feat: Implement 3D system and procedural texture manager

- Extended mini_math.h with mat4 multiplication and affine transforms.
- Implemented TextureManager for runtime procedural texture generation and GPU upload.
- Added 3D system components: Camera, Object, Scene, and Renderer3D.
- Created test_3d_render mini-demo for interactive 3D verification.
- Fixed WebGPU validation errors regarding depthSlice and unimplemented WaitAny.

1 files changed, 10 insertions, 0 deletions

diff --git a/src/gpu/gpu.h b/src/gpu/gpu.h
index 8814cbc..b71e144 100644
--- a/src/gpu/gpu.h
+++ b/src/gpu/gpu.h
@@ -110,6 +110,16 @@ struct ResourceBinding {
                               // WGPUBufferBindingType_Storage
 };
 
+// Cross-platform helper for color attachment initialization
+inline void gpu_init_color_attachment(WGPURenderPassColorAttachment& attachment, WGPUTextureView view) {
+    attachment.view = view;
+    attachment.loadOp = WGPULoadOp_Clear;
+    attachment.storeOp = WGPUStoreOp_Store;
+#if !defined(DEMO_CROSS_COMPILE_WIN32)
+    attachment.depthSlice = WGPU_DEPTH_SLICE_UNDEFINED;
+#endif
+}
+
 GpuBuffer gpu_create_buffer(WGPUDevice device, size_t size, uint32_t usage,
                             const void* data = nullptr);
 ComputePass gpu_create_compute_pass(WGPUDevice device, const char* shader_code,