-#ifndef GFX_H_
-#define GFX_H_
-
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <limits.h>
+#include <dos.h>
+#include "demo.h"
+#include "cdpmi.h"
+#include "gfx.h"
#include "vbe.h"
-#include "dpmi.h"
+#include "vga.h"
+#include "util.h"
+#include "cpuid.h"
-#define REALPTR(s, o) (void*)(((uint32_t)(s) << 4) + (uint32_t)(o))
-#define VBEPTR(x) REALPTR(((x) & 0xffff0000) >> 16, (x) & 0xffff)
-#define VBEPTR_SEG(x) (((x) & 0xffff0000) >> 16)
-#define VBEPTR_OFF(x) ((x) & 0xffff)
+#ifdef __DJGPP__
+#define VMEM_PTR ((void*)(0xa0000 + __djgpp_conventional_base))
+#else
+#define VMEM_PTR ((void*)0xa0000)
+#endif
#define SAME_BPP(a, b) \
- ((a) == (b) || (a) == 16 && (b) == 15 || (a) == 15 && (b) == 16 || (a) == 32 && (b) == 24 || (a) == 24 && (b) == 32)
+ ((a) == (b) || ((a) == 16 && (b) == 15) || ((a) == 15 && (b) == 16) || \
+ ((a) == 32 && (b) == 24) || ((a) == 24 && (b) == 32))
+
+void (*blit_frame)(void*, int);
+
+static void blit_frame_lfb(void *pixels, int vsync);
+static void blit_frame_banked(void *pixels, int vsync);
+static uint32_t calc_mask(int sz, int pos);
+
+static void enable_wrcomb(uint32_t addr, int len);
+static const char *mtrr_type_name(int type);
+static void print_mtrr(void);
+
+static struct video_mode *vmodes;
+static int num_vmodes;
-static unsigned int make_mask(int sz, int pos);
+static int vbe_init_ver;
+static struct vbe_info vbe;
-static struct vbe_info *vbe_info;
-static struct vbe_mode_info *mode_info;
-static int pal_bits = 6;
+/* current mode */
+static struct video_mode *curmode;
+static void *vpgaddr[2];
+static int frontidx, backidx;
+static int pgcount, pgsize, fbsize;
-void *set_video_mode(int xsz, int ysz, int bpp)
+
+int init_video(void)
{
- int i;
- uint16_t *modes, best = 0;
- unsigned int fbsize;
+ int i, num, max_modes;
+ struct video_mode *vmptr;
- /* check for VBE2 support and output some info */
- if(!vbe_info) {
- if(!(vbe_info = vbe_get_info())) {
- fprintf(stderr, "VESA BIOS Extensions not available\n");
- return 0;
+ if(vbe_info(&vbe) == -1) {
+ fprintf(stderr, "failed to retrieve VBE information\n");
+ return -1;
+ }
+ vbe_print_info(stdout, &vbe);
+
+ num_vmodes = 0;
+ max_modes = 64;
+ if(!(vmodes = malloc(max_modes * sizeof *vmodes))) {
+ fprintf(stderr, "failed to allocate video modes list\n");
+ return -1;
+ }
+
+ num = vbe_num_modes(&vbe);
+ for(i=0; i<num; i++) {
+ struct vbe_mode_info minf;
+
+ if(vbe_mode_info(vbe.modes[i], &minf) == -1) {
+ continue;
+ }
+
+ if(num_vmodes >= max_modes) {
+ int newmax = max_modes ? (max_modes << 1) : 16;
+ if(!(vmptr = realloc(vmodes, newmax * sizeof *vmodes))) {
+ fprintf(stderr, "failed to grow video mode list (%d)\n", newmax);
+ free(vmodes);
+ return -1;
+ }
+ vmodes = vmptr;
+ max_modes = newmax;
+ }
+
+ vmptr = vmodes + num_vmodes++;
+ memset(vmptr, 0, sizeof *vmptr);
+ vmptr->mode = vbe.modes[i];
+ vmptr->xsz = minf.xres;
+ vmptr->ysz = minf.yres;
+ vmptr->bpp = minf.bpp;
+ vmptr->pitch = minf.scanline_bytes;
+ if(minf.mem_model == VBE_TYPE_DIRECT) {
+ vmptr->rbits = minf.rsize;
