feat: side-quest - Perlin noise sky and ProcGenFunc error handling

- Updated ProcGenFunc signature to return bool for error reporting.
- Implemented gen_perlin (Fractional Brownian Motion) in procedural/generator.cc.
- Added support for sky texture in Renderer3D and its shader.
- Integrated Perlin noise sky texture in test_3d_render.cc.
- Caught and handled memory/generation errors in AssetManager and TextureManager.
- Assigned reference numbers to all remaining tasks in documentation.

handoff(Gemini): Side-quest complete. ProcGenFunc now returns bool. Perlin noise added and used for sky in 3D test. Windows build remains stable. All tasks numbered.

1 files changed, 16 insertions, 16 deletions

diff --git a/src/3d/renderer.cc b/src/3d/renderer.cc
index cbc3cfa..f190646 100644
--- a/src/3d/renderer.cc
+++ b/src/3d/renderer.cc
@@ -101,13 +101,14 @@ void Renderer3D::create_default_resources() {
 
 void Renderer3D::set_noise_texture(WGPUTextureView noise_view) {
   noise_texture_view_ = noise_view;
-  // Note: Bind group needs recreation if texture changes, but we'll do it in
-  // render for simplicity or just once at init if it's static. For this demo,
-  // let's recreate in render if changed.
+}
+
+void Renderer3D::set_sky_texture(WGPUTextureView sky_view) {
+  sky_texture_view_ = sky_view;
 }
 
 void Renderer3D::create_pipeline() {
-  WGPUBindGroupLayoutEntry entries[4] = {};
+  WGPUBindGroupLayoutEntry entries[5] = {};
   entries[0].binding = 0;
   entries[0].visibility = WGPUShaderStage_Vertex | WGPUShaderStage_Fragment;
   entries[0].buffer.type = WGPUBufferBindingType_Uniform;
@@ -127,8 +128,13 @@ void Renderer3D::create_pipeline() {
   entries[3].visibility = WGPUShaderStage_Fragment;
   entries[3].sampler.type = WGPUSamplerBindingType_Filtering;
 
+  entries[4].binding = 4;
+  entries[4].visibility = WGPUShaderStage_Fragment;
+  entries[4].texture.sampleType = WGPUTextureSampleType_Float;
+  entries[4].texture.viewDimension = WGPUTextureViewDimension_2D;
+
   WGPUBindGroupLayoutDescriptor bgl_desc = {};
-  bgl_desc.entryCount = 4;
+  bgl_desc.entryCount = 5;
   bgl_desc.entries = entries;
   WGPUBindGroupLayout bgl = wgpuDeviceCreateBindGroupLayout(device_, &bgl_desc);
 
@@ -249,34 +255,28 @@ void Renderer3D::draw(WGPURenderPassEncoder pass, const Scene& scene,
   if (bind_group_)
     wgpuBindGroupRelease(bind_group_);
 
-  WGPUBindGroupEntry bg_entries[4] = {};
+  WGPUBindGroupEntry bg_entries[5] = {};
 
   bg_entries[0].binding = 0;
-
   bg_entries[0].buffer = global_uniform_buffer_;
-
   bg_entries[0].size = sizeof(GlobalUniforms);
 
   bg_entries[1].binding = 1;
-
   bg_entries[1].buffer = object_storage_buffer_;
-
   bg_entries[1].size = sizeof(ObjectData) * kMaxObjects;
 
   bg_entries[2].binding = 2;
-
   bg_entries[2].textureView = noise_texture_view_;
 
   bg_entries[3].binding = 3;
-
   bg_entries[3].sampler = default_sampler_;
 
-  WGPUBindGroupDescriptor bg_desc = {};
+  bg_entries[4].binding = 4;
+  bg_entries[4].textureView = sky_texture_view_ ? sky_texture_view_ : noise_texture_view_; // Fallback
 
+  WGPUBindGroupDescriptor bg_desc = {};
   bg_desc.layout = wgpuRenderPipelineGetBindGroupLayout(pipeline_, 0);
-
-  bg_desc.entryCount = 4;
-
+  bg_desc.entryCount = 5;
   bg_desc.entries = bg_entries;
 
   bind_group_ = wgpuDeviceCreateBindGroup(device_, &bg_desc);