fix(win): update wgpu-native to v27, unify Windows/macOS API paths

- fetch_win_deps.sh: update wgpu-native v0.19.4.1 → v27.0.4.0 (same as macOS)
- platform.h: remove v0.19 compat shims, Windows now uses WGPUStringView API
- gpu.cc/gpu.h: remove DEMO_CROSS_COMPILE_WIN32 old-API branches
- texture_readback.cc, visual_debug.cc, hybrid3d_effect.cc: same cleanup
- rotating_cube_effect.cc: remove #ifdef guard for depthSlice
- glfw3webgpu.c: remove old WGPUSurfaceDescriptorFromWindowsHWND branch
- asset_manager.cc: fix DEMO_STRIP_ALL→STRIP_ALL guard (vs_main was missing
  in STRIP_ALL Windows builds because disk-loading path ran on embedded data)
- tracker.cc: skip MP3 assets gracefully in STRIP_ALL builds instead of fatal

handoff(Gemini): Windows .exe now runs under Wine. demo64k.exe renders frames
and progresses through audio timeline. Pre-existing test failures unchanged.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 1 insertions, 25 deletions

diff --git a/src/gpu/texture_readback.cc b/src/gpu/texture_readback.cc
index e512428..e7f2729 100644
--- a/src/gpu/texture_readback.cc
+++ b/src/gpu/texture_readback.cc
@@ -71,19 +71,7 @@ std::vector<uint8_t> read_texture_pixels(WGPUInstance instance,
   // Wait for copy to complete before mapping
   wgpuDevicePoll(device, true, nullptr);
 
-  // Map buffer for reading (API differs between Win32 and native)
-#if defined(DEMO_CROSS_COMPILE_WIN32)
-  // Win32: Old callback API
-  MapState map_state = {};
-  auto map_cb = [](WGPUBufferMapAsyncStatus status, void* userdata) {
-    MapState* state = (MapState*)(userdata);
-    state->status = status;
-    state->done = true;
-  };
-  wgpuBufferMapAsync(staging, WGPUMapMode_Read, 0, buffer_size, map_cb,
-                     &map_state);
-#else
-  // Native: New callback info API
+  // Map buffer for reading
   MapState map_state = {};
   auto map_cb = [](WGPUMapAsyncStatus status, WGPUStringView message,
                    void* userdata, void* user2) {
@@ -99,7 +87,6 @@ std::vector<uint8_t> read_texture_pixels(WGPUInstance instance,
   map_info.callback = map_cb;
   map_info.userdata1 = &map_state;
   wgpuBufferMapAsync(staging, WGPUMapMode_Read, 0, buffer_size, map_info);
-#endif
 
   // Wait for mapping to complete (synchronous blocking)
   for (int i = 0; i < 100 && !map_state.done; ++i) {
@@ -221,16 +208,6 @@ std::vector<uint8_t> texture_readback_fp16_to_u8(WGPUDevice device,
   wgpuDevicePoll(device, true, nullptr);
 
   // Map buffer
-#if defined(DEMO_CROSS_COMPILE_WIN32)
-  MapState map_state = {};
-  auto map_cb = [](WGPUBufferMapAsyncStatus status, void* userdata) {
-    MapState* state = (MapState*)(userdata);
-    state->status = status;
-    state->done = true;
-  };
-  wgpuBufferMapAsync(staging, WGPUMapMode_Read, 0, buffer_size, map_cb,
-                     &map_state);
-#else
   MapState map_state = {};
   auto map_cb = [](WGPUMapAsyncStatus status, WGPUStringView message,
                    void* userdata, void* user2) {
@@ -245,7 +222,6 @@ std::vector<uint8_t> texture_readback_fp16_to_u8(WGPUDevice device,
   map_info.callback = map_cb;
   map_info.userdata1 = &map_state;
   wgpuBufferMapAsync(staging, WGPUMapMode_Read, 0, buffer_size, map_info);
-#endif
 
   for (int i = 0; i < 100 && !map_state.done; ++i) {
     wgpuDevicePoll(device, true, nullptr);