fix(build): Resolve Windows cross-compilation failures

This commit fixes several issues that caused the Windows cross-compilation build (`scripts/build_win.sh`) to fail.

The root causes were platform-specific API differences in the wgpu-native library and incorrect dependency tracking in the CMake build system for generated code.

Changes:
- **`tools/seq_compiler.py`**: The timeline generator now wraps `depthSlice` assignments in `#if !defined(DEMO_CROSS_COMPILE_WIN32)` directives to handle API differences in `WGPURenderPassColorAttachment`.
- **`src/gpu/gpu.h`**: The `gpu_init_color_attachment` helper is now platform-aware, using a preprocessor guard for the `depthSlice` member.
- **`src/effects/*.cc`**: All effects are updated to use the new platform-aware helper or have explicit guards for `depthSlice`. Also, replaced `WGPUTexelCopyTextureInfo` with the cross-platform alias `GpuTextureCopyInfo` in `rotating_cube_effect.cc`.
- **`cmake`**: Added `tools/seq_compiler.py` as an explicit dependency to the `generate_timeline` and `generate_test_demo_timeline` custom commands. This ensures that changes to the generator script correctly trigger a rebuild of the generated C++ files.
- **`scripts/build_win.sh`**: Removed the erroneous attempt to build the `seq_compiler.py` script as a native executable.

With these changes, the Windows cross-compilation build now completes successfully.

13 files changed, 23 insertions, 49 deletions

diff --git a/cmake/DemoExecutables.cmake b/cmake/DemoExecutables.cmake
index 223f406..4417eec 100644
--- a/cmake/DemoExecutables.cmake
+++ b/cmake/DemoExecutables.cmake
@@ -55,7 +55,7 @@ add_custom_command(
     COMMAND ${CMAKE_COMMAND} -E make_directory ${CMAKE_CURRENT_SOURCE_DIR}/src/generated
     COMMAND ${Python3_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/tools/seq_compiler.py
             ${TEST_DEMO_SEQ_PATH} --output ${GENERATED_TEST_DEMO_TIMELINE_CC}
-    DEPENDS ${TEST_DEMO_SEQ_PATH} src/gpu/demo_effects.h
+    DEPENDS ${TEST_DEMO_SEQ_PATH} src/gpu/demo_effects.h ${CMAKE_CURRENT_SOURCE_DIR}/tools/seq_compiler.py
     COMMENT "Compiling test_demo sequence..."
 )
 add_custom_target(generate_test_demo_timeline ALL DEPENDS ${GENERATED_TEST_DEMO_TIMELINE_CC})
diff --git a/scripts/build_win.sh b/scripts/build_win.sh
index 915d1e5..c1732f0 100755
--- a/scripts/build_win.sh
+++ b/scripts/build_win.sh
@@ -4,10 +4,9 @@ set -e
 # 1. Build native tools
 echo "Building native tools..."
 cmake -S . -B build_native -DDEMO_BUILD_TOOLS=OFF -DDEMO_BUILD_TESTS=OFF
-cmake --build build_native --target asset_packer seq_compiler tracker_compiler_host -j8
+cmake --build build_native --target asset_packer tracker_compiler_host -j8
 
 ASSET_PACKER_PATH=$(pwd)/build_native/asset_packer
-SEQ_COMPILER_PATH=$(pwd)/build_native/seq_compiler
 TRACKER_COMPILER_PATH=$(pwd)/build_native/tools_host/tracker_compiler_host
 
 echo "Cross-compiling for Windows..."
@@ -16,7 +15,6 @@ cmake -S . -B build_win \
     -DDEMO_CROSS_COMPILE_WIN32=ON \
     -DDEMO_STRIP_ALL=ON \
     -DASSET_PACKER_PATH=$ASSET_PACKER_PATH \
-    -DSEQ_COMPILER_PATH=$SEQ_COMPILER_PATH \
     -DTRACKER_COMPILER_PATH=$TRACKER_COMPILER_PATH
 
 cmake --build build_win -j8
diff --git a/src/effects/flash_effect.cc b/src/effects/flash_effect.cc
index c8638f0..7baf6a2 100644
--- a/src/effects/flash_effect.cc
+++ b/src/effects/flash_effect.cc
@@ -67,11 +67,7 @@ void Flash::render(WGPUCommandEncoder encoder,
 
