1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/doorbell-client/src/main.c	Tue Mar 15 08:35:21 2016 +0200
     1.3 @@ -0,0 +1,216 @@
     1.4 +#include <stdio.h>
     1.5 +#include <stdlib.h>
     1.6 +#include <string.h>
     1.7 +#include <errno.h>
     1.8 +#include <unistd.h>
     1.9 +#include <fcntl.h>
    1.10 +#include <sys/select.h>
    1.11 +#include <sys/socket.h>
    1.12 +#include <arpa/inet.h>
    1.13 +#include <netdb.h>
    1.14 +#include <GL/glut.h>
    1.15 +#include <GL/freeglut_ext.h>
    1.16 +#include <GL/glx.h>
    1.17 +
    1.18 +struct video_block_header {
    1.19 +	unsigned int magic;
    1.20 +	int frame;
    1.21 +	int x, y;
    1.22 +	int width, height;
    1.23 +	int frame_width, frame_height;
    1.24 +};
    1.25 +
    1.26 +int conn(const char *host, int port);
    1.27 +void display(void);
    1.28 +void reshape(int x, int y);
    1.29 +void keyb(unsigned char key, int x, int y);
    1.30 +int handle_conn(int s);
    1.31 +void post_redisplay(void);
    1.32 +
    1.33 +int quit;
    1.34 +int srvsock;
    1.35 +const char *address = "localhost";
    1.36 +int port = 2828;
    1.37 +unsigned int tex, tex_width, tex_height;
    1.38 +int redraw_pending;
    1.39 +
    1.40 +int main(int argc, char **argv)
    1.41 +{
    1.42 +	Display *dpy;
    1.43 +	int xsock;
    1.44 +
    1.45 +	glutInit(&argc, argv);
    1.46 +	glutInitWindowSize(800, 600);
    1.47 +	glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
    1.48 +	glutCreateWindow("doorbell");
    1.49 +
    1.50 +	glutDisplayFunc(display);
    1.51 +	glutReshapeFunc(reshape);
    1.52 +	glutKeyboardFunc(keyb);
    1.53 +
    1.54 +	dpy = glXGetCurrentDisplay();
    1.55 +	xsock = ConnectionNumber(dpy);
    1.56 +
    1.57 +	if((srvsock = conn(address, port)) == -1) {
    1.58 +		return 1;
    1.59 +	}
    1.60 +	write(srvsock, "hello", 5);
    1.61 +
    1.62 +	glGenTextures(1, &tex);
    1.63 +	glBindTexture(GL_TEXTURE_2D, tex);
    1.64 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    1.65 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    1.66 +
    1.67 +	for(;;) {
    1.68 +		int res;
    1.69 +		int maxfd = srvsock > xsock ? srvsock : xsock;
    1.70 +		struct timeval tv0 = {0, 0};
    1.71 +		fd_set rdset;
    1.72 +
    1.73 +		FD_ZERO(&rdset);
    1.74 +		FD_SET(xsock, &rdset);
    1.75 +		FD_SET(srvsock, &rdset);
    1.76 +
    1.77 +		while((res = select(maxfd + 1, &rdset, 0, 0, redraw_pending ? &tv0 : 0) == -1) && errno == EINTR);
    1.78 +		if(res == -1) break;
    1.79 +
    1.80 +		if(redraw_pending || FD_ISSET(xsock, &rdset)) {
    1.81 +			glutMainLoopEvent();
    1.82 +			if(quit) {
    1.83 +				break;
    1.84 +			}
    1.85 +		}
    1.86 +		if(FD_ISSET(srvsock, &rdset)) {
    1.87 +			if(handle_conn(srvsock) == -1) {
    1.88 +				break;
    1.89 +			}
    1.90 +		}
    1.91 +	}
    1.92 +
    1.93 +	close(srvsock);
    1.94 +	return 0;
    1.95 +}
    1.96 +
    1.97 +
    1.98 +int conn(const char *hostname, int port)
    1.99 +{
   1.100 +	int s;
   1.101 +	struct sockaddr_in addr;
   1.102 +	struct hostent *host;
   1.103 +
   1.104 +	if((s = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
   1.105 +		fprintf(stderr, "failed to create socket\n");
   1.106 +		return -1;
   1.107 +	}
   1.108 +
   1.109 +	if(!(host = gethostbyname(hostname))) {
   1.110 +		fprintf(stderr, "failed to resolve hostname: %s\n", hostname);
   1.111 +		return -1;
