Function encode_uastc_hdr

example/example.cpp:178–229

This HDR example function directly uses the basis_compressor_params and basis_compressor classes to compress to a UASTC HDR .KTX2 file. These classes expose all encoder functionality (the C-style wrappers used above don't).

// This HDR example function directly uses the basis_compressor_params and basis_compressor classes to compress to a UASTC HDR .KTX2 file.
// These classes expose all encoder functionality (the C-style wrappers used above don't).
static bool encode_uastc_hdr()
{
	const uint32_t W = 256, H = 256;
	
    imagef img(W, H);

#if 1
    create_mandelbrot(img);
#else
    for (uint32_t y = 0; y < H; y++)
        for (uint32_t x = 0; x < W; x++)
            img(x, y).set(((x ^ y) & 1) ? basist::ASTC_HDR_MAX_VAL : 1000.0f);
#endif

	basis_compressor_params params;
	params.m_hdr = true;
	params.m_source_images_hdr.push_back(img);
	params.m_uastc_hdr_4x4_options.set_quality_level(3);
	params.m_debug = true;
	//params.m_debug_images = true;
	params.m_status_output = true;
	params.m_compute_stats = true;
	params.m_create_ktx2_file = true;
	params.m_write_output_basis_or_ktx2_files = true;
	params.m_out_filename = "test_uastc_hdr.ktx2";
	params.m_perceptual = true;
    
#if 1
    // Create a job pool containing 7 total threads (the calling thread plus 6 additional threads).
    // A job pool must be created, even if threading is disabled.
	const uint32_t NUM_THREADS = 7;
	job_pool jp(NUM_THREADS);
	params.m_pJob_pool = &jp;
	params.m_multithreading = true;
#else
    // No threading
    const uint32_t NUM_THREADS = 1;
    job_pool jp(NUM_THREADS);
    params.m_pJob_pool = &jp;
    params.m_multithreading = false;
#endif

	basis_compressor comp;
	if (!comp.init(params))
		return false;

	basisu::basis_compressor::error_code ec = comp.process();
	if (ec != basisu::basis_compressor::cECSuccess)
		return false;
	
	return true;
}

// This example function loads a .KTX2 file and then transcodes it to various compressed/uncompressed texture formats.
// It writes .DDS and .ASTC files.