bool screen_init (void)
{
#ifdef LINUXFB
use_fb = 1;
if (fb_init ())
{
use_fb = 0;
return false;
}
#endif
#ifdef VGALIB
use_fb = 0;
vga_init ();
vga_setmode(DEFAULT_VGA_MODE);
gl_setcontextvga(DEFAULT_VGA_MODE);
physical_screen = gl_allocatecontext();
gl_getcontext(physical_screen);
gl_setcontextvgavirtual(DEFAULT_VGA_MODE);
virtual_screen = gl_allocatecontext();
gl_getcontext(virtual_screen);
gl_setcontext(virtual_screen);
//vga_ext_set(VGA_EXT_SET, VGA_CLUT8);
// color table:
// http://en.wikipedia.org/wiki/ANSI_escape_code#Colors
gl_setpalettecolor(BLUE, 0, 0, 63); // blue
gl_setpalettecolor(BLACK, 0, 0, 0); // black
gl_setpalettecolor(GREEN, 0, 63, 0);
gl_setpalettecolor(RED, 63, 0, 0);
gl_setpalettecolor(BROWN, 170/4, 85/4, 0);
gl_setpalettecolor(MAGENTA, 170/4, 0, 170/4);
gl_setpalettecolor(CYAN, 0, 170/4, 170/4);
gl_setpalettecolor(GRAY, 48, 48, 48);
gl_setpalettecolor(LIGHTBLACK, 85/4, 85/4, 85/4);
gl_setpalettecolor(LIGHTBLUE, 85/4, 85/4, 255/4);
gl_setpalettecolor(LIGHTGREEN, 85/4, 255/4, 85/4);
gl_setpalettecolor(LIGHTCYAN, 85/4, 255/4, 255/4);
gl_setpalettecolor(LIGHTRED, 25/45/4, 85/4, 85/4);
gl_setpalettecolor(LIGHTMAGENTA, 255/4, 85/4, 255/4);
gl_setpalettecolor(LIGHTBROWN, 255/4, 255/4, 85/4);
#endif
active_console = 1;
return true;
}
void initscreen(void)
{
int vgamode;
vga_init();
vgamode = G640x480x16;
if (!vga_hasmode(vgamode)) {
printf("Mode not available.\n");
exit(-1);
}
vga_setmode(vgamode);
/* Create virtual screen. */
gl_setcontextvgavirtual(vgamode);
backscreen = gl_allocatecontext();
gl_getcontext(backscreen);
/* Physical screen context. */
vga_setmode(vgamode);
gl_setcontextvga(vgamode);
physicalscreen = gl_allocatecontext();
gl_getcontext(physicalscreen);
gl_setcontext(backscreen);
/*drawgraypalette(); */
gl_clearscreen(0);
// gl_setcontextvga(vgamode);
gl_enableclipping();
gl_setclippingwindow(0, 0, 639, 479);
gl_setwritemode(WRITEMODE_OVERWRITE | FONT_COMPRESSED);
gl_setfont(8, 8, gl_font8x8);
gl_setfontcolors(0, 1);
}
void demo3(void)
{
int x, y;
int targetx, targety;
int count, startclock;
GraphicsContext *virtualscreen;
GraphicsContext *physicalscreen;
/* Window coordinate initially at center. */
x = VWIDTH / 2 - WINWIDTH / 2;
y = VHEIGHT / 2 - WINHEIGHT / 2;
targetx = x;
targety = y;
virtualscreen = gl_allocatecontext();
gl_getcontext(virtualscreen);
gl_setcontextvga(G320x200x256);
physicalscreen = gl_allocatecontext();
gl_getcontext(physicalscreen);
gl_setcontext(virtualscreen);
count = 0;
startclock = clock();
for (;;) {
vga_waitretrace();
/* Copy window to screen. */
gl_copyboxtocontext(x, y, WINWIDTH, WINHEIGHT, physicalscreen,
0, 0);
if (x == targetx && y == targety) {
/* Create new target. */
targetx = rand() % (VWIDTH - WINWIDTH);
targety = rand() % (VHEIGHT - WINHEIGHT);
}
/* Move towards target. */
if (x < targetx)
x++;
if (x > targetx)
x--;
if (y < targety)
y++;
if (y > targety)
y--;
/* Boundary checks. */
if (x < 0)
x = 0;
if (x > VWIDTH - WINWIDTH)
x = VWIDTH - WINWIDTH;
if (y < 0)
y = 0;
if (y > VHEIGHT - WINHEIGHT)
y = VHEIGHT - WINHEIGHT;
if (vga_getkey())
break;
count++;
}
printf("Method 3: frame rate %ld\n", count * CLOCKS_PER_SEC
