4 files changed, 81 insertions, 1 deletions

diff --git a/src/gpu/effect.cc b/src/gpu/effect.cc
index 752dd84..cd4bc16 100644
--- a/src/gpu/effect.cc
+++ b/src/gpu/effect.cc
@@ -14,6 +14,7 @@ Effect::Effect(const GpuContext& ctx, const std::vector<std::string>& inputs,
   FATAL_CHECK(!outputs.empty(), "Effect must have at least one output\n");
   FATAL_CHECK(start_time <= end_time, "Invalid time range: %f > %f\n",
               start_time, end_time);
+  HEADLESS_RETURN_IF_NULL(ctx_.device);
 }
 
 void Effect::dispatch_render(WGPUCommandEncoder encoder,
@@ -55,3 +56,21 @@ void Effect::blit_input_to_output(WGPUCommandEncoder encoder,
   wgpuCommandEncoderCopyTextureToTexture(encoder, &src_copy, &dst_copy,
                                          &extent);
 }
+
+void Effect::init_uniforms_buffer() {
+  uniforms_buffer_.init(ctx_.device);
+}
+
+void Effect::create_linear_sampler() {
+  sampler_ = gpu_create_linear_sampler(ctx_.device);
+}
+
+void Effect::create_nearest_sampler() {
+  sampler_ = gpu_create_nearest_sampler(ctx_.device);
+}
+
+void Effect::create_dummy_scene_texture() {
+  TextureWithView dummy = gpu_create_dummy_scene_texture(ctx_.device);
+  dummy_texture_ = dummy.texture;
+  dummy_texture_view_ = dummy.view;
+}
diff --git a/src/gpu/effect.h b/src/gpu/effect.h
index f5cdf2d..82aa6e1 100644
--- a/src/gpu/effect.h
+++ b/src/gpu/effect.h
@@ -6,6 +6,7 @@
 
 #include "gpu/gpu.h"
 #include "gpu/sequence.h"
+#include "gpu/uniform_helper.h"
 #include <string>
 #include <vector>
 
@@ -51,6 +52,24 @@ class Effect {
   int width_ = 1280;
   int height_ = 720;
 
+  // Common resources for most effects
+  UniformBuffer<UniformsSequenceParams> uniforms_buffer_;
+  WGPUSampler sampler_ = nullptr;
+  WGPUTexture dummy_texture_ = nullptr;
+  WGPUTextureView dummy_texture_view_ = nullptr;
+
+  // Helper: Initialize uniforms buffer (call in subclass constructor)
+  void init_uniforms_buffer();
+
+  // Helper: Create linear sampler (call in subclass constructor)
+  void create_linear_sampler();
+
+  // Helper: Create nearest sampler (call in subclass constructor)
+  void create_nearest_sampler();
+
+  // Helper: Create dummy texture for scene effects (call in subclass constructor)
+  void create_dummy_scene_texture();
+
  private:
   float start_time_;
   float end_time_;
diff --git a/src/gpu/gpu.cc b/src/gpu/gpu.cc
index 2226889..e743bf7 100644
--- a/src/gpu/gpu.cc
+++ b/src/gpu/gpu.cc
@@ -124,6 +124,41 @@ WGPUTextureView gpu_create_texture_view_2d(WGPUTexture texture,
   return wgpuTextureCreateView(texture, &view_desc);
 }
 
+WGPUSampler gpu_create_linear_sampler(WGPUDevice device) {
+  WGPUSamplerDescriptor desc = {};
+  desc.addressModeU = WGPUAddressMode_ClampToEdge;
+  desc.addressModeV = WGPUAddressMode_ClampToEdge;
+  desc.addressModeW = WGPUAddressMode_ClampToEdge;
+  desc.magFilter = WGPUFilterMode_Linear;
+  desc.minFilter = WGPUFilterMode_Linear;
+  desc.mipmapFilter = WGPUMipmapFilterMode_Nearest;
+  desc.maxAnisotropy = 1;
+  return wgpuDeviceCreateSampler(device, &desc);
+}
+
+WGPUSampler gpu_create_nearest_sampler(WGPUDevice device) {
+  WGPUSamplerDescriptor desc = {};
+  desc.addressModeU = WGPUAddressMode_ClampToEdge;
+  desc.addressModeV = WGPUAddressMode_ClampToEdge;
+  desc.magFilter = WGPUFilterMode_Nearest;
+  desc.minFilter = WGPUFilterMode_Nearest;
+  desc.maxAnisotropy = 1;
+  return wgpuDeviceCreateSampler(device, &desc);
+}
+
+TextureWithView gpu_create_dummy_scene_texture(WGPUDevice device) {
+  WGPUTextureDescriptor desc = {};
+  desc.size = {1, 1, 1};
+  desc.format = WGPUTextureFormat_RGBA8Unorm;
+  desc.usage = WGPUTextureUsage_TextureBinding;
+  desc.dimension = WGPUTextureDimension_2D;
+  desc.mipLevelCount = 1;
+  desc.sampleCount = 1;
+  WGPUTexture texture = wgpuDeviceCreateTexture(device, &desc);
+  WGPUTextureView view = wgpuTextureCreateView(texture, nullptr);
+  return {texture, view};
+}
+
 RenderPass gpu_create_render_pass(WGPUDevice device, WGPUTextureFormat format,
                                   const char* shader_code,
                                   ResourceBinding* bindings, int num_bindings) {
diff --git a/src/gpu/gpu.h b/src/gpu/gpu.h
index 9a3fd38..d6c0255 100644
--- a/src/gpu/gpu.h
+++ b/src/gpu/gpu.h
@@ -97,4 +97,11 @@ RenderPass
 gpu_create_render_pass(WGPUDevice device,
                        WGPUTextureFormat format, // Needed for render pipeline
                        const char* shader_code, ResourceBinding* bindings,
-                       int num_bindings);
\ No newline at end of file
+                       int num_bindings);
+
+// Common sampler configurations
+WGPUSampler gpu_create_linear_sampler(WGPUDevice device);
+WGPUSampler gpu_create_nearest_sampler(WGPUDevice device);
+
+// Dummy 1x1 texture for scene effects (don't need texture input)
+TextureWithView gpu_create_dummy_scene_texture(WGPUDevice device);
\ No newline at end of file