2 files changed, 14 insertions, 7 deletions
diff --git a/src/gpu/effects/post_process_helper.cc b/src/gpu/effects/post_process_helper.cc
index db89d77..0a2ac22 100644
--- a/src/gpu/effects/post_process_helper.cc
+++ b/src/gpu/effects/post_process_helper.cc
@@ -1,6 +1,7 @@
 // This file is part of the 64k demo project.
 // It implements helper functions for post-processing effects.
 
+#include "post_process_helper.h"
 #include "../demo_effects.h"
 #include "gpu/gpu.h"
 #include <cstring>
@@ -18,15 +19,15 @@ WGPURenderPipeline create_post_process_pipeline(WGPUDevice device,
       wgpuDeviceCreateShaderModule(device, &shader_desc);
 
   WGPUBindGroupLayoutEntry bgl_entries[3] = {};
-  bgl_entries[0].binding = 0;
+  bgl_entries[0].binding = PP_BINDING_SAMPLER;
   bgl_entries[0].visibility = WGPUShaderStage_Fragment;
   bgl_entries[0].sampler.type = WGPUSamplerBindingType_Filtering;
-  bgl_entries[1].binding = 1;
+  bgl_entries[1].binding = PP_BINDING_TEXTURE;
   bgl_entries[1].visibility = WGPUShaderStage_Fragment;
   bgl_entries[1].texture.sampleType = WGPUTextureSampleType_Float;
   bgl_entries[1].texture.viewDimension = WGPUTextureViewDimension_2D;
-  bgl_entries[2].binding = 2;
-  bgl_entries[2].visibility = WGPUShaderStage_Fragment;
+  bgl_entries[2].binding = PP_BINDING_UNIFORMS;
+  bgl_entries[2].visibility = WGPUShaderStage_Vertex | WGPUShaderStage_Fragment;
   bgl_entries[2].buffer.type = WGPUBufferBindingType_Uniform;
 
   WGPUBindGroupLayoutDescriptor bgl_desc = {};
@@ -74,11 +75,11 @@ void pp_update_bind_group(WGPUDevice device, WGPURenderPipeline pipeline,
   sd.maxAnisotropy = 1;
   WGPUSampler sampler = wgpuDeviceCreateSampler(device, &sd);
   WGPUBindGroupEntry bge[3] = {};
-  bge[0].binding = 0;
+  bge[0].binding = PP_BINDING_SAMPLER;
   bge[0].sampler = sampler;
-  bge[1].binding = 1;
+  bge[1].binding = PP_BINDING_TEXTURE;
   bge[1].textureView = input_view;
-  bge[2].binding = 2;
+  bge[2].binding = PP_BINDING_UNIFORMS;
   bge[2].buffer = uniforms.buffer;
   bge[2].size = uniforms.size;
   WGPUBindGroupDescriptor bgd = {
diff --git a/src/gpu/effects/post_process_helper.h b/src/gpu/effects/post_process_helper.h
index 1986ff3..45757cf 100644
--- a/src/gpu/effects/post_process_helper.h
+++ b/src/gpu/effects/post_process_helper.h
@@ -5,7 +5,13 @@
 
 #include "gpu/gpu.h"
 
+// Standard post-process bind group layout (group 0):
+#define PP_BINDING_SAMPLER 0   // Sampler for input texture
+#define PP_BINDING_TEXTURE 1   // Input texture (previous render pass)
+#define PP_BINDING_UNIFORMS 2  // Custom uniforms buffer
+
 // Helper to create a standard post-processing pipeline
+// Uniforms are accessible to both vertex and fragment shaders
 WGPURenderPipeline create_post_process_pipeline(WGPUDevice device,
                                                 WGPUTextureFormat format,
                                                 const char* shader_code);