/* vid_ext.c @description@ Copyright (C) 1996-1997 Id Software, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to: Free Software Foundation, Inc. 59 Temple Place - Suite 330 Boston, MA 02111-1307, USA $Id$ */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include "d_local.h" #include "dosisms.h" #include "vid_dos.h" #include #define MODE_SUPPORTED_IN_HW 0x0001 #define COLOR_MODE 0x0008 #define GRAPHICS_MODE 0x0010 #define VGA_INCOMPATIBLE 0x0020 #define LINEAR_FRAME_BUFFER 0x0080 #define LINEAR_MODE 0x4000 #define VESA_DONT_WAIT_VSYNC 0 // when page flipping #define VESA_WAIT_VSYNC 0x80 #define MAX_VESA_MODES 30 // we'll just take the first 30 if there // are more typedef struct { int pages[3]; // either 2 or 3 is valid int vesamode; // LINEAR_MODE set if linear mode void *plinearmem; // linear address of start of frame buffer qboolean vga_incompatible; } vesa_extra_t; static vmode_t vesa_modes[MAX_VESA_MODES] = {{NULL, NULL, " ********* VESA modes ********* "}}; static vesa_extra_t vesa_extra[MAX_VESA_MODES]; static char names[MAX_VESA_MODES][10]; extern regs_t regs; static int VID_currentpage; static int VID_displayedpage; static int *VID_pagelist; static byte *VID_membase; static int VID_banked; typedef struct { int modenum; int mode_attributes; int winasegment; int winbsegment; int bytes_per_scanline; // bytes per logical scanline (+16) int win; // window number (A=0, B=1) int win_size; // window size (+6) int granularity; // how finely i can set the window in vid mem (+4) int width, height; // displayed width and height (+18, +20) int bits_per_pixel; // er, better be 8, 15, 16, 24, or 32 (+25) int bytes_per_pixel; // er, better be 1, 2, or 4 int memory_model; // and better be 4 or 6, packed or direct color (+27) int num_pages; // number of complete frame buffer pages (+29) int red_width; // the # of bits in the red component (+31) int red_pos; // the bit position of the red component (+32) int green_width; // etc.. (+33) int green_pos; // (+34) int blue_width; // (+35) int blue_pos; // (+36) int pptr; int pagesize; int numpages; } modeinfo_t; static modeinfo_t modeinfo; // all bytes to avoid problems with compiler field packing typedef struct vbeinfoblock_s { byte VbeSignature[4]; byte VbeVersion[2]; byte OemStringPtr[4]; byte Capabilities[4]; byte VideoModePtr[4]; byte TotalMemory[2]; byte OemSoftwareRev[2]; byte OemVendorNamePtr[4]; byte OemProductNamePtr[4]; byte OemProductRevPtr[4]; byte Reserved[222]; byte OemData[256]; } vbeinfoblock_t; static int totalvidmem; static byte *ppal; qboolean vsync_exists, de_exists; qboolean VID_ExtraGetModeInfo(int modenum); int VID_ExtraInitMode (viddef_t *vid, vmode_t *pcurrentmode); void VID_ExtraSwapBuffers (viddef_t *vid, vmode_t *pcurrentmode, vrect_t *rects); /* ================ VGA_BankedBeginDirectRect ================ */ void VGA_BankedBeginDirectRect (viddef_t *lvid, struct vmode_s *pcurrentmode, int x, int y, byte *pbitmap, int width, int height) { if (!lvid->direct) return; regs.x.ax = 0x4f05; regs.x.bx = 0; regs.x.dx = VID_displayedpage; dos_int86(0x10); VGA_BeginDirectRect (lvid, pcurrentmode, x, y, pbitmap, width, height); regs.x.ax = 0x4f05; regs.x.bx = 0; regs.x.dx = VID_currentpage; dos_int86(0x10); } /* ================ VGA_BankedEndDirectRect ================ */ void VGA_BankedEndDirectRect (viddef_t *lvid, struct vmode_s *pcurrentmode, int x, int y, int width, int height) { if (!lvid->direct) return; regs.x.ax = 0x4f05; regs.x.bx = 0; regs.x.dx = VID_displayedpage; dos_int86(0x10); VGA_EndDirectRect (lvid, pcurrentmode, x, y, width, height); regs.x.ax = 0x4f05; regs.x.bx = 0; regs.x.dx = VID_currentpage; dos_int86(0x10); } /* ================ VID_SetVESAPalette ================ */ void VID_SetVESAPalette (viddef_t *lvid, vmode_t *pcurrentmode, unsigned char *pal) { int i; byte *pp; UNUSED(lvid); UNUSED(pcurrentmode); pp = ppal; for (i=0 ; i<256 ; i++) { pp[2] = pal[0] >> 2; pp[1] = pal[1] >> 2; pp[0] = pal[2] >> 2; pp += 4; pal += 3; } regs.x.ax = 0x4F09; regs.x.bx = 0; regs.x.cx = 256; regs.x.dx = 0; regs.x.es = ptr2real(ppal) >> 4; regs.x.di = ptr2real(ppal) & 0xf; dos_int86(0x10); if (regs.x.ax != 0x4f) Sys_Error ("Unable to load VESA palette\n"); } /* ================ VID_ExtraFarToLinear ================ */ void *VID_ExtraFarToLinear (void *ptr) { int temp; temp = (int)ptr; return real2ptr(((temp & 0xFFFF0000) >> 12) + (temp & 0xFFFF)); } /* ================ VID_ExtraWaitDisplayEnable ================ */ void VID_ExtraWaitDisplayEnable () { while ((inportb (0x3DA) & 0x01) == 1) ; } /* ================ VID_ExtraVidLookForState ================ */ qboolean VID_ExtraVidLookForState (unsigned state, unsigned mask) { int i; double starttime, time; starttime = Sys_DoubleTime (); do { for (i=0 ; i<100000 ; i++) { if ((inportb (0x3DA) & mask) == state) return true; } time = Sys_DoubleTime (); } while ((time - starttime) < 0.1); return false; } /* ================ VID_ExtraStateFound ================ */ qboolean VID_ExtraStateFound (unsigned state) { int i, workingstate; workingstate = 0; for (i=0 ; i<10 ; i++) { if (!VID_ExtraVidLookForState(workingstate, state)) { return false; } workingstate ^= state; } return true; } /* ================ VID_InitExtra ================ */ void VID_InitExtra (void) { int nummodes; short *pmodenums; vbeinfoblock_t *pinfoblock; __dpmi_meminfo phys_mem_info; pinfoblock = dos_getmemory(sizeof(vbeinfoblock_t)); *(long *)pinfoblock->VbeSignature = 'V' + ('B'<<8) + ('E'<<16) + ('2'<<24); // see if VESA support is available regs.x.ax = 0x4f00; regs.x.es = ptr2real(pinfoblock) >> 4; regs.x.di = ptr2real(pinfoblock) & 0xf; dos_int86(0x10); if (regs.x.ax != 0x4f) return; // no VESA support if (pinfoblock->VbeVersion[1] < 0x02) return; // not VESA 2.0 or greater Con_Printf ("VESA 2.0 compliant adapter:\n%s\n", VID_ExtraFarToLinear (*(byte **)&pinfoblock->OemStringPtr[0])); totalvidmem = *(unsigned short *)&pinfoblock->TotalMemory[0] << 16; pmodenums = (short *) VID_ExtraFarToLinear (*(byte **)&pinfoblock->VideoModePtr[0]); // find 8 bit modes until we either run out of space or run out of modes nummodes = 0; while ((*pmodenums != -1) && (nummodes < MAX_VESA_MODES)) { if (VID_ExtraGetModeInfo (*pmodenums)) { vesa_modes[nummodes].pnext = &vesa_modes[nummodes+1]; if (modeinfo.width > 999) { if (modeinfo.height > 999) { sprintf (&names[nummodes][0], "%4dx%4d", modeinfo.width, modeinfo.height); names[nummodes][9] = 0; } else { sprintf (&names[nummodes][0], "%4dx%3d", modeinfo.width, modeinfo.height); names[nummodes][8] = 0; } } else { if (modeinfo.height > 999) { sprintf (&names[nummodes][0], "%3dx%4d", modeinfo.width, modeinfo.height); names[nummodes][8] = 0; } else { sprintf (&names[nummodes][0], "%3dx%3d", modeinfo.width, modeinfo.height); names[nummodes][7] = 0; } } vesa_modes[nummodes].name = &names[nummodes][0]; vesa_modes[nummodes].width = modeinfo.width; vesa_modes[nummodes].height = modeinfo.height; vesa_modes[nummodes].aspect = ((float)modeinfo.height / (float)modeinfo.width) * (320.0 / 240.0); vesa_modes[nummodes].rowbytes = modeinfo.bytes_per_scanline; vesa_modes[nummodes].planar = 0; vesa_modes[nummodes].pextradata = &vesa_extra[nummodes]; vesa_modes[nummodes].setmode = VID_ExtraInitMode; vesa_modes[nummodes].swapbuffers = VID_ExtraSwapBuffers; vesa_modes[nummodes].setpalette = VID_SetVESAPalette; if (modeinfo.mode_attributes & LINEAR_FRAME_BUFFER) { // add linear bit to mode for linear modes vesa_extra[nummodes].vesamode = modeinfo.modenum | LINEAR_MODE; vesa_extra[nummodes].pages[0] = 0; vesa_extra[nummodes].pages[1] = modeinfo.pagesize; vesa_extra[nummodes].pages[2] = modeinfo.pagesize * 2; vesa_modes[nummodes].numpages = modeinfo.numpages; vesa_modes[nummodes].begindirectrect = VGA_BeginDirectRect; vesa_modes[nummodes].enddirectrect = VGA_EndDirectRect; phys_mem_info.address = (int)modeinfo.pptr; phys_mem_info.size = 0x400000; if (__dpmi_physical_address_mapping(&phys_mem_info)) goto NextMode; vesa_extra[nummodes].plinearmem = real2ptr (phys_mem_info.address); } else { // banked at 0xA0000 vesa_extra[nummodes].vesamode = modeinfo.modenum; vesa_extra[nummodes].pages[0] = 0; vesa_extra[nummodes].plinearmem = real2ptr(modeinfo.winasegment<<4); vesa_modes[nummodes].begindirectrect = VGA_BankedBeginDirectRect; vesa_modes[nummodes].enddirectrect = VGA_BankedEndDirectRect; vesa_extra[nummodes].pages[1] = modeinfo.pagesize; vesa_extra[nummodes].pages[2] = modeinfo.pagesize * 2; vesa_modes[nummodes].numpages = modeinfo.numpages; } vesa_extra[nummodes].vga_incompatible = modeinfo.mode_attributes & VGA_INCOMPATIBLE; nummodes++; } NextMode: pmodenums++; } // add the VESA modes at the start of the mode list (if there are any) if (nummodes) { vesa_modes[nummodes-1].pnext = pvidmodes; pvidmodes = &vesa_modes[0]; numvidmodes += nummodes; ppal = dos_getmemory(256*4); } dos_freememory(pinfoblock); } /* ================ VID_ExtraGetModeInfo ================ */ qboolean VID_ExtraGetModeInfo(int modenum) { char *infobuf; int numimagepages; infobuf = dos_getmemory(256); regs.x.ax = 0x4f01; regs.x.cx = modenum; regs.x.es = ptr2real(infobuf) >> 4; regs.x.di = ptr2real(infobuf) & 0xf; dos_int86(0x10); if (regs.x.ax != 0x4f) { return false; } else { modeinfo.modenum = modenum; modeinfo.bits_per_pixel = *(char*)(infobuf+25); modeinfo.bytes_per_pixel = (modeinfo.bits_per_pixel+1)/8; modeinfo.width = *(short*)(infobuf+18); modeinfo.height = *(short*)(infobuf+20); // we do only 8-bpp in software if ((modeinfo.bits_per_pixel != 8) || (modeinfo.bytes_per_pixel != 1) || (modeinfo.width > MAXWIDTH) || (modeinfo.height > MAXHEIGHT)) { return false; } modeinfo.mode_attributes = *(short*)infobuf; // we only want color graphics modes that are supported by the hardware if ((modeinfo.mode_attributes & (MODE_SUPPORTED_IN_HW | COLOR_MODE | GRAPHICS_MODE)) != (MODE_SUPPORTED_IN_HW | COLOR_MODE | GRAPHICS_MODE)) { return false; } // we only work with linear frame buffers, except for 320x200, which can // effectively be linear when banked at 0xA000 if (!