--- /dev/null
+#include <string.h>
+#include <conio.h>
+#include <i86.h>
+#include "vidsys.h"
+#include "drv.h"
+#include "vbe.h"
+#include "vga.h"
+#include "cdpmi.h"
+
+#define farptr_to_linear(rmaddr) \
+ ((((intptr_t)(rmaddr) >> 12) & 0xffff0) + ((intptr_t)(rmaddr) & 0xffff))
+
+static int init(void);
+static void cleanup(void);
+static struct vid_modeinfo *find_mode(int mode);
+static int setmode(int mode);
+static int getmode(void);
+static const char *memsize_str(long sz);
+static int get_mode_info(int mode, struct vbe_mode_info *mi);
+static int conv_vbeinfo(int mode, struct vid_modeinfo *mi, struct vbe_mode_info *vbemi);
+static unsigned int calc_mask(int nbits, int pos);
+
+static void pack(uint32_t *pix, int r, int g, int b);
+static void unpack(uint32_t pix, int *r, int *g, int *b);
+static void clear(uint32_t color);
+static void blitfb_lfb(void *fb, int pitch);
+static void blitfb_banked(void *fb, int pitch);
+static void flip(int vsync);
+
+static struct vid_driver drv;
+static struct vid_drvops drvops = {init, cleanup, setmode, getmode};
+static unsigned int vbe_ver;
+
+static int cur_mode;
+static struct vid_modeinfo *cur_mi;
+static int cur_pgsize;
+
+
+void vid_register_vbe(void)
+{
+ drv.name = "vbe";
+ drv.prio = 2;
+ drv.ops = &drvops;
+
+ vid_drvlist[vid_numdrv++] = &drv;
+}
+
+
+static int init(void)
+{
+ struct dpmi_regs regs = {0};
+ struct vbe_info *vbe;
+ struct vbe_mode_info vbemi;
+ unsigned short bufseg;
+ uint16_t *vbe_modelist, *modelist;
+ int i, count;
+ struct vid_modeinfo modeinf;
+
+ cur_mode = -1;
+ cur_mi = 0;
+
+ vbe = dpmi_lowbuf();
+ bufseg = (intptr_t)vbe >> 4;
+
+ /* call VBE function 00 (get controller information) */
+ memcpy(vbe->sig, "VBE2", 4); /* denote we want VBE 2.0 info */
+ regs.eax = 0x4f00;
+ regs.es = bufseg;
+ dpmi_rmint(0x10, ®s);
+ if((regs.eax & 0xffff) != 0x4f || memcmp(vbe->sig, "VESA", 4) != 0) {
+ fprintf(stderr, "failed to get VBE controller information\n");
+ return -1;
+ }
+
+ vbe_ver = vbe->ver;
+
+ printf("Found VBE %d.%d\n", VBE_VER_MAJOR(vbe_ver), VBE_VER_MINOR(vbe_ver));
+ printf("OEM: %s\n", (char*)farptr_to_linear(vbe->oem_name));
+ if(vbe_ver >= 0x0200) {
+ printf("%s - %s (%s)\n", (char*)farptr_to_linear(vbe->vendor),
+ (char*)farptr_to_linear(vbe->product),
+ (char*)farptr_to_linear(vbe->revstr));
+ }
+ printf("Video RAM: %s\n", memsize_str((long)vbe->vmem_blk * 65536));
+
+ vbe_modelist = (uint16_t*)farptr_to_linear(vbe->modelist_addr);
+ count = 0;
+ for(i=0; i<1024; i++) {
+ if(vbe_modelist[i] == 0xffff) break;
+ count++;
+ }
+
+ if(!(modelist = malloc(count * sizeof *modelist))) {
+ fprintf(stderr, "failed to allocate mode list\n");
+ return -1;
+ }
+ for(i=0; i<count; i++) {
+ modelist[i] = vbe_modelist[i];
+ }
+
+ if(!(drv.modes = malloc(count * sizeof *drv.modes))) {
+ fprintf(stderr, "failed to allocate mode list\n");
+ free(modelist);
+ return -1;
+ }
+
+ drv.num_modes = 0;
