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/* GPU example: the application owns context binding, drawing and swap pacing. */
#include <yasl/yasl.h>
#include <errno.h>
#include <math.h>
#include <stdio.h>
#include <string.h>
typedef void (*clear_color_fn)(float, float, float, float);
typedef void (*clear_fn)(unsigned);
typedef void (*viewport_fn)(int, int, int, int);
int main(int argc, char **argv)
{
bool smoke = argc == 2 && !strcmp(argv[1], "--smoke-test");
yasl_surface *s = yasl_surface_create(&(struct yasl_surface_options){
.title = "YASL OpenGL", .width = 800, .height = 600, .type = YASL_SURFACE_GL});
if (!s || yasl_gl_make_current(s) < 0) {
fprintf(stderr, "%s\n", strerror(errno));
yasl_shutdown();
return 1;
}
clear_color_fn clear_color = (clear_color_fn)yasl_gl_get_proc_address("glClearColor");
clear_fn clear = (clear_fn)yasl_gl_get_proc_address("glClear");
viewport_fn viewport = (viewport_fn)yasl_gl_get_proc_address("glViewport");
if (!clear_color || !clear || !viewport) {
yasl_shutdown();
return 1;
}
yasl_gl_set_swap_interval(s, 1);
int result = 0, frames = 0;
bool online = true;
for (bool running = true; running;) {
/* Drain events before each frame; while the display is gone, block until it returns. */
yasl_event e;
int n = yasl_wait_event(&e, online ? 0 : -1);
if (n < 0) {
result = 1;
break;
}
if (e.type == YASL_EVENT_CLOSE || e.type == YASL_EVENT_QUIT ||
(e.type == YASL_EVENT_KEY && e.key.key == YASL_KEY_ESCAPE))
running = false;
if (e.type == YASL_EVENT_DISPLAY_LOST) {
yasl_gl_make_current(NULL);
online = false;
}
if (e.type == YASL_EVENT_DISPLAY_RESTORED) {
/* The context is new: bind it again and restore GL state here. */
online = yasl_gl_make_current(s) == 0 && yasl_gl_set_swap_interval(s, 1) == 0;
}
if (n > 0 || !online || !running)
continue;
struct yasl_surface_info info = yasl_surface_get_info(s);
viewport(0, 0, info.pixel_width, info.pixel_height);
double t = yasl_time_ns() / 1e9;
clear_color((float)(0.3 + 0.2 * sin(t)), 0.2f, 0.4f, 1);
clear(0x00004000u);
if (yasl_gl_present(s) < 0) {
result = 1;
break;
}
if (smoke && ++frames == 3)
break;
}
yasl_gl_make_current(NULL);
yasl_shutdown();
return result;
}
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