+ vmptr->gbits = minf.gsize;
+ vmptr->bbits = minf.bsize;
+ vmptr->rshift = minf.rpos;
+ vmptr->gshift = minf.gpos;
+ vmptr->bshift = minf.bpos;
+ vmptr->rmask = calc_mask(minf.rsize, minf.rpos);
+ vmptr->gmask = calc_mask(minf.gsize, minf.gpos);
+ vmptr->bmask = calc_mask(minf.bsize, minf.bpos);
+ /*vmptr->bpp = vmptr->rbits + vmptr->gbits + vmptr->bbits;*/
+ }
+ if(minf.attr & VBE_ATTR_LFB) {
+ vmptr->fb_addr = minf.fb_addr;
+ }
+ vmptr->max_pages = minf.num_img_pages;
+ vmptr->win_gran = minf.win_gran;
+
+ printf("%04x: ", vbe.modes[i]);
+ vbe_print_mode_info(stdout, &minf);
+ }
+ fflush(stdout);
+
+ vbe_init_ver = VBE_VER_MAJOR(vbe.ver);
+ return 0;
+}
+
+void cleanup_video(void)
+{
+ free(vmodes);
+}
+
+struct video_mode *video_modes(void)
+{
+ return vmodes;
+}
+
+int num_video_modes(void)
+{
+ return num_vmodes;
+}
+
+struct video_mode *get_video_mode(int idx)
+{
+ if(idx == VMODE_CURRENT) {
+ return curmode;
+ }
+ return vmodes + idx;
+}
+
+int match_video_mode(int xsz, int ysz, int bpp)
+{
+ int i, best = -1;
+ struct video_mode *vm;
+
+ for(i=0; i<num_vmodes; i++) {
+ vm = vmodes + i;
+ if(vm->xsz != xsz || vm->ysz != ysz) continue;
+ if(SAME_BPP(vm->bpp, bpp)) {
+ best = i;
}
+ if(vm->bpp == bpp) break;
+ }
+
+ if(best == -1) {
+ fprintf(stderr, "failed to find video mode %dx%d %d bpp)\n", xsz, ysz, bpp);
+ return -1;
+ }
+ return best;
+}
+
+int find_video_mode(int mode)
+{
+ int i;
+ struct video_mode *vm;
- printf("VBE Version: %x.%x\n", vbe_info->version >> 8, vbe_info->version & 0xff);
- if(vbe_info->version < 0x200) {
- fprintf(stderr, "This program requires VBE 2.0 or greater. Try running UniVBE\n");
+ vm = vmodes;
+ for(i=0; i<num_vmodes; i++) {
+ if(vm->mode == mode) return i;
+ }
+ return -1;
+}
+
+void *set_video_mode(int idx, int nbuf)
+{
+ unsigned int mode;
+ struct video_mode *vm = vmodes + idx;
+
+ if(curmode == vm) return vpgaddr[0];
+
+ printf("setting video mode %x (%dx%d %d bpp)\n", (unsigned int)vm->mode,
+ vm->xsz, vm->ysz, vm->bpp);
+ fflush(stdout);
+
+ mode = vm->mode | VBE_MODE_LFB;
+ if(vbe_setmode(mode) == -1) {
+ mode = vm->mode;
+ if(vbe_setmode(mode) == -1) {
+ fprintf(stderr, "failed to set video mode %x\n", (unsigned int)vm->mode);
return 0;
}
+ printf("Warning: failed to get a linear framebuffer. falling back to banked mode\n");
+ }
- printf("Graphics adapter: %s, %s (%s)\n", VBEPTR(vbe_info->oem_vendor_name_ptr),
- VBEPTR(vbe_info->oem_product_name_ptr), VBEPTR(vbe_info->oem_product_rev_ptr));
- printf("Video memory: %dkb\n", vbe_info->total_mem << 6);
+ /* unmap previous video memory mapping, if there was one (switching modes) */
+ if(vpgaddr[0] && vpgaddr[0] != VMEM_PTR) {
+ dpmi_munmap(vpgaddr[0]);
+ vpgaddr[0] = vpgaddr[1] = 0;
+ }
- modes = VBEPTR(vbe_info->vid_mode_ptr);
+ curmode = vm;
+ if(nbuf < 1) nbuf = 1;
+ if(nbuf > 2) nbuf = 2;
+ pgcount = nbuf > vm->max_pages + 1 ? vm->max_pages + 1 : nbuf;
+ pgsize = vm->ysz * vm->pitch;
+ fbsize = pgcount * pgsize;
+
+ if(vm->bpp > 8) {
+ printf("rgb mask: %x %x %x\n", (unsigned int)vm->rmask,