(modeinfo.mode_attributes & LINEAR_FRAME_BUFFER)) { if ((modeinfo.width != 320) || (modeinfo.height != 200)) return false; } modeinfo.bytes_per_scanline = *(short*)(infobuf+16); modeinfo.pagesize = modeinfo.bytes_per_scanline * modeinfo.height; if (modeinfo.pagesize > totalvidmem) return false; // force to one page if the adapter reports it doesn't support more pages // than that, no matter how much memory it has--it may not have hardware // support for page flipping numimagepages = *(unsigned char *)(infobuf+29); if (numimagepages <= 0) { // wrong, but there seems to be an ATI VESA driver that reports 0 modeinfo.numpages = 1; } else if (numimagepages < 3) { modeinfo.numpages = numimagepages; } else { modeinfo.numpages = 3; } if (*(char*)(infobuf+2) & 5) { modeinfo.winasegment = *(unsigned short*)(infobuf+8); modeinfo.win = 0; } else if (*(char*)(infobuf+3) & 5) { modeinfo.winbsegment = *(unsigned short*)(infobuf+8); modeinfo.win = 1; } modeinfo.granularity = *(short*)(infobuf+4) * 1024; modeinfo.win_size = *(short*)(infobuf+6) * 1024; modeinfo.bits_per_pixel = *(char*)(infobuf+25); modeinfo.bytes_per_pixel = (modeinfo.bits_per_pixel+1)/8; modeinfo.memory_model = *(unsigned char*)(infobuf+27); modeinfo.num_pages = *(char*)(infobuf+29) + 1; modeinfo.red_width = *(char*)(infobuf+31); modeinfo.red_pos = *(char*)(infobuf+32); modeinfo.green_width = *(char*)(infobuf+33); modeinfo.green_pos = *(char*)(infobuf+34); modeinfo.blue_width = *(char*)(infobuf+35); modeinfo.blue_pos = *(char*)(infobuf+36); modeinfo.pptr = *(long *)(infobuf+40); #if 0 printf("VID: (VESA) info for mode 0x%x\n", modeinfo.modenum); printf(" mode attrib = 0x%0x\n", modeinfo.mode_attributes); printf(" win a attrib = 0x%0x\n", *(unsigned char*)(infobuf+2)); printf(" win b attrib = 0x%0x\n", *(unsigned char*)(infobuf+3)); printf(" win a seg 0x%0x\n", (int) modeinfo.winasegment); printf(" win b seg 0x%0x\n", (int) modeinfo.winbsegment); printf(" bytes per scanline = %d\n", modeinfo.bytes_per_scanline); printf(" width = %d, height = %d\n", modeinfo.width, modeinfo.height); printf(" win = %c\n", 'A' + modeinfo.win); printf(" win granularity = %d\n", modeinfo.granularity); printf(" win size = %d\n", modeinfo.win_size); printf(" bits per pixel = %d\n", modeinfo.bits_per_pixel); printf(" bytes per pixel = %d\n", modeinfo.bytes_per_pixel); printf(" memory model = 0x%x\n", modeinfo.memory_model); printf(" num pages = %d\n", modeinfo.num_pages); printf(" red width = %d\n", modeinfo.red_width); printf(" red pos = %d\n", modeinfo.red_pos); printf(" green width = %d\n", modeinfo.green_width); printf(" green pos = %d\n", modeinfo.green_pos); printf(" blue width = %d\n", modeinfo.blue_width); printf(" blue pos = %d\n", modeinfo.blue_pos); printf(" phys mem = %x\n", modeinfo.pptr); #endif } dos_freememory(infobuf); return true; } /* ================ VID_ExtraInitMode ================ */ int VID_ExtraInitMode (viddef_t *lvid, vmode_t *pcurrentmode) { vesa_extra_t *pextra; int pageoffset; pextra = pcurrentmode->pextradata; if (vid_nopageflip->value) lvid->numpages = 1; else lvid->numpages = pcurrentmode->numpages; // clean up any old vid buffer lying around, alloc new if needed if (!VGA_FreeAndAllocVidbuffer (lvid, lvid->numpages == 1)) return -1; // memory alloc failed // clear the screen and wait for the next frame. VGA_pcurmode, which // VGA_ClearVideoMem relies on, is guaranteed to be set because mode 0 is // always the first mode set in a session if (VGA_pcurmode) VGA_ClearVideoMem (VGA_pcurmode->planar); // set the mode regs.x.ax = 0x4f02; regs.x.bx = pextra->vesamode; dos_int86(0x10); if (regs.x.ax != 0x4f) return 0; VID_banked = !