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#include <stdlib.h>
#include <string.h>
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#include "../../lib/sys/vesa/vesa.h"
#include "../../lib/sys/vesa/video.h"
static int __constfunc is_power_of_2(unsigned int x)
{
return x && !(x & (x-1));
}
static int vesacon_paged_mode_ok(const struct vesa_mode_info *mi)
{
int i;
if (!is_power_of_2(mi->win_size) ||
!is_power_of_2(mi->win_grain) ||
mi->win_grain > mi->win_size)
return 0; /* Impossible... */
for (i = 0; i < 2; i++) {
if ((mi->win_attr[i] & 0x05) == 0x05 && mi->win_seg[i])
return 1; /* Usable window */
}
return 0; /* Nope... */
}
static int vesa_getmodes(lua_State *L)
{
com32sys_t rm;
uint16_t mode, bestmode, *mode_ptr;
struct vesa_general_info *gi;
struct vesa_mode_info *mi;
enum vesa_pixel_format bestpxf;
int nmode = 1;
/* Allocate space in the bounce buffer for these structures */
gi = &((struct vesa_info *)__com32.cs_bounce)->gi;
mi = &((struct vesa_info *)__com32.cs_bounce)->mi;
memset(&rm, 0, sizeof rm);
memset(gi, 0, sizeof *gi);
gi->signature = VBE2_MAGIC; /* Get VBE2 extended data */
rm.eax.w[0] = 0x4F00; /* Get SVGA general information */
rm.edi.w[0] = OFFS(gi);
rm.es = SEG(gi);
__intcall(0x10, &rm, &rm);
if ( rm.eax.w[0] != 0x004F )
return -1; /* Function call failed */
if ( gi->signature != VESA_MAGIC )
return -2; /* No magic */
if ( gi->version < 0x0102 )
return -3; /* VESA 1.2+ required */
lua_newtable(L); /* list of modes */
/* Copy general info */
memcpy(&__vesa_info.gi, gi, sizeof *gi);
/* Search for a 640x480 mode with a suitable color and memory model... */
mode_ptr = GET_PTR(gi->video_mode_ptr);
bestmode = 0;
bestpxf = PXF_NONE;
while ((mode = *mode_ptr++) != 0xFFFF) {
mode &= 0x1FF; /* The rest are attributes of sorts */
printf("Found mode: 0x%04x (%dx%dx%d)\n", mode, mi->h_res, mi->v_res, mi->bpp);
memset(mi, 0, sizeof *mi);
rm.eax.w[0] = 0x4F01; /* Get SVGA mode information */
rm.ecx.w[0] = mode;
rm.edi.w[0] = OFFS(mi);
rm.es = SEG(mi);
__intcall(0x10, &rm, &rm);
/* Must be a supported mode */
if ( rm.eax.w[0] != 0x004f )
continue;
lua_pushnumber(L, nmode++);
lua_newtable(L); /* mode info */
lua_pushstring(L, "mode");
lua_pushnumber(L, mode);
lua_settable(L,-3);
lua_pushstring(L, "hres");
lua_pushnumber(L, mi->h_res);
lua_settable(L,-3);
lua_pushstring(L, "vres");
lua_pushnumber(L, mi->v_res);
lua_settable(L,-3);
lua_pushstring(L, "bpp");
lua_pushnumber(L, mi->bpp);
lua_settable(L,-3);
lua_settable(L, -3); /* add to mode list */
}
return 1;
}
static const luaL_reg vesalib[] = {
{"getmodes", vesa_getmodes},
{NULL, NULL}
};
/* This defines a function that opens up your library. */
LUALIB_API int luaopen_vesa (lua_State *L) {
luaL_openlib(L, LUA_VESALIBNAME, vesalib, 0);
return 1;
}
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