*/
/*
- * DOS/DJGPP device driver v1.5 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
*/
#include "vga.h"
-
static vl_mode modes[] = {
- {0x13 | 0x4000, 320, 200, 320, 8, -1, 320*200},
- {0xffff, -1, -1, -1, -1, -1, -1}
+ {
+ /* .xres = */ 320,
+ /* .yres = */ 200,
+ /* .bpp = */ 8,
+ /* .mode = */ 0x13 | 0x4000,
+ /* .scanlen = */ 320,
+ /* .sel = */ -1,
+ /* .gran = */ 320*200
+ },
+ {
+ /* .xres = */ -1,
+ /* .yres = */ -1,
+ /* .bpp = */ -1,
+ /* .mode = */ 0xffff,
+ /* .scanlen = */ -1,
+ /* .sel = */ -1,
+ /* .gran = */ -1
+ }
};
static word16 vga_ver;
#define vga_color_precision 6
-
/* Desc: Attempts to detect VGA, check video modes and create selectors.
*
* In : -
*
* Note: -
*/
-static vl_mode *vga_init (void)
+static vl_mode *
+vga_init (void)
{
- int rv = 0;
+ int rv = 0;
- if (vga_ver) {
- return modes;
- }
+ if (vga_ver) {
+ return modes;
+ }
- __asm("\n\
+ __asm("\n\
movw $0x1a00, %%ax \n\
int $0x10 \n\
cmpb $0x1a, %%al \n\
jb 0f \n\
andl $0xff, %%ebx \n\
movl %%ebx, %0 \n\
- 0:":"=g"(rv)::"%eax", "%ebx");
- if (rv == 0) {
- return NULL;
- }
+ 0:":"=g"(rv)::"%eax", "%ebx");
+ if (rv == 0) {
+ return NULL;
+ }
- if (_create_selector(&linear_selector, 0xa0000, 0x10000)) {
- return NULL;
- }
+ if (_create_selector(&linear_selector, 0xa0000, 0x10000)) {
+ return NULL;
+ }
- modes[0].sel = linear_selector;
+ modes[0].sel = linear_selector;
- vga_ver = rv;
- return modes;
+ vga_ver = rv;
+ return modes;
}
-
/* Desc: Frees all resources allocated by VGA init code.
*
* In : -
*
* Note: -
*/
-static void vga_fini (void)
+static void
+vga_fini (void)
{
- if (vga_ver) {
- _remove_selector(&linear_selector);
- }
+ if (vga_ver) {
+ _remove_selector(&linear_selector);
+ }
}
+/* 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.
*
*
* Note: -
*/
-static int vga_entermode (vl_mode *p, int refresh)
+static int
+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;
+ }
+
+ VGA.blit = _choose_blitter(p, fbbits);
+ if (VGA.blit == NULL) {
+ return !0;
+ }
- if (oldmode == -1) {
- __asm("\n\
+ 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 */
}
-
/* Desc: Restores to the mode prior to first call to vga_entermode.
*
* In : -
*
* Note: -
*/
-static void vga_restore (void)
+static void
+vga_restore (void)
{
- if (oldmode != -1) {
- __asm("int $0x10"::"a"(oldmode));
- oldmode = -1;
- }
+ if (oldmode != -1) {
+ __asm("int $0x10"::"a"(oldmode));
+ oldmode = -1;
+ }
}
-
/* Desc: set one palette entry
*
* In : color index, R, G, B
*
* Note: uses integer values
*/
-static void vga_setCI_i (int index, int red, int green, int blue)
+static void
+vga_setCI_i (int index, int red, int green, int blue)
{
#if 0
- __asm("\n\
- movw $0x1010, %%ax \n\
- movb %1, %%dh \n\
- movb %2, %%ch \n\
- int $0x10 \n\
- "::"b"(index), "m"(red), "m"(green), "c"(blue):"%eax", "%edx");
+ __asm("\n\
+ movw $0x1010, %%ax \n\
+ movb %1, %%dh \n\
+ movb %2, %%ch \n\
+ int $0x10 \n\
+ "::"b"(index), "m"(red), "m"(green), "c"(blue):"%eax", "%edx");
#else
- outportb(0x03C8, index);
- outportb(0x03C9, red);
- outportb(0x03C9, green);
- outportb(0x03C9, blue);
+ outportb(0x03C8, index);
+ outportb(0x03C9, red);
+ outportb(0x03C9, green);
+ outportb(0x03C9, blue);
#endif
}
-
/* Desc: set one palette entry
*
* In : color index, R, G, B
*
* Note: uses normalized values
*/
-static void vga_setCI_f (int index, float red, float green, float blue)
+static void
+vga_setCI_f (int index, float red, float green, float blue)
{
- float max = (1 << vga_color_precision) - 1;
+ float max = (1 << vga_color_precision) - 1;
- vga_setCI_i(index, (int)(red * max), (int)(green * max), (int)(blue * max));
+ vga_setCI_i(index, (int)(red * max), (int)(green * max), (int)(blue * max));
}
-
/* Desc: state retrieval
*
* In : parameter name, ptr to storage
*
* Note: -
*/
-static int vga_get (int pname, int *params)
+static int
+vga_get (int pname, int *params)
{
- switch (pname) {
- case VL_GET_CI_PREC:
- params[0] = vga_color_precision;
- break;
- default:
- return -1;
- }
- return 0;
+ switch (pname) {
+ case VL_GET_CI_PREC:
+ params[0] = vga_color_precision;
+ break;
+ default:
+ return -1;
+ }
+ return 0;
}
-
/*
* the driver
*/
vl_driver VGA = {
- vga_init,
- vga_entermode,
- NULL,
- vga_setCI_f,
- vga_setCI_i,
- vga_get,
- vga_restore,
- vga_fini
+ vga_init,
+ vga_entermode,
+ NULL,
+ vga_setCI_f,
+ vga_setCI_i,
+ vga_get,
+ vga_restore,
+ vga_fini
};
projects / mesa.git / blobdiff