Seamless texture generation support for qwen image

[Phylliida]

Adds support for qwen image to generate seamless textures, using a -circular flag.

Requires this PR ggml-org/ggml#1374 (Edit: see ggml-org/llama.cpp#16985) for ggml that adds a "circular" mode that can be used.

I also had to tweak rope so the period of the sinusods would evenly tile.

./bin/sd  --diffusion-model /home/bepis/Documents/world/models/qwen-image-lighting-8steps-V1.0-Q4_K_S.gguf  --vae /home/bepis/Documents/world/models/qwen_image_vae.safetensors  --qwen2vl /home/bepis/Documents/world/models/Qwen2.5-VL-7B-Instruct-IQ4_XS.gguf --cfg-scale 2.5 --sampling-method euler -p "onion" --circular --seed 420

[Phylliida]

Some conflicts, lemme resolve those...

[leejet]

Nice Work! Once ggml merges the circular-pad changes, I will merge this PR.

[oscarbg]

llama.cpp PR merged already!

[Phylliida]

Needs to be modified slightly bc you can do it only circular pad no circular conv

[Phylliida]

In particular like this:

__STATIC_INLINE__ struct ggml_tensor* ggml_nn_conv_2d(struct ggml_context* ctx,
                                                      struct ggml_tensor* x,
                                                      struct ggml_tensor* w,
                                                      struct ggml_tensor* b,
                                                      int s0      = 1,
                                                      int s1      = 1,
                                                      int p0      = 0,
                                                      int p1      = 0,
                                                      int d0      = 1,
                                                      int d1      = 1,
                                                      bool direct = false,
                                                      float scale = 1.f) {
    if (scale != 1.f) {
        x = ggml_scale(ctx, x, scale);
    }
    const bool use_circular = sd_is_circular_padding_enabled();
    LOG_DEBUG("use circular conv %d", use_circular ? 1 : 0);
    const bool is_depthwise = (w->ne[2] == 1 && x->ne[2] == w->ne[3]);

    if (use_circular && (p0 != 0 || p1 != 0)) {
        x  = ggml_pad_ext_circular(ctx, x, p0, p0, p1, p1, 0, 0, 0, 0);
        p0 = 0;
        p1 = 0;
    }

    if (direct) {
        if (is_depthwise) {
            x = ggml_conv_2d_dw_direct(ctx, w, x, s0, s1, p0, p1, d0, d1);
        } else {
            x = ggml_conv_2d_direct(ctx, w, x, s0, s1, p0, p1, d0, d1);
        }
    } else {
        x = ggml_conv_2d(ctx, w, x, s0, s1, p0, p1, d0, d1);
    }
    if (scale != 1.f) {
        x = ggml_scale(ctx, x, 1.f / scale);
    }
    if (b != NULL) {
        b = ggml_reshape_4d(ctx, b, 1, 1, b->ne[0], 1);
        x = ggml_add_inplace(ctx, x, b);
    }
    return x;
}

I can clean up this PR to that on monday