   // Render pass
   WGPURenderPassColorAttachment color_attachment = {};
-  color_attachment.view = output_view;
-  color_attachment.depthSlice = WGPU_DEPTH_SLICE_UNDEFINED;
-  color_attachment.loadOp = WGPULoadOp_Clear;
-  color_attachment.storeOp = WGPUStoreOp_Store;
-  color_attachment.clearValue = {0.0, 0.0, 0.0, 1.0};
+  gpu_init_color_attachment(color_attachment, output_view);
 
   WGPURenderPassDescriptor pass_desc = {};
   pass_desc.colorAttachmentCount = 1;
diff --git a/src/effects/gaussian_blur_effect.cc b/src/effects/gaussian_blur_effect.cc
index 02cd77e..7304321 100644
--- a/src/effects/gaussian_blur_effect.cc
+++ b/src/effects/gaussian_blur_effect.cc
@@ -68,11 +68,7 @@ void GaussianBlur::render(WGPUCommandEncoder encoder,
 
   // Render pass
   WGPURenderPassColorAttachment color_attachment = {};
-  color_attachment.view = output_view;
-  color_attachment.depthSlice = WGPU_DEPTH_SLICE_UNDEFINED;
-  color_attachment.loadOp = WGPULoadOp_Clear;
-  color_attachment.storeOp = WGPUStoreOp_Store;
-  color_attachment.clearValue = {0.0, 0.0, 0.0, 1.0};
+  gpu_init_color_attachment(color_attachment, output_view);
 
   WGPURenderPassDescriptor pass_desc = {};
   pass_desc.colorAttachmentCount = 1;
diff --git a/src/effects/heptagon_effect.cc b/src/effects/heptagon_effect.cc
index 13d7aad..c472f2f 100644
--- a/src/effects/heptagon_effect.cc
+++ b/src/effects/heptagon_effect.cc
@@ -72,11 +72,7 @@ void Heptagon::render(WGPUCommandEncoder encoder,
 
   // Render pass
   WGPURenderPassColorAttachment color_attachment = {};
-  color_attachment.view = output_view;
-  color_attachment.depthSlice = WGPU_DEPTH_SLICE_UNDEFINED;
-  color_attachment.loadOp = WGPULoadOp_Clear;
-  color_attachment.storeOp = WGPUStoreOp_Store;
-  color_attachment.clearValue = {0.0, 0.0, 0.0, 1.0};
+  gpu_init_color_attachment(color_attachment, output_view);
 
   WGPURenderPassDescriptor pass_desc = {};
   pass_desc.colorAttachmentCount = 1;
diff --git a/src/effects/hybrid3_d_effect.cc b/src/effects/hybrid3_d_effect.cc
index 1dd1c05..5832b57 100644
--- a/src/effects/hybrid3_d_effect.cc
+++ b/src/effects/hybrid3_d_effect.cc
@@ -106,12 +106,7 @@ void Hybrid3D::render(WGPUCommandEncoder encoder,
 
   // Render 3D scene using sequence encoder
   WGPURenderPassColorAttachment color_attachment = {};
-#if !defined(DEMO_CROSS_COMPILE_WIN32)
-  color_attachment.depthSlice = WGPU_DEPTH_SLICE_UNDEFINED;
-#endif
-  color_attachment.view = color_view;
-  color_attachment.loadOp = WGPULoadOp_Clear;
-  color_attachment.storeOp = WGPUStoreOp_Store;
+  gpu_init_color_attachment(color_attachment, color_view);
   color_attachment.clearValue = {0.05f, 0.05f, 0.05f, 1.0f};
 
