feat: ControlNet Union support for SDXL (#2284)

examples/common/common.cpp

@@ -1187,6 +1187,13 @@ ArgOptions SDGenerationParams::get_options() {
          "under --hires-upscalers-dir (default: Latent)",
          0,
          &hires_upscaler},
+        {"",
+         "--control-type",
+         "kind of the control image, one of [openpose, depth, scribble, canny, normal, segment, tile, repaint]. "
+         "Required by an SDXL Control Net Union model (tile and repaint only exist in its ProMax variant), ignored by any other Control Net. "
+         "Also accepted: hed, softedge, pidi, ted (scribble); lineart, anime_lineart, mlsd (canny); seg (segment); inpaint, outpaint (repaint)",
+         0,
+         &control_type},
         {"",
          "--extra-sample-args",
          "extra sampler/scheduler/guidance args, key=value list. CFG supports guidance_schedule; APG supports apg_eta, apg_momentum, apg_norm_threshold, apg_norm_threshold_smoothing; SLG supports slg_uncond; lcm supports noise_clip_std, noise_scale_start, noise_scale_end; flux supports base_shift, max_shift; ltx2 supports max_shift, base_shift, stretch, terminal; euler_ge supports gamma; beta scheduler supports alpha, beta; logit_normal supports mu, std, logsnr_min, logsnr_max, resolution_aware; llada_image supports uniform; lms supports lms_max_order, lms_shift, lms_divisions; noise-injecting samplers support noise_sampler with value iid (default except for dpm++2m_sde_bt) or brownian_tree; brownian_tree_rng supports cpu (default), cuda, std_default or sampler_rng",
@@ -2249,6 +2256,7 @@ bool SDGenerationParams::from_json_str(
 
     load_if_exists("strength", strength);
     load_if_exists("control_strength", control_strength);
+    load_if_exists("control_type", control_type);
     load_if_exists("ip_adapter_strength", ip_adapter_strength);
     load_if_exists("moe_boundary", moe_boundary);
     load_if_exists("vace_strength", vace_strength);
@@ -2638,6 +2646,15 @@ bool SDGenerationParams::resolve(const std::string& lora_model_dir, const std::s
         sample_params.sample_steps = std::clamp(sample_params.sample_steps, 1, 100);
     }
 
+    resolved_control_type = SD_CONTROL_TYPE_NONE;
+    if (!control_type.empty()) {
+        resolved_control_type = str_to_sd_control_type(control_type.c_str());
+        if (resolved_control_type == SD_CONTROL_TYPE_COUNT) {
+            LOG_ERROR("invalid control type '%s' (openpose, depth, scribble, canny, normal, segment, tile, repaint)", control_type.c_str());
+            return false;
+        }
+    }
+
     hires_upscaler_model_path.clear();
     if (hires_enabled) {
         if (hires_upscaler.empty()) {
@@ -2877,6 +2894,7 @@ sd_img_gen_params_t SDGenerationParams::to_sd_img_gen_params_t() {
     params.qwen_image_layers   = qwen_image_layers;
     params.control_image       = control_image.get();
     params.control_strength    = control_strength;
+    params.control_type        = resolved_control_type;
     params.ip_adapter_image    = ip_adapter_image.get();
     params.ip_adapter_strength = ip_adapter_strength;
     params.pm_params           = pm_params;
@@ -3082,6 +3100,7 @@ std::string SDGenerationParams::to_string() const {
         << "  vace_strength: " << vace_strength << ",\n"
         << "  strength: " << strength << ",\n"
         << "  control_strength: " << control_strength << ",\n"
+        << "  control_type: \"" << control_type << "\",\n"
         << "  seed: " << seed << ",\n"
         << "  upscale_repeats: " << upscale_repeats << ",\n"
         << "  upscale_tile_size: " << upscale_tile_size << ",\n"