+ (unsigned int)vm->gmask, (unsigned int)vm->bmask);
+ printf("rgb shift: %d %d %d\n", vm->rshift, vm->gshift, vm->bshift);
+ }
+ printf("pgcount: %d, pgsize: %d, fbsize: %d\n", pgcount, pgsize, fbsize);
+ if(vm->fb_addr) {
+ printf("phys addr: %p\n", (void*)vm->fb_addr);
}
+ fflush(stdout);
- for(i=0; i<1024; i++) { /* impose an upper limit to avoid inf-loops */
- if(modes[i] == 0xffff) {
- break; /* reached the end */
+ if(vm->fb_addr) {
+ vpgaddr[0] = (void*)dpmi_mmap(vm->fb_addr, fbsize);
+ if(!vpgaddr[0]) {
+ fprintf(stderr, "failed to map framebuffer (phys: %lx, size: %d)\n",
+ (unsigned long)vm->fb_addr, fbsize);
+ set_text_mode();
+ return 0;
}
+ memset(vpgaddr[0], 0xaa, pgsize);
- mode_info = vbe_get_mode_info(modes[i] | VBE_MODE_LFB);
- if(!mode_info || mode_info->xres != xsz || mode_info->yres != ysz) {
- continue;
+ if(pgcount > 1) {
+ vpgaddr[1] = (char*)vpgaddr[0] + pgsize;
+ backidx = 1;
+ page_flip(FLIP_NOW); /* start with the second page visible */
+ } else {
+ frontidx = backidx = 0;
+ vpgaddr[1] = 0;
}
- if(SAME_BPP(mode_info->bpp, bpp)) {
- best = modes[i];
+
+ blit_frame = blit_frame_lfb;
+
+ /* only attempt to set up write combining if the CPU we're running on
+ * supports memory type range registers, and we're running on ring 0
+ */
+ if(CPU_HAVE_MTRR) {
+ int cpl = get_cpl();
+ if(cpl > 0) {
+ fprintf(stderr, "Can't set framebuffer range to write-combining, running in ring %d\n", cpl);
+ } else {
+ uint32_t len = (uint32_t)vbe.vmem_blk << 16;
+
+ /* if vmem_blk is 0 or if the reported size is absurd (more than
+ * 256mb), just use the framebuffer size for this mode to setup the
+ * mtrr
+ */
+ if(!len || len > 0x10000000) {
+ printf("reported vmem too large or overflowed, using fbsize for wrcomb setup\n");
+ len = fbsize;
+ }
+ print_mtrr();
+ enable_wrcomb(vm->fb_addr, len);
+ }
}
- }
- if(best) {
- mode_info = vbe_get_mode_info(best);
} else {
- fprintf(stderr, "Requested video mode (%dx%d %dbpp) is unavailable\n", xsz, ysz, bpp);
- return 0;
- }
+ vpgaddr[0] = VMEM_PTR;
+ vpgaddr[1] = 0;
- if(vbe_set_mode(best | VBE_MODE_LFB) == -1) {
- fprintf(stderr, "Failed to set video mode %dx%d %dbpp\n", mode_info->xres, mode_info->yres, mode_info->bpp);
- return 0;
+ blit_frame = blit_frame_banked;
+
+ /* calculate window granularity shift */
+ vm->win_gran_shift = 0;
+ vm->win_64k_step = 1;
+ if(vm->win_gran > 0 && vm->win_gran < 64) {
+ int gran = vm->win_gran;
+ while(gran < 64) {
+ vm->win_gran_shift++;
+ gran <<= 1;
+ }
+ vm->win_64k_step = 1 << vm->win_gran_shift;
+ }
+
+ printf("granularity: %dk (step: %d)\n", vm->win_gran, vm->win_64k_step);
}
- /* attempt to set 8 bits of color per component in palettized modes */
- /*if(bpp <= 8) {
- pal_bits = vbe_set_palette_bits(8);
- printf("palette bits per color primary: %d\n", pal_bits);
+ /* allocate main memory framebuffer */
+ if(demo_resizefb(vm->xsz, vm->ysz, vm->bpp) == -1) {
+ fprintf(stderr, "failed to allocate %dx%d (%d bpp) framebuffer\n", vm->xsz,
+ vm->ysz, vm->bpp);
+ set_text_mode();
+ return 0;
}
