DarthAffe/stable-diffusion.cpp
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fix: avoid black images if using an invalid VAE (for SDXL) (#1273)

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akleine 2026-02-19 13:54:18 +01:00 committed by GitHub
parent 636d3cb6ff
commit c5eb1e4137
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1 changed files with 4 additions and 2 deletions
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src/stable-diffusion.cpp
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@ -107,6 +107,7 @@ public:
SDVersion version; SDVersion version;
bool vae_decode_only = false; bool vae_decode_only = false;
bool external_vae_is_invalid = false;
bool free_params_immediately = false; bool free_params_immediately = false;
std::shared_ptr<RNG> rng = std::make_shared<PhiloxRNG>(); std::shared_ptr<RNG> rng = std::make_shared<PhiloxRNG>();
@ -321,6 +322,7 @@ public:
LOG_INFO("loading vae from '%s'", sd_ctx_params->vae_path); LOG_INFO("loading vae from '%s'", sd_ctx_params->vae_path);
if (!model_loader.init_from_file(sd_ctx_params->vae_path, "vae.")) { if (!model_loader.init_from_file(sd_ctx_params->vae_path, "vae.")) {
LOG_WARN("loading vae from '%s' failed", sd_ctx_params->vae_path); LOG_WARN("loading vae from '%s' failed", sd_ctx_params->vae_path);
external_vae_is_invalid = true;
} }
} }
@ -619,10 +621,10 @@ public:
first_stage_model->set_conv2d_direct_enabled(true); first_stage_model->set_conv2d_direct_enabled(true);
} }
if (sd_version_is_sdxl(version) && if (sd_version_is_sdxl(version) &&
(strlen(SAFE_STR(sd_ctx_params->vae_path)) == 0 || sd_ctx_params->force_sdxl_vae_conv_scale)) { (strlen(SAFE_STR(sd_ctx_params->vae_path)) == 0 || sd_ctx_params->force_sdxl_vae_conv_scale || external_vae_is_invalid)) {
float vae_conv_2d_scale = 1.f / 32.f; float vae_conv_2d_scale = 1.f / 32.f;
LOG_WARN( LOG_WARN(
"No VAE specified with --vae or --force-sdxl-vae-conv-scale flag set, " "No valid VAE specified with --vae or --force-sdxl-vae-conv-scale flag set, "
"using Conv2D scale %.3f", "using Conv2D scale %.3f",
vae_conv_2d_scale); vae_conv_2d_scale);
first_stage_model->set_conv2d_scale(vae_conv_2d_scale); first_stage_model->set_conv2d_scale(vae_conv_2d_scale);