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/* GPU example: the application owns context binding, drawing and swap pacing. */
#include <yasl/yasl.h>
#include <yasl/gl.h>
#include <stdio.h>
#include <math.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_gl_surface_create(&(struct yasl_surface_options){.title="YASL OpenGL", .width=800, .height=600, .type=YASL_SURFACE_NATIVE, .flags=0}, NULL);
if (!s || (yasl_gl_make_current(s) < 0)) {
const char *error;
error = strerror(errno);
fprintf(stderr, "%s\n", error);
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) 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;
int w, h;
yasl_surface_get_framebuffer_size(s, &w, &h);
viewport(0, 0, w, h);
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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