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.

1 files changed, 2 insertions, 2 deletions

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);