/ (clock() - startclock));
}
int main() {
int maxCols = 1024;
int maxRows = 768;
int maxIterations = 2048;
int maxSize = 4;
float Xmin = -2.0;
float Xmax = 1.2;
float Ymin = -1.2;
float Ymax = 1.2;
double X, Y;
double Xsquare, Ysquare;
double currentP;
double currentQ[767];
double deltaP, deltaQ;
int color;
int currentRow, currentCol;
deltaP = (Xmax - Xmin)/(double)maxCols;
deltaQ = (Ymax - Ymin)/(double)maxRows;
currentQ[0] = Ymax;
for (currentRow = 1; currentRow < maxRows; currentRow++) {
currentQ[currentRow] = currentQ[currentRow-1] - deltaQ;
}
currentP = Xmin;
vga_init();
vga_setmode(G1024x768x256);
gl_setcontextvga(G1024x768x256);
physicalscreen = gl_allocatecontext();
gl_getcontext(physicalscreen);
gl_setcontextvgavirtual(G1024x768x256);
virtualscreen = gl_allocatecontext();
gl_getcontext(virtualscreen);
gl_setcontext(virtualscreen);
for (currentCol = 0; currentCol < maxCols; currentCol++) {
for (currentRow = 0; currentRow < maxRows; currentRow++) {
X = 0.0;
Y = 0.0;
Xsquare = 0.0;
Ysquare = 0.0;
color = 0;
while ((color <= maxIterations) && (Xsquare + Ysquare <= maxSize)) {
Xsquare = X * X;
Ysquare = Y * Y;
Y = (2*X*Y) + currentQ[currentRow];
X = (Xsquare - Ysquare) + currentP;
color++;
}
gl_setpixel(currentCol, currentRow, color % 256);
}
currentP = currentP + deltaP;
gl_copyscreen(physicalscreen);
}
vga_getch();
gl_clearscreen(0);
vga_setmode(TEXT);
return 0;
}
void test(void)
{
int i, j;
unsigned char *bitmap;
GraphicsContext *savedcontext;
if (VIRTUAL)
gl_setcontext(backscreen);
gl_clearscreen(0);
for (i = 0; i < 5; i++) {
gl_clearscreen(0);
for (j = 0; j < 20000; j++)
gl_setpixel(random() % WIDTH, random() % HEIGHT,
random() % COLORS);
}
if (VIRTUAL)
gl_copyscreen(physicalscreen);
gl_clearscreen(0);
for (i = 0; i < 5000; i++) {
int x, y;
x = random() % (WIDTH - 1);
y = random() % (HEIGHT - 1);
gl_fillbox(x, y, random() % (WIDTH - x), random()
% (HEIGHT - y), random() % COLORS);
}
if (VIRTUAL)
gl_copyscreen(physicalscreen);
gl_clearscreen(0);
for (i = 0; i < 4000; i++)
gl_line(random() % WIDTH, random() % HEIGHT,
random() % WIDTH, random() % HEIGHT,
random() % COLORS);
if (VIRTUAL)
gl_copyscreen(physicalscreen);
/* Create bitmap. */
bitmap = malloc(64 * 64 * BYTESPERPIXEL);
/* Create temporary graphics context to create bitmap in. */
savedcontext = gl_allocatecontext();
gl_getcontext(savedcontext);
gl_setcontextvirtual(64, 64, BYTESPERPIXEL, BITSPERPIXEL, bitmap);
/* The rgb functions can be used to create nice bitmaps easily for */
/* hicolor/truecolor modes. The 256 color 'emulated' truecolor */
/* looks less impressive. */
for (i = 0; i < 32; i++)
for (j = 0; j < 32; j++) {
int c;
c = 255 - (i + j) * 4;
gl_setpixelrgb(31 - i, 31 - j, c, 0, 0);
gl_setpixelrgb(32 + i, 31 - j, c, c, 0);
gl_setpixelrgb(31 - i, 32 + j, c, 0, c);
gl_setpixelrgb(32 + i, 32 + j, c, c, c);
}
/* Restore previous context. */
gl_setcontext(savedcontext);
gl_clearscreen(0);
for (i = 0; i < 4000; i++) {
int x, y;
x = random() % (WIDTH - 64 + 1);
y = random() % (HEIGHT - 64 + 1);
gl_putbox(x, y, 64, 64, bitmap);
}
free(bitmap);
if (VIRTUAL)
gl_copyscreen(physicalscreen);
}