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linux/rw_svgalib.c
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311
linux/rw_svgalib.c
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/*
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** RW_SVGALBI.C
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**
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** This file contains ALL Linux specific stuff having to do with the
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** software refresh. When a port is being made the following functions
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** must be implemented by the port:
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**
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** SWimp_EndFrame
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** SWimp_Init
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** SWimp_InitGraphics
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** SWimp_SetPalette
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** SWimp_Shutdown
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** SWimp_SwitchFullscreen
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*/
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#include <termios.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/vt.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <signal.h>
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#include <sys/mman.h>
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#include <asm/io.h>
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#include "vga.h"
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#include "vgakeyboard.h"
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#include "vgamouse.h"
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#include "../ref_soft/r_local.h"
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#include "../client/keys.h"
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#include "../linux/rw_linux.h"
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/*****************************************************************************/
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int VGA_width, VGA_height, VGA_rowbytes, VGA_bufferrowbytes, VGA_planar;
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byte *VGA_pagebase;
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char *framebuffer_ptr;
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void VGA_UpdatePlanarScreen (void *srcbuffer);
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int num_modes;
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vga_modeinfo *modes;
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int current_mode;
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// Console variables that we need to access from this module
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/*****************************************************************************/
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void VID_InitModes(void)
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{
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int i;
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// get complete information on all modes
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num_modes = vga_lastmodenumber()+1;
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modes = malloc(num_modes * sizeof(vga_modeinfo));
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for (i=0 ; i<num_modes ; i++)
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{
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if (vga_hasmode(i))
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memcpy(&modes[i], vga_getmodeinfo(i), sizeof (vga_modeinfo));
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else
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modes[i].width = 0; // means not available
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}
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// filter for modes i don't support
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for (i=0 ; i<num_modes ; i++)
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{
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if (modes[i].bytesperpixel != 1 && modes[i].colors != 256)
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modes[i].width = 0;
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}
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for (i = 0; i < num_modes; i++)
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if (modes[i].width)
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ri.Con_Printf(PRINT_ALL, "mode %d: %d %d\n", modes[i].width, modes[i].height);
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}
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/*
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** SWimp_Init
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**
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** This routine is responsible for initializing the implementation
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** specific stuff in a software rendering subsystem.
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*/
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int SWimp_Init( void *hInstance, void *wndProc )
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{
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vga_init();
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VID_InitModes();
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return true;
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}
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int get_mode(int width, int height)
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{
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int i;
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int ok, match;
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for (i=0 ; i<num_modes ; i++)
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if (modes[i].width &&
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modes[i].width == width && modes[i].height == height)
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break;
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if (i==num_modes)
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return -1; // not found
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return i;
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}
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/*
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** SWimp_InitGraphics
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**
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** This initializes the software refresh's implementation specific
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** graphics subsystem. In the case of Windows it creates DIB or
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** DDRAW surfaces.
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**
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** The necessary width and height parameters are grabbed from
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** vid.width and vid.height.
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*/
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static qboolean SWimp_InitGraphics( qboolean fullscreen )
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{
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int bsize, zsize, tsize;
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SWimp_Shutdown();
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current_mode = get_mode(vid.width, vid.height);
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if (current_mode < 0) {
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ri.Con_Printf (PRINT_ALL, "Mode %d %d not found\n", vid.width, vid.height);
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return false; // mode not found
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}
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// let the sound and input subsystems know about the new window
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ri.Vid_NewWindow (vid.width, vid.height);
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ri.Con_Printf (PRINT_ALL, "Setting VGAMode: %d\n", current_mode );
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// Cvar_SetValue ("vid_mode", (float)modenum);
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VGA_width = modes[current_mode].width;
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VGA_height = modes[current_mode].height;
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VGA_planar = modes[current_mode].bytesperpixel == 0;
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VGA_rowbytes = modes[current_mode].linewidth;
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vid.rowbytes = modes[current_mode].linewidth;
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if (VGA_planar) {
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VGA_bufferrowbytes = modes[current_mode].linewidth * 4;
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vid.rowbytes = modes[current_mode].linewidth*4;
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}
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// get goin'
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vga_setmode(current_mode);
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VGA_pagebase = framebuffer_ptr = (char *) vga_getgraphmem();
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// if (vga_setlinearaddressing()>0)
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// framebuffer_ptr = (char *) vga_getgraphmem();
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if (!framebuffer_ptr)
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Sys_Error("This mode isn't hapnin'\n");
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vga_setpage(0);
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vid.buffer = malloc(vid.rowbytes * vid.height);
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if (!vid.buffer)
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Sys_Error("Unabled to alloc vid.buffer!\n");
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return true;
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}
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/*
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** SWimp_EndFrame
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**
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** This does an implementation specific copy from the backbuffer to the
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** front buffer. In the Win32 case it uses BitBlt or BltFast depending
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** on whether we're using DIB sections/GDI or DDRAW.