- */
- fbsize = xsz * ysz * mode_info->num_img_pages * (bpp / CHAR_BIT);
- return (void*)dpmi_mmap(mode_info->fb_addr, fbsize);
+ fflush(stdout);
+ return vpgaddr[0];
}
int set_text_mode(void)
{
- vbe_set_mode(0x3);
+ /* unmap previous video memory mapping, if there was one (switching modes) */
+ if(vpgaddr[0] && vpgaddr[0] != VMEM_PTR) {
+ dpmi_munmap(vpgaddr[0]);
+ vpgaddr[0] = vpgaddr[1] = 0;
+ }
+
+ vga_setmode(3);
+ curmode = 0;
return 0;
}
-int get_color_depth(void)
+void *page_flip(int vsync)
{
- if(!mode_info) {
- return -1;
+ if(!vpgaddr[1]) {
+ /* page flipping not supported */
+ return vpgaddr[0];
}
- return mode_info->bpp;
+
+ vbe_swap(backidx ? pgsize : 0, vsync ? VBE_SWAP_VBLANK : VBE_SWAP_NOW);
+ frontidx = backidx;
+ backidx = (backidx + 1) & 1;
+
+ return vpgaddr[backidx];
}
-int get_color_bits(int *rbits, int *gbits, int *bbits)
+
+static void blit_frame_lfb(void *pixels, int vsync)
{
- if(!mode_info) {
- return -1;
+ demo_post_draw(pixels);
+
+ if(vsync) wait_vsync();
+ memcpy64(vpgaddr[frontidx], pixels, pgsize >> 3);
+}
+
+static void blit_frame_banked(void *pixels, int vsync)
+{
+ int sz, offs, pending;
+ unsigned char *pptr = pixels;
+
+ demo_post_draw(pixels);
+
+ if(vsync) wait_vsync();
+
+ /* assume initial window offset at 0 */
+ offs = 0;
+ pending = pgsize;
+ while(pending > 0) {
+ sz = pending > 65536 ? 65536 : pending;
+ /*memcpy64(VMEM_PTR, pptr, sz >> 3);*/
+ memcpy(VMEM_PTR, pptr, sz);
+ pptr += sz;
+ pending -= sz;
+ offs += curmode->win_64k_step;
+ vbe_setwin(0, offs);
}
- *rbits = mode_info->rmask_size;
- *gbits = mode_info->gmask_size;
- *bbits = mode_info->bmask_size;
- return 0;
+ vbe_setwin(0, 0);
}
-int get_color_mask(unsigned int *rmask, unsigned int *gmask, unsigned int *bmask)
+static uint32_t calc_mask(int sz, int pos)
{
- if(!mode_info) {
- return -1;
+ uint32_t mask = 0;
+ while(sz-- > 0) {
+ mask = (mask << 1) | 1;
}
- *rmask = make_mask(mode_info->rmask_size, mode_info->rpos);
- *gmask = make_mask(mode_info->gmask_size, mode_info->gpos);
- *bmask = make_mask(mode_info->bmask_size, mode_info->bpos);
- return 0;
+ return mask << pos;
}
-int get_color_shift(int *rshift, int *gshift, int *bshift)
+#define MSR_MTRRCAP 0xfe
+#define MSR_MTRRDEFTYPE 0x2ff
+#define MSR_MTRRBASE(x) (0x200 | ((x) << 1))
+#define MSR_MTRRMASK(x) (0x201 | ((x) << 1))
+#define MTRRDEF_EN 0x800
+#define MTRRCAP_HAVE_WC 0x400
+#define MTRRMASK_VALID 0x800
+
+#define MTRR_WC 1
+
+static int get_page_memtype(uint32_t addr, int num_ranges)
{
- if(!mode_info) {
- return -1;
+ int i;
+ uint32_t rlow, rhigh;
+ uint32_t base, mask;
+
+ for(i=0; i<num_ranges; i++) {
+ get_msr(MSR_MTRRMASK(i), &rlow, &rhigh);
+ if(!(rlow & MTRRMASK_VALID)) {
+ continue;
+ }
+ mask = rlow & 0xfffff000;
+
+ get_msr(MSR_MTRRBASE(i), &rlow, &rhigh);
+ base = rlow & 0xfffff000;
+
+ if((addr & mask) == (base & mask)) {
+ return rlow & 0xff;
+ }
}
- *rshift = mode_info->rpos;
- *gshift = mode_info->gpos;
- *bshift = mode_info->bpos;
- return 0;
+
+ get_msr(MSR_MTRRDEFTYPE, &rlow, &rhigh);
