Refactor: Split demo effects and shaders into individual files

Split src/gpu/demo_effects.cc into individual .cc files for each effect
and created separate files for post-processing helpers and WGSL shaders.
Updated src/gpu/demo_effects.h to be a central header for all effect-related
declarations and adjusted CMakeLists.txt accordingly.

1 files changed, 16 insertions, 0 deletions

diff --git a/src/gpu/effects/post_process_helper.h b/src/gpu/effects/post_process_helper.h
new file mode 100644
index 0000000..098687b
--- /dev/null
+++ b/src/gpu/effects/post_process_helper.h
@@ -0,0 +1,16 @@
+// This file is part of the 64k demo project.
+// It declares helper functions for post-processing effects.
+
+#pragma once
+
+#include "gpu/gpu.h"
+#include <webgpu.h>
+
+// Helper to create a standard post-processing pipeline
+WGPURenderPipeline create_post_process_pipeline(WGPUDevice device, WGPUTextureFormat format,
+                                                const char* shader_code);
+
+// Helper to update bind group for post-processing effects
+void pp_update_bind_group(WGPUDevice device, WGPURenderPipeline pipeline,
+                          WGPUBindGroup* bind_group, WGPUTextureView input_view,
+                          GpuBuffer uniforms);