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, 19 insertions, 0 deletions

diff --git a/src/gpu/effects/passthrough_effect.cc b/src/gpu/effects/passthrough_effect.cc
new file mode 100644
index 0000000..a00f661
--- /dev/null
+++ b/src/gpu/effects/passthrough_effect.cc
@@ -0,0 +1,19 @@
+// This file is part of the 64k demo project.
+// It implements the PassthroughEffect.
+
+#include "gpu/demo_effects.h"
+#include "gpu/gpu.h"
+
+// --- PassthroughEffect ---
+PassthroughEffect::PassthroughEffect(WGPUDevice device,
+                                     WGPUTextureFormat format)
+    : device_(device) {
+  uniforms_ =
+      gpu_create_buffer(device, sizeof(float) * 4,
+                        WGPUBufferUsage_Uniform | WGPUBufferUsage_CopyDst);
+  pipeline_ =
+      create_post_process_pipeline(device, format, passthrough_shader_wgsl);
+}
+void PassthroughEffect::update_bind_group(WGPUTextureView input_view) {
+  pp_update_bind_group(device_, pipeline_, &bind_group_, input_view, uniforms_);
+}