fix(gpu): Use GetTextureAsset() for procedural texture loading

Fixed demo64k crash caused by incorrect manual parsing of procedural
texture headers in effects code.

Problem:
- Procedural textures (NOISE_TEX) have 8-byte header (width, height)
- Effects checked size == 256*256*4 (262,144 bytes)
- Actual size was 262,152 bytes (including header)
- Size mismatch caused texture load failure → WebGPU bind group panic

Solution:
- Use GetTextureAsset() helper that properly parses header
- Returns TextureAsset{width, height, pixels} with pixels pointing after header
- Updated flash_cube_effect.cc and hybrid_3d_effect.cc

Result:
- Demo runs without crashes
- NOISE_TEX loads correctly (256x256 RGBA8)
- No more WebGPU bind group errors

1 files changed, 29 insertions, 33 deletions

diff --git a/src/gpu/effects/hybrid_3d_effect.cc b/src/gpu/effects/hybrid_3d_effect.cc
index 0dbd786..cb77fef 100644
--- a/src/gpu/effects/hybrid_3d_effect.cc
+++ b/src/gpu/effects/hybrid_3d_effect.cc
@@ -33,10 +33,10 @@ void Hybrid3DEffect::init(MainSequence* demo) {
   texture_manager_.init(device_, queue_);
 
   // Load Noise Asset
-  size_t size = 0;
-  const uint8_t* noise_data = GetAsset(AssetId::ASSET_NOISE_TEX, &size);
-  if (noise_data && size == 256 * 256 * 4) {
-    texture_manager_.create_texture("noise", 256, 256, noise_data);
+  TextureAsset noise_tex = GetTextureAsset(AssetId::ASSET_NOISE_TEX);
+  if (noise_tex.pixels && noise_tex.width == 256 && noise_tex.height == 256) {
+    texture_manager_.create_texture("noise", noise_tex.width, noise_tex.height,
+                                    noise_tex.pixels);
     renderer_.set_noise_texture(texture_manager_.get_texture_view("noise"));
   } else {
     std::cerr << "Failed to load NOISE_TEX asset." << std::endl;
@@ -103,39 +103,35 @@ void Hybrid3DEffect::render(WGPURenderPassEncoder pass, float time, float beat,
 
   // Camera jumps every other pattern (2 seconds) for dramatic effect
   int pattern_num = (int)(time / 2.0f);
-  int camera_preset = pattern_num % 4;  // Cycle through 4 different angles
+  int camera_preset = pattern_num % 4; // Cycle through 4 different angles
 
   vec3 cam_pos, cam_target;
 
   switch (camera_preset) {
-    case 0:  // High angle, orbiting
-      {
-        float angle = time * 0.5f;
-        cam_pos = vec3(std::sin(angle) * 12.0f, 8.0f, std::cos(angle) * 12.0f);
-        cam_target = vec3(0, 0, 0);
-      }
-      break;
-    case 1:  // Low angle, close-up
-      {
-        float angle = time * 0.3f + 1.57f;  // Offset angle
-        cam_pos = vec3(std::sin(angle) * 6.0f, 2.0f, std::cos(angle) * 6.0f);
-        cam_target = vec3(0, 1, 0);
-      }
-      break;
-    case 2:  // Side view, sweeping
-      {
-        float sweep = std::sin(time * 0.4f) * 10.0f;
-        cam_pos = vec3(sweep, 5.0f, 8.0f);
-        cam_target = vec3(0, 0, 0);
-      }
-      break;
-    case 3:  // Top-down, rotating
-      {
-        float angle = time * 0.6f;
-        cam_pos = vec3(std::sin(angle) * 5.0f, 12.0f, std::cos(angle) * 5.0f);
-        cam_target = vec3(0, 0, 0);
-      }
-      break;
+  case 0: // High angle, orbiting
+  {
+    float angle = time * 0.5f;
+    cam_pos = vec3(std::sin(angle) * 12.0f, 8.0f, std::cos(angle) * 12.0f);
+    cam_target = vec3(0, 0, 0);
+  } break;
+  case 1: // Low angle, close-up
+  {
+    float angle = time * 0.3f + 1.57f; // Offset angle
+    cam_pos = vec3(std::sin(angle) * 6.0f, 2.0f, std::cos(angle) * 6.0f);
+    cam_target = vec3(0, 1, 0);
+  } break;
+  case 2: // Side view, sweeping
+  {
+    float sweep = std::sin(time * 0.4f) * 10.0f;
+    cam_pos = vec3(sweep, 5.0f, 8.0f);
+    cam_target = vec3(0, 0, 0);
+  } break;
+  case 3: // Top-down, rotating
+  {
+    float angle = time * 0.6f;
+    cam_pos = vec3(std::sin(angle) * 5.0f, 12.0f, std::cos(angle) * 5.0f);
+    cam_target = vec3(0, 0, 0);
+  } break;
   }
 
   camera_.set_look_at(cam_pos, cam_target, vec3(0, 1, 0));