+ return rlow & 0xff;
}
-void set_palette(int idx, int r, int g, int b)
+static int check_wrcomb_enabled(uint32_t addr, int len, int num_ranges)
{
- int col[3];
- col[0] = r;
- col[1] = g;
- col[2] = b;
- vbe_set_palette(idx, col, 1, pal_bits);
+ while(len > 0) {
+ if(get_page_memtype(addr, num_ranges) != MTRR_WC) {
+ return 0;
+ }
+ addr += 4096;
+ len -= 4096;
+ }
+ return 1;
}
-void wait_vsync(void)
+static int alloc_mtrr(int num_ranges)
{
- __asm {
- mov dx, 0x3da
- l1:
- in al, dx
- and al, 0x8
- jnz l1
- l2:
- in al, dx
- and al, 0x8
- jz l2
+ int i;
+ uint32_t rlow, rhigh;
+
+ for(i=0; i<num_ranges; i++) {
+ get_msr(MSR_MTRRMASK(i), &rlow, &rhigh);
+ if(!(rlow & MTRRMASK_VALID)) {
+ return i;
+ }
}
+ return -1;
}
-static unsigned int make_mask(int sz, int pos)
+static void enable_wrcomb(uint32_t addr, int len)
{
- unsigned int i, mask = 0;
+ int num_ranges, mtrr;
+ uint32_t rlow, rhigh;
+ uint32_t def, mask;
- for(i=0; i<sz; i++) {
- mask |= 1 << i;
+ if(len <= 0 || (addr | (uint32_t)len) & 0xfff) {
+ fprintf(stderr, "failed to enable write combining, unaligned range: %p/%x\n",
+ (void*)addr, (unsigned int)len);
+ return;
}
- return mask << pos;
+
+ get_msr(MSR_MTRRCAP, &rlow, &rhigh);
+ num_ranges = rlow & 0xff;
+
+ printf("enable_wrcomb: addr=%p len=%x\n", (void*)addr, (unsigned int)len);
+
+ if(!(rlow & MTRRCAP_HAVE_WC)) {
+ fprintf(stderr, "failed to enable write combining, processor doesn't support it\n");
+ return;
+ }
+
+ if(check_wrcomb_enabled(addr, len, num_ranges)) {
+ return;
+ }
+
+ if((mtrr = alloc_mtrr(num_ranges)) == -1) {
+ fprintf(stderr, "failed to enable write combining, no free MTRRs\n");
+ return;
+ }
+
+ mask = len - 1;
+ mask |= mask >> 1;
+ mask |= mask >> 2;
+ mask |= mask >> 4;
+ mask |= mask >> 8;
+ mask |= mask >> 16;
+ mask = ~mask & 0xfffff000;
+
+ printf(" ... mask: %08x\n", (unsigned int)mask);
+
+ _disable();
+ get_msr(MSR_MTRRDEFTYPE, &def, &rhigh);
+ set_msr(MSR_MTRRDEFTYPE, def & ~MTRRDEF_EN, rhigh);
+
+ set_msr(MSR_MTRRBASE(mtrr), addr | MTRR_WC, 0);
+ set_msr(MSR_MTRRMASK(mtrr), mask | MTRRMASK_VALID, 0);
+
+ set_msr(MSR_MTRRDEFTYPE, def | MTRRDEF_EN, 0);
+ _enable();
}
+static const char *mtrr_names[] = { "N/A", "W C", "N/A", "N/A", "W T", "W P", "W B" };
-#endif /* GFX_H_ */
+static const char *mtrr_type_name(int type)
+{
+ if(type < 0 || type >= sizeof mtrr_names / sizeof *mtrr_names) {
+ return mtrr_names[0];
+ }
+ return mtrr_names[type];
+}
+
+static void print_mtrr(void)
+{
+ int i, num_ranges;
+ uint32_t rlow, rhigh, base, mask;
+
+ get_msr(MSR_MTRRCAP, &rlow, &rhigh);
+ num_ranges = rlow & 0xff;
+
+ for(i=0; i<num_ranges; i++) {
+ get_msr(MSR_MTRRBASE(i), &base, &rhigh);
+ get_msr(MSR_MTRRMASK(i), &mask, &rhigh);
+
+ if(mask & MTRRMASK_VALID) {
+ printf("mtrr%d: base %p, mask %08x type %s\n", i, (void*)(base & 0xfffff000),
+ (unsigned int)(mask & 0xfffff000), mtrr_type_name(base & 0xff));
+ } else {
+ printf("mtrr%d unused (%08x/%08x)\n", i, (unsigned int)base,
+ (unsigned int)mask);
+ }
+ }
+ fflush(stdout);
+}
projects / dosdemo / blobdiff