1 files changed, 44 insertions, 0 deletions
diff --git a/src/effects/circle_mask_effect.h b/src/effects/circle_mask_effect.h
new file mode 100644
index 0000000..53cc1bc
--- /dev/null
+++ b/src/effects/circle_mask_effect.h
@@ -0,0 +1,44 @@
+// This file is part of the 64k demo project.
+// It defines the CircleMaskEffect class for masking system demonstration.
+// Creates a circular mask and renders green outside the circle.
+
+#ifndef CIRCLE_MASK_EFFECT_H_
+#define CIRCLE_MASK_EFFECT_H_
+
+#include "gpu/effect.h"
+#include "gpu/post_process_helper.h"
+#include "gpu/uniform_helper.h"
+
+class CircleMaskEffect : public Effect {
+ public:
+  CircleMaskEffect(const GpuContext& ctx, float radius = 0.4f);
+  ~CircleMaskEffect() override;
+
+  void init(MainSequence* demo) override;
+  void resize(int width, int height) override;
+  void compute(WGPUCommandEncoder encoder,
+               const CommonPostProcessUniforms& uniforms) override;
+  void render(WGPURenderPassEncoder pass,
+              const CommonPostProcessUniforms& uniforms) override;
+
+ private:
+  struct CircleMaskParams {
+    float radius;
+    float _pad[3];
+  };
+  static_assert(sizeof(CircleMaskParams) == 16,
+                "CircleMaskParams must be 16 bytes for WGSL alignment");
+
+  MainSequence* demo_ = nullptr;
+  float radius_;
+
+  WGPURenderPipeline compute_pipeline_ = nullptr;
+  WGPUBindGroup compute_bind_group_ = nullptr;
+  UniformBuffer<CircleMaskParams> compute_params_;
+
+  WGPURenderPipeline render_pipeline_ = nullptr;
+  WGPUBindGroup render_bind_group_ = nullptr;
+  WGPUSampler mask_sampler_ = nullptr;
+};
+
+#endif /* CIRCLE_MASK_EFFECT_H_ */