Function floatx4_array_from_astc_img

Source/astcenccli_image.cpp:258–329

See header for documentation. */

/* See header for documentation. */
std::vector<float> floatx4_array_from_astc_img(
	const astcenc_image* img,
	bool y_flip,
	unsigned int z_index
) {
	size_t dim_x = img->dim_x;
	size_t dim_y = img->dim_y;
	std::vector<float> buf(4 * dim_x * dim_y);
	float* buf_data = buf.data();

	assert(z_index < img->dim_z);

	if (img->data_type == ASTCENC_TYPE_U8)
	{
		uint8_t* data8 = static_cast<uint8_t*>(img->data[z_index]);
		for (size_t y = 0; y < dim_y; y++)
		{
			size_t mod_y = y_flip ? dim_y - y - 1 : y;
			float* dst = buf_data + y * dim_x * 4;

			for (size_t x = 0; x < dim_x; x++)
			{
				dst[4 * x    ] = data8[(4 * dim_x * mod_y) + (4 * x    )] * (1.0f / 255.0f);
				dst[4 * x + 1] = data8[(4 * dim_x * mod_y) + (4 * x + 1)] * (1.0f / 255.0f);
				dst[4 * x + 2] = data8[(4 * dim_x * mod_y) + (4 * x + 2)] * (1.0f / 255.0f);
				dst[4 * x + 3] = data8[(4 * dim_x * mod_y) + (4 * x + 3)] * (1.0f / 255.0f);
			}
		}
	}
	else if (img->data_type == ASTCENC_TYPE_F16)
	{
		uint16_t* data16 = static_cast<uint16_t*>(img->data[z_index]);
		for (size_t y = 0; y < dim_y; y++)
		{
			size_t mod_y = y_flip ? dim_y - y - 1 : y;
			float *dst = buf_data + y * dim_x * 4;

			for (size_t x = 0; x < dim_x; x++)
			{
				vint4 colori(
					data16[(4 * dim_x * mod_y) + (4 * x    )],
					data16[(4 * dim_x * mod_y) + (4 * x + 1)],
					data16[(4 * dim_x * mod_y) + (4 * x + 2)],
					data16[(4 * dim_x * mod_y) + (4 * x + 3)]
				);

				vfloat4 color = float16_to_float(colori);
				store(color, dst + 4 * x);
			}
		}
	}
	else // if (img->data_type == ASTCENC_TYPE_F32)
	{
		assert(img->data_type == ASTCENC_TYPE_F32);
		float* data32 = static_cast<float*>(img->data[z_index]);
		for (size_t y = 0; y < dim_y; y++)
		{
			size_t mod_y = y_flip ? dim_y - y - 1 : y;