov ax, BDA_CUSTOM_SEG
mov ds, ax
; Décrémenter le compteur
@ -1295,7 +1296,7 @@ cga_mouse_show:
pusha
push ds
mov ax, BDA_DATA_SEG
mov ax, BDA_CUSTOM_SEG
mov ds, ax
; Incrémenter le compteur
@ -1327,7 +1328,7 @@ cga_mouse_cursor_move:
push es
; move Data Segment
mov ax, BDA_DATA_SEG
mov ax, BDA_CUSTOM_SEG
mov ds, ax
cmp byte [BDA_MOUSE + mouse.cur_counter], 0
@ -1437,10 +1438,7 @@ cga_cursor_restorebg:
ret
; ============================================================
; gfx_cursor_draw_rm16_i386_self
; Entrée:
; DS = BDA_DATA_SEG
; Sortie: rien
; cga_cursor_draw
; Détruit: registres sauvegardés/restaurés (PUSHA/POPA)
; ============================================================
%define .height word [bp-2]
@ -1456,24 +1454,23 @@ cga_cursor_draw:
push gs
cld ; Sécurité : Direction avant
mov ax, BDA_DATA_SEG
mov ax, BDA_CUSTOM_SEG
mov ds, ax
mov ax, VIDEO_SEG
mov es, ax
; --- CLIPPING VERTICAL ---
mov dx, [ds:BDA_MOUSE + mouse.y]
cmp dx, 200
mov bx, GFX_HEIGHT
cmp dx, bx
jae .exit_total
mov ax, 16
mov bx, 200
sub bx, dx ; 200-y
cmp ax, bx
jbe .y_ok ; y<= 200-16
mov ax, bx
.y_ok:
mov .height, ax