fix: Resolve shader initialization crashes and build errors

Fixes crashes in demo64k and test_3d_render caused by uninitialized ShaderComposer. Moves InitShaderComposer() call before effect initialization in gpu.cc and adds explicit call in test_3d_render.cc. Also fixes include paths for generated assets.h in multiple files.

2 files changed, 7 insertions, 5 deletions

diff --git a/src/gpu/effects/shaders.h b/src/gpu/effects/shaders.h
index a23c41c..f8e45ba 100644
--- a/src/gpu/effects/shaders.h
+++ b/src/gpu/effects/shaders.h
@@ -1,8 +1,11 @@
 // This file is part of the 64k demo project.
-// It declares the WGSL shader strings.
+// It declares the WGSL shader strings and initialization function.
 
 #pragma once
 
+// Initializes the ShaderComposer with snippet assets.
+void InitShaderComposer();
+
 // Shader declarations (defined in shaders.cc)
 extern const char* main_shader_wgsl;
 extern const char* particle_compute_wgsl;
diff --git a/src/gpu/gpu.cc b/src/gpu/gpu.cc
index 7406113..8342c94 100644
--- a/src/gpu/gpu.cc
+++ b/src/gpu/gpu.cc
@@ -6,6 +6,7 @@
 #include "demo_effects.h"
 #include "effect.h"
 #include "platform.h"
+#include "gpu/effects/shaders.h"
 
 #include <GLFW/glfw3.h>
 #include <math.h>
@@ -52,8 +53,6 @@ static WGPUSurfaceConfiguration g_config = {};
 
 static MainSequence g_main_sequence;
 
-extern void InitShaderComposer();
-
 // --- Helper Functions ---
 
 GpuBuffer gpu_create_buffer(WGPUDevice device, size_t size, uint32_t usage,
@@ -373,11 +372,11 @@ void gpu_init(PlatformState* platform_state) {
   g_config.alphaMode = WGPUCompositeAlphaMode_Opaque;
   wgpuSurfaceConfigure(g_surface, &g_config);
 
+  InitShaderComposer();
+
   g_main_sequence.init(g_device, g_queue, g_config.format,
                        platform_state->width, platform_state->height);
 
-  InitShaderComposer();
-
   LoadTimeline(g_main_sequence, g_device, g_queue, g_config.format);
 }