diff options
Diffstat (limited to 'src/mesa/drivers/dos/vga/vga.c')
| -rw-r--r-- | src/mesa/drivers/dos/vga/vga.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/src/mesa/drivers/dos/vga/vga.c b/src/mesa/drivers/dos/vga/vga.c new file mode 100644 index 00000000000..1888d989475 --- /dev/null +++ b/src/mesa/drivers/dos/vga/vga.c @@ -0,0 +1,226 @@ +/*
+ * Mesa 3-D graphics library
+ * Version: 4.1
+ *
+ * Copyright (C) 1999 Brian Paul All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ * DOS/DJGPP device driver v1.3 for Mesa 5.0
+ *
+ * Copyright (C) 2002 - Borca Daniel
+ * Email : [email protected]
+ * Web : http://www.geocities.com/dborca
+ */
+
+
+#include <stdlib.h>
+
+#include "vga.h"
+
+
+
+static vl_mode modes[4] = {
+ {0x13 | 0x4000, 320, 200, 320, 8, -1, 320*200},
+ {0xffff, -1, -1, -1, -1, -1, -1}
+};
+
+static word16 vga_ver;
+static int linear_selector;
+static int oldmode = -1;
+
+#define vga_color_precision 6
+
+
+
+/* Desc: Attempts to detect VGA, check video modes and create selectors.
+ *
+ * In : -
+ * Out : mode array
+ *
+ * Note: -
+ */
+static vl_mode *vga_init (void)
+{
+ int rv = 0;
+
+ if (vga_ver) {
+ return modes;
+ }
+
+ __asm("\n\
+ movw $0x1a00, %%ax \n\
+ int $0x10 \n\
+ cmpb $0x1a, %%al \n\
+ jne 0f \n\
+ cmpb $0x07, %%bl \n\
+ jb 0f \n\
+ andl $0xff, %%ebx \n\
+ movl %%ebx, %0 \n\
+ 0:":"=g"(rv)::"%eax", "%ebx");
+ if (rv == 0) {
+ return NULL;
+ }
+
+ if (_create_selector(&linear_selector, 0xa0000, 0x10000)) {
+ return NULL;
+ }
+
+ modes[0].sel = linear_selector;
+
+ vga_ver = rv;
+ return modes;
+}
+
+
+
+/* Desc: Frees all resources allocated by VGA init code.
+ *
+ * In : -
+ * Out : -
+ *
+ * Note: -
+ */
+static void vga_finit (void)
+{
+ if (vga_ver) {
+ _remove_selector(&linear_selector);
+ }
+}
+
+
+
+/* Desc: Attempts to enter specified video mode.
+ *
+ * In : ptr to mode structure, refresh rate
+ * Out : 0 if success
+ *
+ * Note: -
+ */
+static int vga_entermode (vl_mode *p, int refresh)
+{
+ if (!(p->mode & 0x4000)) {
+ return -1;
+ }
+ VGA.blit = vl_can_mmx() ? vesa_l_dump_virtual_mmx : vesa_l_dump_virtual;
+
+ if (oldmode == -1) {
+ __asm("\n\
+ movb $0x0f, %%ah \n\
+ int $0x10 \n\
+ andl $0xff, %%eax \n\
+ movl %%eax, %0 \n\
+ ":"=g"(oldmode)::"%eax", "%ebx");
+ }
+
+ __asm("int $0x10"::"a"(p->mode&0xff));
+
+ return 0;
+}
+
+
+
+/* Desc: Restores to the mode prior to first call to vga_entermode.
+ *
+ * In : -
+ * Out : -
+ *
+ * Note: -
+ */
+static void vga_restore (void)
+{
+ if (oldmode != -1) {
+ __asm("int $0x10"::"a"(oldmode));
+ }
+}
+
+
+
+/* Desc: set one palette entry
+ *
+ * In : color index, R, G, B
+ * Out : -
+ *
+ * Note: uses normalized values
+ */
+static void vga_setCI_f (int index, float red, float green, float blue)
+{
+ float max = (1 << vga_color_precision) - 1;
+
+ int _red = red * max;
+ int _green = green * max;
+ int _blue = blue * max;
+
+ __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");
+}
+
+
+
+/* Desc: set one palette entry
+ *
+ * In : color index, R, G, B
+ * Out : -
+ *
+ * Note: uses integer values
+ */
+static void vga_setCI_i (int index, int red, int green, int blue)
+{
+ __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");
+}
+
+
+
+/* Desc: retrieve CI precision
+ *
+ * In : -
+ * Out : precision in bits
+ *
+ * Note: -
+ */
+static int vga_getCIprec (void)
+{
+ return vga_color_precision;
+}
+
+
+
+/*
+ * the driver
+ */
+vl_driver VGA = {
+ vga_init,
+ vga_entermode,
+ NULL,
+ vga_setCI_f,
+ vga_setCI_i,
+ vga_getCIprec,
+ vga_restore,
+ vga_finit
+};
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