refactor: Generic sampler system for composites

Replace hardcoded linear_sampler_ with configurable sampler map.
- SamplerType enum (LinearClamp, LinearRepeat, NearestClamp, NearestRepeat)
- get_or_create_sampler() for lazy sampler creation
- Default to LinearClamp for backward compatibility

Eliminates hardcoded assumptions, more flexible for future use cases.

1 files changed, 13 insertions, 3 deletions

diff --git a/src/gpu/texture_manager.h b/src/gpu/texture_manager.h
index 86d1f63..5a2b9f8 100644
--- a/src/gpu/texture_manager.h
+++ b/src/gpu/texture_manager.h
@@ -52,6 +52,13 @@ class TextureManager {
                                const GpuProceduralParams& params);
 
 #if !defined(STRIP_GPU_COMPOSITE)
+  enum class SamplerType {
+    LinearClamp,
+    LinearRepeat,
+    NearestClamp,
+    NearestRepeat
+  };
+
   // GPU composite generation (multi-input textures)
   void create_gpu_composite_texture(const std::string& name,
                                     const std::string& shader_func,
@@ -59,7 +66,8 @@ class TextureManager {
                                     const void* uniform_data,
                                     size_t uniform_size,
                                     int width, int height,
-                                    const std::vector<std::string>& input_names);
+                                    const std::vector<std::string>& input_names,
+                                    SamplerType sampler = SamplerType::LinearClamp);
 #endif
 
 #if !defined(STRIP_ALL)
@@ -91,7 +99,8 @@ class TextureManager {
   void dispatch_composite(const std::string& func_name, WGPUTexture target,
                          const GpuProceduralParams& params,
                          const void* uniform_data, size_t uniform_size,
-                         const std::vector<WGPUTextureView>& input_views);
+                         const std::vector<WGPUTextureView>& input_views,
+                         SamplerType sampler_type);
 #endif
 
   WGPUDevice device_;
@@ -99,6 +108,7 @@ class TextureManager {
   std::map<std::string, GpuTexture> textures_;
   std::map<std::string, ComputePipelineInfo> compute_pipelines_;
 #if !defined(STRIP_GPU_COMPOSITE)
-  WGPUSampler linear_sampler_;
+  WGPUSampler get_or_create_sampler(SamplerType type);
+  std::map<SamplerType, WGPUSampler> samplers_;
 #endif
 };