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#include <yasl/app.h>
#include <stdio.h>
#include <string.h>
static bool failed, smoke_test;
static int mouse_x = -1;
static int mouse_y = -1;
static bool mouse_down = false;
static int color_theme = 0;
static uint16_t pen_pressure = 0;
static int8_t pen_tilt_x = 0;
static int8_t pen_tilt_y = 0;
static enum yasl_pointer_device pointer_device = YASL_PTR_DEV_MOUSE;
static const char *device_name(enum yasl_pointer_device dev)
{
switch (dev) {
case YASL_PTR_DEV_PEN: return "Pen/Stylus";
case YASL_PTR_DEV_ERASER: return "Eraser";
case YASL_PTR_DEV_TOUCH: return "Touch";
default: return "Mouse";
}
}
static void on_draw(void *ud, struct yasl_surface *s, struct yasl_frame_context *frame)
{
(void)ud;
int w = frame->size.x;
int h = frame->size.y;
uint32_t *pixels = frame->cpu.pixels;
if (!pixels || w <= 0 || h <= 0)
return;
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++) {
uint8_t r, g, b;
uint8_t u = (uint8_t)((x * 255) / (w > 0 ? w : 1));
uint8_t v = (uint8_t)((y * 255) / (h > 0 ? h : 1));
switch (color_theme % 3) {
case 0:
r = u;
g = v;
b = 160;
break;
case 1:
r = 40;
g = u;
b = v;
break;
default:
r = v;
g = 60;
b = u;
break;
}
/* Draw interactive pointer / stylus indicator */
if (mouse_x >= 0 && mouse_y >= 0) {
int dx = x - mouse_x;
int dy = y - mouse_y;
int dist_sq = dx * dx + dy * dy;
/* Pressure-sensitive radius: scales dynamically from 8px to 64px */
int radius;
if (pen_pressure > 0) {
radius = 8 + (int)(((uint32_t)pen_pressure * 56) / 65535);
} else {
radius = mouse_down ? 36 : 18;
}
if (dist_sq < radius * radius) {
r = (uint8_t)(255 - r / 2);
g = (uint8_t)(255 - g / 2);
b = (uint8_t)(255 - b / 2);
}
}
pixels[y * w + x] = (255u << 24) | ((uint32_t)r << 16) | ((uint32_t)g << 8) | b;
}
}
if (!yasl_frame_present_cpu(frame, NULL, 0)) {
fprintf(stderr, "Failed to present frame\n");
failed = true;
}
if (failed || smoke_test) yasl_surface_destroy(s);
}
static enum yasl_app_result on_init(void *ud, struct yasl_display *display)
{
(void)ud;
struct yasl_window_spec window_spec = {
.title = "YASL Interactive Window (Pen & Touch Enabled)",
.size = { .x = 640, .y = 480 },
};
struct yasl_surface *s = yasl_surface_create_toplevel(display, &window_spec);
if (!s) {
fprintf(stderr, "Failed to create surface\n");
failed = true;
return YASL_APP_QUIT;
}
yasl_surface_request_frame(s);
printf("=== YASL Demo Running ===\n");
printf(" - Stylus/Pen: full pressure (0..65535) and tilt detection\n");
printf(" - Mouse/Touch: interactive click/motion highlights\n");
printf(" - Space: cycle background themes\n");
printf(" - Escape: exit\n\n");
return YASL_APP_CONTINUE;
}
static void pointer_sample(struct yasl_vector2i pos, enum yasl_pointer_device device,
struct yasl_pointer_pen pen)
{
mouse_x = pos.x;
mouse_y = pos.y;
pointer_device = device;
pen_pressure = pen.pressure;
pen_tilt_x = pen.tilt_x;
pen_tilt_y = pen.tilt_y;
}
static enum yasl_app_result on_event(void *ud, const struct yasl_event *ev)
{
(void)ud;
switch (ev->type) {
case YASL_EVENT_WINDOW_CLOSE:
return YASL_APP_QUIT;
case YASL_EVENT_WINDOW_RESIZE: {
uint32_t flags = yasl_surface_state(ev->surface);
const char *mode = flags & YASL_STATE_FULLSCREEN ? "fullscreen" :
flags & YASL_STATE_MAXIMIZED ? "maximized" :
flags & YASL_STATE_TILED ? "tiled" : "windowed";
printf("[YASL] Resized to %dx%d (scale: %.2fx, %s)\n", ev->resize.geometry.size.x,
ev->resize.geometry.size.y, (double)ev->resize.geometry.scale_120 / YASL_SCALE_UNIT, mode);
break;
}
case YASL_EVENT_KEY:
if (ev->key.action != YASL_KEY_PRESS) return YASL_APP_CONTINUE;
if (ev->key.key == YASL_KEY_ESCAPE) return YASL_APP_QUIT;
if (ev->key.key == YASL_KEY_SPACE || ev->key.key == YASL_KEY_ENTER)
color_theme++;
break;
case YASL_EVENT_POINTER_DOWN:
case YASL_EVENT_POINTER_UP:
case YASL_EVENT_POINTER_MOTION:
pointer_sample(ev->pointer.pos, ev->pointer.device, ev->pointer.pen);
if (ev->type == YASL_EVENT_POINTER_DOWN && ev->pointer.button == YASL_BUTTON_PRIMARY) {
mouse_down = true;
} else if (ev->type == YASL_EVENT_POINTER_UP && ev->pointer.button == YASL_BUTTON_PRIMARY) {
mouse_down = false;
pen_pressure = 0;
}
break;
case YASL_EVENT_FOCUS:
if (ev->focus.focused) return YASL_APP_CONTINUE;
/* Fall through to cancel held input on focus loss. */
[[fallthrough]];
case YASL_EVENT_INPUT_RESET:
case YASL_EVENT_POINTER_LEAVE:
mouse_x = mouse_y = -1;
mouse_down = false;
pen_pressure = 0;
break;
default:
return YASL_APP_CONTINUE;
}
if (pen_pressure > 0) {
printf("[Pen] Pressure: %5u/65535 (%.1f%%) | Tilt: (%+3d°, %+3d°) | Device: %s\n",
pen_pressure, pen_pressure * 100.0 / 65535.0,
pen_tilt_x, pen_tilt_y, device_name(pointer_device));
}
yasl_surface_request_frame(ev->surface);
return YASL_APP_CONTINUE;
}
int main(int argc, char **argv)
{
if (argc == 2 && strcmp(argv[1], "--smoke-test") == 0)
smoke_test = true;
else if (argc != 1) {
fprintf(stderr, "Usage: %s [--smoke-test]\n", argv[0]);
return 1;
}
struct yasl_app_desc desc = {
.app_id = "org.yasl.example",
.init = on_init,
.event = on_event,
.frame = on_draw,
};
int result = yasl_run(&desc);
if (result) perror("yasl_run");
return result || failed ? 1 : 0;
}
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