   1.112 +	}
   1.113 +
   1.114 +	memset(&addr, 0, sizeof addr);
   1.115 +	addr.sin_family = AF_INET;
   1.116 +	addr.sin_port = htons(port);
   1.117 +	addr.sin_addr = *(struct in_addr*)host->h_addr;
   1.118 +
   1.119 +	printf("connecting to %s (%s), port %d\n", hostname, inet_ntoa(addr.sin_addr), port);
   1.120 +	if(connect(s, (struct sockaddr*)&addr, sizeof addr) == -1) {
   1.121 +		fprintf(stderr, "failed to connect\n");
   1.122 +		return -1;
   1.123 +	}
   1.124 +
   1.125 +	fcntl(s, F_SETFL, fcntl(s, F_GETFL) | O_NONBLOCK);
   1.126 +	return s;
   1.127 +}
   1.128 +
   1.129 +void display(void)
   1.130 +{
   1.131 +	redraw_pending = 0;
   1.132 +
   1.133 +	glClear(GL_COLOR_BUFFER_BIT);
   1.134 +
   1.135 +	glMatrixMode(GL_MODELVIEW);
   1.136 +	glLoadIdentity();
   1.137 +
   1.138 +	glPushMatrix();
   1.139 +	glScalef(0.75, 0.75, 0.75);
   1.140 +
   1.141 +	glBindTexture(GL_TEXTURE_2D, tex);
   1.142 +	glEnable(GL_TEXTURE_2D);
   1.143 +
   1.144 +	glBegin(GL_QUADS);
   1.145 +	glTexCoord2f(0, 0); glVertex2f(-1, -1);
   1.146 +	glTexCoord2f(1, 0); glVertex2f(1, -1);
   1.147 +	glTexCoord2f(1, 1); glVertex2f(1, 1);
   1.148 +	glTexCoord2f(0, 1); glVertex2f(-1, 1);
   1.149 +	glEnd();
   1.150 +
   1.151 +	glDisable(GL_TEXTURE_2D);
   1.152 +	glPopMatrix();
   1.153 +
   1.154 +	glutSwapBuffers();
   1.155 +}
   1.156 +
   1.157 +void reshape(int x, int y)
   1.158 +{
   1.159 +	glViewport(0, 0, x, y);
   1.160 +	glMatrixMode(GL_PROJECTION);
   1.161 +	glLoadIdentity();
   1.162 +}
   1.163 +
   1.164 +void keyb(unsigned char key, int x, int y)
   1.165 +{
   1.166 +	switch(key) {
   1.167 +	case 27:
   1.168 +		quit = 1;
   1.169 +		break;
   1.170 +	}
   1.171 +}
   1.172 +
   1.173 +int handle_conn(int s)
   1.174 +{
   1.175 +	static int cur_frame;
   1.176 +	struct video_block_header hdr;
   1.177 +	int size;
   1.178 +	unsigned char *pixels;
   1.179 +
   1.180 +	if(read(s, &hdr, sizeof hdr) != sizeof hdr) {
   1.181 +		fprintf(stderr, "failed to read video block header\n");
   1.182 +		return -1;
   1.183 +	}
   1.184 +	if(hdr.frame < cur_frame) {
   1.185 +		printf("skipping old frame %d\n", hdr.frame);
   1.186 +	}
   1.187 +	cur_frame = hdr.frame;
   1.188 +	printf("updating block %dx%d%+d%+d in frame %d\n", hdr.width, hdr.height, hdr.x, hdr.y, hdr.frame);
   1.189 +
   1.190 +	size = hdr.width * hdr.height * 2;
   1.191 +	if(!(pixels = malloc(size))) {
   1.192 +		fprintf(stderr, "failed to allocate pixel block %dx%d\n", hdr.width, hdr.height);
   1.193 +		return -1;
   1.194 +	}
   1.195 +	if(read(s, pixels, size) != size) {
   1.196 +		fprintf(stderr, "failed to read pixel block\n");
   1.197 +		return -1;
   1.198 +	}
   1.199 +
   1.200 +	glBindTexture(GL_TEXTURE_2D, tex);
   1.201 +
   1.202 +	if(tex_width < hdr.frame_width || tex_height < hdr.frame_height) {
   1.203 +		tex_width = hdr.frame_width;
   1.204 +		tex_height = hdr.frame_height;
   1.205 +		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, tex_width, tex_height, 0,
   1.206 +				GL_RGB, GL_UNSIGNED_SHORT_5_6_5, 0);
   1.207 +	}
   1.208 +	glTexSubImage2D(GL_TEXTURE_2D, 0, hdr.x, hdr.y, hdr.width, hdr.height,
   1.209 +			GL_RGB, GL_UNSIGNED_SHORT_5_6_5, pixels);
   1.210 +
   1.211 +	post_redisplay();
   1.212 +	return 0;
   1.213 +}
   1.214 +
   1.215 +void post_redisplay(void)
   1.216 +{
   1.217 +	glutPostRedisplay();
   1.218 +	redraw_pending = 1;
   1.219 +}