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*/
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void SWimp_EndFrame (void)
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{
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if (!vga_oktowrite())
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return; // can't update screen if it's not active
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// if (vid_waitforrefresh.value)
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// vga_waitretrace();
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if (VGA_planar)
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VGA_UpdatePlanarScreen (vid.buffer);
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else {
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int total = vid.rowbytes * vid.height;
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int offset;
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for (offset=0;offset<total;offset+=0x10000) {
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vga_setpage(offset/0x10000);
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memcpy(framebuffer_ptr,
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vid.buffer + offset,
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((total-offset>0x10000)?0x10000:(total-offset)));
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}
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}
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}
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/*
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** SWimp_SetMode
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*/
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rserr_t SWimp_SetMode( int *pwidth, int *pheight, int mode, qboolean fullscreen )
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{
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rserr_t retval = rserr_ok;
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ri.Con_Printf (PRINT_ALL, "setting mode %d:", mode );
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if ( !ri.Vid_GetModeInfo( pwidth, pheight, mode ) )
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{
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ri.Con_Printf( PRINT_ALL, " invalid mode\n" );
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return rserr_invalid_mode;
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}
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ri.Con_Printf( PRINT_ALL, " %d %d\n", *pwidth, *pheight);
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if ( !SWimp_InitGraphics( false ) ) {
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// failed to set a valid mode in windowed mode
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return rserr_invalid_mode;
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}
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R_GammaCorrectAndSetPalette( ( const unsigned char * ) d_8to24table );
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return retval;
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}
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/*
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** SWimp_SetPalette
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**
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** System specific palette setting routine. A NULL palette means
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** to use the existing palette. The palette is expected to be in
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** a padded 4-byte xRGB format.
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*/
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void SWimp_SetPalette( const unsigned char *palette )
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{
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static int tmppal[256*3];
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const unsigned char *pal;
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int *tp;
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int i;
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if ( !palette )
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palette = ( const unsigned char * ) sw_state.currentpalette;
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if (vga_getcolors() == 256)
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{
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tp = tmppal;
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pal = palette;
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for (i=0 ; i < 256 ; i++, pal += 4, tp += 3) {
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tp[0] = pal[0] >> 2;
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tp[1] = pal[1] >> 2;
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tp[2] = pal[2] >> 2;
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}
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if (vga_oktowrite())
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vga_setpalvec(0, 256, tmppal);
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}
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}
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/*
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** SWimp_Shutdown
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**
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** System specific graphics subsystem shutdown routine. Destroys
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** DIBs or DDRAW surfaces as appropriate.
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*/
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void SWimp_Shutdown( void )
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{
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if (vid.buffer) {
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free(vid.buffer);
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vid.buffer = NULL;
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}
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vga_setmode(TEXT);
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}
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/*
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** SWimp_AppActivate
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*/
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void SWimp_AppActivate( qboolean active )
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{
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}
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//===============================================================================
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/*
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================
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Sys_MakeCodeWriteable
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================
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*/
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void Sys_MakeCodeWriteable (unsigned long startaddr, unsigned long length)
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{
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int r;
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unsigned long addr;
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int psize = getpagesize();
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addr = (startaddr & ~(psize-1)) - psize;
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// fprintf(stderr, "writable code %lx(%lx)-%lx, length=%lx\n", startaddr,
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// addr, startaddr+length, length);
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r = mprotect((char*)addr, length + startaddr - addr + psize, 7);
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if (r < 0)
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Sys_Error("Protection change failed\n");
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}
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