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/*
the REAL donut.c
compile with -lm, -lX11
Copyright (c) 2023 turret. <turret@turret.cyou>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <math.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xos.h>
#include <X11/extensions/Xdbe.h>
char *argv0;
#include "arg.h"
#define BETWEEN(x, min, max) min < x && x< max
const float theta_spacing = 0.07;
const float phi_spacing = 0.02;
int height = 24;
int width = 80;
double utime(){
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec * 1000 + tv.tv_usec / 1000;
}
void drawTorus (float *b, const float *Az, const float *Bz) {
float A = *Az;
float B = *Bz;
float *z = malloc(width * height * sizeof(float));//[width * height];
memset(z, 0, width * height * sizeof(float) / sizeof(char)); // clear z-buffer
// render torus
float sinA = sin(A);
float sinB = sin(B);
float cosA = cos(A);
float cosB = cos(B);
for (float theta = 0; 2*M_PI > theta; theta += theta_spacing) {
float sinTheta = sin(theta);
float cosTheta = cos(theta);
float h = cosTheta + 2;
for (float phi = 0; 2*M_PI > phi; phi += phi_spacing) {
float sinPhi = sin(phi);
float cosPhi = cos(phi);
float depth = 1 / (sinPhi * h * sinA + sinTheta * cosA + 5);
float t = sinPhi * h * cosA - sinTheta * sinA;
int x = width/2 + (30 * width / 80) * depth * (cosPhi * h * cosB - t * sinB);
int y = height/2 + (15 * height / 24) * depth * (cosPhi * h * sinB + t * cosB);
int index = x + width * y;
float lum = ((sinTheta * sinA - sinPhi * cosTheta * cosA) * cosB - sinPhi * cosTheta * sinA - sinTheta * cosA - cosPhi * cosTheta * sinB);
if (BETWEEN(y, 0, height - 2) && BETWEEN(x, 0, width) && depth > z[index]) { //22 > y && y > 0 && x > 0 && 80 > x && D > z[o]) {
z[index] = depth;
b[index] = lum + 1;
}
}
}
free(z);
}
void usage() {
fprintf(stderr, "usage: %s [-h] [-s scale] [-r speed]\n", argv0);
exit(1);
}
int main(int argc, char **argv) {
/*#define SCALE 2
#define ROTATION_SPEED_FACTOR 1*/
int SCALE = 2;
int ROTATION_SPEED_FACTOR = 1;
ARGBEGIN {
case 's':
SCALE = atoi(EARGF(usage()));
break;
case 'r':
ROTATION_SPEED_FACTOR = atoi(EARGF(usage()));
break;
case 'h':
usage();
break;
default:
break;
} ARGEND
Display *dis = XOpenDisplay((char*)0);
int screen = DefaultScreen(dis);
unsigned long black = BlackPixel(dis, screen), white = WhitePixel(dis, screen);
Window win = XCreateSimpleWindow(dis, DefaultRootWindow(dis), 0, 0, 640, 480, 5, white, black);
XSetStandardProperties(dis, win, "DOnut!", "donut", None, NULL, 0, NULL);
XSelectInput(dis, win, ExposureMask);
GC gc = XCreateGC(dis, win, 0, 0);
XSetBackground(dis, gc, white);
XSetForeground(dis, gc, black);
XClearWindow(dis, win);
XMapRaised(dis, win);
XdbeSwapInfo swap_info = {
win,
XdbeUndefined
};
XdbeBackBuffer back_buffer = XdbeAllocateBackBufferName(dis, win, swap_info.swap_action);
// torus rotation floats
float A = 0; // x-axis
float B = 0; // z-axis
while(1){
double stime = utime();
XSync(dis, 1);
XWindowAttributes attr;
XGetWindowAttributes(dis, win, &attr);
width = attr.width / SCALE;
height = attr.height / SCALE;
float *b = malloc(width * height * sizeof(float));
memset(b, 0, width * height * sizeof(float) / sizeof(char));
drawTorus(b, &A, &B);
// old ascii console generation code. kept for presevation sakes
//#define LUMINANCE_SET " .,-~:;=!*#$@"
//printf("\x1b[H");
//for (int k = 0; width * height >= k; k++){
// putchar(k % width ? (b[k] > 0 ? LUMINANCE_SET[(int)MAX((b[k] - 1) * 8, 0)] : ' ') : 10);
//}
for(int x = 0; width >= x; x++){
for(int y = 0; height >= y; y++){
int color = (b[x + width * y] - 1 + M_SQRT2) / sqrt(8) * 255;
XSetForeground(dis, gc, color << 16 | color << 8 | color);
XFillRectangle(dis, back_buffer, gc, x * SCALE, y * SCALE, SCALE, SCALE);
}
}
XdbeSwapBuffers(dis, &swap_info, 1);
free(b);
XSync(dis, 1);
double etime = utime();
if(etime < stime + 1000/FPS_MAX)
usleep((1000/FPS_MAX - (etime - stime)) * 1000);
double rtime = utime();
A += (rtime-stime) * (0.04f * ROTATION_SPEED_FACTOR) / (1000/FPS_MAX);// / (1000/FPS_MAX), 0.04f * ROTATION_SPEED_FACTOR);
B += (rtime-stime) * (0.02f * ROTATION_SPEED_FACTOR) / (1000/FPS_MAX);// / (1000/FPS_MAX), 0.04f * ROTATION_SPEED_FACTOR);
printf("fps: %.1f \r", 1000/(rtime-stime));
}
}
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