(pextra->vesamode & LINEAR_MODE); VID_membase = pextra->plinearmem; VGA_width = lvid->width; VGA_height = lvid->height; VGA_rowbytes = lvid->rowbytes; lvid->colormap = host_colormap; VID_pagelist = &pextra->pages[0]; // wait for display enable by default only when triple-buffering on a VGA- // compatible machine that actually has a functioning display enable status vsync_exists = VID_ExtraStateFound (0x08); de_exists = VID_ExtraStateFound (0x01); if (!pextra->vga_incompatible && (lvid->numpages == 3) && de_exists && (_vid_wait_override->value == 0.0)) { Cvar_SetValue(vid_wait, (float)VID_WAIT_DISPLAY_ENABLE); VID_displayedpage = 0; VID_currentpage = 1; } else { if ((lvid->numpages == 1) && (_vid_wait_override->value == 0.0)) { Cvar_SetValue(vid_wait, (float)VID_WAIT_NONE); VID_displayedpage = VID_currentpage = 0; } else { Cvar_SetValue(vid_wait, (float)VID_WAIT_VSYNC); VID_displayedpage = 0; if (lvid->numpages > 1) VID_currentpage = 1; else VID_currentpage = 0; } } // TODO: really should be a call to a function pageoffset = VID_pagelist[VID_displayedpage]; regs.x.ax = 0x4f07; regs.x.bx = 0x80; // wait for vsync so we know page 0 is visible regs.x.cx = pageoffset % VGA_rowbytes; regs.x.dx = pageoffset / VGA_rowbytes; dos_int86(0x10); if (VID_banked) { regs.x.ax = 0x4f05; regs.x.bx = 0; regs.x.dx = VID_currentpage; dos_int86(0x10); VGA_pagebase = VID_membase; } else { VGA_pagebase = VID_membase + VID_pagelist[VID_currentpage]; } if (lvid->numpages > 1) { lvid->buffer = VGA_pagebase; lvid->conbuffer = lvid->buffer; } else { lvid->rowbytes = lvid->width; } lvid->direct = VGA_pagebase; lvid->conrowbytes = lvid->rowbytes; lvid->conwidth = lvid->width; lvid->conheight = lvid->height; lvid->maxwarpwidth = WARP_WIDTH; lvid->maxwarpheight = WARP_HEIGHT; VGA_pcurmode = pcurrentmode; D_InitCaches (vid_surfcache, vid_surfcachesize); return 1; } /* ================ VID_ExtraSwapBuffers ================ */ void VID_ExtraSwapBuffers (viddef_t *lvid, vmode_t *pcurrentmode, vrect_t *rects) { int pageoffset; UNUSED(rects); UNUSED(pcurrentmode); pageoffset = VID_pagelist[VID_currentpage]; // display the newly finished page if (lvid->numpages > 1) { // page flipped regs.x.ax = 0x4f07; if (vid_wait->value != VID_WAIT_VSYNC) { if ((vid_wait->value == VID_WAIT_DISPLAY_ENABLE) && de_exists) VID_ExtraWaitDisplayEnable (); regs.x.bx = VESA_DONT_WAIT_VSYNC; } else { regs.x.bx = VESA_WAIT_VSYNC; // double buffered has to wait } regs.x.cx = pageoffset % VGA_rowbytes; regs.x.dx = pageoffset / VGA_rowbytes; dos_int86(0x10); VID_displayedpage = VID_currentpage; if (++VID_currentpage >= lvid->numpages) VID_currentpage = 0; // // set the new write window if this is a banked mode; otherwise, set the // new address to which to write // if (VID_banked) { regs.x.ax = 0x4f05; regs.x.bx = 0; regs.x.dx = VID_currentpage; dos_int86(0x10); } else { lvid->direct = lvid->buffer; // direct drawing goes to the // currently displayed page lvid->buffer = VID_membase + VID_pagelist[VID_currentpage]; lvid->conbuffer = lvid->buffer; } VGA_pagebase = lvid->buffer; } else { // non-page-flipped if (vsync_exists && (vid_wait->value == VID_WAIT_VSYNC)) { VGA_WaitVsync (); } while (rects) { VGA_UpdateLinearScreen ( lvid->buffer + rects->x + (rects->y * lvid->rowbytes), VGA_pagebase + rects->x + (rects->y * VGA_rowbytes), rects->width, rects->height, lvid->rowbytes, VGA_rowbytes); rects = rects->pnext; } } }