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#include <stdlib.h>
#include <stdio.h>
#include <vga.h>
#include <vgagl.h>
/* The logo was drawn by John Remyn. */
/* Feel free to provide a more beautiful/official/thought provoking/cool */
/* logo to replace it. */
#define LOGOWIDTH 201
#define LOGOHEIGHT 85
int VGAMODE;
int VIRTUAL;
GraphicsContext *backscreen;
GraphicsContext *physicalscreen;
void *logobitmap;
void loadbitmap(char *filename, void *buf)
{
FILE *f;
f = fopen(filename, "rb");
if(f==NULL)return;
fread(buf, 1, 17085, f);
fclose(f);
}
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);
}
void setcustompalette(void)
{
/* colors 0-31 are an RGB mix (bits 0 and 1 red, 2 green, 3 and 4 blue) */
/* 32-63 black to red */
/* 64-95 black to green */
/* 96-127 black to yellow */
/* 128-159 black to blue */
/* 160-191 black to magenta */
/* 192-223 black to cyan */
/* 224-255 black to white */
Palette pal;
int i;
for (i = 0; i < 256; i++) {
int r, g, b;
r = g = b = 0;
if ((i & 32) > 0)
r = (i & 31) << 1;
if ((i & 64) > 0)
g = (i & 31) << 1;
if ((i & 128) > 0)
b = (i & 31) << 1;
if (i < 32) {
r = (i & 3) << 4; /* 2 bits */
g = (i & 4) << 3; /* 1 bit */
b = (i & 24) << 1; /* 2 bits */
}
pal.color[i].red = r;
pal.color[i].green = g;
pal.color[i].blue = b;
}
gl_setpalette(&pal);
}
void logotest(void)
{
int h;
void *scaled;
/* Set logo palette. */
setcustompalette();
/* Create logo bitmap */
logobitmap = alloca(LOGOWIDTH * LOGOHEIGHT);
loadbitmap("linuxlogo.bmp", logobitmap);
/* Allocate buffer for scaled bitmap. */
scaled = alloca(WIDTH * HEIGHT);
gl_clearscreen(0);
/* Stretch vertically. */
for (h = 0; h <= LOGOHEIGHT; h++) {
gl_scalebox(LOGOWIDTH, LOGOHEIGHT, logobitmap,
LOGOWIDTH, h, scaled);
gl_putbox(0, 0, LOGOWIDTH, h, scaled);
if (VIRTUAL)
gl_copyscreen(physicalscreen);
}
gl_clearscreen(0);
/* Scale to screen resolution. */
gl_scalebox(LOGOWIDTH, LOGOHEIGHT, logobitmap, WIDTH, HEIGHT, scaled);
gl_putbox(0, 0, WIDTH, HEIGHT, scaled);
gl_copyscreen(physicalscreen);
}
void main(void)
{
vga_init();
VGAMODE = vga_getdefaultmode();
if (VGAMODE == -1)
VGAMODE = G320x200x256; /* Default mode. */
if (!vga_hasmode(VGAMODE)) {
printf("Mode not available.\n");
exit(-1);
}
VIRTUAL = 0; /* No virtual screen. */
if (vga_getmodeinfo(VGAMODE)->colors == 16 ||
(vga_getmodeinfo(VGAMODE)->flags & IS_MODEX))
/* These modes are supported indirectly by vgagl. */
VIRTUAL = 1;
if (VIRTUAL) {
/* Create virtual screen. */
gl_setcontextvgavirtual(VGAMODE);
backscreen = gl_allocatecontext();
gl_getcontext(backscreen);
}
vga_setmode(VGAMODE);
gl_setcontextvga(VGAMODE); /* Physical screen context. */
physicalscreen = gl_allocatecontext();
gl_getcontext(physicalscreen);
if (COLORS == 256)
gl_setrgbpalette();
test();
/* Now do the same with clipping enabled. */
gl_clearscreen(0);
gl_setclippingwindow(WIDTH / 4, HEIGHT / 4, WIDTH - WIDTH / 4 - 1,
HEIGHT - HEIGHT / 4 - 1);
test();
gl_disableclipping();
if (COLORS == 256)
/* Show the logo if using 256 color mode. */
logotest();
getchar();
if (VIRTUAL)
gl_freecontext(backscreen);
vga_setmode(TEXT);
exit(0);
}
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