diff options
Diffstat (limited to 'src/mesa/drivers/dos/vga.c')
| -rw-r--r-- | src/mesa/drivers/dos/vga.c | 67 |
1 files changed, 53 insertions, 14 deletions
diff --git a/src/mesa/drivers/dos/vga.c b/src/mesa/drivers/dos/vga.c index 27758f14d2..5a6447dd87 100644 --- a/src/mesa/drivers/dos/vga.c +++ b/src/mesa/drivers/dos/vga.c @@ -23,9 +23,9 @@ */ /* - * DOS/DJGPP device driver v1.7 for Mesa + * DOS/DJGPP device driver for Mesa * - * Copyright (C) 2002 - Borca Daniel + * Author: Daniel Borca * Email : dborca@users.sourceforge.net * Web : http://www.geocities.com/dborca */ @@ -123,6 +123,41 @@ vga_fini (void) } +/* Desc: Attempts to choose a suitable blitter. + * + * In : ptr to mode structure, software framebuffer bits + * Out : blitter funciton, or NULL + * + * Note: - + */ +static BLTFUNC +_choose_blitter (vl_mode *p, int fbbits) +{ + BLTFUNC blitter; + + switch (fbbits) { + case 8: + blitter = _can_mmx() ? vesa_l_dump_virtual_mmx : vesa_l_dump_virtual; + break; + case 16: + blitter = vesa_l_dump_16_to_8; + break; + case 24: + blitter = vesa_l_dump_24_to_8; + break; + case 32: + blitter = vesa_l_dump_32_to_8; + break; + default: + return NULL; + } + + return blitter; + + (void)p; +} + + /* Desc: Attempts to enter specified video mode. * * In : ptr to mode structure, refresh rate @@ -131,27 +166,31 @@ vga_fini (void) * Note: - */ static int -vga_entermode (vl_mode *p, int refresh) +vga_entermode (vl_mode *p, int refresh, int fbbits) { - if (!(p->mode & 0x4000)) { - return -1; - } - VGA.blit = _can_mmx() ? vesa_l_dump_virtual_mmx : vesa_l_dump_virtual; + if (!(p->mode & 0x4000)) { + return -1; + } - if (oldmode == -1) { - __asm("\n\ + VGA.blit = _choose_blitter(p, fbbits); + if (VGA.blit == NULL) { + return !0; + } + + if (oldmode == -1) { + __asm("\n\ movb $0x0f, %%ah \n\ int $0x10 \n\ andl $0xff, %%eax \n\ movl %%eax, %0 \n\ - ":"=g"(oldmode)::"%eax", "%ebx"); - } + ":"=g"(oldmode)::"%eax", "%ebx"); + } - __asm("int $0x10"::"a"(p->mode&0xff)); + __asm("int $0x10"::"a"(p->mode&0xff)); - return 0; + return 0; - (void)refresh; /* silence compiler warning */ + (void)refresh; /* silence compiler warning */ } |