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#include <stdio.h>
#include <stdbool.h>
#include <inttypes.h>
#include <time.h>
#include <GLES3/gl3.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdnoreturn.h>
#include "otd.h"
#include "drm.h"
#include "event.h"
// I know this is pretty crappy,
// but it's just for the example's sake
struct {
char *name;
char *mode;
} displays[8];
int num_displays = 0;
noreturn void usage(const char *name, int ret)
{
fprintf(stderr, "usage: %s [-o <name> [-m <mode>]]*\n"
"\n"
" -h \tDisplay this help text\n"
" -o <name>\tWhich diplay to use. e.g. DVI-I-1.\n"
" -m <mode>\tWhich mode to use. It must come after an -o option.\n"
" \tMust be either 'preferred', 'current', widthxheight\n"
" \tor widthxheight@rate. Defaults to 'preferred'.\n"
"\n"
"example: %s -o DVI-I-1 -m 1920x1080@60 -o DP-1 -m 1920x1200\n",
name, name);
exit(ret);
}
void parse_args(int argc, char *argv[])
{
int c;
int i = -1;
while ((c = getopt(argc, argv, "ho:m:")) != -1) {
switch (c) {
case 'h':
usage(argv[0], 0);
case 'o':
i = num_displays++;
if (num_displays == 8) {
fprintf(stderr, "Too many displays\n");
exit(1);
}
displays[i].name = strdup(optarg);
break;
case 'm':
if (i == -1) {
fprintf(stderr, "A display is required first\n");
exit(1);
}
fprintf(stderr, "Assigned '%s' to '%s'\n", optarg, displays[i].name);
displays[i].mode = optarg;
i = -1;
break;
default:
usage(argv[0], 1);
}
}
// Trailing args
if (optind != argc) {
usage(argv[0], 1);
}
}
int main(int argc, char *argv[])
{
parse_args(argc, argv);
struct otd *otd = otd_start();
if (!otd)
return 1;
float colour[3] = {1.0, 0.0, 0.0};
int dec = 0;
struct timespec start, now;
clock_gettime(CLOCK_MONOTONIC, &start);
struct timespec last = start;
while (clock_gettime(CLOCK_MONOTONIC, &now) == 0 &&
now.tv_sec < start.tv_sec + 10) {
struct otd_event ev;
if (!otd_get_event(otd, &ev))
continue;
struct otd_display *disp = ev.display;
switch (ev.type) {
case OTD_EV_RENDER:
rendering_begin(disp);
// This is all just calculating the colours.
// It's not particularly important.
long ms = (now.tv_sec - last.tv_sec) * 1000 +
(now.tv_nsec - last.tv_nsec) / 1000000;
int inc = (dec + 1) % 3;
colour[dec] -= ms / 2000.0f;
colour[inc] += ms / 2000.0f;
if (colour[dec] < 0.0f) {
colour[dec] = 0.0f;
colour[inc] = 1.0f;
dec = (dec + 1) % 3;
}
last = now;
glViewport(0, 0, disp->width, disp->height);
glClearColor(colour[0], colour[1], colour[2], 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
rendering_end(disp);
break;
case OTD_EV_DISPLAY_REM:
printf("%s removed\n", disp->name);
break;
case OTD_EV_DISPLAY_ADD:
printf("%s added\n", disp->name);
const char *mode = NULL;
for (int i = 0; i < num_displays; ++i) {
if (strcmp(disp->name, displays[i].name) == 0) {
mode = displays[i].mode;
}
}
if (!mode)
mode = "preferred";
if (!modeset_str(otd, ev.display, mode)) {
fprintf(stderr, "Modesetting %s failed\n", disp->name);
goto out;
}
break;
default:
break;
}
}
out:
otd_finish(otd);
}
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