+ for(i=0; i<count; i++) {
+ if(get_mode_info(modelist[i], &vbemi) == -1) {
+ continue;
+ }
+ if(conv_vbeinfo(modelist[i], drv.modes + drv.num_modes, &vbemi) == -1) {
+ continue;
+ }
+ drv.num_modes++;
+ }
+
+ free(modelist);
+ return 0;
+}
+
+static void cleanup(void)
+{
+ free(drv.modes);
+ drv.modes = 0;
+ drv.num_modes = 0;
+}
+
+static struct vid_modeinfo *find_mode(int mode)
+{
+ int i;
+ for(i=0; i<drv.num_modes; i++) {
+ if(drv.modes[i].modeno == mode) {
+ return drv.modes + i;
+ }
+ }
+ return 0;
+}
+
+static int setmode(int mode)
+{
+ struct vid_modeinfo *minf;
+ struct dpmi_regs regs = {0};
+
+ if((minf = find_mode(mode)) && minf->lfb) {
+ mode |= VBE_MODE_LFB;
+ }
+
+retry:
+ regs.eax = 0x4f02;
+ regs.ebx = mode;
+ dpmi_rmint(0x10, ®s);
+
+ if((regs.eax & 0xffff) != 0x4f) {
+ if(mode & VBE_MODE_LFB) {
+ mode &= ~VBE_MODE_LFB;
+ goto retry;
+ }
+ return -1;
+ }
+ cur_mode = mode;
+
+ if(!(cur_mi = minf)) return 0;
+
+ cur_pgsize = minf->height * minf->pitch;
+
+ if(mode & VBE_MODE_LFB) {
+ minf->ops.blitfb = blitfb_lfb;
+ } else {
+ minf->ops.blitfb = blitfb_banked;
+ }
+ return 0;
+}
+
+static int getmode(void)
+{
+ return cur_mode;
+}
+
+static const char *memsize_str(long sz)
+{
+ static const char *suffix[] = {"bytes", "kb", "mb", "gb", 0};
+ static int cnt = 0;
+ static char buf[64];
+
+ while(sz > 1024 && suffix[cnt + 1]) {
+ sz >>= 10;
+ cnt++;
+ }
+
+ sprintf(buf, "%ld %s", sz, suffix[cnt]);
+ return buf;
+}
+
+static int get_mode_info(int mode, struct vbe_mode_info *mi)
+{
+ struct dpmi_regs regs = {0};
+ struct vbe_mode_info *miptr;
+ uint16_t bufseg;
+
+ miptr = dpmi_lowbuf();
+ bufseg = (intptr_t)miptr >> 4;
+
+ regs.eax = 0x4f01;
+ regs.ecx = mode;
+ regs.es = bufseg;
+ dpmi_rmint(0x10, ®s);
+ if((regs.eax & 0xffff) != 0x4f) {
+ return -1;
+ }
+
+ *mi = *miptr;
+ return 0;
+}
+
+int vid_setwin(int wid, int pos)
+{
+ struct dpmi_regs regs = {0};
+
+ regs.eax = 0x4f05;
+ regs.ebx = wid;
+ regs.edx = pos;
+ dpmi_rmint(0x10, ®s);
+ if((regs.eax & 0xffff) != 0x4f) {
+ return -1;
+ }
+ return 0;
+}
+
+static int conv_vbeinfo(int mode, struct vid_modeinfo *mi, struct vbe_mode_info *vbemi)
+{
+ static int gran_shift;
+ static const struct { int width, height, bpp; } stdmode[] = {
+ {640, 400, 8}, /* 100h */
+ {640, 480, 8}, /* 101h */
+ {800, 600, 4}, {800, 600, 8}, /* 102h - 103h */
+ {1024, 768, 4}, {1024, 768, 8}, /* 104h - 105h */
+ {1280, 1024, 4}, {1280, 1024, 8}, /* 106h - 107h */
+ {80, 60, 4}, {132, 25, 4}, {132, 43, 4}, {132, 50, 4}, {132, 60, 4},
+ {320, 200, 15}, {320, 200, 16}, {320, 200, 24}, /* 10dh - 10fh */
+ {640, 480, 15}, {640, 480, 16}, {640, 480, 24}, /* 110h - 112h */
+ {800, 600, 15}, {800, 600, 16}, {800, 600, 24}, /* 113h - 115h */
+ {1024, 768, 15}, {1024, 768, 16}, {1024, 768, 24}, /* 116h - 118h */
+ {1280, 1024, 15}, {1280, 1024, 16}, {1280, 1024, 24} /* 119h - 11bh */
+ };
+
+ if(!(vbemi->attr & VBE_ATTR_AVAIL)) {
