refactor(platform): Encapsulate state in PlatformState struct

- Replaced all global static variables in the platform layer with a single PlatformState struct.
- Updated all platform function signatures to accept a pointer to this struct, making the implementation stateless and more modular.
- Refactored main.cc, tests, and tools to instantiate and pass the PlatformState struct.
- This improves code organization and removes scattered global state.

2 files changed, 7 insertions, 7 deletions

diff --git a/src/gpu/gpu.cc b/src/gpu/gpu.cc
index 17d32ee..cecf018 100644
--- a/src/gpu/gpu.cc
+++ b/src/gpu/gpu.cc
@@ -310,9 +310,9 @@ static void handle_request_device(WGPURequestDeviceStatus status,
 #endif /* defined(DEMO_CROSS_COMPILE_WIN32) */
 #endif /* !defined(STRIP_ALL) */
 
-void gpu_init(GLFWwindow* window, int width, int height) {
+void gpu_init(PlatformState* platform_state) {
   g_instance = wgpuCreateInstance(nullptr);
-  g_surface = platform_create_wgpu_surface(g_instance);
+  g_surface = platform_create_wgpu_surface(g_instance, platform_state);
 
   WGPURequestAdapterOptions adapter_opts = {};
   adapter_opts.compatibleSurface = g_surface;
@@ -364,13 +364,13 @@ void gpu_init(GLFWwindow* window, int width, int height) {
   g_config.device = g_device;
   g_config.format = swap_chain_format;
   g_config.usage = WGPUTextureUsage_RenderAttachment;
-  g_config.width = width;
-  g_config.height = height;
+  g_config.width = platform_state->width;
+  g_config.height = platform_state->height;
   g_config.presentMode = WGPUPresentMode_Fifo;
   g_config.alphaMode = WGPUCompositeAlphaMode_Opaque;
   wgpuSurfaceConfigure(g_surface, &g_config);
 
-  g_main_sequence.init(g_device, g_queue, g_config.format, width, height);
+  g_main_sequence.init(g_device, g_queue, g_config.format, platform_state->width, platform_state->height);
 
   LoadTimeline(g_main_sequence, g_device, g_queue, g_config.format);
 }
diff --git a/src/gpu/gpu.h b/src/gpu/gpu.h
index 9ed1913..a0ab6ba 100644
--- a/src/gpu/gpu.h
+++ b/src/gpu/gpu.h
@@ -71,7 +71,7 @@ static inline WGPUStringView label_view(const char* str) {
 
 #endif /* defined(DEMO_CROSS_COMPILE_WIN32) */
 
-struct GLFWwindow;
+struct PlatformState; // Forward declaration
 
 // Basic wrapper for WebGPU buffers
 struct GpuBuffer {
@@ -96,7 +96,7 @@ struct RenderPass {
   uint32_t instance_count;
 };
 
-void gpu_init(GLFWwindow* window, int width, int height);
+void gpu_init(PlatformState* platform_state);
 void gpu_draw(float audio_peak, float aspect_ratio, float time, float beat);
 #if !defined(STRIP_ALL)
 void gpu_simulate_until(float time);