docs+feat(cnn_v3): compact context, re-enable shadow in GBufDeferredEffect

- TODO/PROJECT_CONTEXT updated to reflect operational pipeline state
- GBufDeferredEffect: shadow re-enabled (albedo * (ambient + diffuse * shadow))
  feat_tex1 binding restored for shadow channel debugging

handoff(Gemini): shadow pass live again — investigate why shadow looks broken.

1 files changed, 6 insertions, 1 deletions

diff --git a/cnn_v3/shaders/gbuf_deferred.wgsl b/cnn_v3/shaders/gbuf_deferred.wgsl
index dda4b27..2ed4ce3 100644
--- a/cnn_v3/shaders/gbuf_deferred.wgsl
+++ b/cnn_v3/shaders/gbuf_deferred.wgsl
@@ -5,6 +5,7 @@
 #include "math/normal"
 
 @group(0) @binding(0) var feat_tex0: texture_2d<u32>;
+@group(0) @binding(1) var feat_tex1: texture_2d<u32>;
 @group(0) @binding(2) var<uniform> uniforms: GBufDeferredUniforms;
 
 struct GBufDeferredUniforms {
@@ -39,5 +40,9 @@ fn fs_main(@builtin(position) pos: vec4f) -> @location(0) vec4f {
     let normal  = oct_decode(vec2f(bx.y, ny_d.x));
     let diffuse = max(0.0, dot(normal, KEY_LIGHT));
 
-    return vec4f(albedo * (AMBIENT + diffuse), 1.0);
+    // feat_tex1[2] = pack4x8unorm(mip2.g, mip2.b, shadow, transp)
+    let t1     = textureLoad(feat_tex1, coord, 0);
+    let shadow = unpack4x8unorm(t1.z).z;
+
+    return vec4f(albedo * (AMBIENT + diffuse * shadow), 1.0);
 }