int GGI_vgagl_drawpixel(struct ggi_visual *vis, int x, int y)
{
CHECKXY(vis, x, y);
gl_setpixel(x, y, LIBGGI_GC_FGCOLOR(vis));
return 0;
}
int GGI_vgagl_putpixel(struct ggi_visual *vis, int x, int y, ggi_pixel col)
{
CHECKXY(vis, x, y);
gl_setpixel(x, y, col);
return 0;
}
void glfx_pattern4(UNS_32 *offset, const INT_8 *sintable, UNS_16 sinlen)
{
UNS_16 x,y;
for (x=0;x<GL_XSIZE*GL_XBOARD;x++)
for (y=0;y<GL_YSIZE*GL_YBOARD;y++) {
gl_point p = {x,y};
gl_col c = {4*abs(sintable[(*offset+y)%sinlen]), 1*abs(sintable[(*offset+y)%sinlen])};
gl_setpixel(&p,&c);
}
}
int GGI_vgagl_putpixel_nc(struct ggi_visual *vis, int x, int y, ggi_pixel col)
{
gl_setpixel(x, y, col);
return 0;
}
int GGI_vgagl_drawpixel_nc(struct ggi_visual *vis, int x, int y)
{
gl_setpixel(x, y, LIBGGI_GC_FGCOLOR(vis));
return 0;
}
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);
}
