10 #define REALPTR(s, o) (void*)(((uint32_t)(s) << 4) + (uint32_t)(o))
11 #define VBEPTR(x) REALPTR(((x) & 0xffff0000) >> 16, (x) & 0xffff)
12 #define VBEPTR_SEG(x) (((x) & 0xffff0000) >> 16)
13 #define VBEPTR_OFF(x) ((x) & 0xffff)
15 #define SAME_BPP(a, b) \
16 ((a) == (b) || (a) == 16 && (b) == 15 || (a) == 15 && (b) == 16 || (a) == 32 && (b) == 24 || (a) == 24 && (b) == 32)
18 static unsigned int make_mask(int sz, int pos);
20 static struct vbe_info *vbe_info;
21 static struct vbe_mode_info *mode_info;
22 static int pal_bits = 6;
24 void *set_video_mode(int xsz, int ysz, int bpp)
27 uint16_t *modes, best = 0;
30 /* check for VBE2 support and output some info */
32 if(!(vbe_info = vbe_get_info())) {
33 fprintf(stderr, "VESA BIOS Extensions not available\n");
37 printlog("VBE Version: %x.%x\n", vbe_info->version >> 8, vbe_info->version & 0xff);
38 if(vbe_info->version < 0x200) {
39 fprintf(stderr, "This program requires VBE 2.0 or greater. Try running UniVBE\n");
43 printlog("Graphics adapter: %s, %s (%s)\n", VBEPTR(vbe_info->oem_vendor_name_ptr),
44 VBEPTR(vbe_info->oem_product_name_ptr), VBEPTR(vbe_info->oem_product_rev_ptr));
45 printlog("Video memory: %dmb\n", vbe_info->total_mem << 6);
47 modes = VBEPTR(vbe_info->vid_mode_ptr);
50 for(i=0; i<1024; i++) { /* impose an upper limit to avoid inf-loops */
51 if(modes[i] == 0xffff) {
52 break; /* reached the end */
55 mode_info = vbe_get_mode_info(modes[i] | VBE_MODE_LFB);
56 if(!mode_info || mode_info->xres != xsz || mode_info->yres != ysz) {
59 if(SAME_BPP(mode_info->bpp, bpp)) {
65 mode_info = vbe_get_mode_info(best);
67 fprintf(stderr, "Requested video mode (%dx%d %dbpp) is unavailable\n", xsz, ysz, bpp);
71 if(vbe_set_mode(best | VBE_MODE_LFB) == -1) {
72 fprintf(stderr, "Failed to set video mode %dx%d %dbpp\n", mode_info->xres, mode_info->yres, mode_info->bpp);
76 /* attempt to set 8 bits of color per component in palettized modes */
78 pal_bits = vbe_set_palette_bits(8);
79 printlog("palette bits per color primary: %d\n", pal_bits);
82 fbsize = xsz * ysz * mode_info->num_img_pages * (bpp / CHAR_BIT);
83 return (void*)dpmi_mmap(mode_info->fb_addr, fbsize);
86 int set_text_mode(void)
92 int get_color_depth(void)
97 return mode_info->bpp;
100 int get_color_bits(int *rbits, int *gbits, int *bbits)
105 *rbits = mode_info->rmask_size;
106 *gbits = mode_info->gmask_size;
107 *bbits = mode_info->bmask_size;
111 int get_color_mask(unsigned int *rmask, unsigned int *gmask, unsigned int *bmask)
116 *rmask = make_mask(mode_info->rmask_size, mode_info->rpos);
117 *gmask = make_mask(mode_info->gmask_size, mode_info->gpos);
118 *bmask = make_mask(mode_info->bmask_size, mode_info->bpos);
122 int get_color_shift(int *rshift, int *gshift, int *bshift)
127 *rshift = mode_info->rpos;
128 *gshift = mode_info->gpos;
129 *bshift = mode_info->bpos;
133 void set_palette(int idx, int r, int g, int b)
139 vbe_set_palette(idx, col, 1, pal_bits);
142 void wait_vsync(void)
147 static unsigned int make_mask(int sz, int pos)
149 unsigned int i, mask = 0;
151 for(i=0; i<sz; i++) {