10 #include <sys/nearptr.h>
12 #define REALPTR(s, o) (void*)(((uint32_t)(s) << 4) - __djgpp_base_address + (uint32_t)(o))
14 #define REALPTR(s, o) (void*)(((uint32_t)(s) << 4) + (uint32_t)(o))
17 #define VBEPTR(x) REALPTR(((x) & 0xffff0000) >> 16, (x) & 0xffff)
18 #define VBEPTR_SEG(x) (((x) & 0xffff0000) >> 16)
19 #define VBEPTR_OFF(x) ((x) & 0xffff)
21 #define SAME_BPP(a, b) \
22 ((a) == (b) || ((a) == 16 && (b) == 15) || ((a) == 15 && (b) == 16) || \
23 ((a) == 32 && (b) == 24) || ((a) == 24 && (b) == 32))
25 static unsigned int make_mask(int sz, int pos);
27 static struct vbe_info *vbe_info;
28 static struct vbe_mode_info *mode_info;
29 static int pal_bits = 6;
31 static void *vpgaddr[2];
34 void *set_video_mode(int xsz, int ysz, int bpp)
37 static uint16_t *modes;
39 unsigned int fbsize, pgsize;
42 __djgpp_nearptr_enable();
45 /* check for VBE2 support and output some info */
47 if(!(vbe_info = vbe_get_info())) {
48 fprintf(stderr, "VESA BIOS Extensions not available\n");
52 printf("VBE Version: %x.%x\n", vbe_info->version >> 8, vbe_info->version & 0xff);
53 if(vbe_info->version < 0x200) {
54 fprintf(stderr, "This program requires VBE 2.0 or greater. Try running UniVBE\n");
58 printf("Graphics adapter: %s, %s (%s)\n", (char*)VBEPTR(vbe_info->oem_vendor_name_ptr),
59 (char*)VBEPTR(vbe_info->oem_product_name_ptr), (char*)VBEPTR(vbe_info->oem_product_rev_ptr));
60 printf("Video memory: %dkb\n", vbe_info->total_mem << 6);
62 modes = VBEPTR(vbe_info->vid_mode_ptr);
65 for(i=0; i<1024; i++) { /* impose an upper limit to avoid inf-loops */
66 if(modes[i] == 0xffff) {
67 break; /* reached the end */
70 mode_info = vbe_get_mode_info(modes[i] | VBE_MODE_LFB);
71 if(!mode_info || mode_info->xres != xsz || mode_info->yres != ysz) {
74 if(SAME_BPP(mode_info->bpp, bpp)) {
80 mode_info = vbe_get_mode_info(best);
82 fprintf(stderr, "Requested video mode (%dx%d %dbpp) is unavailable\n", xsz, ysz, bpp);
86 if(vbe_set_mode(best | VBE_MODE_LFB) == -1) {
87 fprintf(stderr, "Failed to set video mode %dx%d %dbpp\n", mode_info->xres, mode_info->yres, mode_info->bpp);
91 /* attempt to set 8 bits of color per component in palettized modes */
93 pal_bits = vbe_set_palette_bits(8);
94 printf("palette bits per color primary: %d\n", pal_bits);
98 printf("avail video pages: %d\n", mode_info->num_img_pages);
99 printf("bytes per scanline: %d (%d pixels)\n", vbe_get_scanlen(VBE_SCANLEN_BYTES),
100 vbe_get_scanlen(VBE_SCANLEN_PIXELS));
102 pgsize = xsz * ysz * (bpp / CHAR_BIT);
103 fbsize = mode_info->num_img_pages * pgsize;
104 vpgaddr[0] = (void*)dpmi_mmap(mode_info->fb_addr, fbsize);
106 if(mode_info->num_img_pages > 1) {
107 vpgaddr[1] = (char*)vpgaddr[0] + pgsize;
114 int set_text_mode(void)
120 int get_color_depth(void)
125 return mode_info->bpp;
128 int get_color_bits(int *rbits, int *gbits, int *bbits)
133 *rbits = mode_info->rmask_size;
134 *gbits = mode_info->gmask_size;
135 *bbits = mode_info->bmask_size;
139 int get_color_mask(unsigned int *rmask, unsigned int *gmask, unsigned int *bmask)
144 *rmask = make_mask(mode_info->rmask_size, mode_info->rpos);
145 *gmask = make_mask(mode_info->gmask_size, mode_info->gpos);
146 *bmask = make_mask(mode_info->bmask_size, mode_info->bpos);
150 int get_color_shift(int *rshift, int *gshift, int *bshift)
155 *rshift = mode_info->rpos;
156 *gshift = mode_info->gpos;
157 *bshift = mode_info->bpos;
161 void set_palette(int idx, int r, int g, int b)
167 vbe_set_palette(idx, col, 1, pal_bits);
170 void *page_flip(int vsync)
177 /* page flipping not supported */
181 bufidx = ++frame & 1;
183 y = bufidx ? mode_info->yres : 0;
184 nextaddr = vpgaddr[bufidx];
186 when = vsync ? VBE_SET_DISP_START_VBLANK : VBE_SET_DISP_START_NOW;
187 if(vbe_set_disp_start(0, y, when) == -1) {
191 if(vsync == FLIP_VBLANK_WAIT) {
197 static unsigned int make_mask(int sz, int pos)
199 unsigned int i, mask = 0;
201 for(i=0; i<sz; i++) {