fix(cnn_v3): frontFace_CW for raster pipeline + sphere impostor in gbuf_raster

- Missing WGPUFrontFace_CW (Y-flipped perspective) caused back faces to
  render instead of front faces → cubes appeared inside-out.
- Sphere objects now use ray-sphere impostor in fs_main: correct silhouette,
  smooth normal from hit point, and reprojected clip-space depth.

1 files changed, 3 insertions, 2 deletions

diff --git a/cnn_v3/src/gbuffer_effect.cc b/cnn_v3/src/gbuffer_effect.cc
index ff78cf8..c49ab88 100644
--- a/cnn_v3/src/gbuffer_effect.cc
+++ b/cnn_v3/src/gbuffer_effect.cc
@@ -552,8 +552,9 @@ void GBufferEffect::create_raster_pipeline() {
   pipe_desc.vertex.entryPoint = str_view("vs_main");
   pipe_desc.fragment = &frag;
   pipe_desc.depthStencil = &ds;
-  pipe_desc.primitive.topology = WGPUPrimitiveTopology_TriangleList;
-  pipe_desc.primitive.cullMode = WGPUCullMode_Back;
+  pipe_desc.primitive.topology  = WGPUPrimitiveTopology_TriangleList;
+  pipe_desc.primitive.cullMode  = WGPUCullMode_Back;
+  pipe_desc.primitive.frontFace = WGPUFrontFace_CW;  // Y-flipped perspective
   pipe_desc.multisample.count = 1;
   pipe_desc.multisample.mask = 0xFFFFFFFF;