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feat: add shift factor support #903

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feat: add shift factor support #903

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16 changes: 13 additions & 3 deletions stable-diffusion.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -94,6 +94,7 @@ class StableDiffusionGGML {
std::shared_ptr<RNG> rng = std::make_shared<STDDefaultRNG>();
int n_threads = -1;
float scale_factor = 0.18215f;
float shift_factor = 0.f;

std::shared_ptr<Conditioner> cond_stage_model;
std::shared_ptr<FrozenCLIPVisionEmbedder> clip_vision; // for svd or wan2.1 i2v
Expand Down Expand Up @@ -324,9 +325,10 @@ class StableDiffusionGGML {
scale_factor = 0.13025f;
} else if (sd_version_is_sd3(version)) {
scale_factor = 1.5305f;
shift_factor = 0.0609f;
} else if (sd_version_is_flux(version)) {
scale_factor = 0.3611f;
// TODO: shift_factor
shift_factor = 0.1159f;
} else if (sd_version_is_wan(version) || sd_version_is_qwen_image(version)) {
scale_factor = 1.0f;
}
Expand Down Expand Up @@ -1404,7 +1406,11 @@ class StableDiffusionGGML {
}
}
} else {
ggml_tensor_scale(latent, scale_factor);
ggml_tensor_iter(latent, [&](ggml_tensor* latent, int64_t i0, int64_t i1, int64_t i2, int64_t i3) {
float value = ggml_tensor_get_f32(latent, i0, i1, i2, i3);
value = (value - shift_factor) * scale_factor;
ggml_tensor_set_f32(latent, value, i0, i1, i2, i3);
});
}
}

Expand Down Expand Up @@ -1444,7 +1450,11 @@ class StableDiffusionGGML {
}
}
} else {
ggml_tensor_scale(latent, 1.0f / scale_factor);
ggml_tensor_iter(latent, [&](ggml_tensor* latent, int64_t i0, int64_t i1, int64_t i2, int64_t i3) {
float value = ggml_tensor_get_f32(latent, i0, i1, i2, i3);
value = (value / scale_factor) + shift_factor;
ggml_tensor_set_f32(latent, value, i0, i1, i2, i3);
});
}
}

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