test_demo: Add beat-synchronized CNN post-processing with version selection

- Add --cnn-version <1|2> flag to select between CNN v1 and v2
- Implement beat_phase modulation for dynamic blend in both CNN effects
- Fix CNN v2 per-layer uniform buffer sharing (each layer needs own buffer)
- Fix CNN v2 y-axis orientation to match render pass convention
- Add Scene1Effect as base visual layer to test_demo timeline
- Reorganize CNN v2 shaders into cnn_v2/ subdirectory
- Update asset paths and documentation for new shader organization

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/tools/seq_compiler.cc b/tools/seq_compiler.cc
index 069122a..daf1294 100644
--- a/tools/seq_compiler.cc
+++ b/tools/seq_compiler.cc
@@ -1109,6 +1109,21 @@ int main(int argc, char* argv[]) {
                      << ");\n";
             out_file << "    }\n";
           }
+        } else if (!eff.params.empty() && eff.class_name == "CNNv2Effect") {
+          // Generate parameter struct initialization for CNNv2Effect
+          out_file << "    {\n";
+          out_file << "      CNNv2EffectParams p;\n";
+
+          for (const auto& [key, value] : eff.params) {
+            if (key == "blend") {
+              out_file << "      p.blend_amount = " << value << "f;\n";
+            }
+          }
+
+          out_file << "      seq->add_effect(std::make_shared<"
+                   << eff.class_name << ">(ctx, p), " << eff.start << "f, "
+                   << eff.end << "f, " << eff.priority << ");\n";
+          out_file << "    }\n";
         } else {
           // No parameters or unsupported effect - use default constructor
           out_file << "    seq->add_effect(std::make_shared<" << eff.class_name