Function astcenc_config_init

Source/astcenc_entry.cpp:504–723

See header for documentation. */

/* See header for documentation. */
astcenc_error astcenc_config_init(
	astcenc_profile profile,
	unsigned int block_x,
	unsigned int block_y,
	unsigned int block_z,
	float quality,
	unsigned int flags,
	astcenc_config* configp
) {
	astcenc_error status;

	status = validate_cpu_float();
	if (status != ASTCENC_SUCCESS)
	{
		return status;
	}

	// Zero init all config fields; although most of will be overwritten
	astcenc_config& config = *configp;
	std::memset(&config, 0, sizeof(config));

	// Process the block size
	// For 2D blocks Z==0 is accepted, but convert to 1
	block_z = astc::max(block_z, 1u);
	status = validate_block_size(block_x, block_y, block_z);
	if (status != ASTCENC_SUCCESS)
	{
		return status;
	}

	config.block_x = block_x;
	config.block_y = block_y;
	config.block_z = block_z;

	float texels = static_cast<float>(block_x * block_y * block_z);
	float ltexels = logf(texels) / logf(10.0f);

	// Process the performance quality level or preset; note that this must be done before we
	// process any additional settings, such as color profile and flags, which may replace some of
	// these settings with more use case tuned values
	if (quality < ASTCENC_PRE_FASTEST ||
	    quality > ASTCENC_PRE_EXHAUSTIVE)
	{
		return ASTCENC_ERR_BAD_QUALITY;
	}

	static const std::array<astcenc_preset_config, 6>* preset_configs;
	size_t texels_int = block_x * block_y * block_z;
	if (texels_int < 25)
	{
		preset_configs = &preset_configs_high;
	}
	else if (texels_int < 64)
	{
		preset_configs = &preset_configs_mid;
	}
	else
	{