Adapt to wgpu-native Drop methods

Fix include for wgpu-native

backends/imgui_impl_wgpu.cpp

@@ -13,7 +13,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
-//  2023-04-11: Align buffer sizes. Use WGSL shaders instead of precompiled SPIR-V.
+//  2023-04-11: Align buffer sizes. Use WGSL shaders instead of precompiled SPIR-V. Adapt to wgpu-native backend. Define WEBGPU_BACKEND_WGPU when using the wgpu-backend.
 //  2023-04-11: Reorganized backend to pull data from a single structure to facilitate usage with multiple-contexts (all g_XXXX access changed to bd->XXXX).
 //  2023-01-25: Revert automatic pipeline layout generation (see https://github.com/gpuweb/gpuweb/issues/2470)
 //  2022-11-24: Fixed validation error with default depth buffer settings.
@@ -32,6 +32,20 @@
 #include <limits.h>
 #include <webgpu/webgpu.h>
 
+// These differences of implementation should vanish as soon as WebGPU gets in version 1.0 stable
+#ifdef WEBGPU_BACKEND_WGPU
+#include <webgpu/wgpu.h>
+#define wgpuBindGroupLayoutRelease wgpuBindGroupLayoutDrop
+#define wgpuBindGroupRelease wgpuBindGroupDrop
+#define wgpuRenderPipelineRelease wgpuRenderPipelineDrop
+#define wgpuSamplerRelease wgpuSamplerDrop
+#define wgpuShaderModuleRelease wgpuShaderModuleDrop
+#define wgpuTextureViewRelease wgpuTextureViewDrop
+#define wgpuTextureRelease wgpuTextureDrop
+#define wgpuBufferRelease wgpuBufferDrop
+#define wgpuQueueRelease(...)
+#endif // WEBGPU_BACKEND_WGPU
+
 // Dear ImGui prototypes from imgui_internal.h
 extern ImGuiID ImHashData(const void* data_p, size_t data_size, ImU32 seed = 0);
 #define MEMALIGN(_SIZE,_ALIGN)        (((_SIZE) + ((_ALIGN) - 1)) & ~((_ALIGN) - 1))    // Memory align (copied from IM_ALIGN() macro).
@@ -230,7 +244,11 @@ static WGPUProgrammableStageDescriptor ImGui_ImplWGPU_CreateShaderModule(const c
 
     WGPUShaderModuleWGSLDescriptor wgsl_desc = {};
     wgsl_desc.chain.sType = WGPUSType_ShaderModuleWGSLDescriptor;
+#if defined(WEBGPU_BACKEND_WGPU)
+    wgsl_desc.code = wgsl_source;
+#else
     wgsl_desc.source = wgsl_source;
+#endif
 
     WGPUShaderModuleDescriptor desc = {};
     desc.nextInChain = reinterpret_cast<WGPUChainedStruct*>(&wgsl_desc);