   WGPURenderPassDepthStencilAttachment depth_attachment = {};
diff --git a/src/effects/particles_effect.cc b/src/effects/particles_effect.cc
index 22e41e9..d83f303 100644
--- a/src/effects/particles_effect.cc
+++ b/src/effects/particles_effect.cc
@@ -84,12 +84,8 @@ void Particles::render(WGPUCommandEncoder encoder,
   // Run render pass (draw particles to output)
   WGPUTextureView output_view = nodes.get_view(output_nodes_[0]);
 
-  WGPURenderPassColorAttachment color_attachment = {
-      .view = output_view,
-      .depthSlice = WGPU_DEPTH_SLICE_UNDEFINED,
-      .loadOp = WGPULoadOp_Clear,
-      .storeOp = WGPUStoreOp_Store,
-      .clearValue = {0.0, 0.0, 0.0, 1.0}};
+  WGPURenderPassColorAttachment color_attachment = {};
+  gpu_init_color_attachment(color_attachment, output_view);
 
   WGPURenderPassDescriptor render_desc = {
       .colorAttachmentCount = 1, .colorAttachments = &color_attachment};
diff --git a/src/effects/passthrough_effect.cc b/src/effects/passthrough_effect.cc
index 392102d..b9d9337 100644
--- a/src/effects/passthrough_effect.cc
+++ b/src/effects/passthrough_effect.cc
@@ -63,12 +63,8 @@ void Passthrough::render(WGPUCommandEncoder encoder,
   bind_group_ = wgpuDeviceCreateBindGroup(ctx_.device, &bg_desc);
 
   // Render pass
-  WGPURenderPassColorAttachment color_attachment = {
-      .view = output_view,
-      .depthSlice = WGPU_DEPTH_SLICE_UNDEFINED,
-      .loadOp = WGPULoadOp_Clear,
-      .storeOp = WGPUStoreOp_Store,
-      .clearValue = {0.0, 0.0, 0.0, 1.0}};
+  WGPURenderPassColorAttachment color_attachment = {};
+  gpu_init_color_attachment(color_attachment, output_view);
 
   WGPURenderPassDescriptor pass_desc = {};
   pass_desc.colorAttachmentCount = 1;
diff --git a/src/effects/peak_meter_effect.cc b/src/effects/peak_meter_effect.cc
index 63be2c0..d823e20 100644
--- a/src/effects/peak_meter_effect.cc
+++ b/src/effects/peak_meter_effect.cc
@@ -81,11 +81,8 @@ void PeakMeter::render(WGPUCommandEncoder encoder,
                        uniforms_buffer_.get(), {nullptr, 0});
 
   WGPURenderPassColorAttachment color_attachment = {};
-  color_attachment.view = output_view;
-  color_attachment.depthSlice = WGPU_DEPTH_SLICE_UNDEFINED;
+  gpu_init_color_attachment(color_attachment, output_view);
   color_attachment.loadOp = WGPULoadOp_Load;
-  color_attachment.storeOp = WGPUStoreOp_Store;
-  color_attachment.clearValue = {0.0, 0.0, 0.0, 1.0};
 
   WGPURenderPassDescriptor pass_desc = {};
   pass_desc.colorAttachmentCount = 1;
diff --git a/src/effects/placeholder_effect.cc b/src/effects/placeholder_effect.cc
index 6ba665a..3367f1c 100644
--- a/src/effects/placeholder_effect.cc
+++ b/src/effects/placeholder_effect.cc
@@ -45,12 +45,8 @@ void Placeholder::render(WGPUCommandEncoder encoder,
   pp_update_bind_group(ctx_.device, pipeline_, &bind_group_, input_view,
                        uniforms_buffer_.get(), {nullptr, 0});
 
-  WGPURenderPassColorAttachment color_attachment = {
-      .view = output_view,
-      .depthSlice = WGPU_DEPTH_SLICE_UNDEFINED,
-      .loadOp = WGPULoadOp_Clear,
-      .storeOp = WGPUStoreOp_Store,
-      .clearValue = {0.0, 0.0, 0.0, 1.0}};
+  WGPURenderPassColorAttachment color_attachment = {};
+  gpu_init_color_attachment(color_attachment, output_view);
 
