Simplify the public event and CPU API

Applications now need far less ceremony: hello.c is a 20-line loop that
handles REFRESH, CLOSE and QUIT and draws into the surface's own pixels.

- Fold GEOMETRY, STATE and FOCUS into one WINDOW event carrying size,
  scale and state; unchanged values send nothing.
- Guarantee REFRESH once a window has a size and after every resize,
  never at size zero.
- Merge DROP_HOVER into DROP with over/leave/data actions and give drag
  and drop actions enums.
- Keep event strings valid until the next wait and drop
  yasl_event_release; empty or failed waits report NONE.
- Replace copy-in presentation with a lent pixel buffer:
  yasl_cpu_pixels and yasl_cpu_present.
- Remove yasl_poll_event, yasl_cpu_read_pixels, unused event fields and
  comments that restated names.
- Wayland: resize floating windows in request_size instead of reporting
  it unsupported, and stop marking new GPU surfaces as Vulkan so
  yasl_vulkan_create_surface no longer fails with NATIVE_WINDOW_IN_USE.

Also includes the in-progress public API refactor that was uncommitted
in the tree (removal of the app/loop layer, new surface, GL and Vulkan
entry points).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/include/yasl/gl.h b/include/yasl/gl.h
new file mode 100644
index 0000000..66a245a
--- /dev/null
+++ b/include/yasl/gl.h
@@ -0,0 +1,27 @@
+/** @file Optional OpenGL/OpenGL ES contexts. Attribute lists are per-call. */
+#ifndef YASL_GL_H
+#define YASL_GL_H
+#include "yasl/yasl.h"
+#ifdef __cplusplus
+extern "C" {
+#endif
+enum yasl_gl_attribute { YASL_GL_END, YASL_GL_MAJOR, YASL_GL_MINOR, YASL_GL_PROFILE, YASL_GL_DEBUG,
+    YASL_GL_FORWARD_COMPAT, YASL_GL_RED_BITS, YASL_GL_GREEN_BITS, YASL_GL_BLUE_BITS, YASL_GL_ALPHA_BITS,
+    YASL_GL_DEPTH_BITS, YASL_GL_STENCIL_BITS, YASL_GL_SAMPLES, YASL_GL_SRGB, YASL_GL_API };
+enum yasl_gl_profile { YASL_GL_ANY, YASL_GL_CORE, YASL_GL_COMPATIBILITY };
+enum yasl_gl_api { YASL_GL_OPENGL, YASL_GL_OPENGL_ES };
+typedef void (*yasl_gl_proc)(void);
+/** key/value pairs terminated by END, NULL defaults to GL3.2 core RGBA8 D24 S8.
+ * share is a live GL surface or NULL. CPU flag is invalid. Context is owned by
+ * the returned surface. Detach it from all rendering threads before destruction. */
+YASL_API yasl_surface *yasl_gl_surface_create(const char *title, int width, int height,
+    unsigned flags, const int *attributes, yasl_surface *share);
+/** May run on a rendering thread. NULL detaches this thread's current context. */
+YASL_API bool yasl_gl_make_current(yasl_surface *surface);
+YASL_API yasl_gl_proc yasl_gl_get_proc_address(const char *name);
+YASL_API bool yasl_gl_swap_interval(yasl_surface *surface, int interval);
+YASL_API bool yasl_gl_swap_buffers(yasl_surface *surface);
+#ifdef __cplusplus
+}
+#endif
+#endif