366 lines
9.0 KiB
C
366 lines
9.0 KiB
C
#include "quakedef.h"
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#ifdef SWQUAKE
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#include "sw.h"
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/* from http://www.delorie.com/djgpp/doc/ug/graphics/vesa.html */
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typedef struct VESA_INFO
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{
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unsigned char VESASignature[4];
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unsigned short VESAVersion __attribute__ ((packed));
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unsigned long OEMStringPtr __attribute__ ((packed));
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unsigned char Capabilities[4];
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unsigned long VideoModePtr __attribute__ ((packed));
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unsigned short TotalMemory __attribute__ ((packed));
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unsigned short OemSoftwareRev __attribute__ ((packed));
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unsigned long OemVendorNamePtr __attribute__ ((packed));
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unsigned long OemProductNamePtr __attribute__ ((packed));
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unsigned long OemProductRevPtr __attribute__ ((packed));
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unsigned char Reserved[222];
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unsigned char OemData[256];
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} VESA_INFO;
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#include <dpmi.h>
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#include <go32.h>
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#include <sys/farptr.h>
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static VESA_INFO vesa_info;
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static int get_vesa_info()
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{
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__dpmi_regs r;
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long dosbuf;
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int c;
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/* use the conventional memory transfer buffer */
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dosbuf = __tb & 0xFFFFF;
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/* initialize the buffer to zero */
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for (c=0; c<sizeof(VESA_INFO); c++)
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_farpokeb(_dos_ds, dosbuf+c, 0);
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dosmemput("VBE2", 4, dosbuf);
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/* call the VESA function */
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r.x.ax = 0x4F00;
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r.x.di = dosbuf & 0xF;
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r.x.es = (dosbuf>>4) & 0xFFFF;
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__dpmi_int(0x10, &r);
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/* quit if there was an error */
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if (r.h.ah)
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return -1;
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/* copy the resulting data into our structure */
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dosmemget(dosbuf, sizeof(VESA_INFO), &vesa_info);
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/* check that we got the right magic marker value */
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if (strncmp(vesa_info.VESASignature, "VESA", 4) != 0)
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return -1;
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/* it worked! */
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return 0;
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}
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typedef struct MODE_INFO
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{
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unsigned short ModeAttributes __attribute__ ((packed));
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unsigned char WinAAttributes;
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unsigned char WinBAttributes;
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unsigned short WinGranularity __attribute__ ((packed));
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unsigned short WinSize __attribute__ ((packed));
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unsigned short WinASegment __attribute__ ((packed));
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unsigned short WinBSegment __attribute__ ((packed));
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unsigned long WinFuncPtr __attribute__ ((packed));
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unsigned short BytesPerScanLine __attribute__ ((packed));
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unsigned short XResolution __attribute__ ((packed));
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unsigned short YResolution __attribute__ ((packed));
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unsigned char XCharSize;
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unsigned char YCharSize;
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unsigned char NumberOfPlanes;
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unsigned char BitsPerPixel;
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unsigned char NumberOfBanks;
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unsigned char MemoryModel;
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unsigned char BankSize;
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unsigned char NumberOfImagePages;
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unsigned char Reserved_page;
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unsigned char RedMaskSize;
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unsigned char RedMaskPos;
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unsigned char GreenMaskSize;
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unsigned char GreenMaskPos;
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unsigned char BlueMaskSize;
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unsigned char BlueMaskPos;
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unsigned char ReservedMaskSize;
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unsigned char ReservedMaskPos;
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unsigned char DirectColorModeInfo;
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unsigned long PhysBasePtr __attribute__ ((packed));
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unsigned long OffScreenMemOffset __attribute__ ((packed));
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unsigned short OffScreenMemSize __attribute__ ((packed));
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unsigned char Reserved[206];
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} MODE_INFO;
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static MODE_INFO mode_info;
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static int get_mode_info(int mode)
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{
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__dpmi_regs r;
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long dosbuf;
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int c;
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/* use the conventional memory transfer buffer */
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dosbuf = __tb & 0xFFFFF;
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/* initialize the buffer to zero */
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for (c=0; c<sizeof(MODE_INFO); c++)
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_farpokeb(_dos_ds, dosbuf+c, 0);
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/* call the VESA function */
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r.x.ax = 0x4F01;
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r.x.di = dosbuf & 0xF;
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r.x.es = (dosbuf>>4) & 0xFFFF;
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r.x.cx = mode;
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__dpmi_int(0x10, &r);
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/* quit if there was an error */
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if (r.h.ah)
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return -1;
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/* copy the resulting data into our structure */
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dosmemget(dosbuf, sizeof(MODE_INFO), &mode_info);
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/* it worked! */
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return 0;
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}
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static int find_vesa_mode(int w, int h, int bpp)
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{
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int mode_list[256];
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int number_of_modes;
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long mode_ptr;
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int c;
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/* check that the VESA driver exists, and get information about it */
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if (get_vesa_info() != 0)
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return 0;
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/* convert the mode list pointer from seg:offset to a linear address */
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mode_ptr = ((vesa_info.VideoModePtr & 0xFFFF0000) >> 12) + (vesa_info.VideoModePtr & 0xFFFF);
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number_of_modes = 0;
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/* read the list of available modes */
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while (_farpeekw(_dos_ds, mode_ptr) != 0xFFFF)
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{
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mode_list[number_of_modes] = _farpeekw(_dos_ds, mode_ptr);
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number_of_modes++;
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mode_ptr += 2;
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}
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/* scan through the list of modes looking for the one that we want */
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for (c=0; c<number_of_modes; c++)
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{
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/* get information about this mode */
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if (get_mode_info(mode_list[c]) != 0)
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continue;
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/* check the flags field to make sure this is a color graphics mode,
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* and that it is supported by the current hardware */
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if ((mode_info.ModeAttributes & 0x19) != 0x19)
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continue;
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/* check that this mode is the right size */
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if ((mode_info.XResolution != w) || (mode_info.YResolution != h))
