update wgpu-native to 29.0.0.0 (#4222)

.github/workflows/android-ci.yml

@@ -380,9 +380,6 @@ jobs:
         with:
           toolchain: stable
 
-      - name: Add Android Rust target
-        run: rustup target add ${{ env.RUST_TARGET }}
-
       - name: Configure cargo for Android NDK linker
         run: |
           LATEST_NDK=$(find "$ANDROID_SDK_ROOT/ndk" -mindepth 1 -maxdepth 1 -type d | sort -V | tail -n 1)
@@ -396,6 +393,11 @@ jobs:
       - name: Pre-build wgpu-native for Android
         working-directory: vendor/wgpu-native
         run: |
+          # vendor/wgpu-native pins its own rust toolchain; install targets for that active toolchain
+          ACTIVE_TOOLCHAIN=$(rustup show active-toolchain | awk '{print $1}')
+          rustup target add ${{ env.RUST_TARGET }} --toolchain "$ACTIVE_TOOLCHAIN"
+          rustup target list --toolchain "$ACTIVE_TOOLCHAIN" --installed | grep -x '${{ env.RUST_TARGET }}'
+
           LATEST_NDK=$(find "$ANDROID_SDK_ROOT/ndk" -mindepth 1 -maxdepth 1 -type d | sort -V | tail -n 1)
           NDK_PREBUILT="$LATEST_NDK/toolchains/llvm/prebuilt/linux-x86_64"
           RESOURCE_DIR=$("$NDK_PREBUILT/bin/clang" --print-resource-dir)

.github/workflows/ios-ci.yml

@@ -260,8 +260,13 @@ jobs:
         with:
           toolchain: stable
 
-      - name: Add iOS Rust target
-        run: rustup target add aarch64-apple-ios
+      - name: Ensure iOS Rust targets are installed for active toolchain
+        working-directory: vendor/wgpu-native
+        run: |
+          # vendor/wgpu-native pins its own rust toolchain; install targets for that active toolchain
+          ACTIVE_TOOLCHAIN=$(rustup show active-toolchain | awk '{print $1}')
+          rustup target add aarch64-apple-ios --toolchain "$ACTIVE_TOOLCHAIN"
+          rustup target list --toolchain "$ACTIVE_TOOLCHAIN" --installed | grep -x 'aarch64-apple-ios'
 
       - name: Configure build with CMake
         run: cmake --preset ios-webgpu-wgpu

include/mbgl/webgpu/wgpu_cpp_compat.hpp

@@ -15,7 +15,14 @@
 #include <webgpu/webgpu_cpp.h>
 #elif MLN_WEBGPU_IMPL_WGPU
 // For wgpu-native backend, use the WebGPU-Cpp wrapper
+// TODO: remove this workaround as soon as https://github.com/eliemichel/WebGPU-Cpp/issues/35 is fixed
+#ifndef _NULLABLE
+#define _NULLABLE WGPU_NULLABLE
+#endif
 #include <webgpu.hpp>
+
+#undef _NULLABLE
+
 #endif
 
 #if defined(__clang__)

platform/glfw/glfw_webgpu_backend_impl.ipp

@@ -606,7 +606,7 @@ GLFWWebGPUBackend::GLFWWebGPUBackend(GLFWwindow* window_, bool capFrameRate)
             x11Desc.window = x11Window;
 
             wgpu::SurfaceDescriptor surfaceDesc = {};
-            surfaceDesc.nextInChain = reinterpret_cast<const WGPUChainedStruct*>(&x11Desc);
+            surfaceDesc.nextInChain = reinterpret_cast<WGPUChainedStruct*>(&x11Desc);
 
             wgpuSurface = wgpuInstance.createSurface(surfaceDesc);
 #endif

src/mbgl/webgpu/headless_backend.cpp

@@ -16,9 +16,9 @@ namespace webgpu {
 
 class HeadlessRenderableResource final : public webgpu::RenderableResource {
 public:
-    HeadlessRenderableResource(HeadlessBackend&, webgpu::Context& context_, Size size)
+    HeadlessRenderableResource(HeadlessBackend&, webgpu::Context& context_, Size size_)
         : context(context_),
-          size(size) {
+          size(size_) {
         // Create offscreen texture using the proper WebGPU OffscreenTexture class
         offscreenTexture = context.createOffscreenTexture(size, gfx::TextureChannelDataType::UnsignedByte, true, true);
     }

src/mbgl/webgpu/webgpu_cpp_impl.cpp

@@ -3,4 +3,10 @@
 // for the WebGPU C++ wrapper functions
 
 #define WEBGPU_CPP_IMPLEMENTATION
+// TODO: remove this workaround as soon as https://github.com/eliemichel/WebGPU-Cpp/issues/35 is fixed
+#ifndef _NULLABLE
+#define _NULLABLE WGPU_NULLABLE
+#endif
 #include <webgpu.hpp>
+
+#undef _NULLABLE

vendor/wgpu.cmake

@@ -88,7 +88,23 @@ endmacro()
 
 mln_wgpu_find_library()
 
-if(NOT WGPU_LIBRARY)
+if(NOT WGPU_LIBRARY OR MLN_WGPU_NATIVE_VERSION)
+    # Use a specific version of WGPU. This is required when to a rust application
+    # which uses wgpu directly instead of wgpu-native
+    if (MLN_WGPU_NATIVE_VERSION)
+        execute_process(
+            COMMAND git checkout ${MLN_WGPU_NATIVE_VERSION}
+            WORKING_DIRECTORY ${_mln_wgpu_source_dir}
+            RESULT_VARIABLE _git_checkout_wgpu_result
+            OUTPUT_VARIABLE _git_checkout_wgpu_output
+            ERROR_VARIABLE _git_checkout_wgpu_error
+        )
+
+        if(NOT _git_checkout_wgpu_result EQUAL 0)
+            message(FATAL_ERROR "Failed to checkout wgpu-native version '${MLN_WGPU_NATIVE_VERSION}': ${_git_checkout_wgpu_error}\n")
+        endif()
+    endif()
+
     message(STATUS "Pre-built wgpu-native library not found, attempting to build from source...")
 