   WGPURenderPassDescriptor pass_desc = {};
   pass_desc.colorAttachmentCount = 1;
diff --git a/src/effects/rotating_cube_effect.cc b/src/effects/rotating_cube_effect.cc
index 0f1781d..6c350a7 100644
--- a/src/effects/rotating_cube_effect.cc
+++ b/src/effects/rotating_cube_effect.cc
@@ -163,9 +163,9 @@ void RotatingCube::render(WGPUCommandEncoder encoder,
     WGPUTexture input_tex = nodes.get_texture(input_nodes_[0]);
     WGPUTexture output_tex = nodes.get_texture(output_nodes_[0]);
     if (input_tex && output_tex) {
-      WGPUTexelCopyTextureInfo src = {
+      GpuTextureCopyInfo src = {
           .texture = input_tex, .mipLevel = 0, .aspect = WGPUTextureAspect_All};
-      WGPUTexelCopyTextureInfo dst = {.texture = output_tex,
+      GpuTextureCopyInfo dst = {.texture = output_tex,
                                       .mipLevel = 0,
                                       .aspect = WGPUTextureAspect_All};
       WGPUExtent3D copy_size = {(uint32_t)params.resolution.x,
@@ -181,7 +181,9 @@ void RotatingCube::render(WGPUCommandEncoder encoder,
   // Render pass with depth
   WGPURenderPassColorAttachment color_attachment = {
       .view = color_view,
+      #if !defined(DEMO_CROSS_COMPILE_WIN32)
       .depthSlice = WGPU_DEPTH_SLICE_UNDEFINED,
+#endif
       //      .loadOp = WGPULoadOp_Clear,
       .loadOp = WGPULoadOp_Load,
       .storeOp = WGPUStoreOp_Store,
diff --git a/src/gpu/gpu.h b/src/gpu/gpu.h
index 5e928b2..de6c5ba 100644
--- a/src/gpu/gpu.h
+++ b/src/gpu/gpu.h
@@ -66,7 +66,9 @@ inline void gpu_init_color_attachment(WGPURenderPassColorAttachment& attachment,
   attachment.loadOp = WGPULoadOp_Clear;
   attachment.storeOp = WGPUStoreOp_Store;
   attachment.clearValue = {0.0f, 0.0f, 0.0f, 1.0f};
+#if !defined(DEMO_CROSS_COMPILE_WIN32)
   attachment.depthSlice = WGPU_DEPTH_SLICE_UNDEFINED;
+#endif
 }
 
 // Texture creation helper
diff --git a/tools/seq_compiler.py b/tools/seq_compiler.py
index fc07f84..8c92996 100755
--- a/tools/seq_compiler.py
+++ b/tools/seq_compiler.py
@@ -640,7 +640,9 @@ void RenderTimeline(WGPUSurface surface, float time, int width, int height,
     // Clear source
     WGPURenderPassColorAttachment clear_attach = {};
     clear_attach.view = g_source_view;
+    #if !defined(DEMO_CROSS_COMPILE_WIN32)
     clear_attach.depthSlice = WGPU_DEPTH_SLICE_UNDEFINED;
+#endif
     clear_attach.loadOp = WGPULoadOp_Clear;
     clear_attach.storeOp = WGPUStoreOp_Store;
     clear_attach.clearValue = {0.0, 0.0, 0.0, 1.0};
@@ -665,7 +667,9 @@ void RenderTimeline(WGPUSurface surface, float time, int width, int height,
         blit_attach.view = surface_texture.texture
             ? wgpuTextureCreateView(surface_texture.texture, nullptr)
             : nullptr;
+        #if !defined(DEMO_CROSS_COMPILE_WIN32)
         blit_attach.depthSlice = WGPU_DEPTH_SLICE_UNDEFINED;
+#endif
         blit_attach.loadOp = WGPULoadOp_Clear;
         blit_attach.storeOp = WGPUStoreOp_Store;
         blit_attach.clearValue = {0.0, 0.0, 0.0, 1.0};