feat: WASM build for browser replay

CMakeLists.txt

@@ -12,6 +12,7 @@ set(MAVLINK_DIR ${CMAKE_SOURCE_DIR}/lib/c_library_v2)
 add_library(hawkeye-core STATIC
     src/ulog_parser.c
     src/ulog_replay.c
+    src/ulog_replay_apply.c
     src/data_source_ulog.c
 )
 target_include_directories(hawkeye-core PUBLIC src/)

src/ulog_events.h

@@ -0,0 +1,85 @@
+#ifndef ULOG_EVENTS_H
+#define ULOG_EVENTS_H
+
+// Per-type event structs for the pre-extracted replay timeline. On WASM these
+// are populated by the ULog extractor at init time and consumed by cursor
+// iteration; on native they are the interchange format between the per-branch
+// decode stage of process_message() and the shared apply helpers.
+//
+// Each struct is laid out for tight packing and 8-byte alignment. The sizes
+// in the comments are the expected sizeof on a 32-bit Emscripten target.
+
+#include <stdint.h>
+#include "ulog_replay.h"   // STATUSTEXT_MSG_MAX, statustext_ring_t (type defs only)
+
+typedef struct {
+    uint64_t timestamp_us;
+    float q[4];                     // w, x, y, z  (direct copy from vehicle_attitude)
+} ulog_att_event_t;                 // 24 bytes
+
+typedef struct {
+    uint64_t timestamp_us;
+    double lat_deg;
+    double lon_deg;
+    float  alt_m;
+    float  _pad;                    // explicit pad keeps sizeof stable on both 32-bit and 64-bit
+} ulog_gpos_event_t;                // 32 bytes
+
+typedef struct {
+    uint64_t timestamp_us;
+    float x, y, z;                  // NED meters
+    float vx, vy, vz;               // NED m/s
+} ulog_lpos_event_t;                // 32 bytes
+
+typedef struct {
+    uint64_t timestamp_us;
+    uint16_t ias_cms;               // indicated_airspeed_m_s * 100
+    uint16_t tas_cms;               // true_airspeed_m_s * 100
+    uint32_t _pad;
+} ulog_aspd_event_t;                // 16 bytes
+
+typedef struct {
+    uint64_t timestamp_us;
+    uint8_t  vehicle_type;          // PX4 enum, pre-translated to MAV_TYPE
+    uint8_t  is_vtol;
+    uint8_t  nav_state;
+    uint8_t  _pad[5];
+} ulog_vstatus_event_t;             // 16 bytes
+
+typedef struct {
+    uint64_t timestamp_us;
+    double   lat_deg;
+    double   lon_deg;
+    float    alt_m;
+    uint8_t  valid_hpos;
+    uint8_t  _pad[3];
+} ulog_home_event_t;                // 32 bytes
+
+typedef struct {
+    uint64_t timestamp_us;
+    uint8_t  severity;              // 0=EMERG .. 7=DEBUG
+    uint8_t  _pad[7];
+    char     text[STATUSTEXT_MSG_MAX];
+} ulog_statustext_event_t;          // 144 bytes
+
+// ---------------------------------------------------------------------------
+// Flat timeline container — one instance per loaded ULog, owned by the WASM
+// replay context. All arrays grow with doubling realloc during extraction and
+// are final-sized (realloc shrink) after the walk completes.
+// ---------------------------------------------------------------------------
+
+typedef struct {
+    ulog_att_event_t        *att;         int att_count;         int att_cap;
+    ulog_lpos_event_t       *lpos;        int lpos_count;        int lpos_cap;
+    ulog_gpos_event_t       *gpos;        int gpos_count;        int gpos_cap;
+    ulog_aspd_event_t       *aspd;        int aspd_count;        int aspd_cap;
+    ulog_vstatus_event_t    *vstatus;     int vstatus_count;     int vstatus_cap;
+    ulog_home_event_t       *home;        int home_count;        int home_cap;
+    ulog_statustext_event_t *statustext;  int statustext_count;  int statustext_cap;
+
+    // Log-level timestamp bounds (microseconds, absolute from log header)
+    uint64_t start_timestamp_us;
+    uint64_t end_timestamp_us;
+} ulog_timeline_t;
+
+#endif