3 files changed, 93 insertions, 0 deletions
diff --git a/src/gpu/demo_effects.h b/src/gpu/demo_effects.h
index ecc37df..a2500e7 100644
--- a/src/gpu/demo_effects.h
+++ b/src/gpu/demo_effects.h
@@ -15,6 +15,7 @@
 #include "gpu/sequence.h"
 #include "gpu/texture_manager.h"
 #include "gpu/uniform_helper.h"
+#include "gpu/wgsl_effect.h"
 
 // Individual Effect Headers
 #include "effects/flash_effect.h"
diff --git a/src/gpu/wgsl_effect.cc b/src/gpu/wgsl_effect.cc
new file mode 100644
index 0000000..0ce4730
--- /dev/null
+++ b/src/gpu/wgsl_effect.cc
@@ -0,0 +1,54 @@
+// WgslEffect: generic shader-only post-process effect.
+
+#include "gpu/wgsl_effect.h"
+#include "gpu/gpu.h"
+#include "gpu/post_process_helper.h"
+#include "util/fatal_error.h"
+
+WgslEffect::WgslEffect(const GpuContext& ctx,
+                       const std::vector<std::string>& inputs,
+                       const std::vector<std::string>& outputs,
+                       float start_time, float end_time,
+                       const char* shader_code, WGPULoadOp load_op,
+                       WgslEffectParams initial_params)
+    : Effect(ctx, inputs, outputs, start_time, end_time),
+      effect_params(initial_params),
+      load_op_(load_op) {
+  HEADLESS_RETURN_IF_NULL(ctx_.device);
+
+  create_linear_sampler();
+  params_buffer_.init(ctx_.device);
+
+  pipeline_.set(create_post_process_pipeline(ctx_.device,
+                                             WGPUTextureFormat_RGBA8Unorm,
+                                             shader_code));
+}
+
+void WgslEffect::render(WGPUCommandEncoder encoder,
+                        const UniformsSequenceParams& params,
+                        NodeRegistry& nodes) {
+  WGPUTextureView input_view = nodes.get_view(input_nodes_[0]);
+  WGPUTextureView output_view = nodes.get_view(output_nodes_[0]);
+
+  params_buffer_.update(ctx_.queue, effect_params);
+
+  pp_update_bind_group(ctx_.device, pipeline_.get(), bind_group_.get_address(),
+                       input_view, uniforms_buffer_.get(),
+                       params_buffer_.get());
+
+  WGPURenderPassColorAttachment color_attachment = {};
+  gpu_init_color_attachment(color_attachment, output_view);
+  color_attachment.loadOp = load_op_;
+
+  WGPURenderPassDescriptor pass_desc = {};
+  pass_desc.colorAttachmentCount = 1;
+  pass_desc.colorAttachments = &color_attachment;
+
+  WGPURenderPassEncoder pass =
+      wgpuCommandEncoderBeginRenderPass(encoder, &pass_desc);
+  wgpuRenderPassEncoderSetPipeline(pass, pipeline_.get());
+  wgpuRenderPassEncoderSetBindGroup(pass, 0, bind_group_.get(), 0, nullptr);
+  wgpuRenderPassEncoderDraw(pass, 3, 1, 0, 0);
+  wgpuRenderPassEncoderEnd(pass);
+  wgpuRenderPassEncoderRelease(pass);
+}
diff --git a/src/gpu/wgsl_effect.h b/src/gpu/wgsl_effect.h
new file mode 100644
index 0000000..062f885
--- /dev/null
+++ b/src/gpu/wgsl_effect.h
@@ -0,0 +1,38 @@
+// WgslEffect: generic shader-only post-process effect.
+// Replaces boilerplate .h/.cc pairs for simple single-pass effects.
+
+#pragma once
+#include "gpu/effect.h"
+#include "gpu/uniform_helper.h"
+#include "gpu/wgpu_resource.h"
+
+// Generic per-effect uniform params (binding 3, 32 bytes).
+// Matches WgslEffectParams in WGSL: struct { p: vec4f, c: vec4f }
+// effect_params.p — 4 generic floats (strength, scale, etc.)
+// effect_params.c — color or secondary vec4
+struct WgslEffectParams {
+  float p[4];  // vec4: generic float params
+  float c[4];  // vec4: color / secondary params
+};
+static_assert(sizeof(WgslEffectParams) == 32, "WgslEffectParams must be 32 bytes");
+
+class WgslEffect : public Effect {
+ public:
+  // Mutate per-frame for dynamic parameter modulation.
+  WgslEffectParams effect_params;
+
+  WgslEffect(const GpuContext& ctx, const std::vector<std::string>& inputs,
+             const std::vector<std::string>& outputs, float start_time,
+             float end_time, const char* shader_code,
+             WGPULoadOp load_op = WGPULoadOp_Clear,
+             WgslEffectParams initial_params = {});
+
+  void render(WGPUCommandEncoder encoder, const UniformsSequenceParams& params,
+              NodeRegistry& nodes) override;
+
+ private:
+  RenderPipeline pipeline_;
+  BindGroup bind_group_;
+  UniformBuffer<WgslEffectParams> params_buffer_;
+  WGPULoadOp load_op_;
+};