refactor: Store const GpuContext& in Effect base class

- Changed Effect to store ctx_ reference instead of device_/queue_/format_
- Updated all 19 effect implementations to access ctx_.device/queue/format
- Simplified Effect constructor: ctx_(ctx) vs device_(ctx.device), queue_(ctx.queue), format_(ctx.format)
- All 28 tests pass, all targets build successfully

1 files changed, 4 insertions, 4 deletions

diff --git a/src/test_demo.cc b/src/test_demo.cc
index 69b18cc..9635f88 100644
--- a/src/test_demo.cc
+++ b/src/test_demo.cc
@@ -82,13 +82,13 @@ class PeakMeterEffect : public PostProcessEffect {
       }
     )";
 
-    pipeline_ = create_post_process_pipeline(device_, format_, shader_code);
+    pipeline_ = create_post_process_pipeline(ctx_.device, ctx_.format, shader_code);
     uniforms_ = gpu_create_buffer(
-        device_, 16, WGPUBufferUsage_Uniform | WGPUBufferUsage_CopyDst);
+        ctx_.device, 16, WGPUBufferUsage_Uniform | WGPUBufferUsage_CopyDst);
   }
 
   void update_bind_group(WGPUTextureView input_view) {
-    pp_update_bind_group(device_, pipeline_, &bind_group_, input_view, uniforms_);
+    pp_update_bind_group(ctx_.device, pipeline_, &bind_group_, input_view, uniforms_);
   }
 
   void render(WGPURenderPassEncoder pass, float time, float beat,
@@ -98,7 +98,7 @@ class PeakMeterEffect : public PostProcessEffect {
     (void)aspect_ratio;
 
     float uniforms[4] = {peak_value, 0.0f, 0.0f, 0.0f};
-    wgpuQueueWriteBuffer(queue_, uniforms_.buffer, 0, uniforms, sizeof(uniforms));
+    wgpuQueueWriteBuffer(ctx_.queue, uniforms_.buffer, 0, uniforms, sizeof(uniforms));
 
     wgpuRenderPassEncoderSetPipeline(pass, pipeline_);
     wgpuRenderPassEncoderSetBindGroup(pass, 0, bind_group_, 0, nullptr);