10 #define SAME_BPP(a, b) \
11 ((a) == (b) || ((a) == 16 && (b) == 15) || ((a) == 15 && (b) == 16) || \
12 ((a) == 32 && (b) == 24) || ((a) == 24 && (b) == 32))
14 void (*blit_frame)(void*, int);
16 int resizefb(int x, int y, int bpp);
18 static void blit_frame_lfb(void *pixels, int vsync);
19 static void blit_frame_banked(void *pixels, int vsync);
20 static uint32_t calc_mask(int sz, int pos);
22 static struct video_mode *vmodes;
23 static int num_vmodes;
25 static int vbe_init_ver;
26 static struct vbe_info vbe;
29 static struct video_mode *curmode;
30 static void *vpgaddr[2];
31 static int frontidx, backidx;
32 static int pgcount, pgsize, fbsize;
37 int i, num, max_modes;
38 struct video_mode *vmptr;
40 if(vbe_info(&vbe) == -1) {
41 fprintf(stderr, "failed to retrieve VBE information\n");
44 vbe_print_info(stdout, &vbe);
48 if(!(vmodes = malloc(max_modes * sizeof *vmodes))) {
49 fprintf(stderr, "failed to allocate video modes list\n");
53 num = vbe_num_modes(&vbe);
54 for(i=0; i<num; i++) {
55 struct vbe_mode_info minf;
57 if(vbe_mode_info(vbe.modes[i], &minf) == -1) {
61 if(num_vmodes >= max_modes) {
62 int newmax = max_modes ? (max_modes << 1) : 16;
63 if(!(vmptr = realloc(vmodes, newmax * sizeof *vmodes))) {
64 fprintf(stderr, "failed to grow video mode list (%d)\n", newmax);
72 vmptr = vmodes + num_vmodes++;
73 memset(vmptr, 0, sizeof *vmptr);
74 vmptr->mode = vbe.modes[i];
75 vmptr->xsz = minf.xres;
76 vmptr->ysz = minf.yres;
77 vmptr->bpp = minf.bpp;
78 vmptr->pitch = minf.scanline_bytes;
79 if(minf.mem_model == VBE_TYPE_DIRECT) {
80 vmptr->rbits = minf.rsize;
81 vmptr->gbits = minf.gsize;
82 vmptr->bbits = minf.bsize;
83 vmptr->rshift = minf.rpos;
84 vmptr->gshift = minf.gpos;
85 vmptr->bshift = minf.bpos;
86 vmptr->rmask = calc_mask(minf.rsize, minf.rpos);
87 vmptr->gmask = calc_mask(minf.gsize, minf.gpos);
88 vmptr->bmask = calc_mask(minf.bsize, minf.bpos);
89 vmptr->bpp = vmptr->rbits + vmptr->gbits + vmptr->bbits;
91 if(minf.attr & VBE_ATTR_LFB) {
92 vmptr->fb_addr = minf.fb_addr;
94 vmptr->bank_size = (uint32_t)minf.bank_size * 1024;
95 if(!vmptr->bank_size) {
96 vmptr->bank_size = 65536;
99 vmptr->max_pages = minf.num_img_pages;
101 printf("%04x: ", vbe.modes[i]);
102 vbe_print_mode_info(stdout, &minf);
106 vbe_init_ver = VBE_VER_MAJOR(vbe.ver);
110 void cleanup_video(void)
115 struct video_mode *video_modes(void)
120 int num_video_modes(void)
125 struct video_mode *get_video_mode(int idx)
127 if(idx == VMODE_CURRENT) {
133 int match_video_mode(int xsz, int ysz, int bpp)
136 struct video_mode *vm;
138 for(i=0; i<num_vmodes; i++) {
140 if(vm->xsz != xsz || vm->ysz != ysz) continue;
141 if(SAME_BPP(vm->bpp, bpp)) {
144 if(vm->bpp == bpp) break;
148 fprintf(stderr, "failed to find video mode %dx%d %d bpp)\n", xsz, ysz, bpp);
