Function encode_etc1s

example/example.cpp:102–137

This LDR example function uses the basis_compress() C-style function to compress a ETC1S .KTX2 file.

// This LDR example function uses the basis_compress() C-style function to compress a ETC1S .KTX2 file.
static bool encode_etc1s()
{
    const uint32_t W = 512, H = 512;

    image img(W, H);
    for (uint32_t y = 0; y < H; y++)
        for (uint32_t x = 0; x < W; x++)
            img(x, y).set(0, y >> 1, x >> 1, ((x ^ y) & 1) ? 255 : 0);

    basisu::vector<image> source_images;
    source_images.push_back(img);

    size_t file_size = 0;
    uint32_t quality_level = 255;

    // basis_compress() is a simple wrapper around the basis_compressor_params and basis_compressor classes.
    void* pKTX2_data = basis_compress(
        basist::basis_tex_format::cETC1S,
        source_images,
        quality_level | cFlagSRGB | cFlagGenMipsClamp | cFlagThreaded | cFlagPrintStats | cFlagDebug | cFlagPrintStatus | cFlagUseOpenCL, 0.0f,
        &file_size,
        nullptr);

    if (!pKTX2_data)
        return false;

    if (!write_data_to_file("test_etc1s.ktx2", pKTX2_data, file_size))
    {
        basis_free_data(pKTX2_data);
        return false;
    }

    basis_free_data(pKTX2_data);

    return true;
}

// This LDR example function uses the basis_compress() C-style function to compress a UASTC LDR .KTX2 file.
static bool encode_uastc_ldr()