Fix CUDA initialization error in texture generation for API endpoints

- Added generate_texture() GPU function to properly handle CUDA initialization
- Modified process_generation_job to use GPU function for texture generation
- Resolves 'CUDA must not be initialized in the main process' error
- Enables full texture generation for API endpoints while maintaining compatibility

gradio_app.py

@@ -185,17 +185,18 @@ def process_generation_job(job_id: str, images: Dict[str, str], options: Dict[st
         if should_texture and HAS_TEXTUREGEN:
             try:
                 text_path = os.path.join(save_folder, 'textured_mesh.obj')
-                textured_mesh_path = tex_pipeline(
+                # Use GPU function for texture generation
+                textured_mesh_path = generate_texture(
                     mesh_path=reduced_mesh_path, 
                     image_path=main_image, 
-                    output_mesh_path=text_path, 
-                    save_glb=False
+                    output_mesh_path=text_path
                 )
                 
-                # Convert to GLB
-                glb_path_textured = os.path.join(save_folder, 'textured_mesh.glb')
-                quick_convert_with_obj2gltf(textured_mesh_path, glb_path_textured)
-                textured_mesh_path = glb_path_textured
+                if textured_mesh_path:
+                    # Convert to GLB
+                    glb_path_textured = os.path.join(save_folder, 'textured_mesh.glb')
+                    quick_convert_with_obj2gltf(textured_mesh_path, glb_path_textured)
+                    textured_mesh_path = glb_path_textured
                 
             except Exception as e:
                 logger.error(f"Texture generation failed: {e}")
@@ -630,6 +631,21 @@ def generation_all(
         seed,
     )
 
+@spaces.GPU(duration=60)
+def generate_texture(mesh_path, image_path, output_mesh_path):
+    """Generate texture for a mesh using GPU function."""
+    try:
+        textured_mesh_path = tex_pipeline(
+            mesh_path=mesh_path, 
+            image_path=image_path, 
+            output_mesh_path=output_mesh_path, 
+            save_glb=False
+        )
+        return textured_mesh_path
+    except Exception as e:
+        logger.error(f"Texture generation failed: {e}")
+        return None
+
 @spaces.GPU(duration=60)
 def shape_generation(
     caption=None,