154 int find_video_mode(int mode)
157 struct video_mode *vm;
160 for(i=0; i<num_vmodes; i++) {
161 if(vm->mode == mode) return i;
166 void *set_video_mode(int idx, int nbuf)
169 struct video_mode *vm = vmodes + idx;
171 if(curmode == vm) return vpgaddr[0];
173 printf("setting video mode %x (%dx%d %d bpp)\n", (unsigned int)vm->mode,
174 vm->xsz, vm->ysz, vm->bpp);
177 mode = vm->mode | VBE_MODE_LFB;
178 if(vbe_setmode(mode) == -1) {
180 if(vbe_setmode(mode) == -1) {
181 fprintf(stderr, "failed to set video mode %x\n", (unsigned int)vm->mode);
184 printf("Warning: failed to get a linear framebuffer. falling back to banked mode\n");
187 /* unmap previous video memory mapping, if there was one (switching modes) */
188 if(vpgaddr[0] && vpgaddr[0] != (void*)0xa0000) {
189 dpmi_munmap(vpgaddr[0]);
190 vpgaddr[0] = vpgaddr[1] = 0;
194 if(nbuf < 1) nbuf = 1;
195 if(nbuf > 2) nbuf = 2;
196 pgcount = nbuf > vm->max_pages ? vm->max_pages : nbuf;
197 pgsize = vm->ysz * vm->pitch;
198 fbsize = pgcount * pgsize;
200 printf("pgcount: %d, pgsize: %d, fbsize: %d\n", pgcount, pgsize, fbsize);
201 printf("phys addr: %p\n", (void*)vm->fb_addr);
205 vpgaddr[0] = (void*)dpmi_mmap(vm->fb_addr, fbsize);
207 fprintf(stderr, "failed to map framebuffer (phys: %lx, size: %d)\n",
208 (unsigned long)vm->fb_addr, fbsize);
212 memset(vpgaddr[0], 0xaa, pgsize);
215 vpgaddr[1] = (char*)vpgaddr[0] + pgsize;
217 page_flip(FLIP_NOW); /* start with the second page visible */
219 frontidx = backidx = 0;
223 blit_frame = blit_frame_lfb;
226 vpgaddr[0] = (void*)0xa0000;
229 blit_frame = blit_frame_banked;
232 /* allocate main memory framebuffer */
233 if(resizefb(vm->xsz, vm->ysz, vm->bpp) == -1) {
234 fprintf(stderr, "failed to allocate %dx%d (%d bpp) framebuffer\n", vm->xsz,
243 int set_text_mode(void)
245 /* unmap previous video memory mapping, if there was one (switching modes) */
246 if(vpgaddr[0] && vpgaddr[0] != (void*)0xa0000) {
247 dpmi_munmap(vpgaddr[0]);
248 vpgaddr[0] = vpgaddr[1] = 0;
256 void *page_flip(int vsync)
259 /* page flipping not supported */
263 vbe_swap(backidx ? pgsize : 0, vsync ? VBE_SWAP_VBLANK : VBE_SWAP_NOW);
265 backidx = (backidx + 1) & 1;
267 return vpgaddr[backidx];
271 static void blit_frame_lfb(void *pixels, int vsync)
273 if(vsync) wait_vsync();
274 memcpy64(vpgaddr[frontidx], pixels, pgsize >> 3);
277 static void blit_frame_banked(void *pixels, int vsync)
280 unsigned int pending;
281 unsigned char *pptr = pixels;
283 if(vsync) wait_vsync();
285 /* assume initial window offset at 0 */
289 sz = pending > curmode->bank_size ? curmode->bank_size : pending;
290 //memcpy64((void*)0xa0000, pptr, sz >> 3);
291 memcpy((void*)0xa0000, pptr, sz);
294 vbe_setwin(0, ++offs);
300 static uint32_t calc_mask(int sz, int pos)
304 mask = (mask << 1) | 1;