     # Check if cargo is available
@@ -147,9 +163,16 @@ else()
     message(STATUS "Found wgpu-native library: ${WGPU_LIBRARY}")
 endif()
 
+# Create compatibility shims for Dawn header paths if they don't exist
+set(_webgpu-cpp-output_dir "${CMAKE_CURRENT_BINARY_DIR}/webgpu-cpp")
+set(_compat_shim_dir "${_webgpu-cpp-output_dir}/webgpu")
+set(_compat_shim_header "${_compat_shim_dir}/webgpu_cpp.h")
+set(_compat_shim_webgpu_h "${_compat_shim_dir}/webgpu.h")
+set(_compat_shim_wgpu_h "${_compat_shim_dir}/wgpu.h")
+file(MAKE_DIRECTORY "${_compat_shim_dir}")
+
 # Generate WebGPU-Cpp wrapper if needed
-set(_webgpu_cpp_dir "${PROJECT_SOURCE_DIR}/vendor/webgpu-cpp")
-set(_webgpu_cpp_header "${_webgpu_cpp_dir}/webgpu.hpp")
+set(_webgpu_cpp_header "${_webgpu-cpp-output_dir}/webgpu.hpp")
 
 if(NOT EXISTS "${_webgpu_cpp_header}")
     message(STATUS "Generating WebGPU-Cpp wrapper...")
@@ -167,7 +190,8 @@ if(NOT EXISTS "${_webgpu_cpp_header}")
         COMMAND ${PYTHON_EXECUTABLE} generate.py
             --use-init-macros
             --header ${_mln_wgpu_source_dir}/ffi/webgpu-headers/webgpu.h
-        WORKING_DIRECTORY ${_webgpu_cpp_dir}
+            --output ${_webgpu_cpp_header}
+        WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}/vendor/webgpu-cpp"
         RESULT_VARIABLE _gen_result
         OUTPUT_VARIABLE _gen_output
         ERROR_VARIABLE _gen_error
@@ -181,15 +205,9 @@ if(NOT EXISTS "${_webgpu_cpp_header}")
     message(STATUS "Successfully generated WebGPU-Cpp wrapper")
 endif()
 
-# Create compatibility shims for Dawn header paths if they don't exist
-set(_compat_shim_dir "${_webgpu_cpp_dir}/wgpu-native/webgpu")
-set(_compat_shim_header "${_compat_shim_dir}/webgpu_cpp.h")
-set(_compat_shim_webgpu_h "${_compat_shim_dir}/webgpu.h")
-
 if(NOT EXISTS "${_compat_shim_header}")
     message(STATUS "Creating WebGPU-Cpp compatibility shim...")
 
-    file(MAKE_DIRECTORY "${_compat_shim_dir}")
     file(WRITE "${_compat_shim_header}"
 "#pragma once
 // Compatibility shim for Dawn header paths
@@ -197,7 +215,13 @@ if(NOT EXISTS "${_compat_shim_header}")
 // for both Dawn and wgpu-native backends
 
 // Include the WebGPU-Cpp wrapper
-#include \"../../webgpu.hpp\"
+// TODO: remove this workaround as soon as https://github.com/eliemichel/WebGPU-Cpp/issues/35 is fixed
+#ifndef _NULLABLE
+    #define _NULLABLE WGPU_NULLABLE
+#endif
+#include \"${_webgpu_cpp_header}\"
+
+#undef _NULLABLE
 ")
 
     message(STATUS "Successfully created WebGPU-Cpp compatibility shim")
@@ -220,7 +244,6 @@ if(NOT EXISTS "${_compat_shim_webgpu_h}")
 endif()
 
 # Also create wgpu.h shim for wgpu-native specific includes
-set(_compat_shim_wgpu_h "${_compat_shim_dir}/wgpu.h")
 if(NOT EXISTS "${_compat_shim_wgpu_h}")
     message(STATUS "Creating wgpu.h compatibility shim...")
 
@@ -245,10 +268,9 @@ target_link_libraries(mbgl-vendor-wgpu INTERFACE ${WGPU_LIBRARY})
 # Add include directories for webgpu.h, wgpu.h, and C++ wrapper
 target_include_directories(mbgl-vendor-wgpu
     SYSTEM INTERFACE
-        ${_webgpu_cpp_dir}                      # For generated webgpu.hpp
-        ${_webgpu_cpp_dir}/wgpu-native          # For webgpu/webgpu_cpp.h compatibility shim
-        ${_mln_wgpu_source_dir}/ffi/webgpu-headers
-        ${_mln_wgpu_source_dir}/ffi
+        ${_webgpu-cpp-output_dir}         # For webgpu.hpp webgpu/webgpu_cpp.h compatibility shim
+        ${_mln_wgpu_source_dir}/ffi/webgpu-headers # webgpu.h
+        ${_mln_wgpu_source_dir}/ffi # wgpu.h
 )
 
 # Platform-specific system libraries that wgpu-native needs