+ return -1; /* ignore unsupported modes */
+ }
+ if(!(vbemi->attr & VBE_ATTR_GFX)) {
+ return -1; /* ignore text modes */
+ }
+ if(vbemi->attr & VBE_ATTR_LFB) {
+ mi->lfb = 1;
+ }
+
+ mi->drv = &drv;
+ mi->modeno = mode;
+ mi->vmem_addr = 0xa0000;
+
+ if(vbe_ver >= 0x0102) {
+ mi->width = vbemi->xres;
+ mi->height = vbemi->yres;
+ mi->bpp = vbemi->bpp;
+ mi->rshift = vbemi->rpos;
+ mi->gshift = vbemi->gpos;
+ mi->bshift = vbemi->bpos;
+ mi->rmask = calc_mask(vbemi->rsize, vbemi->rpos);
+ mi->gmask = calc_mask(vbemi->gsize, vbemi->gpos);
+ mi->bmask = calc_mask(vbemi->bsize, vbemi->bpos);
+ mi->pages = vbemi->num_img_pages + 1;
+
+ if(vbe_ver >= 0x0200) {
+ mi->vmem_addr = vbemi->fb_addr;
+ mi->vmem_size = vbemi->scanline_bytes * mi->height * mi->pages;
+ }
+ } else {
+ if((mode & 0xff) > 7) {
+ return -1;
+ }
+ mi->width = stdmode[mode & 0xff].width;
+ mi->height = stdmode[mode & 0xff].height;
+ mi->bpp = stdmode[mode & 0xff].bpp;
+ }
+ mi->ncolors = 1 << mi->bpp;
+ mi->pitch = vbemi->scanline_bytes;
+ mi->win_size = vbemi->win_size;
+ mi->win_gran = vbemi->win_gran;
+
+ gran_shift = 0;
+ mi->win_step = 1;
+ if(mi->win_gran > 0 && mi->win_gran < 64) {
+ int gran = mi->win_gran;
+ while(gran < 64) {
+ gran_shift++;
+ gran <<= 1;
+ }
+ mi->win_step = 1 << gran_shift;
+ }
+
+ mi->ops.pack = pack;
+ mi->ops.unpack = unpack;
+ mi->ops.setpal = vga_setpal;
+ mi->ops.getpal = vga_getpal;
+ mi->ops.vsync = vid_vsync;
+ mi->ops.clear = clear;
+ mi->ops.blitfb = 0;
+ mi->ops.flip = flip;
+ return 0;
+}
+
+static unsigned int calc_mask(int nbits, int pos)
+{
+ int i;
+ unsigned int mask = 0;
+
+ for(i=0; i<nbits; i++) {
+ mask = (mask << 1) | 1;
+ }
+ return mask << pos;
+}
+
+
+static void pack(uint32_t *pix, int r, int g, int b)
+{
+ *pix = (((uint32_t)r << cur_mi->rshift) & cur_mi->rmask) |
+ (((uint32_t)g << cur_mi->gshift) & cur_mi->gmask) |
+ (((uint32_t)b << cur_mi->bshift) & cur_mi->bmask);
+}
+
+static void unpack(uint32_t pix, int *r, int *g, int *b)
+{
+ *r = (pix & cur_mi->rmask) >> cur_mi->rshift;
+ *g = (pix & cur_mi->gmask) >> cur_mi->gshift;
+ *b = (pix & cur_mi->bmask) >> cur_mi->bshift;
+}
+
+static void clear(uint32_t color)
+{
+}
+
+static void blitfb_lfb(void *fb, int pitch)
+{
+ int i;
+ unsigned char *dest, *src;
+
+ dest = vid_vmem;
+ src = fb;
+
+ for(i=0; i<cur_mi->height; i++) {
+ memcpy(dest, src, cur_mi->pitch);
+ dest += cur_mi->pitch;
+ src += pitch;
+ }
+}
+
+static void blitfb_banked(void *fb, int pitch)
+{
+ int sz, offs, pending;
+ unsigned char *pptr = fb;
+
+ /* assume initial window offset at 0 */
+ offs = 0;
+ pending = cur_pgsize;
+ while(pending > 0) {
+ sz = pending > 65536 ? 65536 : pending;
+ memcpy((void*)0xa0000, pptr, sz);
+ pptr += sz;
+ pending -= sz;
+ offs += cur_mi->win_step;
+ vid_setwin(0, offs);
+ }
+ vid_setwin(0, 0);
+}
+
+static void flip(int vsync)
+{
+ /* TODO */
+}
projects / retroray / blobdiff