feat(platform): Centralize platform-specific WebGPU code and improve shader composition

1 files changed, 86 insertions, 1 deletions

diff --git a/src/platform/platform.cc b/src/platform/platform.cc
index 29b3af3..2b8529a 100644
--- a/src/platform/platform.cc
+++ b/src/platform/platform.cc
@@ -5,6 +5,7 @@
 #include "platform/platform.h"
 #include "glfw3webgpu.h"
 #include <GLFW/glfw3.h>
+#include <cstdio>
 
 // --- Callbacks ---
 
@@ -128,4 +129,88 @@ WGPUSurface platform_create_wgpu_surface(WGPUInstance instance,
 
 double platform_get_time() {
   return glfwGetTime();
-}
\ No newline at end of file
+}
+
+// --- WebGPU Request Helpers ---
+
+#if defined(DEMO_CROSS_COMPILE_WIN32)
+static void _platform_adapter_cb_win32(WGPURequestAdapterStatus status,
+                                       WGPUAdapter adapter, const char* message,
+                                       void* userdata) {
+  if (status == WGPURequestAdapterStatus_Success) {
+    *((WGPUAdapter*)userdata) = adapter;
+  } else {
+    printf("Request adapter failed: %s\n", message ? message : "Unknown");
+  }
+}
+
+void platform_wgpu_request_adapter(WGPUInstance instance,
+                                   const WGPURequestAdapterOptions* options,
+                                   WGPUAdapter* out_adapter) {
+  wgpuInstanceRequestAdapter(instance, options, _platform_adapter_cb_win32,
+                             out_adapter);
+}
+
+static void _platform_device_cb_win32(WGPURequestDeviceStatus status,
+                                      WGPUDevice device, const char* message,
+                                      void* userdata) {
+  if (status == WGPURequestDeviceStatus_Success) {
+    *((WGPUDevice*)userdata) = device;
+  } else {
+    printf("Request device failed: %s\n", message ? message : "Unknown");
+  }
+}
+
+void platform_wgpu_request_device(WGPUAdapter adapter,
+                                  const WGPUDeviceDescriptor* descriptor,
+                                  WGPUDevice* out_device) {
+  wgpuAdapterRequestDevice(adapter, descriptor, _platform_device_cb_win32,
+                           out_device);
+}
+
+#else
+
+static void _platform_adapter_cb_native(WGPURequestAdapterStatus status,
+                                        WGPUAdapter adapter,
+                                        WGPUStringView message, void* userdata,
+                                        void* userdata2) {
+  (void)userdata2;
+  if (status == WGPURequestAdapterStatus_Success) {
+    *((WGPUAdapter*)userdata) = adapter;
+  } else {
+    printf("Request adapter failed: %.*s\n", (int)message.length, message.data);
+  }
+}
+
+void platform_wgpu_request_adapter(WGPUInstance instance,
+                                   const WGPURequestAdapterOptions* options,
+                                   WGPUAdapter* out_adapter) {
+  WGPURequestAdapterCallbackInfo cb = {};
+  cb.mode = WGPUCallbackMode_WaitAnyOnly;
+  cb.callback = _platform_adapter_cb_native;
+  cb.userdata1 = out_adapter;
+  wgpuInstanceRequestAdapter(instance, options, cb);
+}
+
+static void _platform_device_cb_native(WGPURequestDeviceStatus status,
+                                       WGPUDevice device,
+                                       WGPUStringView message, void* userdata,
+                                       void* userdata2) {
+  (void)userdata2;
+  if (status == WGPURequestDeviceStatus_Success) {
+    *((WGPUDevice*)userdata) = device;
+  } else {
+    printf("Request device failed: %.*s\n", (int)message.length, message.data);
+  }
+}
+
+void platform_wgpu_request_device(WGPUAdapter adapter,
+                                  const WGPUDeviceDescriptor* descriptor,
+                                  WGPUDevice* out_device) {
+  WGPURequestDeviceCallbackInfo cb = {};
+  cb.mode = WGPUCallbackMode_WaitAnyOnly;
+  cb.callback = _platform_device_cb_native;
+  cb.userdata1 = out_device;
+  wgpuAdapterRequestDevice(adapter, descriptor, cb);
+}
+#endif