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continue;
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/* check that there is only one color plane */
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if (mode_info.NumberOfPlanes != 1)
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continue;
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/* check that it is a packed-pixel mode (other values are used for
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* different memory layouts, eg. 6 for a truecolor resolution) */
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if (mode_info.MemoryModel != ((bpp==8)?4:6))
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continue;
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/* check that this is an 8-bit (256 color) mode */
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if (mode_info.BitsPerPixel != bpp)
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continue;
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/* if it passed all those checks, this must be the mode we want! */
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return mode_list[c];
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}
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/* oh dear, there was no mode matching the one we wanted! */
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return 0;
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}
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static int set_vesa_mode(int w, int h, int bpp)
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{
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__dpmi_regs r;
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int mode_number;
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/* find the number for this mode */
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mode_number = find_vesa_mode(w, h, bpp);
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if (!mode_number)
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return -1;
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/* call the VESA mode set function */
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r.x.ax = 0x4F02;
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r.x.bx = mode_number;
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__dpmi_int(0x10, &r);
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if (r.h.ah)
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return -1;
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/* it worked! */
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return 0;
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}
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void set_vesa_bank(int bank_number)
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{
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__dpmi_regs r;
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r.x.ax = 0x4F05;
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r.x.bx = 0;
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r.x.dx = bank_number;
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__dpmi_int(0x10, &r);
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}
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static void copy_to_vesa_screen(char *memory_buffer, int screen_size)
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{
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//FIXME: use OffScreenMemOffset if possible.
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int bank_size = mode_info.WinSize*1024;
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int bank_granularity = mode_info.WinGranularity*1024;
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int bank_number = 0;
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int todo = screen_size;
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int copy_size;
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while (todo > 0)
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{
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/* select the appropriate bank */
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set_vesa_bank(bank_number);
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/* how much can we copy in one go? */
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if (todo > bank_size)
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copy_size = bank_size;
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else
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copy_size = todo;
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/* copy a bank of data to the screen */
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dosmemput(memory_buffer, copy_size, 0xA0000);
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/* move on to the next bank of data */
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todo -= copy_size;
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memory_buffer += copy_size;
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bank_number += bank_size/bank_granularity;
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}
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}
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extern int nostdout; //we flag with 0x800 to disable printfs while displaying stuff.
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static qboolean videoatexitregistered;
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static void videoatexit(void)
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{
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if (nostdout & 0x800)
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{
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nostdout &= ~0x800;
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__dpmi_regs r;
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r.x.ax = 0x0000 | 3;
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__dpmi_int(0x10, &r);
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}
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}
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static unsigned int *backbuffer;
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static unsigned int *depthbuffer;
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static unsigned int framenumber;
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//#define NORENDER
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qboolean SW_VID_Init(rendererstate_t *info, unsigned char *palette)
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{
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int bpp = info->bpp;
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vid.pixelwidth = info->width;
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vid.pixelheight = info->height;
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if (bpp != 32)
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bpp = 32; //sw renderer supports only this
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#ifndef NORENDER
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nostdout |= 0x800;
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if (set_vesa_mode(vid.pixelwidth, vid.pixelheight, bpp) < 0)
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return false;
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#endif
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if (!videoatexitregistered)
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{
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videoatexitregistered = true;
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atexit(videoatexit);
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}
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backbuffer = BZ_Malloc(vid.pixelwidth * vid.pixelheight * sizeof(*backbuffer));
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if (!backbuffer)
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return false;
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depthbuffer = BZ_Malloc(vid.pixelwidth * vid.pixelheight * sizeof(*depthbuffer));
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if (!depthbuffer)
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return false;
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return true;
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}
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void SW_VID_DeInit(void)
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{
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BZ_Free(backbuffer);
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backbuffer = NULL;
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BZ_Free(depthbuffer);
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depthbuffer = NULL;
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}
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qboolean SW_VID_ApplyGammaRamps (unsigned int rampcount, unsigned short *ramps)
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{ //no gamma ramps with VESA.
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return false;
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}
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char *SW_VID_GetRGBInfo(int *bytestride, int *truevidwidth, int *truevidheight, enum uploadfmt *fmt)
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{
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void *ret = BZ_Malloc(vid.pixelwidth*vid.pixelheight*4);
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if (!ret)
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return NULL;
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memcpy(ret, backbuffer, vid.pixelwidth*vid.pixelheight*4);
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*bytestride = vid.pixelwidth*4;
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*truevidwidth = vid.pixelwidth;
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*truevidheight = vid.pixelheight;
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*fmt = TF_BGRX32;
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return ret;
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}
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void SW_VID_SetWindowCaption(const char *msg)
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{
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}
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void SW_VID_SwapBuffers(void)
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{
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#ifndef NORENDER
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copy_to_vesa_screen((char*)backbuffer, vid.pixelwidth*vid.pixelheight*4);
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#endif
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framenumber++;
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}
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void SW_VID_UpdateViewport(wqcom_t *com)
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{
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com->viewport.cbuf = backbuffer + vid.pixelwidth*(vid.pixelheight-1);
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com->viewport.dbuf = depthbuffer;
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com->viewport.width = vid.pixelwidth;
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com->viewport.height = vid.pixelheight;
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com->viewport.stride = -vid.pixelwidth; //this is in pixels. which is stupid.
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com->viewport.framenum = framenumber;
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}
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#endif
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